▎ 摘　　要

NOVELTY - Preparing composite material precursor involves providing hydrogel containing tin salt, aluminum salt, graphene oxide, nickel cobalt manganese ternary material, and drying hydrogel to obtain final product. USE - Method for preparing composite material precursor for composite material used in anode material preparation (all claimed) in the field of lithium ion battery used in electric vehicle and hybrid power. ADVANTAGE - The method enables to provide the composite material precursor, which has porous structure, increase electrolyte liquid absorption amount, and provides buffer space for expansion of composite material in charging and discharging process to improve circulation performance, The characteristics of stability and strong electrical conductivity are coated on the surface of nickel-cobalt-manganese ternary material to form aluminum oxides when aluminum salt itself has a structure, which improves cycle performance and rate performance of composite material, and high porosity of tin salt is coated on the surface of nickel-cobalt-manganese ternary material. The formation of nickel oxide improves ion transport ability and liquid retention ability of composite material to improve its cycle performance, and graphene oxide further improves electrical conductivity of composite material. The composite material significantly improves electrical conductivity of composite material, and has good application prospects in the field of cathode material preparation for lithium ion batteries. The composite material has stable porous structure, high electrolyte storage capacity and good cycle performance and rate capability, so that anode plate obviously improves electrochemical performance of lithium ion battery. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a composite material precursor, which is prepared by method for preparing composite material precursor; (2) a composite material, which comprises nickel-cobalt-manganese ternary material and coating layer coated on the surface of nickel-cobalt-manganese ternary material, where coating layer comprises aluminum oxide, tin oxides and graphene oxide; (3) a method for preparing composite material, which involves providing the composite material precursor, dispersing composite material precursor in organic solvent, spray-drying, and calcining at a temperature of 600-900degrees Celsius for 1-12 hours to obtain composite material; and (4) a positive plate, which comprises current collector and positive electrode material arranged on current collector, where positive electrode material is composite material. DESCRIPTION OF DRAWING(S) - The drawing shows a SEM image of the composite material. Providing hydrogels containing tin salts, aluminum salts, graphene oxide and nickel-cobalt-manganese ternary materials (S01) Drying hydrogel to obtain composite material precursor (S02)