US 2002/0164528 A1Published application

Lithium secondary battery

AssigneeSanyo Electric Co., Ltd.

InventorsTakuya Sunagawa, Masatoshi Takahashi, Yoshikumi Miyamoto

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Abstract

A lithium secondary battery having improved load characteristics such as high rate discharge properties is obtained by using a mixed cathode active material comprising a mixture of lithium-containing manganese oxide having a spinel type crystal structure and lithium-containing cobalt oxide, wherein the cathode collector retains mixed cathode active material in such a manner that the mixing ratio of lithium cobaltate X thereof should fall in a range of 0.1≦X≦0.9, that the bulk density Y (g/cm3) of the cathode mixed agent should be confined in a range satisfying the relation of 0.5X+2.7≦Y≦0.6X+3.3, and that the mean particle diameter of spinel type lithium manganate should be greater than the mean particle diameter of lithium cobaltate.

Claims8

Dependent claims

A lithium secondary battery comprising a cathode containing a cathode active material capable of intercalating and deintercalating lithium ions, an anode containing an anode active material capable of intercalating and deintercalating lithium ions, and a non-aqueous electrolyte, wherein

said cathode comprises, retained on a cathode collector, a cathode mixed agent based on a mixed cathode active material comprising a mixture of lithium cobaltate and a spinel type lithium manganate;
provided that the mixed cathode active material contains lithium cobaltate at a mass ratio X in a range of not lower than 0.1 but not higher than 0.9;
that the cathode mixed agent is retained on the cathode collector in such a manner that the bulk density Y (g/cm3) should fall in a range not lower than 0.5X+2.7 but not higher than 0.6X+3.3;
and
that the mean particle diameter of the spinel type lithium manganate is larger than the mean particle diameter of the lithium cobaltate.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/079,590Filed 22 Feb 2002
Priority: JP P.2001-4789123 Feb 2001
Published: 7 Nov 2002
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

H01M 4/131
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…
C01G 45/1242
Manganates or manganites with trivalent manganese, tetravalent manganese or mixtures thereof: of the type -, e.g. LiMn2O4 or LiO4
C01G 51/54
Containing manganese: of the type -, e.g. LiO4 or LiO4
C01G 53/54
Containing manganese: of the type -, e.g. LiO4 or LiO4