Batteries and a manufacturing method of postitive active material for the batteries

摘要

This is to improve the heavy-load discharge characteristics of primary battery or to improve the high-rate discharge characteristics of secondary battery by employing manganese oxide on which a surface modified layer is formed as the positive active material wherein said surface modified layer consists mainly of an oxide of at least one element selected out of a group of titanium, cobalt, nickel, strontium, lanthanum and its compound added mainly with a compound made mainly of manganese oxide on the surface of manganese oxide powder consisting of manganese dioxide or a complex oxide of manganese and lithium by using a solution of salt of at least one element selected out of a group of titanium, cobalt, nickel, strontium, and lanthanum to which a manganese salt and a solution to which a solution of manganese salt are added.