Process for producing positive electrode active material for...

Details Process for producing positive electrode active material for... Process for producing positive electrode active material for...

2007-03-20

2007-03-20

Ryan, Patrick Joseph (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode or plural tablets, pellets or discs

C429S209000, C429S231300, C429S231950

Reexamination Certificate

active

11136493

ABSTRACT:
To provide a process for producing a lithium-cobalt composite oxide for a positive electrode of a lithium secondary battery, which has a large volume capacity density, high safety, high charge and discharge cycle durability, high press density and high productivity.A process for producing a lithium-cobalt composite oxide represented by the formula LipCoxMyOzFa(wherein M is a transition metal element other than Co, or an alkaline earth metal element, 0.9≦p≦1.1, 0.980≦x≦1.000, 0≦y≦0.02, 1.9≦z≦2.1, x+y=1, and 0≦a≦0.02), characterized in that as a cobalt source, a mixture is used which comprises cobalt hydroxide in the form of substantially spherical secondary particles with an average particle size of from 8 to 20 μm formed by agglomeration of primary particles and tricobalt tetroxide in the form of secondary particles with an average particle size of from 2 to 10 μm formed by agglomeration of primary particles, in a cobalt atomic ratio of from 5:1 to 1:5, and firing is carried out at from 700 to 1,050° C.

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