| 摘要 |
PROBLEM TO BE SOLVED: To enlarge the specific electric capacity and improve the battery characteristics after continuous charging by preparing a lithium-containing manganese composite oxide in which the elusion amount of lithium into water has a specific value and the degree of oxidation has a specific level, and forming a positive electrode which contains this manganese composite oxide as active material. SOLUTION: A positive electrode 2 is contained in a positive electrode can 1, and a non-aqueous electrolyte using an inductive solvent for dissolving the electrolyte is hold impregnatedly by a separator 3 installed on the positive electrode 2. The positive electrode 2 is formed from a lithium-containing manganese composite oxide as an active material whose lithium elusion amount into water is below 0.3wt.% and degree of oxidation is over 1.87, an electrcoconductive assistant such as graphite, and a binder such as polytetrafluoroethylene, though such a procedure that the mixture thereof is subjected to a pressure molding process. Thereby lithium ion elusion to the electrolytic solution is suppressed in the positive electrode 2 so that the reaction with the electrolytic solution is inhibited, and gas generation can be prevented and the specific electric capacity by enlarged. The resultant lithium secondary battery incorporating this positive electrode 2 has a high electric capacity and also improved battery characteristics after continuous charging. |
