CATHODE ACTIVE MATERIAL FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY AND MANUFACTURING METHOD THEREOF

摘要

The purpose of the present invention is to easily provide at low cost, a cathode active material for non-aqueous electrolyte secondary batteries, which exhibits high particle strength and high weather resistance, while enabling achievement of excellent charge and discharge capacity and excellent output characteristics in cases where the cathode active material is used as a cathode material of a non-aqueous electrolyte secondary battery. A slurry of from 500 g/L to 2000 g/L is formed by adding water to a powder of a lithium nickel composite oxide represented by the general formula (A): LizNi1-x-yCoxMyO2, where 0.10≦x≦0.20, 0≦y≦0.10, 0.97≦z≦1.20, and M represents at least one element selected from among Mn, V, Mg, Mo, Nb, Ti and Al); the slurry is washed with water by stirring; and after filtration, the resulting material is subjected to a heat treatment at a temperature of from 120° C. to 550° C. (inclusive) in an oxygen atmosphere having an oxygen concentration of 80% by volume or more.

主权项

1. A manufacturing method for manufacturing a cathode active material for a non-aqueous electrolyte secondary battery, comprising steps of: forming a 500 g/L to 2000 g/L slurry by adding water to a powder of a lithium nickel composite oxide that is represented by a general formula (A): LizNi1-x-yCoxMyO2, where 0.10≦x≦0.20, 0≦y≦0.10, 0.97≦z≦1.20, and M is at least one element that is selected from among Mn, V, Mg, Mo, Nb, Ti and Al; washing the slurry by mixing; filtering the slurry; and performing heat treatment at a temperature of no less than 120° C. and no greater than 550° C. in an oxygen atmosphere having an oxygen concentration of 80% by volume or more.