| 摘要 |
PROBLEM TO BE SOLVED: To make a film hardly formed, which interferes with discharge, and is poor in electron conductivity, over the surface of a negative electrode, and also make a charge and discharge efficiency high. SOLUTION: In this cell, solvent for non-aqueous electrolyte is made up of 25 to 100% ethylene carbonate by volume, 0 to 75% propylene carbonate and/or butylene carbonate by volume, and of 0 to 75% dimethoxyethane by volume, solute of non-aqueous electrolyte is lithium trifluoromethanesulfonate or lithium hexafluorophosphate, and furthermore, as positive electrode active material, manganese dioxide is used, which is heat-treated at 250 to 325 deg.C or 435 to 475 deg.C. |
