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Studies on New Materials for Battery Application by Micro-electrode Techniques

利用微电极技术研究电池应用新材料

基本信息

批准号：
06453111
负责人：
UCHIDA Isamu
金额：
$ 4.67万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06453111/
关键词：
Lithium secondary battery Lithium ion battery Battery active materials Intercalation Lithium deposition Metal hydride Micro-electrode Micro-array electrode In situ methode リチウム2次電池

项目摘要

1) Development of a new technique, micro-voltammetry targeting a single particle of redox materials in aqueous and non-aqueous systems-An experimental set-up to enable us to measure voltammograms for a single solid particle has been constructed. By using micro-manipulation techniques, the tip of a filament acting as a current lead wase contacted with a target of solid particle spread on a separator sheet soaked with an electrolyte under a microscope. Small particle experiments were carried out for metal hydrides in alkali solutions and for Li-containing layred oxides in organic solutions, and demonstrated that single particles having 10 micrometer sized were successfully made into the working electrode.2) Using the above technique, we carried out microvoltammetric studies on LaNi_5, Cl5 type Laves phase alloys and AB_5 alloys, and determined the chemical diffusion coefficients of hydrogen. This studies have been extended to LiSB materials, the layred oxides such as LiCoO_2 and LiMn_2O_4, in propylene carbonate solutions, and kinetic studies of Li-ion intercalation/deintercalation are now under investigation.3) Kinetic studies on lithium deposition/dissolution and alloy formation processes on various substrates in organic solutions were carried out by micro-disk electrodes, and kinetic parameters such as the exchange current density and diffusion coefficient have been determined as functions of temperature and solvent compositions.4) Micro-array electrodes have been applied to measure the conductivity change during Li-ion intercalation/deintercalation of LiSB cathodes. It was demonstrated that this in situ conductivity measurement with a bi-potentiostat is particularly useful in measuring both current-potential and conductivity-potential relationships simultaneously.

1）开发了一种新技术，即针对水性和非水性系统中氧化还原材料的单个颗粒的微伏安法——已经构建了使我们能够测量单个固体颗粒的伏安图的实验装置。通过使用微操纵技术，在显微镜下，充当电流引线的细丝尖端与散布在浸有电解质的隔板上的固体颗粒目标接触。对碱溶液中的金属氢化物和有机溶液中的含锂层状氧化物进行了小颗粒实验，成功地将10微米大小的单个颗粒制成了工作电极。2)利用上述技术，对LaNi_5、Cl5型Laves相合金和AB_5合金进行了微伏安研究，并测定了氢的化学扩散系数。该研究已扩展到LiSB材料、碳酸亚丙酯溶液中的LiCoO_2和LiMn_2O_4等层状氧化物，以及锂离子嵌入/脱嵌的动力学研究。3)通过微盘电极对有机溶液中各种基材上的锂沉积/溶解和合金形成过程进行了动力学研究，并进行了动力学研究。交换电流密度和扩散系数等参数已确定为温度和溶剂成分的函数。4）微阵列电极已用于测量LiSB阴极的锂离子嵌入/脱嵌过程中的电导率变化。事实证明，使用双恒电位仪进行原位电导率测量对于同时测量电流-电势和电导率-电势关系特别有用。