POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, PREPARATION METHOD THEREFOR, AND LITHIUM SECONDARY BATTERY COMPRISING SAME

• Main Authors: CHOI, Moon Ho, YANG, A Reum, KANG, Ju Kyoung, HEO, Gyeong Jae, CHOI, Seung Hyun
• Format: Patent
• Language: English; French; Korean
• Published: 22.04.2021
• 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 relates to a positive electrode active material comprising an overlithiated layered oxide (OLO) and, more specifically, to a positive electrode active material comprising: an OLO represented by chemical formula 1 below; and an amorphous free oxide coating layer of an amorphous free oxide on the surface of the OLO represented by chemical formula 1. [Chemical formula 1] Li 2MnO 3·(1-r)Li aNi xCo yMn zM1 1-(x+y+z)O 2 (wherein, in chemical formula 1, 0<r≤0.6, 0<a≤1, 0≤x≤1, 0≤y<1, 0≤z<1, and 0<x+y+z≤1, and M1 is at least any 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 ). La présente invention concerne un matériau actif d'électrode positive comprenant un oxyde stratifié surlithié (OLO) et, plus précisément, un matériau actif d'électrode positive comprenant : un OLO représenté par la formule chimique 1 ci-dessous ; et une couche de revêtement d'oxyde libre amorphe d'un oxyde libre amorphe sur la surface de l'OLO représenté par la formule chimique 1. [Formule chimique 1] Li 2MnO 3·(1-r)Li aNi x Co yMn zM1 1-(x + y + z)O 2 (dans laquelle, dans la formule chimique 0 < r ≤ 0,6, 0 < a ≤ 1, 0 ≤ x ≤ 1, 0 ≤ y <1, 0 ≤ z < 1 et 0 < x + y + z ≤ 1, et M1 est au moins un élément choisi parmi 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 et Bi). 본 발명은 리튬 과잉 층상계 산화물(overlithiated layered oxide, OLO)을 포함하는 양극활물질에 관한 것으로서, 더욱 상세하게는 하기 화학식 1로 표시되는 리튬 과잉 층상계 산화물(overlithiated layered oxide, OLO); 및 상기 화학식 1로 표시되는 리튬 과잉 층상계 산화물 표면에 비정질 유리 산화물의 비정질 유리 산화물 코팅층;을 포함한다. [화학식 1] Li 2MnO 3·(1-r)Li aNi xCo yMn zM1 1-(x+y+z)O 2 (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).