▎ 摘　　要

NOVELTY - Method comprises (a) slowly adding hydrogen phosphate solution dropwise to iron solution under stirring conditions, adding ammonia, transferring mixed solution to a reaction kettle lined with polytetrafluoroethylene, performing hydrothermal reaction, cooling, subjecting reaction product to suction filtration, washing, vacuum drying, and preparing lithium iron phosphate; (b) adding graphene oxide solution to ethanol solution, stirring, adding ethyl orthosilicate, centrifuging mixed solution, and synthesizing graphene oxide-silicon dioxide using hydrolysis of ethyl orthosilicate to generate silicon dioxide and deposit on graphite oxide to obtain graphene oxide-silicon dioxide composite material; (c) adding iron phosphate precursor solution into solution, transferring mixed solution into polytetrafluoroethylene, reacting and calcining to obtain composite cathode material; and (d) preparing coin-type lithium-ion battery using composite cathode material. USE - The method for preparing lithium iron phosphate cathode material modified by graphene-silicon dioxide is useful in lithium-ion battery. ADVANTAGE - The material uses the synthesized graphene oxide-silicon dioxide to modify lithium iron phosphate, improves the conductivity of the lithium iron phosphate, has better cycle and multiplying power performance, and long-term stability.