| 摘要 |
PROBLEM TO BE SOLVED: To decrease initial irreversible capacity, and to enhance the cycle characteristics and capacity by bringing a negative electrode raw material into contact with a solution prepared by dissolving alkali metals or an alkaline earth metals in an amine compound solvent to adsorb these metals. SOLUTION: As alkali metals or alkaline earth metals used, Li, Na, K, and Ca are preferable. As a solvent for dissolving these metals, use of an amine compound that does not lose a reducing function of metal by reaction is essential, and use of ethylamine and ethylene diamine is especially preferable. The concentration of metal in a metal solution is usually 2-10 wt.%. As a negative electrode raw material, composite tin oxide and composite silicon oxide are especially preferable. In order to bring the negative electrode raw material into contact with a solution of metal such as an alkali metal, for example, a reaction bath with stirring blades is used to mix a solid with liquid. |
