| 摘要 |
PURPOSE:To increase high rate discharge capacity by using a three components system mixture solvent comprising 40-80vol.% specified one, kind of high boiling point solvent and 5-50vol.% each of specified two kinds of low boiling point solvents as an aprotic solvent. CONSTITUTION:An aprotic solvent consists of 40-80vol.% one kind of solvent selected from ethylene carbonate (238 deg.C) and propylene carbonate (241 deg.C) and the like as a high boiling point solvent and 5-50vol.% each of two kinds of solvents selected from 1,2-dimethoxyethane (84 deg.C), 1,2-diethoxyethane (118 deg.C) and the like as a low boiling point solvent. An electrolyte comprising this aprotic solvent and an electrolyte salt is impregnated. A film with no electronic conductivity such as Li2O film is difficult to form on the interface between a negative electrode and a gel state electrolyte. Since capacity drop in high rate discharge is difficult to occur compared with the existing battery, high rate discharge capacity is increased. |
