Дисертації з теми "Lithium gel polymer electrolyte system"
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Chamaani, Amir. "Hybrid Polymer Electrolyte for Lithium-Oxygen Battery Application." FIU Digital Commons, 2017. https://digitalcommons.fiu.edu/etd/3562.
Повний текст джерелаSafa, Meer N. "Poly (Ionic Liquid) Based Electrolyte for Lithium Battery Application." FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3746.
Повний текст джерелаPiana, Giulia. "Electrolyte solide innovant à base de liquides ioniques pour micro-accumulateurs au lithium : réalisation par voie humide et caractérisation des propriétés de transport." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS359/document.
Повний текст джерелаNew deposition techniques compatible with making tridimensional geometries are currently being investigated with the aim of improving the performances of lithium microbatteries. This work focuses on the development of a new quasi-solid electrolyte deposited by a “wet process”. An ionic liquid-based membrane containing a lithium salt was prepared by the photo-induced polymerization of a dimethacrylate oligomer. New methods such as a new type of conductivity cell based on planar interdigitated electrodes to measure ionic conductivity as well as in-situ monitoring of photo-polymerization using impedance spectroscopy were used. Transport properties of lithium ion were measured by PGSE-NMR. Interestingly, a significant reduction of lithium ion mobility was observed after UV-curing while the total ionic conductivity only decreased slightly. This phenomenon is due to the formation of lithium ion complexes with ethylene oxide moieties of the solid matrix, evidenced by Raman spectroscopy measurements. Additionally, we have shown that the structures of the complexes depend on the salt concentration and a dual solid/liquid transport mechanism was suggested. Hence, in order to improve lithium ion diffusion, a co-polymer was added in an attempt to decrease the cross-linking density of the solid matrix thus improving its segmental motion. The cyclability of the all solid state micro batteries was indeed improved. Comparable performances with the standard solid electrolyte LiPON were obtained at room temperature. In summary, it was established that electrochemical performances of the solid state microbatteries depend to a certain extent on the structure of the polymer electrolyte. Therefore it is possible to find new ways in designing these types of electrolytes for further improvement
DESTRO, MATTEO. "Towards Realization of an Innovative Li-Ion Battery: Materials Optimization and System Up-Scalable Solutions." Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2506270.
Повний текст джерелаChaudoy, Victor. "Electrolytes polymères gélifiés pour microbatteries au lithium." Thesis, Tours, 2016. http://www.theses.fr/2016TOUR4019/document.
Повний текст джерелаIn this thesis, a new polymer gel electrolyte was prepared and optimized for Li based microbatteries. The gel consisted of an ionic liquid based phase (P13FSI/LiTFSI) confined in a semi-interpenetrating polymers (sIPN) network (PVdF-HFP/crosslinked PEO). sIPN electrolytes were prepared and optimized according to the PVdFHFP/ crosslinked PEO ratio and the liquid phase fraction. Furthermore, the sIPN electrolyte was used as an electrolyte in Li/LiNi1/3Mn1/3Co1/3O2 battery. The performances of the battery (specific capacity, efficiency, cyclability) were determined and compared to batteries using a crosslinked PEO or PVdF-HFP based gel. Such a thin and stable sIPN electrolyte film enabled the preparation of Li based microbatteries using thermal evaporation deposition of lithium directly conducted on the sIPN electrolyte film. This assembly (Li/sIPN) was therefore used to prepare a LiCoO2/sIPN gel/Li quasi solid-state microbattery. This microbattery showed a stable nominal capacity of 850 μAh for over 100 cycles of charge and discharge under 1 C rate at 25°C
Krejza, Ondřej. "Gelové polymerní elektrolyty pro elektrochromní prvky." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233503.
Повний текст джерелаSzotkowski, Radek. "Gelové polymerní elektrolyty s nanočásticemi." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-319296.
Повний текст джерелаGeorge, Sweta Mariam. "Exploring Soft Matter and Modified-Liquid Electrolytes for Alkali metal (Li, Na) Based Rechargeable Batteries." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5913.
Повний текст джерелаSen, Sudeshna. "A Few Case Studies of Polymer Conductors for Lithium-based Batteries." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/3019.
Повний текст джерелаSen, Sudeshna. "A Few Case Studies of Polymer Conductors for Lithium-based Batteries." Thesis, 2016. http://hdl.handle.net/2005/3019.
Повний текст джерелаYu-HsienTseng and 曾宇賢. "On-Site Coagulation Type Gel Polymer Electrolyte for Lithium Batteries." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/q6k829.
Повний текст джерелаSheng-MinWang and 王勝民. "Application of Highly Ordered Polymer Resin as Gel Polymer Electrolyte for Lithium Batteries: Performace Test with LiFePO4-Cathode, Lithium metal-Anode." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/42986724064808121003.
Повний текст джерела國立成功大學
化學系
102
Gel polymer electrolytes (GPE) have been attractive for the development of plastic Li ion batteries since they combine the advantages of liquid electrolytes (high ionic conductivity) and polymers (free from leaks, good mechanical strength). Gel polymer electrolytes (GPEs) were prepared by dipping a solid polymer electrolyte in 1.0M LiPF6 in ethylene carbonate (EC)/ dimethyl carbonate (DMC)/diethyl carbonate (DEC)(1:1:1 wt% + 2wt% VC) liquid electrolyte. Compare to commercial liquid electrolyte (LE). GPE has a stable electrochemical window up to 5 V vs. Li/Li+. Higher ionic conductivity up to above 1×10-3S/cm from 10 to 90 degrees C. Better lithium ion dissociation ability and higher transfer number (0.6). The performance test are evaluated in half-cell configurations (Li/GPE/LiFePO4)with different discharge rates. The specific half-cell capacities of GPE membraneis similar to commercial separator LE (from 0.1 to 1 C). Moreover, GPE has good cycling stability at room temperature. The specific properties of the polymer electrolyte membrane allow it to act as both an ionic conductor and separator.
Lu, ming-yi, and 呂明怡. "New polymer electrolyte for lithium battery base PVDF-HFP system." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/38861348742433695363.
Повний текст джерела國立中央大學
化學研究所
92
Abstract Rechargeable lithium ionic battery, compared to other secondary batteries, has the advantages of high working potential, high specific energy, wide applied temperature and no memory effect. However, in order to make a small light-weight batteries, a solid electrolyte was needed. Solid polymer electrolytes can be categorized into three types: dry-type polymer electrolyte, gel-type polymer electrolyte, and porous-type polymer electrolyte. In this studies, two systems were studied: polyaniline derivative was blended with PEO-LiClO4 electrolyte to increase the ionic conductivity of the dry-type polymer electrolyte and PVDF-HFP was mixed with polyalkoxy block copolymer such as P123 (Mw=5750) or F108 (Mw=14600) to form porous-type polymer membranes. The porous polymer membranes were then sock in LiClO4-EC/PC solution to form porous-type electrolytes. It was found that the ionic conductivity of dry-type polymer electrolyte is too low to be commercially viable. Therefore, the study is mainly focused on the porous-type polymer electrolyte. The porous membranes were prepared by both phase inversion and evaporating methods. They were then immersed in 1 M LiClO4 –EC/PC (1:1) solution to form porous polymer electrolytes. The pore structure and density of polymer membrane varied with the ratios of P123 (or F108). Low solution leakage, high conductivity polymer electrolyte was found when 30 ~ 50 wt% of P123 was blend with PVDF-HFP. The room temperature conductivity of these hybrid porous polymer electrolytes was up to 4 × 10-3 S/cm and they can stand up to 5.0 V. They have great potential to be applied in lithium ion batteries.
Cheng, Cheng-Liang, and 鄭丞良. "Conductive Behavior of Lithium Ions in Polyacrylonitrile-based Gel Polymer Electrolyte Containing Non-solvent." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/81015026084299217310.
Повний текст джерелаZhang, J. "Investigation of polymers used in lithium oxygen batteries as electrolyte and cathode materials." Thesis, 2013. http://hdl.handle.net/10453/23554.
Повний текст джерелаIt has been well established that the electrolytes and cathodes have a significant effect on the electrochemical performance of lithium oxygen batteries. In this Master project, polymers were employed as electrolyte and cathode materials due to their unique superior properties. Using different methods, we synthesized suitable gel polymer electrolytes and conducting polymer catalysts for lithium oxygen batteries. Techniques such as field emission gun scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy were used to characterize the physical properties. Electrochemical analyses including the galvanostatic discharge and charge method, the cyclic voltammetry, the linear sweep voltammetry and the impedance spectra were conducted to determine the electrochemical performance for the as-prepared materials. Gel polymer electrolytes based on low molecular weight polyethylene glycol were prepared and used as electrolyte in lithium oxygen batteries. The as-prepared polymer electrolytes showed improved stability compared with liquid electrolytes and exhibited good performance in lithium oxygen batteries. Additionally, the addition of ceramic filler SiO₂ was found to reduce the stability of polymer electrolyte towards oxygen reduction reaction although higher ionic conductivity was obtained. Polyethylene glycol based gel polymer electrolyte without SiO₂ addition exhibited excellent cycling performance and it could be used for achieving long-life lithium oxygen batteries. Poly(vinylidene fluoride-co-hexafluoropropylene) based gel polymer electrolytes were prepared by solvent casting and employed as electrolytes in lithium oxygen batteries. The stability of the gelled electrolyte with tetraethylene glycol dimethyl ether has been greatly increased than the liquid one. The as-prepared polymer electrolyte was demonstrated excellent cycling performances. This thesis also investigated the effect of different plasticizers on the performance of lithium oxygen batteries. The reason could lie on the interactions among the components when the gelled structure was set. The tetraethylene glycol dimethyl ether based gel polymer electrolyte showed the best electrochemical performance and can be used for long-life lithium oxygen batteries. Polypyrrole conducting polymers with different dopants have been synthesized and applied as the cathode catalysts in lithium oxygen batteries. Polypyrrole polymers exhibited an effective catalytic activity for oxygen reduction in lithium oxygen batteries. It was discovered that dopant significantly influenced the electrochemical performance of polypyrrole. The polypyrrole doped with Cl⁻ demonstrated higher capactity and more stable cyclability than that doped with ClO₄⁻. Polypyrrole conducting polymers also exhibited higher capacity and better cycling performance than that of carbon catalyst. Conducting polymer coated carbon nanotubes were synthesized and used as catalysts in lithium oxygen batteries. It was found that both polypyrrole and poly(3,4-ethylenedioxythiophene) coated carbon nanotubes could provide high cycling performance while polypyrrole based one exhibited higher capacities. The ratio of conducting polymer coating also affected the electrochemical performance of lithium oxygen batteries. The conducting polymer coated carbon nanotubes also showed better performance than the bare carbon nanotubes.
Wu, Chiung-Hui, and 吳炯輝. "New Polymer Electrolyte for Lithium battery Based on PEO-PAN-LiClO4 System." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/85015927562567652565.
Повний текст джерела國立中央大學
化學研究所
91
Abstract Since 1975 Wright et al. discovered the ionic conductivity (1x10-7 S/cm) of PEO-Lithium salt, PEO-Lthium salt based solid electrolytes have under extensively studied. However, the room temperature conductivities of PEO-Li salts are usually too low (due to the semi-crystalline nature of PEO) to be applied practically in lithium batteries. Therefore, increasing the conductivity via various physical or chemical methods has become the major research efforts. To enhance the conductivity of PEO-LiClO4 system, one of the good strategies was forming polymer blend. In this thesis, we blended the precursor of conjugated polymer PAN (polyacrylonitrile) (with PAN/PEO ratios equal to 0wt%, 1wt%, 3wty%, 5wt%) into the PEO-LiClO4 system (and/or heat the blend polymer to crosslink the PAN) to increase the conductivity and film dimension stability. It was found that by adding 1wt% PAN into PEO-LiClO4(15wt%) the hybrid polymer electrolyte has the highest ionic conductivity (up to 6.8x10-4 S/cm at 50oC) and exhibit good mechanical properties. Heating the polymer blends up to 200oC can further increase their conductivity. XRD data showed that the domain size of PEO-LiClO4-PAN is smaller than that of PEO-LiClO4. DSC results also indicated that both the melting point and crystalinility of PEO-LiClO4(15wt%) decreased after adding PAN. The crystallinity of PAN- PEO-LiClO4(15wt%) decreased further after rapidly heating and cooling of the electrolyte films. SEM micrographs showed that when small amount of PAN (PAN/PEO <5wt%) was added, the electrolyte films have a smoother surface compared to pure PEO-LiClO4. The function of PAN can be regarded as a polymer support for dispersing PEO matrix and increase the dimension stability when the crystallinity of PEO decreased.
Po-TingLin and 林柏廷. "Exploring the Effects of Nanofillers on the Lithium Ion Conduction Mechanism of Gel Polymer Electrolyte for Lithium Ion Battery via Multiscale Molecular Simulation." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/mdk4u2.
Повний текст джерелаLai, Bo-Yu, and 賴柏宇. "Lithium Sulfur Battery Materials Development and Electrochemical Analysis – Effects of PVDF Based Gel Polymer Electrolyte on Dendrite Formation and Carbon Based Protection Layer on Lithium Sulfur Electrodes." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/g7qbwe.
Повний текст джерела國立臺灣大學
生物產業機電工程學研究所
103
This research is dedicating to one of the most promising lithium metal battery, lithium sulfur battery. The development of this kind of lithium metal battery is facing some challenges recently, which can split to two parts. One of them is dendrite growth on the lithium metal negative electrode, which may cause some safety issue, including short-circuited and energy capacity decay. We designed a symmetric cell to in-situ observe dendrite growth when applying a constant current. In order to study the relationship between mechanical strength and dendrite growth, we fabricated the cell with different gel polymer electrolyte with different Young’s modulus. We found that when using the gel polymer electrolyte which Young’s modulus is 0.05548MPa and the current density is 0.1mA/cm2, dendrite would not grow in the first 3000 minutes. We also found that the mechanism of oxidation of lithium metal is very similar to pitting corrosion. When using the electrolyte which diffusivity is lower, the phenomena of pitting corrosion is less apparent. The other part is the dissolution of sulfur electrode. Due to its physic properties, the lithium sulfide would gradually dissolve into the electrolyte. This may cause some energy capacity decay. We add an additional layer into the cell to be a protect layer. This layer could efficiently adsorb the lithium sulfide that dissolved into the solution, reducing the decay rate of the cell. We also mixed MWCNT with carbonized lignin, and found that 50% 900℃ carbonized lignin MWCNT film could make the cell remain 1000mAh/g S capacity after 60 cycles(0.1C).
You-ChaoShih and 施友超. "Poly(ethylene oxide-co-propylene oxide)-Based Gel Polymer Electrolyte for Lithium Ion Batteries: Performance Tests with LiFePO4-Cathode, graphite- and TiO2-Anodes." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/73542413665442816876.
Повний текст джерела國立成功大學
化學工程學系碩博士班
101
In this study, we used PEDGE, DGEBA and D2000 by cross-linking to synthesis the copolymer –poly(ethylene oxide)-co-poly(propylene oxide) (P(EO-co-PO)). Immersing the polymer film into the organic electrolyte for 24 hours, then we got the gel polymer electrolyte (GPE). Took this GPE film to assemble batteries and test its performance. Compare the difference between GPE and the organic liquid electrolyte battery (LE) , find out the advantages of GPE. Compare to LE, the proposed GPE has higher ionic conductivity (3.8210-3 S cm-1 at 30 °C) and a wider electrochemical voltage range (5V). Besides, P(EO-co-PO) copolymer equipped better Lithium ion dissociation ability and higher transfer number (0.7). This high GPE transference number decreases electrode polarization caused by anion accumulation and suppresses the concentration gradient to facilitate lithium ion transport. That made the electrolyte-electrode surface of GPE more stable than LE with lower resistance. Therefore, the performance can be better at higher C-rate charge-discharge test and long-term stability. For battery performance test, we use LiFePO4-cathode and Graphite-anode to assemble the full-cell and compare the difference between GPE and LE. At lower C-rates, the discharge capacity is similar and the value is about 125mAh g-1. When discharge rate is higher than 10 C-rate, the performance decrease dramatically in LE full-cell, while GPE full-cell maintain the capacity even at 17C-rate. For long-term test, we conducted charge-discharge measurement at 1C-rate for 450 cycles. After 450 cycles the capacity retention maintained at ca. 77%. It’s better than the LE full-cell which kept only ca. 44%. Due to the bad performance at higher C-rates by using Graphite-anode, in this study, we also developed hydrothermal method to synthesis TiO2 nanotube. TiO2 is nontoxic, high chemical stability and low price. Moreover, the nanotube structure can help to catch the electrolyte into the tube, increase the electrolyte-electrode contact surface and decrease the distance of lithium ion diffusion. And then decrease the diffusion resistance, that resulted in a discharge capacity 70 mAh g-1 at 60C-rate.
(8083202), Andres Villa Pulido. "DESIGN AND CHARACTERIZATION OF A PEO-BASED POLYMER COMPOSITE ELECTROLYTE EMBEDDED WITH DOPED-LLZO: ROLE OF DOPANT IN BULK IONIC CONDUCTIVITY." Thesis, 2019.
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