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Study on Diffusion of Lithium Ion in Solid and Development of Lithium Secondary Battery

锂离子在固体中的扩散研究及锂二次电池的开发

基本信息

批准号：
63430015
负责人：
TAKEHARA Zen-ichiro
金额：
$ 21.31万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

Electronically conductive polymers, such as polyacetylene, have attracted considerable attention due to their potential application to lithium secondary battery. The diffusion coefficients of various anions, BF^-_, C10^-_, and PF^-_, in polyacetylene was estimated. The diffusion of polyacetylene was treated by a cylindrical finite diffusion model. The diffusion coefficients of the anions were estimated as 2-4x10^<-14> cm^2s^<-1>. This results suggested that the rate determining step on charge or discharge of polyacetylene electrode was the anion diffusion process.The discharge reaction of FeOCl was investigated and the discharge products have been identified by XRD and EPMA. At high concentrations of lithium, FeOCl co-intercalated by lithium and solvent gradually decomposed to yield Fe and other compounds. On the other hand, FeOCl modified by the intercalation of basic organic compounds, such as 4-aminopyridine or 2-vinylpyridine, is high enough to stabilize the structure of FeOCl during the discharge.Ultra-thin, uniform, pinhole-free solid polymer electrolyte films of approximately 1 mum thickness were prepared by the complexation of plasma-polymerized tris(2-methoxyethoxy)vinylsilane with lithium perchlorate. Room temperature conductivities greater than 10^<-6> S cm^<-1> (10^2 OMEGA cm^2: resistance per unit area) were observed.A thin solid-state lithium battery was fabricated using thin film of TiS_2 (10-15 mum) prepared by chemical vapor deposition (CVD) as a cathode active material, a thin solid polymer electrolyte film (-2 mum) prepared by plasma polymerization, and a thin film of lithium deposited by thermal evaporation.

导电聚合物，如聚乙炔，由于其在锂二次电池中的潜在应用而引起了相当大的关注。计算了不同阴离子BF^-_、C_（10）^-_和PF^-_在聚乙炔中的扩散系数。用圆柱有限扩散模型处理聚乙炔的扩散。阴离子的扩散系数估计为2- 4x 10 ^<-14>cm ^2s ^<-1>。研究了FeOCl在聚乙炔电极上的放电反应，并用XRD和EPMA对放电产物进行了表征。在高浓度的锂，FeOCl共插层的锂和溶剂逐渐分解，产生铁和其他化合物。另一方面，FeOCl改性的插层的基本有机化合物，如4-氨基吡啶或2-乙烯基吡啶，是足够高的稳定结构的FeOCl在discharge.超薄，均匀，无针孔的固体聚合物电解质膜约1 μ m的厚度制备等离子体聚合的三（2-甲氧基乙氧基）乙烯基硅烷与高氯酸锂的络合。室温电导率大于10^<-6>S cm^2<-1>（10 ^2 Ω cm ^2：单位面积电阻）。使用通过化学气相沉积（CVD）制备的TiS_2薄膜（10-15 μ m）作为阴极活性材料、通过等离子体聚合制备的薄固体聚合物电解质膜（~ 2 μ m）和通过热蒸发沉积的锂薄膜来制造薄固态锂电池。