Patent number: 10367199
Abstract: 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<a?0.9, 0<d?0.1, a+b+c+d=1, M represents at least one metal element selected from the group consisting of Ti, Al, Mg, Fe, Cu, Ag, Ca, Na, K, In, Ga, Ge, V, Mo, Nb, Si and Zr.).
Type:
Grant
Filed:
September 12, 2014
Date of Patent:
July 30, 2019
Assignee:
Korea Electronics Technology Institute
Inventors:
Woosuk Cho, Jeomsoo Kim, Junho Song, Taeeun Yim, Sanggil Woo, Youngjun Kim, Kowoon Lee
Publication number: 20170077514
Abstract: 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<a?0.9, 0<d?0.1, a+b+c+d=1, M represents at least one metal element selected from the group consisting of Ti, Al, Mg, Fe, Cu, Ag, Ca, Na, K, In, Ga, Ge, V, Mo, Nb, Si and Zr.
Type:
Application
Filed:
September 12, 2014
Publication date:
March 16, 2017
Inventors:
Woosuk Cho, Jeomsoo Kim, Junho Song, Taeeun Yim, Sanggil Woo, Youngjun Kim, Kowoon Lee