Literatura académica sobre el tema "Anode Si"
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Artículos de revistas sobre el tema "Anode Si"
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Han, Renwu. "Si nanomaterials in lithium-ion battery anode". Applied and Computational Engineering 26, n.º 1 (7 de noviembre de 2023): 62–72. http://dx.doi.org/10.54254/2755-2721/26/ojs/20230797.
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Due to its high specific capacity, silicon anode has gained interest on a global scale as the anode of next-generation lithium-ion batteries (LIBs). However, it is challenging for silicon anodes to replace graphite anodes for widespread use due to the inevitable volume expansion and SEI film development generated by silicon during the lithiation/delithiation process. Among these, the advancement of nanotechnology has sped up the development of silicon anodes. This paper reviews nanotechnology applied in the Si anode to improve the battery performance. The volume expansion of Si is effectively decreased by reducing the volume of the silicon anode in order to increase its specific surface area. Additionally, the smaller negative electrode reduces the distance traveled by lithium ions, greatly increasing the silicon negative electrode's efficiency. At present, the main silicon nano-anode materials include nanoparticles, nanowires, nanosheets, nanotubes, nanoporous materials and so on. It is hoped that this review will provide a deep prospect introduction to the nano-silicon anode. Pure silicon nanoparticles and silicon nanowires, and new nanomaterials composed of them with graphite, graphene, metals, etc.
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Han, Renwu. "Si nanomaterials in lithium-ion battery anode". Applied and Computational Engineering 26, n.º 1 (7 de noviembre de 2023): 62–72. http://dx.doi.org/10.54254/2755-2721/26/20230797.
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Due to its high specific capacity, silicon anode has gained interest on a global scale as the anode of next-generation lithium-ion batteries (LIBs). However, it is challenging for silicon anodes to replace graphite anodes for widespread use due to the inevitable volume expansion and SEI film development generated by silicon during the lithiation/delithiation process. Among these, the advancement of nanotechnology has sped up the development of silicon anodes. This paper reviews nanotechnology applied in the Si anode to improve the battery performance. The volume expansion of Si is effectively decreased by reducing the volume of the silicon anode in order to increase its specific surface area. Additionally, the smaller negative electrode reduces the distance traveled by lithium ions, greatly increasing the silicon negative electrode's efficiency. At present, the main silicon nano-anode materials include nanoparticles, nanowires, nanosheets, nanotubes, nanoporous materials and so on. It is hoped that this review will provide a deep prospect introduction to the nano-silicon anode. Pure silicon nanoparticles and silicon nanowires, and new nanomaterials composed of them with graphite, graphene, metals, etc.
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Mondal, Abhishek N., Ryszard Wycisk, John Waugh y Peter N. Pintauro. "Electrospun Si and Si/C Fiber Anodes for Li-Ion Batteries". Batteries 9, n.º 12 (26 de noviembre de 2023): 569. http://dx.doi.org/10.3390/batteries9120569.
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Due to structural changes in silicon during lithiation/delithiation, most Li-ion battery anodes containing silicon show rapid gravimetric capacity fade upon charge/discharge cycling. Herein, we report on a new Si powder anode in the form of electrospun fibers with only poly(acrylic acid) (PAA) binder and no electrically conductive carbon. The performance of this anode was contrasted to a fiber mat composed of Si powder, PAA binder, and a small amount of carbon powder. Fiber mat electrodes were evaluated in half-cells with a Li metal counter/reference electrode. Without the addition of conductive carbon, a stable capacity of about 1500 mAh/g (normalized to the total weight of the anode) was obtained at 1C for 50 charge/discharge cycles when the areal loading of silicon was 0.30 mgSi/cm2, whereas a capacity of 800 mAh/g was obtained when the Si loading was increased to ~1.0 mgSi/cm2. On a Si weight basis, these capacities correspond to >3500 mAh/gSi. The capacities were significantly higher than those found with a slurry-cast powdered Si anode with PAA binder. There was no change in fiber anode performance (gravimetric capacity and constant capacity with cycling) when a small amount of electrically conductive carbon was added to the electrospun fiber anodes when the Si loading was ≤1.0 mgSi/cm2.
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Cao, Xia, Qiuyan Li, Ran Yi, Wu Xu y Ji-Guang Zhang. "Stabilization of Silicon Anode By Advanced Localized High Concentration Electrolytes". ECS Meeting Abstracts MA2022-02, n.º 3 (9 de octubre de 2022): 247. http://dx.doi.org/10.1149/ma2022-023247mtgabs.
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The rapid market penetration of EVs requires batteries with higher energy densities. However, graphite-based lithium-ion batteries (LIBs) has eventually reached their practical limit and an anode with higher specific capacities is required to further improve energy density of LIBs. In this regard, silicon (Si) anode has been pursued as one of the most promising anodes because it exhibits a capacity ten times as high as those of graphite. However, fast capacity fade during cycling and calendar aging limits the practical application of Si-based anodes due to its severe volume changes and continuous side reactions with electrolyte. Therefore, development of electrolytes that are stable with an electrode with large volume expansion is critical to stabilize the Si anode and enable the full potential of the Si based LIBs. In the case of graphite, a stable solid electrolyte interphase (SEI) can be formed on graphite surface because it does not experience large volume change (< 10%), so the SEI can prevent further reactions between graphite and electrolyte once it is formed. In contrast, the SEI layer formed on Si anode must be mechanically strong and withhold large volume changes (>300%). This work reports the design and performance of advanced localized high concentration electrolytes (LHCEs) for Si anode, in which robust SEI forms on the surface of Si anode and protects the Si anode from the pulverization caused by the large volume changes. As a result, the overall performance of the Si based LIBs are greatly improved by using the optimized LHCEs. The electrolytes have been tailored for different applications, including high voltage (4.45 V), high temperature (45°C) and high rate (> 2C) applications. The fundamental understandings of LHCEs and corresponding SEIs developed in this work can guide the design of new electrolytes for other anodes with large volume expansion.
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Lou, Ding, Haiping Hong, Marius Ellingsen y Rob Hrabe. "Supersonic cold-sprayed Si composite alloy as anode for Li-ion batteries". Applied Physics Letters 122, n.º 2 (9 de enero de 2023): 023901. http://dx.doi.org/10.1063/5.0135408.
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The increasing demand for lithium-ion batteries (LIBs) continuously stimulates the research community to seek advanced fabrication of anodes with improved performance and lifespan. Silicon (Si), as one of the most promising anode materials, has been the main focus of both research and industry. In this paper, we report a type of Si alloy anode for LIBs manufactured by the supersonic cold spray technique. The microscopic analysis revealed the uniform morphologies of the anodes, indicating that Si and other metal particles were well bonded. Specific discharge capacities were obtained for the cold-sprayed anodes by half-coin cell tests, with the highest value of 1047 mAh g−1 at a current rate of 0.05 C. Most importantly, the energy-dispersive x-ray spectroscopy results demonstrated none oxidation of the powders after the cold spray process. The results strongly indicate that the concept of using cold spray technique to fabricate Si alloy anode is feasible. Compared to the conventional methods of fabricating Si anodes, the cold spray approach is simple, convenient, and scalable. This method may revolutionarily change the LIBs industries.
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Durmus, Yasin Emre, Christoph Roitzheim, Hermann Tempel, Florian Hausen, Yair Ein-Eli, Hans Kungl y Rüdiger-A. Eichel. "Analysis on discharge behavior and performance of As- and B-doped silicon anodes in non-aqueous Si–air batteries under pulsed discharge operation". Journal of Applied Electrochemistry 50, n.º 1 (2 de diciembre de 2019): 93–109. http://dx.doi.org/10.1007/s10800-019-01372-5.
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Abstract Very high theoretical specific energies and abundant resource availability have emerged interest in primary Si–air batteries during the last decade. When operated with highly doped Si anodes and EMIm(HF)2.3F ionic liquid electrolyte, specific energies up to 1660 Wh kgSi−1 can be realized. Owing to their high-discharge voltage, the most investigated anode materials are $$\langle 100\rangle$$⟨100⟩ oriented highly As-doped Si wafers. As there is substantial OCV corrosion for these anodes, the most favorable mode of operation is continuous discharge. The objective of the present work is, therefore, to investigate the discharge behavior of cells with $$\langle 100\rangle$$⟨100⟩ As-doped Si anodes and to compare their performance to cells with $$\langle 100\rangle$$⟨100⟩ B-doped Si anodes under pulsed discharge conditions with current densities of 0.1 and 0.3 mA cm−2. Nine cells for both anode materials were operated for 200 h each, whereby current pulse time related to total operating time ranging from zero (OCV) to one (continuous discharge), are considered. The corrosion and discharge behavior of the cells were analyzed and anode surface morphologies after discharge were characterized. The performance is evaluated in terms of specific energy, specific capacity, and anode mass conversion efficiency. While for high-current pulse time fractions, the specific energies are higher for cells with As-doped Si anodes, along with low-current pulse fractions the cells with B-doped Si anodes are more favorable. It is demonstrated, that calculations for the specific energy under pulsed discharge conditions based on only two measurements—the OCV and the continuous discharge—match very well with the experimental data. Graphic abstract
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Liu, Xiaoxian, Juan Liu, Xiaoyu Zhao, Dianhong Chai, Nengwen Ding, Qian Zhang y Xiaocheng Li. "Turning Complexity into Simplicity: In Situ Synthesis of High-Performance Si@C Anode in Battery Manufacturing Process by Partially Carbonizing the Slurry of Si Nanoparticles and Dual Polymers". Molecules 29, n.º 1 (28 de diciembre de 2023): 175. http://dx.doi.org/10.3390/molecules29010175.
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For Si/C anodes, achieving excellent performance with a simple fabrication process is still an ongoing challenge. Herein, we report a green, facile and scalable approach for the in situ synthesis of Si@C anodes during the electrode manufacturing process by partially carbonizing Si nanoparticles (Si NPs) and dual polymers at a relatively low temperature. Due to the proper mass ratio of the two polymer precursors and proper carbonization temperature, the resultant Si-based anode demonstrates a typical Si@C core–shell structure and has strong mechanical properties with the aid of dual-interfacial bonding between the Si NPs core and carbon shell layer, as well as between the C matrix and the underlying Cu foil. Consequently, the resultant Si@C anode shows a high specific capacity (3458.1 mAh g−1 at 0.2 A g−1), good rate capability (1039 mAh g−1 at 4 A g−1) and excellent cyclability (77.94% of capacity retention at a high current density of 1 A g−1 after 200 cycles). More importantly, the synthesis of the Si@C anode is integrated in situ into the electrode manufacturing process and, thus, significantly decreases the cost of the lithium-ion battery but without sacrificing the electrochemical performance of the Si@C anode. Our results provide a new strategy for designing next-generation, high-capacity and cost-effective batteries.
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Wang, Jingbo, Li Cao, Songyuan Li, Jiejie Xu, Rongshi Xiao y Ting Huang. "Effect of Laser-Textured Cu Foil with Deep Ablation on Si Anode Performance in Li-Ion Batteries". Nanomaterials 13, n.º 18 (11 de septiembre de 2023): 2534. http://dx.doi.org/10.3390/nano13182534.
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Si is a highly promising anode material due to its superior theoretical capacity of up to 3579 mAh/g. However, it is worth noting that Si anodes experience significant volume expansion (>300%) during charging and discharging. Due to the weak adhesion between the anode coating and the smooth Cu foil current collector, the volume-expanded Si anode easily peels off, thus damaging anode cycling performance. In the present study, a femtosecond laser with a wavelength of 515 nm is used to texture Cu foils with a hierarchical microstructure and nanostructure. The peeling and cracking phenomenon in the Si anode are successfully reduced, demonstrating that volume expansion is effectively mitigated, which is attributed to the high specific surface area of the nanostructure and the protection of the deep-ablated microgrooves. Moreover, the hierarchical structure reduces interfacial resistance to promote electron transfer. The Si anode achieves improved cycling stability and rate capability, and the influence of structural features on the aforementioned performance is studied. The Si anode on the 20 μm-thick Cu current collector with a groove density of 75% and a depth of 15 μm exhibits a capacity of 1182 mAh/g after 300 cycles at 1 C and shows a high-rate capacity of 684 mAh/g at 3 C.
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Kumar, Kuldeep, Ian L. Matts, Andrei Klementov, Scott Sisco, Dennis A. Simpson, Edward R. Millero, Kareem Kaleem, Gina M. Terrago y Se Ryeon Lee. "Improving Fundamental Understanding of Si-Based Anodes Using Carboxymethyl Cellulose (CMC) and Styrene-Butadiene Rubber (SBR) Binder for High Energy Lithium Ion Battery Applications". ECS Meeting Abstracts MA2022-01, n.º 2 (7 de julio de 2022): 420. http://dx.doi.org/10.1149/ma2022-012420mtgabs.
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With increasing demand of high energy density lithium ion batteries, silicon (Si) based anodes are an obvious substitute of graphite based systems due to their high capacity. However, large volume changes of Si during lithiation and delithiation processes causes pulverization of silicon particles. The resulting reduction in electrical continuity and solid electrolyte interphase (SEI) growth within the anode leads to a fast depletion of lithium reservoirs and an accelerates battery failure. High energy lithium ion battery applications such as electrical vehicles and electronic devices require high capacity retention over extended cycling, so improving performance of Si-based anodes is a critical need for many applications. Commonly, a combination of sodium carboxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR) is used as a binder for waterborne Si anode slurries. In these systems, carboxyl (-COOH) groups on CMC form chemical bonding with hydroxyl (-OH) groups on Si active material surface and SBR addition provides enhanced flexibility in the anode layer. Several reports on electrode integrity improvement through adhesion promoters, increased crosslinking, different binding groups, etc. are available in the literature. Delving deeper into the weak mechanical integrity of Si based anodes, and understanding the parameters influencing the fabrication process and subsequent properties, is important. This presentation will focus on several variations in Si based anode slurries and electrodes using CMC-SBR binders. Physical, mechanical, and electrochemical properties are extensively studied as a function of these parameters and will be discussed.
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Flügel, Marius, Marius Bolsinger, Mario Marinaro, Volker Knoblauch, Markus Hölzle, Margret Wohlfahrt-Mehrens y Thomas Waldmann. "Onset Shift of Li Plating on Si/Graphite Anodes with Increasing Si Content". Journal of The Electrochemical Society 170, n.º 6 (1 de junio de 2023): 060536. http://dx.doi.org/10.1149/1945-7111/acdda3.
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Mixing graphite with Si particles in anodes of Li-ion batteries provides increased specific energy. In addition, higher Si contents lead to thinner anode coatings at constant areal capacity. In the present study, we systematically investigated the influence of the Si content on the susceptibility of Li plating on Si/graphite anodes. Si/graphite anodes with Si contents from 0 to 20.8 wt% combined with NMC622 cathodes were manufactured on pilot-scale. After initial characterization in coin half cells and by SEM, pouch full cells with fixed N/P ratios were built. Rate capability at different temperatures, and Post-Mortem analysis were carried out. Results from voltage relaxation, Li stripping, SEM measurements, glow discharge optical emission spectroscopy (GD-OES) depth profiling, and optical microscopy were validated against each other. A decreasing susceptibility to Li plating with increasing Si content in the anodes could be clearly observed. A critical C-rate was defined, at which Li plating was detected for the first time. It was also found that at 0 °C the critical C-rate increases with increasing Si contents. At 23 °C the SOC at which Li dendrites were first observed on the anode also increased with higher Si content.
Tesis sobre el tema "Anode Si"
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Cen, Yinjie. "Si/C Nanocomposites for Li-ion Battery Anode". Digital WPI, 2017. https://digitalcommons.wpi.edu/etd-dissertations/468.
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The demand for high performance Lithium-ion batteries (LIBs) is increasing due to widespread use of portable devices and electric vehicles. Silicon (Si) is one of the most attractive candidate anode materials for the next generation LIBs because of its high theoretical capacity (3,578 mAh/g) and low operation potential (~0.4 V vs Li+/Li). However, the high volume change (>300%) during Lithium ion insertion/extraction leads to poor cycle life. The goal of this work is to improve the electrochemical performance of Si/C composite anode in LIBs. Two strategies have been employed: to explore spatial arrangement in micro-sized Si and to use Si/graphene nanocomposites. A unique branched microsized Si with carbon coating was made and demonstrated promising electrochemical performance with a high active material loading ratio of 2 mg/cm2, large initial discharge capacity of 3,153 mAh/g and good capacity retention of 1,133 mAh/g at the 100th cycle at 1/4C current rate. Exploring the spatial structure of microsized Si with its advantages of low cost, easy dispersion, and immediate compatibility with the prevailing electrode manufacturing technology, may indicate a practical approach for high energy density, large-scale Si anode manufacturing. For Si/Graphene nanocomposites, the impact of particle size, surface treatment and graphene quality were investigated. It was found that the electrochemical performance of Si/Graphene anode was improved by surface treatment and use of graphene with large surface area and high defect density. The 100 nm Si/Graphene nanocomposites presented the initial capacity of 2,737 mAh/g and good cycling performance with a capacity of 1,563 mAh/g after 100 cycles at 1/2C current rate. The findings provided helpful insights for design of different types of graphene nanocomposite anodes.
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Deng, Haokun. "Nanostructured Si and Sn-Based Anodes for Lithium-Ion Batteries". Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/612405.
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Lithium-ion batteries (LIBs) are receiving significant attention from both academia and industry as one of the most promising energy storage and conservation devices due to their high energy density and excellent safety. Graphite, the most widely used anode material, with limitations on energy density, can no longer satisfy the requirements proposed by new applications. Therefore, further improvement on the electrochemical performance of anodes has been long pursued, along with the development of new anode materials. Among potential candidates, Si and Sn based anodes are believed to be the most promising. However, the dramatic volume expansion upon Li-intercalation and contraction upon Li de-intercalation cause mechanical instability, and thus cracking of the electrodes. To overcome this issue, many strategies have been explored. Among them the most efficient strategies include introduction of a nanostructure, coupled with a buffering matrix and coating with a protective film. However, although cycling life has been significantly increased using these three strategies, the capacity retention still needs improvement, especially over extensive charge-discharge cycles. In addition, more efforts are still needed to develop new fabrication methods with low costs and high efficiency. To further improve mechanical stability of electrodes, understanding of the failure mechanisms, particularly, the failure mechanisms of Si and Sn nanomaterials is essential. Therefore, some of the key factors including materials fabrication and microstructural changes during cycling are studied in this work. Hollow Si nanospheres have proved to be have a superior electrochemical performance when applied as anode materials. However, most of fabrication methods either involve use of processing methods with low throughput, or expensive temporary templates, which severely prohibits large-scale use of hollow Si spheres. This work designed a new template-free chemical synthesis method with high throughput and simple procedures to fabricate Si hollow spheres with a nanoporous surface. The characterization results showed good crystallinity and a uniform hollow sphere structure. The substructure of pores on the surface provides pathways for electrolyte diffusion and can alleviate the damage by the volume expansion during lithiation. The success of this synthesis method provides valuable inspiration for developing industrial manufacturing method of hollow Si spheres.3D graphene is the most promising matrix that can provide the necessary mechanical support to Sn and Si nanoparticles during lithiation. 2D graphene, however, results in Sn/graphene nanocomposites with a continuous capacity fade during cycling. It is anticipated that this is due to microstructural changes of Sn, however, no studies have been performed to examine the morphology of such cycled anodes. Hence, a new Sn/2D graphene nanocomposite was fabricated via a simple chemical synthesis, in which Sn nanoparticles (20-200 nm) were attached onto the graphene surface. The content of Sn was 10 wt.% and 20 wt.%. These nanopowders were cycled against pure Li-metal and, as in previous studies, a significant capacity decrease occurred during the first several cycles. Transmission and scanning electron microscopy revealed that during long term cycling electrochemical coarsening took place, which resulted in an increased Sn particle size of over 200 nm, which could form clusters that were 1 m. Such clusters result in a poor electrochemical performance since it is difficult for complete lithiation of the Sn to occur. It is hence concluded that the inability of Sn/2D graphene anodes to retain high capacities is due to coarsening that occurs during cycling. In addition to using forms of carbon to buffer the Sn expansion, it has been proposed to alloy Sn with S, which has a low redox potential vs Li⁰/Li⁺. Therefore, another new anode proposed here is that of SnS attached to graphite. The as prepared powders had a flower-like structure of the SnS alloy. Electrochemical cycling and subsequent microstructural analysis showed that after electrochemical cycling this pattern was destroyed and replaced by Sn and SnS nanoparticles. Based on the electron microscopy and XRD analysis, it was concluded that selective leaching of S occurs during lithiation of SnS particles, which results into nano SnS and Sn particles to be distributed throughout the electrolyte or SEI layer, without being able to take part in the electrochemical reactions. This mechanism has not been noted before for SnS anodes and indicates that it may not be possible to retain the initial morphology of SnS alloy during cycling, or the ability of SnS to be active throughout long term cycling. To conclude it should be stated that the goal and novelty of this thesis was (i) the fabrication of new Si, Sn/graphene and SnS/C nanostructures that can be used as anodes in Li-ion batteries and (ii) the documentation of the mechanisms that disrupt the initial structural stability of Sn/2D graphene and SnS/C anodes and result in severe capacity loss during long term cycling (over 100 cycles). These systems are of high interest to the electrochemistry community and battery developers.
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Sun, Xida. "Structured Silicon Macropore as Anode in Lithium Ion Batteries". Wright State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=wright1316470033.
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Trevisan, Henrique. "Structure and functionality of sequence-controlled copolymers in aqueous dispersion and Li-ion anode composites". Electronic Thesis or Diss., Université Paris sciences et lettres, 2022. http://www.theses.fr/2022UPSLS018.
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La sélection de couples de monomères, assurant des rapports de réactivité proches de zéro est une stratégie efficace pour induire une copolymérisation spontanée selon une séquence alternée. La conception de monomères et le réglage des interactions solvant-monomère ouvrent la voie à des copolymères fonctionnels présentant un auto-assemblage moléculaire en relation avec leur structure amphipathique régulière. Dans ce travail, nous analysons les relations existantes entre la structure primaire de copolymères et leur fonctionnalité, dans le domaine colloïdal et dans la formulation de composites pour la partie anodique de batteries Li-ion.Tout d'abord, est rapportée la formation spontanée de nanoparticules par des interactions solvant/non-solvant en utilisant la méthode de basculement de solvant encore appelée ''effet ouzo''. Ainsi, la partie du diagramme ternaire décrivant l'effet ouzo a été construite pour déterminer la fenêtre d'opération via l'auto-assemblage, dans des suspensions aqueuses, de copolymères alternés constitués d'unités vinylphénol et maléimide portant de longs groupes alkyl-pendants (C12H25 ou C18H37). La taille et la structure des nanoparticules se sont avérées être déterminées par au moins trois facteurs : la balance lipo/hydrophilie du copolymère, l'affinité solvant/eau et la diffusivité du solvant qui interviennent pendant le processus de basculement de solvant. Dans l'ensemble, nous présentons ici l'effet ouzo spontané comme une méthode simple pour produire des nanoparticules de copolymères alternés stables dans l'eau sans l'ajout d'agents stabilisants.Ensuite, est abordé dans ce travail le lien entre la structure et fonctionnalité des copolymères et le fonctionnement en tant que liant dans des anodes de Si. Le silicium s'avère prometteur en tant que matériau anodique dans les batteries Li-ion (LIBs) en raison de sa capacité de stockage exceptionnelle par formation d'alliages. Néanmoins, les matériaux d'anode à base de Si ont tendance à s'effondrer rapidement au cyclage et c'est un défi majeur dans lequel la conception de nouveaux polymères pourrait apporter des solutions. Dans ce travail, nous avons examiné les performances en tant que liant de copolymères statistiques ou alternés comportant des motifs phénoliques, l'idée étant que la liaison hydrogène pourrait jouer un rôle. Nous montrons que le greffage de groupes catéchol sur une structure PAA selon un ordre aléatoire est une stratégie très efficace pour améliorer la performance électrochimique des composites anodiques à base de nano-/microparticules de Si. Finalement, des copolymères à séquence contrôlée comportant plus ou moins d'unités vinylphénol ont été expérimentés comme liants d'électrodes de Si. L'analyse du cyclage met en évidence un lien, cette fois-ci négatif, entre la structuration mésoscopique (lié à fonctionnalité du copolymère) et le fonctionnement en tant que liant d'anodes de Si. En effet, la présence d'unités phénoliques induit un auto-assemblage du copolymère sous forme de micelles vermiculaires qui se maintient à l'intérieur du composite d'anode, conduisant à une structure hiérarchique, finalement préjudiciable à la longévité de l'anode et à l'accommodation des changements de volume de SiThe selection of monomer couples, ensuring reactivity ratios close to zero is an effective strategy to induce spontaneous copolymerization in an alternating sequence. The design of monomers and the customisation of solvent-monomer interactions open the way to functional copolymers exhibiting molecular self-assembly in relation to their regular amphipathic structure. In this work, we analyse the existing relationships between the primary structure of copolymers and their functionality, in the colloidal domain and in the formulation of composites for the anode part of Li-ion batteries.First, the spontaneous formation of nanoparticles by solvent/non-solvent interactions is reported using the solvent-shifting method, also called as "ouzo effect". Thus, the part of the ternary diagram describing the ouzo effect was constructed to determine the window of operation via the self-assembly, in aqueous suspensions, of alternating copolymers consisting of vinylphenol and maleimide units bearing long alkyl-pendant groups (C12H25 or C18H37). The size and structure of the nanoparticles were found to be determined by at least three factors: the lipo/hydrophilic balance of the copolymer, the solvent/water affinity, and the solvent diffusivity involved during the solvent-shifting process. Overall, we present here the spontaneous ouzo effect as a simple method to produce stable alternating copolymer nanoparticles in aqueous dispersion without the addition of stabilizing agents.Next, the link between the structure and functionality of the copolymers and their function as a binder in Si anodes is addressed in this work. Silicon enlightens its promise as anode material in Li-ion batteries (LIBs) due to its exceptional storage capacity through alloy formation. Nevertheless, Si-based anode materials tend to collapse rapidly upon cycling, and this is a major challenge in which the design of new polymers could provide solutions. In this work, we have examined the performance as a binder of random or alternating copolymers with phenolic units, the idea being that hydrogen bonding might play a role. We show that grafting catechol groups onto a PAA structure in a random order is an effective strategy to improve the electrochemical performance of Si nano-/micro particle based anode composites. Finally, sequence-controlled copolymers with more or less vinyl phenol units were tested as Si electrode binders. Cycling analysis shows a link, negative this time, between the mesoscopic structuring (linked to the functionality of the copolymer) and the role as Si anode binder. Indeed, the presence of phenolic units induces a self-assembly of the copolymer in the form of vermicular micelles which is maintained inside the anode composite, leading to a hierarchical structure, which is detrimental to the longevity of the anode and to the accommodation of Si volume changes
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Yoon, Dong-hwan [Verfasser]. "Analysis of aging behavior of Si alloy-based anode in lithium-ion batteries / Dong-hwan Yoon". Ulm : Universität Ulm, 2020. http://d-nb.info/1219577723/34.
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Fan, Jui Chin. "The Performance of Structured High-Capacity Si Anodes for Lithium-Ion Batteries". BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5467.
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This study sought to improve the performance of Si-based anodes through the use of hierarchically structured electrodes to provide the nanoscale framework needed to accommodate large volume changes while controlling the interfacial area – which affects solid-electrolyte interphase (SEI) formation. To accomplish this, electrodes were fabricated from vertically aligned carbon nanotubes (VACNT) infiltrated with silicon. On the nanoscale, these electrodes allowed us to adjust the surface area, tube diameter, and silicon layer thickness. On the micro-scale, we have the ability to control the electrode thickness and the incorporation of micro-sized features. Treatment of the interfacial area between the electrolyte and the electrode by encapsulating the electrode controls the stabilization and reduction of unstable SEI. Si-VACNT composite electrodes were prepared by first synthesizing VACNTs on Si wafers using photolithography for catalyst patterning, followed by aligned CNT growth. Nano-layers of silicon were then deposited on the aligned carbon nanotubes via LPCVD at 200mTorr and 535°C. A thin copper film was used as the current collector. Electrochemical testing was performed on the electrodes assembled in a CR2025 coin cell with a metallic Li foil as the counter electrode. The impact of the electrode structure on the capacity at various current densities was investigated. Experimental results demonstrated the importance of control over the superficial area between the electrolyte and the electrode on the performance of silicon-based electrodes for next generation lithium ion batteries. In addition, the results show that Si-VACNT height does not limit Li transport for the range of the conditions tested.
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Fan, Jui Chin. "The Impact of Nanostructured Templates and Additives on the Performance of Si Electrodes and Solid Polymer Electrolytes for Advanced Battery Applications". BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7568.
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The primary objectives of this research are: (1) use a hierarchical structure to study electrode materials for next-generation lithium-ion batteries (LIBs) and (2) understand the fundamentals and utility of solid polymer electrolytes (SPEs) with the addition of halloysite nanotubes (HNTs) for battery applications. Understanding the fundamental principles of electrode and electrolyte materials allows for the development of high-performance LIBs. The contributions of this dissertation are described below. Encapsulated Si-VACNT Electrodes. Two hurdles prevent Si-based electrodes from mass production. First, bulk Si undergoes volume expansion up to 300%. Second, a solid-electrolyte interphase (SEI) forms between the interface of the electrolyte and electrode, which consumes battery capacity and creates more resistance at the interface. Si volume changes were overcome by depositing silicon on vertically-aligned carbon nanotubes (VACNTs). Encapsulating the entire Si-VACNT electrode surface with carbon was used to mitigate SEI formation. Although SEI formation was reduced by the encapsulation layer, capacity fade was still observed for encapsulated electrodes, indicating that SEI formation was not the primary factor affecting capacity fade. Additionally, the impact of the encapsulation layer on Li transport was examined. Two different transport directions and length scales were relevant””(1) radial transport of Li in/out of each Si-coated nanotube (~40 nm diameter) and (2) Li transport along the length of the nanotubes (~10 µm height). Experimental results indicated that the height of the Si-VACNT electrodes did not limit Li transport, even though that height was orders of magnitude greater than the diameter of the tubes. Simulation and experimental data indicated that time constant for Li diffusion into silicon was slow, even though the diffusion distance was short relative to the tube height. Other factors such as diffusion-induced stress likely had a significant impact on diffusion through the thin silicon layer. Solid Polymer Electrolytes. A thorough understanding of the relationships between physical, transport, and electrochemical properties was studied. HNT addition to polyethylene oxide (PEO) electrolytes not only improved the physical properties, such as reduction of the crystallinity of PEO, but also enhanced transport properties like the salt diffusivity. The processing steps were important for achieving enhanced properties. Moreover, HNTs were found to stabilize the interfacial properties of the SPE films during cycling. Specifically, HNT-containing SPE films were successfully cycled at room temperature, which may have important implications for SPE-based batteries.
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Aslanbas, Özgür Verfasser], Rüdiger-A. [Akademischer Betreuer] [Eichel, Joachim [Akademischer Betreuer] Mayer y Egbert [Akademischer Betreuer] Figgemeier. "Synthesis and characterization of Al-Si alloys for anode materials of metal-air batteries / Özgür Aslanbas ; Rüdiger-A. Eichel, Joachim Mayer, Egbert Figgemeier". Aachen : Universitätsbibliothek der RWTH Aachen, 2021. http://d-nb.info/1240765541/34.
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Vanpeene, Victor. "Étude par tomographie RX d'anodes à base de silicium pour batteries Li-ion". Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI023/document.
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De par sa capacité spécifique théorique dix fois plus élevée que celle du graphite actuellement utilisé comme matériau actif d'anode pour les batteries Li-ion, le silicium peut jouer un rôle important dans l'augmentation de la densité d'énergie de ces systèmes. La réaction d'alliage mise en place lors de sa lithiation se traduit cependant par une forte expansion volumique du silicium (~300 % contre seulement ~10 % pour le graphite), conduisant à la dégradation structurale de l'électrode, affectant notablement sa tenue au cyclage. Comprendre en détail ces phénomènes de dégradation et développer des stratégies pour limiter leur impact sur le fonctionnement de l'électrode présentent un intérêt indéniable pour la communauté scientifique du domaine. L'objectif de ces travaux de thèse était en premier lieu de développer une technique de caractérisation adaptée à l'observation de ces phénomènes de dégradation et d'en tirer les informations nécessaires pour optimiser la formulation des anodes à base de silicium. Dans ce contexte, nous avons utilisé la tomographie aux rayons X qui présente l'avantage d'être une technique analytique non-destructive permettant le suivi in situ et en 3D des variations morphologiques s'opérant au sein de l'électrode lors de son fonctionnement. Cette technique a pu être adaptée à l'étude de cas du silicium en ajustant les volumes d'électrodes analysés, la résolution spatiale et la résolution temporelle aux phénomènes à observer. Des procédures de traitement d'images adéquates ont été appliquées afin d'extraire de ces analyses tomographiques un maximum d'informations qualitatives et quantitatives pertinentes sur leur variation morphologique. De plus, cette technique a pu être couplée à la diffraction des rayons X afin de compléter la compréhension de ces phénomènes. Nous avons ainsi montré que l'utilisation d'un collecteur de courant 3D structurant en papier carbone permet d'atténuer les déformations morphologiques d'une anode de Si et d'augmenter leur réversibilité en comparaison avec un collecteur de courant conventionnel de géométrie plane en cuivre. Nous avons aussi montré que l'utilisation de nanoplaquettes de graphène comme additif conducteur en remplacement du noir de carbone permet de former un réseau conducteur plus à même de supporter les variations volumiques importantes du silicium. Enfin, la tomographie RX a permis d'étudier de façon dynamique et quantitative la fissuration et la délamination d'une électrode de Si déposée sur un collecteur de cuivre. Nous avons ainsi mis en évidence l'impact notable d'un procédé de "maturation" de l'électrode pour minimiser ces phénomènes délétères de fissuration-délamination de l'électrodeBecause of its theoretical specific capacity ten times higher than that of graphite currently used as active anode material for Li-ion batteries, silicon can play an important role in increasing the energy density of these systems. However, the alloying reaction set up during its lithiation results in a high volume expansion of silicon (~300% compared with only ~10% for graphite) leading to the structural degradation of the electrode, which is significantly affecting its cycling behavior. Understanding in detail these phenomena of degradation and developing strategies to limit their impact on the functioning of the electrode are of undeniable interest for the scientific community of the field. The objective of this thesis work was first to develop a characterization technique adapted to the observation of these degradation phenomena and to draw the necessary information to optimize the formulation of silicon-based anodes. In this context, we have used X-ray tomography which has the advantage of being a non-destructive analytical technique allowing in situ and 3D monitoring of the morphological variations occurring within the electrode during its operation. This technique has been adapted to the case study of silicon by adjusting the analyzed electrode volumes, the spatial resolution and the temporal resolution to the phenomena to be observed. Appropriate image processing procedures were applied to extract from these tomographic analyzes as much qualitative and quantitative information as possible on their morphological variation. In addition, this technique could be coupled to X-ray diffraction to complete the understanding of these phenomena. We have shown that the use of a carbon paper structuring 3D current collector makes it possible to attenuate the morphological deformations of an Si anode and to increase their reversibility in comparison with a conventional copper current collector of plane geometry. We have also shown that the use of graphene nanoplatelets as a conductive additive to replace carbon black can form a conductive network more able to withstand the large volume variations of silicon. Finally, the X-ray tomography allowed studying dynamically and quantitatively the cracking and delamination of an Si electrode deposited on a copper collector. We have thus demonstrated the significant impact of a process of "maturation" of the electrode to minimize these deleterious phenomena of cracking-delamination of the electrode
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Si, Wenping. "Designing Electrochemical Energy Storage Microdevices: Li-Ion Batteries and Flexible Supercapacitors". Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-160049.
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Die Menschheit steht vor der großen Herausforderung der Energieversorgung des 21. Jahrhundert. Nirgendwo ist diese noch dringlicher geworden als im Bereich der Energiespeicherung und Umwandlung. Konventionelle Energie kommt hauptsächlich aus fossilen Brennstoffen, die auf der Erde nur begrenzt vorhanden sind, und hat zu einer starken Belastung der Umwelt geführt. Zusätzlich nimmt der Energieverbrauch weiter zu, insbesondere durch die rasante Verbreitung von Fahrzeugen und verschiedener Kundenelektronik wie PCs und Mobiltelefone. Alternative Energiequellen sollten vor einer Energiekrise entwickelt werden. Die Gewinnung erneuerbarer Energie aus Sonne und Wind sind auf jeden Fall sehr wichtig, aber diese Energien sind oft nicht gleichmäßig und andauernd vorhanden. Energiespeichervorrichtungen sind daher von großer Bedeutung, weil sie für eine Stabilisierung der umgewandelten Energie sorgen. Darüber hinaus ist es eine enttäuschende Tatsache, dass der Akku eines Smartphones jeglichen Herstellers heute gerade einen Tag lang ausreicht, und die Nutzer einen zusätzlichen Akku zur Hand haben müssen. Die tragbare Elektronik benötigt dringend Hochleistungsenergiespeicher mit höherer Energiedichte. Der erste Teil der vorliegenden Arbeit beinhaltet Lithium-Ionen-Batterien unter Verwendung von einzelnen aufgerollten Siliziumstrukturen als Anoden, die durch nanotechnologische Methoden hergestellt werden. Eine Lab-on-Chip-Plattform wird für die Untersuchung der elektrochemischen Kinetik, der elektrischen Eigenschaften und die von dem Lithium verursachten strukturellen Veränderungen von einzelnen Siliziumrohrchen als Anoden in einer Lithium-Ionen-Batterie vorgestellt. In dem zweiten Teil wird ein neues Design und die Herstellung von flexiblen on-Chip, Festkörper Mikrosuperkondensatoren auf Basis von MnOx/Au-Multischichten vorgestellt, die mit aktueller Mikroelektronik kompatibel sind. Der Mikrosuperkondensator erzielt eine maximale Energiedichte von 1,75 mW h cm-3 und eine maximale Leistungsdichte von 3,44 W cm-3. Weiterhin wird ein flexibler und faserartig verwebter Superkondensator mit einem Cu-Draht als Substrat vorgestellt. Diese Dissertation wurde im Rahmen des Forschungsprojekts GRK 1215 "Rolled-up Nanotechnologie für on-Chip Energiespeicherung" 2010-2013, finanziell unterstützt von der International Research Training Group (IRTG), und dem PAKT Projekt "Elektrochemische Energiespeicherung in autonomen Systemen, no. 49004401" 2013-2014, angefertigt. Das Ziel der Projekte war die Entwicklung von fortschrittlichen Energiespeichermaterialien für die nächste Generation von Akkus und von flexiblen Superkondensatoren, um das Problem der Energiespeicherung zu addressieren. Hier bedanke ich mich sehr, dass IRTG mir die Möglichkeit angebotet hat, die Forschung in Deutschland stattzufindenHuman beings are facing the grand energy challenge in the 21st century. Nowhere has this become more urgent than in the area of energy storage and conversion. Conventional energy is based on fossil fuels which are limited on the earth, and has caused extensive environmental pollutions. Additionally, the consumptions of energy are still increasing, especially with the rapid proliferation of vehicles and various consumer electronics like PCs and cell phones. We cannot rely on the earth’s limited legacy forever. Alternative energy resources should be developed before an energy crisis. The developments of renewable conversion energy from solar and wind are very important but these energies are often not even and continuous. Therefore, energy storage devices are of significant importance since they are the one stabilizing the converted energy. In addition, it is a disappointing fact that nowadays a smart phone, no matter of which brand, runs out of power in one day, and users have to carry an extra mobile power pack. Portable electronics demands urgently high-performance energy storage devices with higher energy density. The first part of this work involves lithium-ion micro-batteries utilizing single silicon rolled-up tubes as anodes, which are fabricated by the rolled-up nanotechnology approach. A lab-on-chip electrochemical device platform is presented for probing the electrochemical kinetics, electrical properties and lithium-driven structural changes of a single silicon rolled-up tube as an anode in lithium ion batteries. The second part introduces the new design and fabrication of on chip, all solid-state and flexible micro-supercapacitors based on MnOx/Au multilayers, which are compatible with current microelectronics. The micro-supercapacitor exhibits a maximum energy density of 1.75 mW h cm-3 and a maximum power density of 3.44 W cm-3. Furthermore, a flexible and weavable fiber-like supercapacitor is also demonstrated using Cu wire as substrate. This dissertation was written based on the research project supported by the International Research Training Group (IRTG) GRK 1215 "Rolled-up nanotech for on-chip energy storage" from the year 2010 to 2013 and PAKT project "Electrochemical energy storage in autonomous systems, no. 49004401" from 2013 to 2014. The aim of the projects was to design advanced energy storage materials for next-generation rechargeable batteries and flexible supercapacitors in order to address the energy issue. Here, I am deeply indebted to IRTG for giving me an opportunity to carry out the research project in Germany. September 2014, IFW Dresden, Germany Wenping Si
Libros sobre el tema "Anode Si"
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Sheng jing de wen xue xing quan shi yu Xibolai jing shen de tan qiu: Maxiu, Anuode zong jiao si xiang yan jiu. Beijing: Beijing da xue chu ban she, 2007.
Buscar texto completoCapítulos de libros sobre el tema "Anode Si"
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Ahn, Seongki y Toshiyuki Momma. "Electrochemically Deposited Si–O–C Anode". En Next Generation Batteries, 333–45. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6668-8_30.
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Wang, Heng, Bing Li y Zuxin Zhao. "Electrodeposited Si-Al Thin Film as Anode for Li Ion Batteries". En TMS 2014: 143rd Annual Meeting & Exhibition, 891–97. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-48237-8_105.
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Wang, Heng, Bing Li y Zuxin Zhao. "Electrodeposited Si-Al Thin Film as Anode for Li Ion Batteries". En TMS 2014 Supplemental Proceedings, 891–97. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118889879.ch105.
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Samaras, I., L. Tsiakiris, S. Kokkou, O. Valassiades y Th Karakostas. "Li-Si System Studies as Possible Anode For Li-Ion Batteries". En New Trends in Intercalation Compounds for Energy Storage, 597–600. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0389-6_55.
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Niu, Qiaoli, Hengsheng Wu, Yongtao Gu, Yanzhao Li, Wenjin Zeng y Yong Zhang. "Polymer light-emitting diode with resistivity optimized p-type Si anode". En Advances in Energy Science and Equipment Engineering II, 1327–30. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2017. http://dx.doi.org/10.1201/9781315116174-91.
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Jung, Ju-Young, Myung Hoon Kim, Hee Soo Moon y Jong Wan Park. "Electrochemical Characteristics of Si/Mo Multilayer Anode for Microbattery in MEMS". En Materials Science Forum, 558–61. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-966-0.558.
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Cho, Gyu Bong, Min Gan Song, Won Chul Sin, Tae Hyun Nam y Ki Won Kim. "Structural and Electrochemical Properties of a Si/C/Cu Film Anode Electrode". En Materials Science Forum, 1057–60. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-431-6.1057.
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Vattappara, Kevin, Sushmit Bhattacharjee, Yashdeep Srivastava, Benson K. Money y Parvati Ramaswamy. "Preparation of Si-Graphite Composites as Anode Material in Li Ion Batteries". En Advances in Sustainability Science and Technology, 389–99. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4321-7_33.
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Sengupta, Amrita, Sourav Das y Jeevanjyoti Chakraborty. "Correction to: Surface Stress Effects in Nanostructured Si Anode Particles of Lithium-ion Batteries". En Recent Advances in Computational Mechanics and Simulations, C1. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8315-5_56.
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Kim, Hyeongjo, Kelimu Tulugan, Fanghong Xue, Chunjing Liu, Xinglong Dong y Wonjo Park. "The preparation and electrochemical performances of Al-Si/C nanocomposite anode for lithium ion battery". En PRICM, 213–20. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118792148.ch27.
Texto completoActas de conferencias sobre el tema "Anode Si"
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Bansal, Parth y Yumeng Li. "Multi-Physics Simulation for Morphology Design of Si Anode". En ASME 2023 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/imece2023-113107.
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Abstract Due to a constant increase in the usage of portable battery power storage and delivery systems, there is a constant need for innovation in the area of battery design. One such possible innovation is the use of Silicon (Si) as the anode material in Lithium-Ion Batteries (LIBs). While Si is a much better anode material than the traditionally used graphite anode, its usage comes with its own issues. The intercalating mechanism in Si anodes for Li ion storage, causes an increase in the specific capacity of battery along with significant variation in the volume of Si during the charge/discharge cycling. Volumetric variations of up to 300% are observed during the lithiation/delithiation in the Si anode which results in the development of massive internal stresses in the anode. These internal stresses are observed to cause delamination of the anode from the metal substrate and also the cracking within the anode material itself, which ultimately decreases the capacity of the battery. A possible solution to this problem is to design the morphology of nickel backbones in Si anode to reduce the intensity of the internal stresses and therefore the resulted failure and capacity degradation. In this paper, multiphysics simulation based on finite element analysis is developed to understand and quantify the effect of the morphology of nickel backbone on the lithiation induced stress in the Si anode. A convex and concave anode structure, along with a flat design for comparison, will be simulated for different lithiation/delithiation rates, using the FE model and the FE analysis will be conducted to investigate the changes in the corresponding stresses in Si layer, the cracking pattern and the delaminated area. It is expected the developed multiphysics FE simulations can inform the morphological design of anode to minimize the mechanical degradation and reduce capability loss.
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Zheng, Zhuoyuan, Zheng Liu, Pingfeng Wang y Yumeng Li. "Design of Three-Dimensional Bi-Continuous Silicon Based Electrode Materials for High Energy Density Batteries". En ASME 2022 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/detc2022-89652.
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Abstract Silicon-based anode is a promising candidate for next generation lithium-ion batteries (LIBs) with improved energy and power density. However, the practical application of Si anode is hindered by their major reliability issue that Si experiences significant volume change during its lithiation/delithiation cycles, leading to high stress, degradation, and pulverization of the anode. With the development of advanced electrode fabrication technologies, structured Si anodes with delicately designed architectures have been proposed. This study focuses on five triply periodic minimal surface (TPMS) based 3D bi-continuous porous Si anodes, which consist of the nano structured metal scaffolds and conformally coated Si layers and explores their lithiation-induced stresses via numerical methods. The multi-physics based finite element (FE) models are firstly built to simulate the deformation and stress of Si anodes during lithiation processes. Afterwards, the Gaussian Processes (GP) based surrogate model is developed to assist the design optimization of the Si anodes within the design space. It is found that, the inverse FCC and diamond surface-based Si anodes show better performances with the lowest stress concentration. In addition, with the decrease of Si phase volume fraction and increase of scaffold fraction, the stresses can be further reduced.
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Ma, Jun, Christopher Rahn y Mary Frecker. "Multifunctional NMC-Si Batteries With Self-Actuation and Self-Sensing". En ASME 2017 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/smasis2017-3886.
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Among anode materials for lithium ion batteries, silicon (Si) is known for high theoretical capacity and low cost. Si changes volume by 300% during cycling, however, often resulting in fast capacity fade. With sufficiently small Si particles in a flexible composite matrix, the cycle life of Si anodes can be extended. Si anodes also demonstrate stress-potential coupling where the open circuit voltage depends on applied stress. In this paper, we present a NMC-Si battery design, utilizing the undesired volume change of Si for actuation and the stress-potential coupling effect for sensing. The battery consists of one Li(Ni1/3Mn1/3Co1/3)O2 (NMC) cathode in a separator pouch placed in an electrolyte-filled container with Si composite anode cantilevers. Models predict the shape of the cantilever as a function of battery state of charge (SOC) and the cell voltage as a function of distributed loading. Simulations of a copper current collector coated with Si active material show 11.05 mAh of energy storage, large displacement in a unimorph configuration (>60% of beam length) and over 100 mV of voltage change due to gravitational loading.
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Wu, James J. y William R. Bennett. "Fundamental investigation of Si anode in Li-Ion cells". En 2012 IEEE Energytech. IEEE, 2012. http://dx.doi.org/10.1109/energytech.2012.6304667.
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Zheng, Zhuoyuan, Yanwen Xu, Bo Chen y Pingfeng Wang. "Gaussian Process Based Crack Initiation Modeling for Design of Battery Anode Materials". En ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97547.
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Abstract Silicon-based anode is one of the promising candidates for the next generation lithium ion batteries (LIBs) to achieve high power/energy density. However, the major drawback limiting the practical application of Si anode is that Si experiences significant volume change during its lithiation/de-lithiation cycles, which induces high stress and causes degradation and pulverization of the anode. This study focuses on the crack initiation performances of Si anode during the de-lithiation process. A multi-physics based finite element (FE) model is built to simulate the electrochemical process and crack generation during de-lithiation. On top of that, a Gaussian Processes (GP) based surrogate model is developed to assist the exploration of the crack initiation performances within the anode design space. It is found that, the thickness of the Si coating layer TSi, the yield strength σFc of Si material, the cohesive strength between Si and substrate σFs, and the curvature of the substrate ρ have large impacts on the cracking behavior of Si. This coupled FE simulation-GP surrogate model framework is also applicable to other types of LIB electrodes.
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Ma, Jun, Cody Gonzalez, Christopher Rahn, Mary Frecker y Donghai Wang. "Experimental Study of Multifunctional NCM-Si Batteries With Self-Actuation". En ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/smasis2018-8004.
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Among anode materials for lithium ion batteries, silicon (Si) in known for high theoretical capacity and low cost. Si exhibits over 300% volume change during cycling, potentially providing large displacement. In this paper, we present the design, fabrication and testing of a multifunctional NCM-Si battery that not only stores energy, but also utilizes the volume change of Si for actuation. The battery is transparent, thus allowing the visualization of the actuation process during cycling. This paper shows Si anode design that stores energy and actuates through volume change associated with lithium insertion. Experimental results from a transparent battery show that a Cu current collector single-side coated with Si nanoparticles can store 10.634 mWh (charge)/2.074mWh (discharge) energy and bend laterally with over 40% beam length displacement. The unloaded anode is found to remain circular shape during cycling. Using a unimorph cantilever model, the Si coating layer actuation strain is estimated to be 30% at 100% SOC.
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Gonzalez, Cody, Jun Ma, Mary Frecker y Christopher Rahn. "Analytical Modeling of a Multifunctional Segmented Lithium Ion Battery Unimorph Actuator". En ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/smasis2018-8123.
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Silicon anodes in lithium ion batteries have high theoretical capacity and large volumetric expansion. In this paper, both characteristics are used in a segmented unimorph actuator consisting of several Si composite anodes on a copper current collector. Each unimorph segment is self-actuating during discharge and the discharge power can be provided to external circuits. With no external forces and zero current draw, the unimorph segments will maintain their actuated shape. Stress-potential coupling allows for the unimorph actuator to be self-sensing because bending changes the anodes’ potential. An analytical model is derived from a superposition of pure bending and extensional deformation forces and moments induced by the cycling of a Si anode. An approximately linear relationship between axial strain and state of charge of the anode drives the bending displacement of the unimorph. The segmented device consists of electrically insulated and individually controlled segments of the Si-coated copper foil to allow for variable curvature throughout the length of the beam. The model predicts the free deflection along the length of the beam and the blocked force. Tip deflection and blocked force are shown for a range of parameters including segment thicknesses, beam length, number of segments, and state of charge. The potential applications of this device include soft robots and dexterous 3D grippers.
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Yang, Ruinan, Zhongnan Ran y Dimitris Assanis. "Estimation of Wiebe Function Parameters for Syngas and Anode Off-Gas Combustion in Spark-Ignition Engines". En ASME 2021 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/icef2021-67863.
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Abstract Wiebe functions, analytical equations that estimate the fuel mass fraction burned (MFB) during combustion, have been effective at describing spark-ignition (SI) engine combustion using gasoline fuels. This study explores if the same methodology can be extended for SI combustion with syngas, a gaseous fuel mixture composed of H2, CO, and CO2, and anode-off gas; the latter is an exhaust gas mixture emitted from the anode of a Solid Oxide Fuel Cell, containing H2, CO, H2O, and CO2. For this study, anode off-gas is treated as a syngas fuel diluted with CO2 and vaporized water. Combustion experiments were run on a single-cylinder, research engine using syngas and anode-off gas as fuels. One single Wiebe function and three double Wiebe functions were fitted and compared with the MFB profile calculated from the experimental data. It was determined that the SI combustion process of both the syngas and the anode-off gas could be estimated using a governing Wiebe function. While the detailed double Wiebe function had the highest accuracy, a reduced double Wiebe function is capable of achieving comparable accuracy. On the other hand, a single Wiebe function is not able to fully capture the combustion process of a SI engine using syngas and anode off-gas.
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Bansal, Parth y Yumeng Li. "Multiphysics-Informed Machine Learning for Mechanical-Induced Degradation of Silicon Anode". En ASME 2023 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/imece2023-113404.
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Abstract Silicon (Si) anode based lithium-ion batteries (LIBs) are being developed and used in various portable electronic technologies because of their better life cycle performance and safety. These Si anode based LIBs also provide a better capacity due to the unique intercalating mechanisms of lithium (Li) into Si. However, due to this unique mechanism, volumetric changes upto 300% have been observed in these batteries that leads to the development of internal stresses in the Si anode which ultimately results in cracking and delamination in it. These two cracking and delamination failure modes along with the growth of the solid electrolyte interface (SEI) on the exposed surface of Si anode leads to loss in the overall capacity of the battery. The capacity degradation can be simulated using FE models but these models take a long time to run and are computationally expensive. Hence, in this study, we develop a physics-informed machine learning technique for the capacity degradation of the Si anode based LIBs. 3D finite element (FE) models are built to understand the volumetric stresses induced cracking and delamination along with the capacity loss due to the growth of the SEI layer. The outputs from these FE models are then used to train the Gaussian process regression (GPR) surrogate model which can be used for the design of LIBs towards application-oriented properties such as high energy storage, fast charging or optimal life time by quickly and accurately predicting the capacity degradation in the battery.
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Yuan, Yong-bo, Shu-ming Chen, Jia-rong Lian, Ze-feng Xie y Xiang Zhou. "Improved efficiency in top-emitting OLEDs with p -type Si anode". En Photonics Asia 2007, editado por Jian Wang, Changhee Lee y Hezhou Wang. SPIE, 2007. http://dx.doi.org/10.1117/12.755833.
Texto completoInformes sobre el tema "Anode Si"
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Sanchez-Vazquez, Mario y Nancy Perez-Peralta. Theoretical Study of Si(x)Ge(y)Li(z)- (x=4-10, y=1-10, z=0-10) Clusters for Designing of Novel Nanostructured Materials to be Utilized as Anodes for Lithium-Ion Batteries. Fort Belvoir, VA: Defense Technical Information Center, marzo de 2015. http://dx.doi.org/10.21236/ad1013217.
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