Publication number: 20200381719
Abstract: A positive electrode active material includes a center portion including a first lithium transition metal oxide with an average composition represented by Formula 1, Li1+a1(Nib1Coc1Mnd1Ale1M1f1)O2??[Formula 1] wherein, in Formula 1, ?0.1?a1?0.2, 0.8?b1<1.0, 0<c1?0.2, 0<d1?0.1, 0<e1?0.05, 0?f1?0.05, b1/c1?25, and b1/d1?20, and M1 includes at least one selected from the group consisting of Mg, Ti, Zr, Nb, and W, and a surface portion including a second lithium transition metal oxide with an average composition represented by Formula 2, Li1+a2(Nib2Coc2Mnd2Ale2M1f2)O2??[Formula 2] wherein, in Formula 2, ?0.1?a2?0.2, 0.6?b2?0.95, 0<c2?0.2, 0<d2?0.1, 0<e2?0.05, 0?f2?0.05, b2/c2<13, and b2/d2?3, and M1 includes at least one selected from the group consisting of Mg, Ti, Zr, Nb, and W.
Type:
Application
Filed:
January 2, 2019
Publication date:
December 3, 2020
Applicant:
LG Chem, Ltd.
Inventors:
Byung Chun Park, Ji Hye Kim, Jung Min Han, Wang Mo Jung