09-06-2022 дата публикации
Номер: US20220181622A1
This application discloses a positive electrode active material, including secondary particles and a coating layer applied on an exterior surface of each of the secondary particles, where the secondary particle includes a lithium transition metal oxide that contains a doping element M, the coating layer includes an oxide of element M, Mis selected from one or more of Si, Ti, Cr, Mo, V, Ge, Se, Zr, Nb, Ru, Rh, Pd, Sb, Te, Ce, and W, and Mis selected from one or more of Mg, Al, Ca, Ce, Ti, Zr, Zn, Y, and B; a relative deviation of local mass concentration of element Min the secondary particle is less than 20%; and the secondary particle from the core to the exterior surface of the particle includes a plurality of layers of primary particles arranged along radial direction of the secondary particle. 1. A positive electrode active material , comprising secondary particles and a coating layer applied on an exterior surface of each of the secondary particles , wherein the secondary particle comprises a lithium transition metal oxide , the coating layer comprises an oxide of element M , and the positive electrode active material satisfies a chemical formula (1):{'br': None, 'sub': 1+a', 'x', 'p', 'z', 'b', 'c', '2-d', 'd, 'sup': 1', '2, 'Li[NiCoMnMM]OX\u2003\u2003chemical formula (1)'}{'sup': 1', '1', '2', '2, 'wherein in the chemical formula (1), Mis an element doped in a transition metal site of the lithium transition metal oxide, Mis selected from one or more of Si, Ti, Cr, Mo, V, Ge, Se, Zr, Nb, Ru, Rh, Pd, Sb, Te, Ce, and W, X is an element doped in an oxygen site of the lithium transition metal oxide, X is selected from one or more of F, Cl, Br, I, S, N, and P, Mis an element of the coating layer, Mis selected from one or more of Mg, Al, Ca, Ce, Ti, Zr, Zn, Y and B, 0.5≤x<1, 0
Подробнее
