Dicationic co-doped high-nickel ternary layered positive electrode material as well as preparation method and application thereof

• Main Authors: ZOU GUOQIANG, JI XIAOBO, NI LIANSHAN, HOU HONGSHUAI
• Format: Patent
• Language: Chinese; English
• Published: 29.04.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a dication co-doped high-nickel ternary positive electrode material and a preparation method thereof. The molecular formula of the positive electrode material is LiNi < x > Co < y > Mn < z > MaQ < b > O < 2 >, wherein M is at least one of Sr, Ca, Sn, Ba and Y with large ion radius; q is at least one of Zr, Ti and Ru with strong binding energy with oxygen; wherein 0.5 < = x < 1, 0 < z < = y < x, 0.001 < = a < = 0.05, 0.001 < = b < = 0.05, and x + y + z + a + b = 1. According to the invention, M and Q are added into the high-nickel ternary material, so that the problems of poor rate capability, serious attenuation of capacity and voltage in the circulation process and the like of the existing high-nickel ternary positive electrode material can be effectively solved. 本发明提供了一种双阳离子共掺杂的高镍三元正极材料及其制备方法，该正极材料的分子式为LiNixCoyMnzMaQbO2；其中，M为具有大离子半径的Sr、Ca、Sn、Ba、Y中的至少一种；Q为与氧具有强结合能的Zr、Ti、Ru中的至少一种；其中，0.5≤x＜1，0＜z≤y＜x，0.001≤a≤0.05，0.001≤b≤0.05且x+y+z+a+b＝1。本发明通过在高镍三元材料中加入M和Q，可有效克服了现有高镍三元正极材料存在的倍率性能差、循环过程中容量