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Добірка наукової літератури з теми "LITHIUM /PVDF"

Автор: Grafiati

Опубліковано: 21 жовтня 2023

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Статті в журналах з теми "LITHIUM /PVDF"

Hu, Yinglu, Li Liu, Jingwei Zhao, Dechao Zhang, Jiadong Shen, Fangkun Li, Yan Yang, et al. "Lithiophilic Quinone Lithium Salt Formed by Tetrafluoro-1,4-Benzoquinone Guides Uniform Lithium Deposition to Stabilize the Interface of Anode and PVDF-Based Solid Electrolytes." Batteries 9, no. 6 (June 12, 2023): 322. http://dx.doi.org/10.3390/batteries9060322.

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Анотація:

Poly(vinylidene fluoride) (PVDF)-based composite solid electrolytes (CSEs) are attracting widespread attention due to their superior electrochemical and mechanical properties. However, the PVDF has a strong polar group -CF2-, which easily continuously reacts with lithium metal, resulting in the instability of the solid electrolyte interface (SEI), which intensifies the formation of lithium dendrites. Herein, Tetrafluoro-1,4-benzoquinone (TFBQ) was selected as an additive in trace amounts to the PVDF/Li-based electrolytes. TFBQ uniformly formed lithophilic quinone lithium salt (Li2TFBQ) in the SEI. Li2TFBQ has high lithium-ion affinity and low potential barrier and can be used as the dominant agent to guide uniform lithium deposition. The results showed that PVDF/Li-TFBQ 0.05 with a mass ratio of PVDF to TFBQ of 1:0.05 had the highest ionic conductivity of 2.39 × 10−4 S cm−1, and the electrochemical stability window reached 5.0 V. Moreover, PVDF/Li-TFBQ CSE demonstrated superior lithium dendrite suppression, which was confirmed by long-term lithium stripping/sedimentation tests over 2000 and 650 h at a current of 0.1 and 0.2 mA cm−2, respectively. The assembled solid-state LiNi0.6Co0.2Mn0.2O2||Li cell showed an excellent performance rate and cycle stability at 30 °C. This study greatly promotes the practical research of solid-state electrolytes.

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Barbosa, João, José Dias, Senentxu Lanceros-Méndez, and Carlos Costa. "Recent Advances in Poly(vinylidene fluoride) and Its Copolymers for Lithium-Ion Battery Separators." Membranes 8, no. 3 (July 19, 2018): 45. http://dx.doi.org/10.3390/membranes8030045.

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Анотація:

The separator membrane is an essential component of lithium-ion batteries, separating the anode and cathode, and controlling the number and mobility of the lithium ions. Among the polymer matrices most commonly investigated for battery separators are poly(vinylidene fluoride) (PVDF) and its copolymers poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE), poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), and poly(vinylidene fluoride-cochlorotrifluoroethylene) (PVDF-CTFE), due to their excellent properties such as high polarity and the possibility of controlling the porosity of the materials through binary and ternary polymer/solvent systems, among others. This review presents the recent advances on battery separators based on PVDF and its copolymers for lithium-ion batteries. It is divided into the following sections: single polymer and co-polymers, surface modification, composites, and polymer blends. Further, a critical comparison between those membranes and other separator membranes is presented, as well as the future trends on this area.

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Kim, Min Ji, Chang Hee Lee, Mun Hui Jo, and Soon Ki Jeong. "Electrochemical Decomposition of Poly(Vinylidene Fluoride) Binder for a Graphite Negative Electrode in Lithium-Ion Batteries." Materials Science Forum 893 (March 2017): 127–31. http://dx.doi.org/10.4028/www.scientific.net/msf.893.127.

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To clarify the electrochemical decomposition of poly (vinylidene fluoride) (PVdF) used as a binder for lithium-ion batteries while simultaneously verifying the correlation between electrode resistance and the PVdF content in graphite negative electrodes, in this study, we applied lithium bis (trifluoromethanesulfonyl) imide, which suppresses graphite exfoliation, as a salt. As a result, the electrochemical decomposition of PVdF was observed at a higher potential than that at which the electrolyte was decomposed during the reduction process. Additionally, this study demonstrated (through electrochemical impedance spectroscopy analysis) that electrode resistances such as solid electrolyte interface and charge transfer resistance proportionally increased with the PVdF content.

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Nikodimos, Yosef, Wei-Nien Su, and Bing-Joe Hwang. "Lithium Dendrite Growth Suppression in Anode-Free Lithium Battery Using Bifunctional Electrospun Gel Polymer Electrolyte Membrane." ECS Meeting Abstracts MA2023-01, no. 6 (August 28, 2023): 998. http://dx.doi.org/10.1149/ma2023-016998mtgabs.

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Anode free Li metal battery (AFLMB) are being intensively investigating in recent years as a means to achieve higher capacity when compared with standard Li metal batteries. However, the severe electrolyte decomposition during plating/stripping cycles, that causes fast Li dendrite growth and quick capacity fading, is challenging for its commercialization. Herein, poly (vinylidene fluoride-hexafluoropropylene) polymer containing Li1.6Al0.4Mg0.1Ge1.5(PO4)3 ceramic filler (90:10 w% ratio, PVDF-HFP-10) gel polymer electrolyte (GPE) is employed for the first time in AFLMB to suppress the Li dendrite growth and homogeneous Li deposition is achieved during Li metal plating/stripping. The PVDF-HFP-10 based membrane is manufactured using electrospinning technique, which is well known and effective technique to increase the amount of crystalline β-phase of PVDF-HFP, on Cu collector foil. Particularly, a pure crystalline β-phase of PVDF-HFP has been observed in the adhesion layer sticked with Cu collector as confirmed from the analysis of Fourier Transform Infrared Spectroscopy (FTIR) and Raman spectroscopy measurements. The adhesion layer is further investigated using X-ray absorption spectroscopy (XAS), grazing angle X-ray diffraction (GAXRD) and X-ray photoelectron spectroscopy (XPS) techniques. The GAXRD analysis reveals Cu collector undergoes slight reconstruction of its (100) facets surface to (200) facets in the presence of the adhesion layer. Moreover, depth XPS analysis confirmed that the alignment of F atoms in the adhesion layer is toward the Cu collector which can play an important role for homogeneous Li deposition. Based on these findings, a novel approach is developed to prepare GPE, without peeling off the electrospun PVDF-HFP membrane from Cu collector to take advantage of the adhesion layer. The electrospun PVDF-HFP membrane GPE unpeeled off from its Cu collector (Cu@PVDF-HFP-10) prepared using novel method provides bifunctional applications, as electrolyte and as an artificial solid-electrolyte interphase (ASEI). The strong electrostatic interaction between the fiber sheet and its collector foil forms an adhesion layer (⁓0.5μm) which acts as ASEI prevents electrolyte decomposition. The Cu@PVDF-HFP-10|Li anode free cell enables uniform and highly compacted Li platting, excellent electrochemical performance, and high coulombic efficiency (CE) even at a high current density up to 5 mA cm− 2 (CE, 97.14%) after 200 cycles using 2 mAh cm− 2 capacity loading. Conversely, nonuniform and thick Li deposition is observed in the GPE prepared by conventional method (PVDF-HFP-10), due to poor contact between the membrane and the electrode, achieved only 90.08% CE after 100 cycles at 5 mA cm− 2. Post-cycling analyses using titration-gas chromatography (TGC) and XPS techniques indicated that the new strategy is conducive to prevent dead Li metal formation as well as to create a carbonate-free, robust, and stable SEI convenient to develop sustainable AFLMB system. Cycling performance of the Cu@PVDF-HFP-10 GPE utilized in the Cu|NMC AFLMB configuration delivered much better electrochemical performance than the PVDF-HFP-10 GPE (prepared by traditional method) and organic liquid electrolytes.

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Wang, Zhiqun, Shaokang Tian, Shangda Li, Lei Li, Yimei Yin, and Zifeng Ma. "Lithium sulfonate-grafted poly(vinylidenefluoride-hexafluoro propylene) ionomer as binder for lithium-ion batteries." RSC Advances 8, no. 36 (2018): 20025–31. http://dx.doi.org/10.1039/c8ra02122h.

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Castillo, Julen, Adrián Robles-Fernandez, Rosalía Cid, José Antonio González-Marcos, Michel Armand, Daniel Carriazo, Heng Zhang, and Alexander Santiago. "Dehydrofluorination Process of Poly(vinylidene difluoride) PVdF-Based Gel Polymer Electrolytes and Its Effect on Lithium-Sulfur Batteries." Gels 9, no. 4 (April 14, 2023): 336. http://dx.doi.org/10.3390/gels9040336.

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Анотація:

Gel polymer electrolytes (GPEs) are emerging as suitable candidates for high-performing lithium-sulfur batteries (LSBs) due to their excellent performance and improved safety. Within them, poly(vinylidene difluoride) (PVdF) and its derivatives have been widely used as polymer hosts due to their ideal mechanical and electrochemical properties. However, their poor stability with lithium metal (Li0) anode has been identified as their main drawback. Here, the stability of two PVdF-based GPEs with Li0 and their application in LSBs is studied. PVdF-based GPEs undergo a dehydrofluorination process upon contact with the Li0. This process results in the formation of a LiF-rich solid electrolyte interphase that provides high stability during galvanostatic cycling. Nevertheless, despite their outstanding initial discharge, both GPEs show an unsuitable battery performance characterized by a capacity drop, ascribed to the loss of the lithium polysulfides and their interaction with the dehydrofluorinated polymer host. Through the introduction of an intriguing lithium salt (lithium nitrate) in the electrolyte, a significant improvement is achieved delivering higher capacity retention. Apart from providing a detailed study of the hitherto poorly characterized interaction process between PVdF-based GPEs and the Li0, this study demonstrates the need for an anode protection process to use this type of electrolytes in LSBs.

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Yang, Shan Shan, Xiong Liu, Jiang Nan Shen, and Cong Jie Gao. "Comparison Study of PVDF-HMn₂O₄ and PES-HMn₂O₄ Membrane-Type Adsorbents for Lithium Adsorption/Desorption." Applied Mechanics and Materials 633-634 (September 2014): 517–20. http://dx.doi.org/10.4028/www.scientific.net/amm.633-634.517.

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Much attention has been paid to membrane-type lithium adsorbents to overcome the shortages of the leakage of powder, poor permeability and difficult recycle for powder lithium adsorbents. In this work, a series of membrane-type adsorbents of spinel-type manganese oxides were converted from lithium manganese oxide precursor membranes by acid treatment. Precursor membranes were prepared by solvent exchange method using polyvinylidene fluoride (PVDF) and Polyether sulphone (PES) respectively as binders, powder LiMn2O4 as the precursor and N,N-dimethyl acetamide (DMAc) as the solvent. The preparation conditions were investigated by changing the binder and the concentration of powder LiMn2O4. The surfaces and morphology of membrane-type adsorbents were observated by scanning electron microscope. The comparation of the capacities of lithium desorption from precursor and adsorption for membrane-type adsorbents based on different binders shows that PVDF is more suitable to be the binder than PES with liquid film thickness of 0.25mm, and the proper concentration of PVDF and powered LiMn2O4 are respectively 12% and 60%.

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Zhu, Shu Guang, and Wen Zhi He. "Removal of Organic Impurities in Lithium Cobalt Oxide from Spent Lithium Ion Batteries by Ultrasonic Irradiation." Advanced Materials Research 864-867 (December 2013): 1937–40. http://dx.doi.org/10.4028/www.scientific.net/amr.864-867.1937.

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In the present work, spent LiCoO2 was processed to remove impurities by ultrasound with the aim to renovate its electrochemical characteristics. The composition and amount of organic materials remained in the LiCoO2 particle surface were characterized by GC-MS, FT-IR and TGA, respectively. The morphology and particle sizes of PVDF (Polyvinylidene fluoride) was analyzed by SEM. Experimental results show that ultrasonic cavitation could be effectively used to remove organic substance stuck on LiCoO2 surface. At room temperature, the spent LiCoO2 was successfully remove impurities, including EC (Ethylene carbonate) and PVDF, with ultrasound applied for 12 h. It can be considered that most of the PVDF (82.0 wt.%) has decomposed under ultrasonic irradiation. Furthermore, the EC has completely decomposed under such ultrasonic irradiation.

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Zhu, Pei, Jiadeng Zhu, Jun Zang, Chen Chen, Yao Lu, Mengjin Jiang, Chaoyi Yan, Mahmut Dirican, Ramakrishnan Kalai Selvan, and Xiangwu Zhang. "A novel bi-functional double-layer rGO–PVDF/PVDF composite nanofiber membrane separator with enhanced thermal stability and effective polysulfide inhibition for high-performance lithium–sulfur batteries." Journal of Materials Chemistry A 5, no. 29 (2017): 15096–104. http://dx.doi.org/10.1039/c7ta03301j.

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Анотація:

A novel, bi-functional double-layer reduced graphene oxide (rGO)–polyvinylidene fluoride (PVDF)/PVDF membrane was fabricated by a simple electrospinning technique and was used as a promising separator for lithium–sulfur batteries.

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Kim, Gyuyoung, Jin-Hee Noh, Horim Lee, Jaehak Shin, and Dongjin Lee. "Roll-to-Roll Gravure Coating of PVDF on a Battery Separator for the Enhancement of Thermal Stability." Polymers 15, no. 20 (October 16, 2023): 4108. http://dx.doi.org/10.3390/polym15204108.

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Анотація:

The polyethylene lithium-ion battery separator is coated with a polymer by means of a roll-to-roll (R2R) gravure coating scheme to enhance the thermal stability. The polyvinylidene fluoride (PVDF) or polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) is gravure-coated, and the pores are fabricated based on online nonsolvent-induced phase separation (NIPS). N-methylpyrrolidone is used as a solvent, and deionized water or a methanol mixture thereof is exploited as a nonsolvent in NIPS. Scanning electron microscopy confirms that the polymer film is formed and that the pores are well developed. The thermal shrinkage decreased by 20.0% and 23.2% compared to that of the bare separator due to the coating of PVDF and PVDF-HFP, respectively. The R2R gravure coating scheme is proven to be fully functional to tailor the properties of lithium-ion battery separators.

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Більше джерел

Дисертації з теми "LITHIUM /PVDF"

Eschbach, Julien. "Etude de nanocomposites hybrides en vue d'application dans les microsystèmes : de la synthèse des nanoparticules à l'élaboration de films minces piézoélectriques." Thesis, Nancy 1, 2009. http://www.theses.fr/2009NAN10104/document.

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Анотація:

L'objectif de ce travail est l'élaboration de nouveaux matériaux nanocomposites hybrides à propriétés spécifiques (piézoélectricité, optique non-linéaire). Dans un premier temps, des modèles numériques simples portant sur les propriétés mécaniques des nanocomposites sont présentées, ainsi que des simulations de déformation réalisées sur les nanocomposites à nanoparticules piézoélectriques. Les résultats expérimentaux de caractérisation mécanique (par spectrométrie Brillouin) et tribologique de différents nanocomposites sont exposés, y compris de nanocomposites réalisés au sein du laboratoire. L'influence des nanoparticules et de leur fonctionnalisation sur la matrice polymère y est discutée, et en particulier leur incidence sur les volumes libres dans les nanocomposites. Plusieurs procédés de synthèse de nanoparticules aux propriétés piézoélectriques ont parallèlement été étudiées. En particulier, un protocole de synthèse de nanoparticules de LiNbO3 a été mis au point. Ces nanoparticules ont été caractérisées par des techniques structurales, chimiques et d'imagerie. Enfin, ces travaux ont conduit à l'élaboration de films nanocomposites à matrice PVDF-TrFE incorporant des nanoparticules produites en laboratoire ou d'origine commerciale. Les méthodes de polarisation des films sont décrites, et les propriétés piézoélectriques de ces films nanocomposites ont été mesurées. Plus particulièrement, des films nanocomposites PVDF-TrFE/Al2O3 polarisés présentant une bonne réponse piézoélectrique ont été élaborés
This work aims at the elaboration of new hybrid nanocomposites with specific properties (piezoelectricity, non-linear optic). First, simple numeric modelings on mechanical properties of nanocomposites are presented, as well as simulation of deformation in nanocomposites with piezoelectric nanoparticles. Experimental results on tribological and mechanical (performed by Brillouin Spectroscopy) characterization of different nanocomposites are exposed. The influence of nanoparticles and their fonctionalization on the polymer matrix is discussed, and in particular the incidence on free volume in nanocomposites. Several piezoelectric nanoparticles synthesis processes have been also studied. In particular, a LiNbO3 nanoparticles synthesis protocol has been worked out. These nanoparticles were characterized by structural, chemical and imaging techniques. Finally, these works leads to the elaboration of PVDF-TrFE matrix thin films nanocomposites filled with commercial or produced in laboratory nanoparticles. The methods used to polarize the films are described. The piezoelectric properties of the nanocomposites have been measured. More particularly, PVDF-TrFE/Al2O3 nanocomposites thin films with a good piezoelectric response have been elaborated

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Djian, Damien. "Etude et développement de séparateurs pour une nouvelle architecture de batteries Li-ion à charge rapide." Phd thesis, Grenoble INPG, 2005. http://tel.archives-ouvertes.fr/tel-00011543.

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Анотація:

Dans le cadre du développement de technologies innovantes dans le domaine des accumulateurs Li-ion à charge rapide, typiquement inférieure à 5 minutes, des séparateurs commerciaux ont été caractérisés par différentes méthodes physico-chimiques et électrochimiques afin de corréler leurs structures poreuses aux performances en charge rapide enregistrées. L'architecture d'électrode choisie utilise l'oxyde de titane Li4Ti5O12 à l'électrode négative et le spinelle LiMn2O4 à la positive.
Afin d'augmenter les capacités chargées par rapport aux séparateurs commerciaux, des membranes à squelette poly(fluorure de vinylidène) et poly(fluorure de vinylidène) co poly(hexafluoropropylène) ont été élaborées par inversion de phase en utilisant la méthodologie des plans d'expériences. Les processus de formation ont été explicités à partir de la thermodynamique des systèmes ternaires polymère/solvant/non-solvant. Les membranes obtenues ont permis de gagner 20% de capacité chargée en 3 minutes par rapport aux séparateurs commerciaux.
Enfin, les limitations en charge rapide dues aux séparateurs ont été étudiées et identifiées à l'aide d'un code de modélisation d'accumulateurs Li-ion.

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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.

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Анотація:

碩士
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.

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Wu, Ming-Long, and 吳明龍. "The Melioration of Solid Polymer Electrolyte(PVdF-HFP) in Lithium Batteries." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/35564862101413381408.

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Анотація:

碩士
國立臺灣大學
化學工程學研究所
88
This study is focus on the melioration of PVdF-HFP(Poly (vinylidene defluoride)-co-Hexafluoropylene) polymer electrolyte. By adding some porous zeolite A、Y、ZSM-5、mordenite and MCM-41 in the electrolyte, the conductivity of it can be improved. Because the additives can adsorb a great quantity of plasticizer(EC/PC), which is a more valuable medium for the transmission of lithium ion in electrolyte. We synthesized the solid polymer electrolyte by solvent casting method. The additives in the electrolyte can be classified into three groups by the methods of pretreatment. The first group includes the fresh zeolite A、Y、ZSM-5、mordenite and MCM-41. The second contains zeolite A and Y after lithium ion exchanging procedure. The last kind of additives are these zeolites which are surface modified with CF3CH2CH2Si(OCH3)3. From a series of our study, we found that the additives zeolite A and Y can facilitate the conductivity of electrolyte more well than other additives. By the silane pre-treating procedure, the zeolites can even enhance the conducting ability of lithium ion in electrolyte, since the silane promote the dispersion of zeolites well in the organic polymer medium. At room temperature(25oC), the conductivity of the prototype electrolyte(without any additives) that we synthesized is 3.69×10-4(±0.20×10-4)S/cm. After surface modifying the fresh zeolite A by silane, the maximum conductivity we obtained is 1.20×10-3S/cm, about 3.5 times of the conductivity of the prototype electrolyte. Except electrolyte conductivity, we also investigated the mechanical strength of electrolyte by testing the relation between resistance loss and time, we found that the mechanical strength of electrolyte and the amount of additives are in direct proportion. By linear scanning voltage (LSV) testing, we can check the decomposing voltage of electrolytes. The decomposing voltage of the electrolytes that we synthesized is from 4.7V to 5.2V, which is above the average working voltage of lithium battery. That is, the electrolytes we synthesized can charge and discharge stably in the high working voltage environment of lithium battery.

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Ren-JunLiu and 劉人儁. "Synthesis of PVdF-graft-PAN as high cycle life polymer electrolyte of lithium batteries." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/2646de.

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Chen, WeiLi, and 陳韋利. "Effect of Zeolite or SiO2 Additives on Solid Polymer Electrolyte (PVdF-HFP) in Lithium Batteries." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/06988224838107907351.

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Анотація:

碩士
國立臺灣大學
化學工程學研究所
90
This study is focus on the effect of zeolite or SiO2 additives on PVdF-HFP (poly(vinylidene fluoride)-co-hexafluoropropylene). polymer electrolyte. According to Wu’s thesis, adding some porous zeolite A、Y、ZSM-5、mordenite and MCM-41 in the electrolyte, the conductivity of it can be improved. This is because the additives can adsorb a great quantity of plasticizer(EC/PC), which is a more valuable medium for the transition of lithium ion in the electrolyte. From the characterization of zeolites, such as the adsorption of plasticizer, thermal gravimetry analysis, particle size measurement, we found that a good additives should be small with uniform particle size distribution, should contain trace aluminum, and it is not necessary to be porous. In addition, some organic compound on the additives can increase the adsorption of EC/PC. However, the additives do not help the conductivity significantly when the electrolyte is rich in plasticizer (EC/PC). In this research, solvent casting method was used for making the solid polymer electrolyte. The additives studied can be classified into three groups. The first group includes the fresh zeolite A、Y、ZSM-5、mordenite. The second contains SiO2 (0.040mm-0.063mm). The last is TEOS which is used for the synthesis of small SiO2 particles in the film. It was found that the addition of SiO2 did not improve the conductivity. For TEOS, the conductivity of electrolyte seems increased. However, the films were bumpy and fragile, and did not have good mechanical strength.

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Si-XianWu and 吳思賢. "Studies on plasma modification of carbon nanotube and PVDF binder for lithium ion battery cathode." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/78964069137111649920.

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Анотація:

碩士
國立成功大學
化學工程學系碩博士班
101
In this study, we used the plasma-treated MWNT in the fabrication of lithium ion batteries cathode. After the plasma modification, entanglement in MWNT caused by MWNT’s van der Waals force could be improved and hence enhanced dispersal in solvent. At the same time, we used the plasma treatment method to prepare the binder polyvinylidene difluoride (PVDF) grafted with maleic anhydride (MA). PVDF would change the surface polarity and it could avoid MWNT from flaking off the cathode. First, we prepared the Multi-walled carbon nanotubes that have been treated by the plasma then grafted MA and methyl methacrylate (MMA) on the surface of the MWNT. Also, PVDF grafted MA by plasma modification was also prepared using similar method. There are two approaches to enhance electronic conductibility of the cathode. We dispersed CNT-MMA in NMP and well mixed with the binder PVDF-MA. The electronic conductibility of binder can be increased by CNT-MMA. Furthermore, we disperse both CNT-MA and LiFePO4 in NMP. With the electronic conductivity contributed by CNT-MA, electronic conductivity of LiFePO4 also increases. After mixing the two slurries, the cathode materials were coated onto aluminum foil followed by subsequent drying at a vacuum oven. The dried electrode was compressed by a roller at room temperature to produce a smooth and compact film structure. When the amount of CNT-MA reached 4.7%, the resistance of the cathode electrode measured by four-point probe was 0.27Ω. With well dispersed CNT, the measuring resistance on the electrode was close throughout the entire sample. Obtaining from the coin-cell testing, the first discharge capacity was 148.8mAh/g at 0.1C rate and 116mAh/g at 1C rate. And there was still 96.3% discharge capacity after the long-term stability test. To overcome the charge-transfer resistance problem in LiFePO4, we used wet ball-mill technique to decrease the particle size of LiFePO4. Thus, we could obtain the LiFePO4 with particle size of 233 nm. Using the same fabrication conditions, the cathode electrode resistance measured was about 0.3Ω. Comparing with aforementioned cathodes, the first discharge capacity enhanced to 153.9mAh/g at 0.1C rate, 120.6mAh/g at 1C rate and 103mAh/g at 2C rate, respectively. After the long-term stability test, there was still 98.4% discharge capacity. Finally, we used unmodified MWNT to replace plasma-treated MWNT. As shown from the result, we observed the promotion of plasma obviously.

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江冠廷. "Influence of Pt Nanoparticles and Fraction of PVdF on the Electrochemical Performance of Lithium Air Battery." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/73559759936387099862.

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Liao, Bo-Hao, and 廖柏豪. "Fabrication and analysis of near-field electrospinning PVDF fibers with sol-gel coating for lithium ion battery separator." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/2d259h.

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Lai, 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.

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碩士
國立臺灣大學
生物產業機電工程學研究所
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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).

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Частини книг з теми "LITHIUM /PVDF"

Jishnu, N. S., S. K. Vineeth, Akhila Das, Neethu T. M. Balakrishnan, Anjumole P. Thomas, M. J. Jabeen Fatima, Jou-Hyeon Ahn, and Raghavan Prasanth. "Electrospun PVdF and PVdF-co-HFP-Based Blend Polymer Electrolytes for Lithium Ion Batteries." In Electrospinning for Advanced Energy Storage Applications, 201–34. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8844-0_8.

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Jishnu, N. S., Neethu T. M. Balakrishnan, Akhila Das, Jarin D. Joyner, Jou-Hyeon Ahn, Fatima M. J. Jabeen, and Prasanth Raghavan. "Poly(Vinylidene Fluoride) (PVdF)-Based Polymer Electrolytes for Lithium-Ion Batteries." In Polymer Electrolytes for Energy Storage Devices, 111–32. First edition | Boca Raton : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9781003144793-5.

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Das, Akhila, Neethu T. M. Balakrishnan, N. S. Jishnu, Jarin D. Joyner, Jou-Hyeon Ahn, Fatima M. J. Jabeen, and Prasanth Raghavan. "Poly(Vinylidene Fluoride- co-Hexafluoropropylene) (PVdF-co-HFP)-Based Gel Polymer Electrolyte for Lithium-Ion Batteries." In Polymer Electrolytes for Energy Storage Devices, 133–48. First edition | Boca Raton : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9781003144793-6.

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Yang, Chun-Chen, and Zuo-Yu Lian. "Electrochemical Performance of LiNi1/3 Co1/3 Mn1/3 O2 Lithium Polymer Battery Based on PVDF-HFP/m-SBA15 Composite Polymer Membranes." In Ceramic Transactions Series, 181–202. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118771327.ch19.

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Kulova, Tatiana, Alexander Mironenko, Alexander Rudy, and Alexander Skundin. "PVD Methods for Manufacturing All-Solid-State Thin-Film Lithium-Ion Batteries." In All Solid State Thin-Film Lithium-Ion Batteries, 74–88. First edition. | Boca Raton : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429023736-3.

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Guan, Hongjian, Ruilin Yang, Yi Tao, Huilin Tai, Yuanjie Su, Yang Wang, and Weizhi Li. "Flexible Humidity Sensor Based on Polyvinylidene Fluoride." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde221203.

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Polyvinylidene fluoride (PVDF) is considered to be one of the most promising candidates for next-generation wearable sensors; however, the sensing ability of PVDF is worth expanding beyond its ferroelectricity. In this work, PVDF is used as matrix material for humidity detection by adding two other ingredients: lithium chloride (LiCl) and polyvinyl alcohol (PVA), optimal concentrations of LiCl and PVA are found by systematic investigation of the impact of the two inclusions on humidity sensing ability of the composites.

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Sanchez, Jean-Yves, Fannie Alloin, and Johanna Saunier. "PVdF-based polymers for lithium batteries." In Fluorinated Materials for Energy Conversion, 305–33. Elsevier, 2005. http://dx.doi.org/10.1016/b978-008044472-7/50042-4.

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Тези доповідей конференцій з теми "LITHIUM /PVDF"

Ren, Xumei, Hui Gu, Feng Wu, and Xuejie Huang. "Electric Properties of PVDF-HFP Microporous Membrane For Lithium Ion Battery." In Proceedings of the 7th Asian Conference. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812791979_0064.

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Zhu, Gaolong, Xiaopeng Jing, and Weidong He. "Composite MnCO3/PVDF-HFP separator towards high-performance lithium-ion batteries." In 2018 7th International Conference on Energy, Environment and Sustainable Development (ICEESD 2018). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/iceesd-18.2018.330.

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Major, K., G. Brisard, and J. Veilleux. "Lithium Iron Phosphate Coatings Deposited by Means of Inductively-Coupled Thermal Plasma." In ITSC2015, edited by A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen, and C. A. Widener. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.itsc2015p0566.

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Abstract Lithium-ion batteries have high energy efficiency and good cycling life and are considered as one of the best energy storage device for hybrid and/or electrical vehicle. Still, several problems must be solved prior to a broad adoption by the automotive industry: energy density, safety and costs. To enhance both energy density and safety, the current study aims at depositing binder-free cathode materials using inductively-coupled thermal plasma. In a first step, lithium iron phosphate LiFePO4 powders are synthesized in an inductively-coupled thermal plasma reactor and dispersed in a conventional polyvinylidene fluoride (PVDF) binder. Then, binder-free LiFePO4 coatings are directly deposited onto nickel current collectors by solution precursor plasma spraying (SPPS). These plasma-derived cathodes (with and without PVDF binder) are assembled in button cells and tested. Under optimized plasma conditions, cyclic voltammetry shows that the electrochemical reversibility of plasma-derived cathodes is improved over that of conventional sol-gel derived LiFePO4 cathodes. Further results related to the substitution of iron with manganese in the SPPS precursors (LiMPO4, where M = Fe or Mn) are discussed.

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Sathyanathan, T., C. Revathy, and C. Pugazhendhi Sugumaran. "Analysis of Liquid, PVDF-Polymer and Polymer-Nanocomposite electrolyte for Lithium Battery." In 2019 7th International Electrical Engineering Congress (iEECON). IEEE, 2019. http://dx.doi.org/10.1109/ieecon45304.2019.8938834.

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Arro, Christian, Mohammad Ibrahim Ahmad, and Nasr Bensalah. "Investigation on the effect of LiTFSI salt on PVDF-based Solid Polymer Electrolyte Membranes for Lithium-Ion Batteries." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2021. http://dx.doi.org/10.29117/quarfe.2021.0042.

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Solid polymer electrolytes provide an alternative approach to providing improved safety whilst concurrently acting as a performance enhanced separator within Lithium-ion batteries (LIBs). This investigation studies the effects of Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salts in a polymer blend with Polyvinylidene fluoride (PVDF) and Poly (vinylpyrrolidone) (PvP) or Poly (4-vinylpyridine) (P4VP) on the performance of SPE membranes. Characterization by X-ray diffraction and Fourier-transform infrared spectroscopy highlights the changes due to LiTFSI, specifically amorphization. Performance studies with increasing LiTFSI showed improved thermal stability and the inhibition of PVDF endotherms on differential scanning calorimetry (DSC) profiles. The drawbacks of increased LiTFSI content were evident on the mechanical performance with decreased thresholds on the tensile strength. Inversely, improvements on the dielectric performance and conductivity were observed with excellent workability from a wide electrochemical stability window of 0.5 to 3.64 V vs. Li+/Li. Additionally, the incorporation of metal-fillers; Aluminum Oxide, Zirconia Oxide and Silicon Oxide was similarly studied.

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Vickraman, P., A. Pandiraj, Alka B. Garg, R. Mittal, and R. Mukhopadhyay. "Provskite Structure Based Filler Impregnated Pvdf—Hfp Micro Composites For Lithium Ion Batteries." In SOLID STATE PHYSICS, PROCEEDINGS OF THE 55TH DAE SOLID STATE PHYSICS SYMPOSIUM 2010. AIP, 2011. http://dx.doi.org/10.1063/1.3606222.

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Liu, Wei, Ryan Milcarek, Kang Wang, and Jeongmin Ahn. "Novel Structured Electrolyte for All-Solid-State Lithium Ion Batteries." In ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2015 Power Conference, the ASME 2015 9th International Conference on Energy Sustainability, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/fuelcell2015-49384.

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In this study, a multi-layer structure solid electrolyte (SE) for all-solid-state electrolyte lithium ion batteries (ASSLIBs) was fabricated and characterized. The SE was fabricated by laminating ceramic electrolyte Li1.3Al0.3Ti1.7(PO4)3 (LATP) with polymer (PEO)10-Li(N(CF3SO2)2 electrolyte and gel-polymer electrolyte of PVdF-HFP/ Li(N(CF3SO2)2. It is shown that the interfacial resistance is generated by poor contact at the interface of the solid electrolytes. The lamination protocol, material selection and fabrication method play a key role in the fabrication process of practical multi-layer SEs.

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Pradeepa, P., S. Edwinraj, G. Sowmya, J. Kalaiselvimary, K. Selvakumar, and M. Ramesh Prabhu. "Composite polymer electrolyte based on PEO/Pvdf-HFP with MWCNT for lithium battery applications." In INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2015): Proceeding of International Conference on Condensed Matter and Applied Physics. Author(s), 2016. http://dx.doi.org/10.1063/1.4946448.

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MICHAEL, M. S., and S. R. S. PRABAHARAN. "AMBIENT TEMPERATURE HYBRID POLYMER ELECTROLYTE BASED ON PVK + PVDF-HFP(CO-POLYMER) FOR LITHIUM BATTERIES." In Proceedings of the 8th Asian Conference. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812776259_0026.

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Vickraman, P., R. Jayaraman, and K. Purushothaman. "Blending effect of poly (ethyl methacrylate) on lithium bis(perfluoroethanesulfonyl) imide-ferroceramic PVdF-HFP composite." In PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013. AIP, 2013. http://dx.doi.org/10.1063/1.4810080.

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Звіти організацій з теми "LITHIUM /PVDF"

Greenbaum, Steven G. Lithium Ion Transport Across and Between Phase Boundaries in Heterogeneous Polymer Electrolytes, Based on PVdF. Fort Belvoir, VA: Defense Technical Information Center, February 1998. http://dx.doi.org/10.21236/ada344887.

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