Positive electrode active material for nonaqueous...

Details Positive electrode active material for nonaqueous... Positive electrode active material for nonaqueous...

2007-11-13

2007-11-13

Ryan, Patrick Joseph (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

C429S231500, C429S231600, C429S231700, C429S231950

Reexamination Certificate

active

10846694

ABSTRACT:
Disclosed is a positive electrode active material for a nonaqueous electrolyte secondary battery containing at least a lithium-transition metal composite oxide of a spinel structure, in which at least one kind of element which may become tetravalent exists on at least a surface of the lithium-transition metal composite oxide, and concentration of the element which may become tetravalent on the surface of the lithium-transition metal composite oxide is higher than concentration of the element which may become tetravalent inside the lithium-transition metal composite oxide. A use of this positive electrode active material can improve cycle characteristics and high rate characteristics without reducing the charge-discharge capacity of the lithium-transition metal composite oxide.

REFERENCES:
patent: 6368750 (2002-04-01), Nemoto et al.
patent: 6489060 (2002-12-01), Zhang et al.
patent: A 09-035715 (1997-02-01), None
patent: A 09-092257 (1997-04-01), None
patent: A 2000-90933 (2000-03-01), None
patent: A 2000-128539 (2000-05-01), None
patent: A 2001-6678 (2001-01-01), None
patent: A 2001-185146 (2001-07-01), None

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