| 摘要 |
PURPOSE:To increase high rate discharge capacity by using a specified composition of mixture solvent as an aprotic solvent. CONSTITUTION:As an aprotic solvent, a ternary system mixture solvent comprising-5-50vol.% each of specified two kinds of high boiling point solvents and 10-50vol.% specified one kind of low boiling point solvent is used. As the high boiling point solvent, 5-50vol.% each of two kinds of solvents selected from ethylene carbonate (238 deg.C), propylene carbonate. (241 deg.C), and butylene carbonate 240 deg.C) are used. As the low boiling point solvent, 10-50vol.% one kind of solvent selected from 1,2-dimethoxyethane (84 deg.C) and 1,2-diethoxyethane (118 deg.C) is used. A film of Li2O with no electronic conductivity is difficult to form on the interface between a negative electrode and a polymer gel state electrolyte, and the contact resistance on the interface is decreased. Since capacity drop in high rate discharge is difficult to occur compared with the existing battery, high rate discharge capacity is increased. |
