Manganese Oxides by co-precipitation method, Spinel type cathode active material for lithium secondary batteries using thereby and Preparation of the same

摘要

Provided are a manganese oxide prepared by using coprecipitation, its preparation method, a spinel type positive electrode active material for a lithium secondary battery which is high in structural stability at a high temperature and is improved in volume energy density, and its preparation method. The manganese oxide comprises Mn3O4 prepared by coprecipitation and is a monodisperse spherical powder. Preferably the manganese oxide has a particle size of 5-15 micrometers and a tap density of 2.5 g/cc or more. The spinel type positive electrode active material has a composition represented by Li_(1+alpha)[Mn_(2-alpha)]O4, wherein 0<=alpha<=0.15. Also the spinel type positive electrode active material has a composition represented by Li_(1+ alpha)[Mn_(2-alpha)]O_(4-z)F_z, wherein 0<=alpha<=0.15; and 0.01<=z<=0.15.