Lithium secondary battery cathode active material manufacturing method thereof and lithium secondary battery comprising the same

• Main Authors: YANG A REUM, CHOI MOON HO, LIM RA NA, HEO GYEONG JAE, CHOI SEUNG HYUN
• Format: Patent
• Language: English; Korean
• Published: 01.08.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present invention comprises: over-lithiated layered oxide represented by formula 1; and an ion-conductive coating layer formed on a surface of the over-lithiated layered oxide represented by formula 1. The formula 1 is represented by rLi_2MnO_3 ·(1−r)Li_aNi_xCo_yMn_zM1_(1−(x+y+z))O_2, wherein r, a, x, y, and z satisfy 0 < r < 0.6, 0 < a < 1, 0 < x < 1, 0 < y < 1, 0 < z < 1, and 0 < x+y+z ⟨= 1, and M1 comprises at least one selected from Na, K, Mg, Al, Fe, Cr, Y, Sn, Ti, B, P, Zr, Ru, Nb, W, Ba, Sr, La, Ga, Mg, Gd, Sm, Ca, Ce, Fe, Al, Ta, Mo, Sc, V, Zn, Cu, In, S, B, Ge, Si, and Bi. The present invention is capable of improving lithium-ion conductivity in the over-lithiated layered oxide. 본 발명은 하기 화학식 1로 표시되는 리튬 과잉 층상계 산화물; 및 상기 화학식 1로 표시되는 리튬 과잉 층상계 산화물 표면에 이온전도성 코팅층;을 포함한다. [화학식 1] rLi2MnO3·(1-r)LiaNixCoyMnzM11-(x+y+z)O2 (상기 화학식 1에서 0<r≤0.6, 0<a≤1, 0≤x≤1, 0≤y<1, 0≤z<1, 및 0<x+y+z≤1 이고, 상기 M1은 Na, K, Mg, Al, Fe, Cr, Y, Sn, Ti, B, P, Zr, Ru, Nb, W, Ba, Sr,La, Ga, Mg, Gd, Sm, Ca, Ce, Fe, Al, Ta, Mo, Sc, V, Zn, Cu, In, S, B , Ge, Si 및 Bi 중에서 선택되는 적어도 어느 하나 이상임).