CATHODE ACTIVE MATERIAL, LITHIUM SECONDARY BATTERY HAVING SAME, AND METHOD FOR PREPARING SAME

摘要

The present invention relates to a cathode active material, a lithium secondary battery having the same, and a method for preparing the same, and the purpose of the present invention is to provide battery properties and thermal stability under a high temperature environment even if the Ni content of M in LiMO2(M=Ni, Co, Ti, Zr, etc.) of layered oxide is increased to 65% or more. The present invention provides a cathode active material for a lithium secondary battery which is represented by chemical formula 1 below and is obtained by substituting a part of Ni, Co and Mn for a dissimilar metal (M) through heat treatment with a lithium source after coating the dissimilar metal (M) on the surface of a transition metal precursor comprising Ni, Co and Mn.;LiNiaCobMncMdO2   [Chemical Formula 1];(0.6

主权项

1. A cathode active material for lithium secondary batteries which is represented by Chemical Formula 1 below and is obtained by coating a dissimilar metal (M) on a surface of a transition metal precursor comprising Ni, Co and Mn and then heat-treating the transition metal precursor together with a lithium source so that a portion of Ni, Co and Mn is substituted with the dissimilar metal (M):
LiNiaCobMncMdO2   [Chemical Formula 1] wherein 0.6