Patent ID: 8852806
Filing Date: 2014-10-07
Classification: H01M,Y02E,Y02T,Y10S

Abstract:
1. A cathode active material for secondary batteries for reducing deintercalation of oxygen from a crystal structure at a high voltage of 4.3V to 4.6V through incorporation of excessive lithium in a cation layer composed of Ni and in a cation layer composed of Mn, the cathode active material being represented by Formula 1: wherein 0<x<0.3; 0<a<0.2; 0≦b≦0.2; M is at least one element selected from Ni and Mn; M′ is a transition metal excluding Ni and Mn; and M″ is at least one element selected from Mn, Sn and Ti, wherein the compound of Formula 1 is a composite or solid solution with a layered structure.