Ratner & Prestia
Method of manufacturing positive active material for batteries
 Heavy-load discharge characteristics of a primary battery are improved. Alternatively, the high-rate discharge characteristics of a secondary battery are improved. This is accomplished by employing manganese oxides as the positive active material on which a surface modified layer is formed. The surface modified layer consists of an oxide of at least one element selected from the group consisting of titanium, cobalt, nickel, strontium, lanthanum and its compound added mainly with a compound made of manganese oxide on the surface of manganese oxide powder consisting of manganese dioxide or a complex oxide of manganese and lithium. This is accomplished by using a solution of salt of at least one element selected from the group consisting of titanium, cobalt, nickel, strontium, and lanthanum to which a manganese salt and a solution, to which a solution of manganese salt are added. 
Matsushita Electric Industrial Co., Ltd.
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Seiji Hiroshi Takuya Jun
Tao Yoshizawa Nakashima Nunome