POSITIVE ELECTRODE ACTIVE MATERIAL FOR USE IN NON-AQUEOUS LITHIUM SECONDARY BATTERY AND METHOD OF FABRICATING IT

摘要

PROBLEM TO BE SOLVED: To provide a positive electrode active material for a non-aqueous lithium secondary battery that has high output discharge characteristics and stable cycle characteristics with long life and with compact size. SOLUTION: A lithium secondary battery comprises a positive electrode coated with a lithium and manganese complex compound of spinel structure as the active material. The lithium and manganese complex compound consists of primary particles, and secondary particles obtained by condensing the primary particles. The active material applied to the positive electrode as the electricity collector has a density of 2.5 g/cm3 or more after formed under pressure. The primary particles are in a size range of 1-20 μm with the maximum to minimum particle size ratio equal to or greater than 3.0.