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

Patent 5744266 Issued on April 28, 1998. Estimated Expiration Date:

January 31, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

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Inventors

Assignee

Matsushita Electric Industrial Co., Ltd.

Application

No. 791586 filed on 01/31/1997

US Classes:

429/224Manganese component is active material

Examiners

Primary: Skapars, Anthony

Attorney, Agent or Firm

Ratner & Prestia

Foreign Patent References

61-237366 JP. 10/13/1986
WO 93/18557 WO. 09/13/1993

International Class

H01M 004/50

Foreign Application Priority Data

1996-02-02 JP

Abstract

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.