POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND METHOD FOR PRODUCING THE SAME, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY USING THE POSITIVE ELECTRODE ACTIVE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a positive electrode active material low in an internal resistance, excellent in output characteristics and high in capacity when used as a positive electrode material for a nonaqueous electrolyte secondary battery.

SOLUTION: The positive electrode active material comprises substantially spherical secondary particles that comprise primary particles of a Li-Ni complex oxide represented by general formula: Li1+zNi1-x-yCoxTiyO2(0.10≤x≤0.21, 0.01≤y≤0.08 and -0.05≤z≤0.10) and have an average particle diameter of 1.0-4.0 μm and a size distribution width sd of 2.0 or less. The positive electrode active material is obtained by mixing a Ni-Co complex oxide particles with a Li compound and a Ti compound and firing at a temperature of 690-750°C, the Ni-Co complex oxide particles with an average particle diameter of 1.0-4.0 μm being obtained by roasting a compound containing Ni and Co in solution.

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