Precursor material with multi-layer structure, preparation method of precursor material, positive electrode material and lithium ion battery

The invention belongs to the technical field of lithium ion battery materials, and discloses a precursor of a lithium ion battery positive electrode material. The inner core of the precursor is nickel-cobalt-manganese hydroxide, the outer side of the inner core is of a multi-layer structure formed by lanthanum-aluminum-iron-chromium-magnesium-zinc hydroxide and nickel-cobalt-manganese hydroxide alternately, and the innermost layer and the outermost layer of the multi-layer structure are the lanthanum-aluminum-iron-chromium-magnesium-zinc hydroxide. In addition, the invention discloses a coprecipitation method preparation process of the precursor. The surface of the nickel-cobalt-manganese hydroxide is coated with the lanthanum-aluminum-iron-chromium-magnesium-zinc hydroxide, and the lanthanum-aluminum-iron-chromium-magnesium-zinc hydroxide is used as a repeated component unit to form a precursor. After the precursor with the structure is mixed with lithium and sintered, the hydroxide of lanthanum, aluminum, i