Spinel phase-layered phase ternary lithium ion battery positive electrode material and preparation method thereof

The invention provides a spinel phase-layered phase ternary lithium ion battery positive electrode material and a preparation method, the chemical formula of the lithium ion battery positive electrode material is LaiNixMnyCo (1-x-y) MzO2, a is more than or equal to 0.75 and less than or equal to 1.2, x is more than or equal to 0.6 and less than or equal to 0.98, y is more than or equal to 0.01 and less than or equal to 0.25, z is more than or equal to 0 and less than or equal to 0.025, and the lithium ion battery positive electrode material is of a core-shell structure; the inner core is of a spinel structure, the shell is of a layered structure, and M is a doping element of the inner core and/or the shell. According to the prepared positive electrode material, the core lithium ion de-intercalation kinetics of the positive electrode material of the lithium ion battery is improved, and a higher lithium ion migration rate is achieved, so that the material capacity and the cycling stability are improved. 本发明提供一种