| 摘要 |
PURPOSE: To enhance low temperature discharge performance by using surface modified manganese dioxide containing 1-15 atomic percent of lithium as a positive active material and specific solvent and solute as a nonaqueous electrolyte. CONSTITUTION: Electrolytic manganese dioxide whose impurity content is preferably small and a lithium compound such as lithium hydroxide are mixed, and the mixture is baked at 150-400 deg.C to obtain surface modified manganese dioxide for a positive active material. The content of lithium in the active material obtained is 1-15 atomic percent. A mixed solvent of 20-80 volume percent of a carbonate such as ethylene carbonate 80-20 volume percent of 2- dimethoxyethane is used in a nonaqueous electrolyte. Lithium trifluoromethanesulfonate or lithium hexafluorophosphate is used as a solute. By lithium formed on the surface of manganese dioxide particle, wettability to a specific nonaqueous electrolyte is enhanced. |
