| abstract |
The present application relates to a positive electrode active material, including a ternary material A and a ternary material B, wherein the chemical formula of the ternary material A is Li a1 (Ni x1 Co y1 Mn z1 )O 2 , wherein 0.95≤a1≤1.2, 0.5 <x1<1, 0<y1<1, x1+y1+z1=1, the ternary material A has a polycrystalline structure; the chemical formula of the ternary material B is Li a2 (Ni x2 Co y2 Mn z2 )O 2 , where 0.95 ≤a2≤1.2, 0<x2≤0.5, 0<y2<1, x2+y2+z2=1, the ternary material B has a single crystal structure or a quasi-single crystal structure. In this application, the low-nickel single crystal material and the high-nickel polycrystalline material are mixed as the positive electrode active material, which can effectively improve the gas generation problem of the high-nickel material and the cycle performance of the battery. |