Positive electrode active material for lithium ion secondary battery
AssigneeNichia Corporation
InventorsTakeshi Takahashi, Masuhiro Morizaki, Atsushi Takeoka, Junichi Tokuno
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Abstract
Disclosed is a positive electrode active material for a lithium ion secondary battery, including lithium-transition metal composite oxide of a layer crystal structure, in which the lithium-transition metal composite oxide contains an element that improves conductivity of electrons in the lithium-transition metal composite oxide. Use of this positive electrode active material can improve cycle characteristics, high rate characteristics and thermal stability of lithium ion secondary batteries. Furthermore, by use of this positive electrode active material, gas generation in batteries can be decreased.
Claims1
A positive electrode active material for a lithium ion secondary battery expressed by general formula:
- LivCo1-xM1wM2xOySz
- (wherein M1 represents Al or Ti;
- M2 represents Mg and/or Ba;
- v represents a number satisfying 0.95≦v≦1.05;
- w represents 0, or a number satisfying 0<w≦0.10 when M1 is Al or a number satisfying 0<w≦0.05 when M1 is Ti;
- x represents a number satisfying 0<x≦0.10;
- y represents a number satisfying 1≦y≦2.5;
- and z represents a number satisfying 0<z≦0.015).
Dependencies are inferred from the claim text.