▎ 摘　　要

NOVELTY - A lithium-iron-manganese phosphate/graphene composite material comprises a graphene sheet, and lithium-iron-manganese phosphate particles adhered to the graphene sheet. USE - Lithium-iron-manganese phosphate/graphene composite material is used in positive electrode sheet of lithium-ion battery (claimed). ADVANTAGE - The lithium-iron-manganese phosphate/graphene composite material has high electroconductivity, excellent rate performance and electrochemical performance, and can satisfy the requirements of industrial production and application. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: 1. preparation of the lithium-iron-manganese phosphate/graphene composite material, which involves ultrasonically dispersing graphite oxide in deionized water to form a graphene oxide solution, adding lithium source, iron source, manganese source, phosphorus source and complexing agent to the graphene oxide solution, stirring to form a homogeneous solution, transferring the homogeneous solution into a reactor, introducing inert gas or reducing gas, heating, stirring, maintaining the reaction temperature higher than the critical temperature of water, and the reaction pressure higher than the critical pressure of water, and continuously reacting; and 2. a lithium-ion battery.