NICKEL-COBALT-MAGANESE-BASED COMPOUND PARTICLES AND PROCESS FOR PRODUCING THE NICKEL-COBALT-MANGANESE-BASED COMPOUND PARTICLES, LITHIUM COMPOSITE OXIDE PARTICLES AND PROCESS FOR PRODUCING THE LITHIUM COMPOSITE OXIDE PARTICLES, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

The present invention relates to nickel-cobalt-manganese-based compound particles which have a volume-based average secondary particle diameter (D50) of 3.0 to 25.0 μm, wherein the volume-based average secondary particle diameter (D50) and a half value width (W) of the peak in volume-based particle size distribution of secondary particles thereof satisfy the relational formula: W≦̸0.4×D50, and can be produced by dropping a metal salt-containing solution and an alkali solution to an alkali solution at the same time, followed by subjecting the obtained reaction solution to neutralization and precipitation reaction. The nickel-cobalt-manganese-based compound particles according to the present invention have a uniform particle size, a less content of very fine particles, a high crystallinity and a large primary particle diameter, and therefore are useful as a precursor of a positive electrode active substance used in a non-aqueous electrolyte secondary battery.