COBALT OXIDE PARTICLE POWDER AND ITS PRODUCING METHOD, POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND ITS PRODUCING METHOD, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a positive electrode active material and a cobalt oxide particle powder which is its precursor and which can be used for a nonaqueous electrolyte secondary battery whose safety characteristics and, in particular, heat stability are improved by stabilizing a crystal structure in an insertion reaction of the positive electrode active material for the nonaqueous electrolyte secondary battery.

SOLUTION: The composition of the positive electrode active material for the nonaqueous electrolyte secondary battery is denoted as LiCo(1-x)MgxO2(0.001≤x≤0.15) and its mean particle diameter is 1.0-20 μm. a-Axis of the lattice constant is denoted as 0.090x+2.816COPYRIGHT: (C)2004,JPO