| 摘要 |
PURPOSE:To provide a 4V-class nonaqueous electrolyte secondary battery excellent in high temperature reservation. CONSTITUTION:A positive electrode 1 uses at least one composite oxide selected of LiMn2O4, LiC0O2, LiNiO2 and LiFeO2 groups as positive electrode active material and a negative electrode 4 uses metal lithium or reversibly occluded and discharged lithium. Nonaqueous electrolyte is such that lithium fluoride or phosphatic lithium hexafluoride as solute is solved in mixed solvent of ethylene carbonate, 1, 2-dimethoxyethane and propylene carbonate. In this way, combined nonaqueous electrolyte as above-mentioned has almost no capacity decrease in reservation at a high temperature of 60 deg.C, compared with others, and is free from freeze at -20 deg.C, thus to provide a nonaqueous electrolyte secondary battery excellent in high temperature reservation property and low temperature property. |
