Patent ID: 7309543
Filing Date: 2007-12-18
Classification: C01G,C01P,H01M,Y02E,Y10T

Abstract:
1. A layered lithium-nickel-based compound oxide powder for a positive electrode material for a lithium secondary cell, which is represented by the following formula (1), wherein: said powder comprises secondary particles, said secondary particles are agglomerates of primary particles, said powder has a bulk density of at least 2.0 g/cc, said primary particles have an average primary particle size B of from 0.1 to 1 μm, said secondary particles have a median diameter A of from 9 to 20 μm, and the ratio A/B of said median diameter A of said secondary particles to said average primary particle size B, is within a range of from 10 to 200: wherein 0≦x≦0.20, 0.1≦y≦0.5, 0.1≦z≦0.5, 0≦p≦0.2, 0.2≦y+z+p≦0.8, and M is at least one member selected from the group consisting of Al, Fe, Ti, Mg, Cr, Ga, Cu, Zn, Nb and Zr.