▎ 摘　　要

NOVELTY - Method for synthesis of lithium iron manganese phosphate/carbon-at-graphene composite material involves (a) adding the graphene dispersion to dimethylformamide and heating the water bath at 70-90 degrees C, (b) according to the stoichiometric ratio of lithium complex, adding lithium source, iron source, manganese source, phosphorus source, and citric acid to the obtained solution, magnetically stirring for 15-30 minutes, hydrothermally reacting the mixed solution to a reactor at 150-170 degrees C for 48-72 hours, (c) completing the reaction, centrifuging to wash and collect the sediment, and drying, and (d) in an inert gas atmosphere, sintering the dried product and crystallizing to obtain the material. USE - The composite material is useful as a positive electrode material for a lithium ion battery (claimed). ADVANTAGE - The material has improved electrical conductivity. DETAILED DESCRIPTION - Method for synthesis of lithium iron manganese phosphate/carbon-at-graphene composite material involves (a) adding the graphene dispersion to dimethylformamide and heating the water bath at 70-90 degrees C, (b) according to the stoichiometric ratio of lithium complex of formula: LiFe1-xXMnxPO4, adding lithium source, iron source, manganese source, phosphorus source, and citric acid to the obtained solution, magnetically stirring for 15-30 minutes, hydrothermally reacting the mixed solution to a reactor at 150-170 degrees C for 48-72 hours, (c) completing the reaction, centrifuging to wash and collect the sediment, and drying, and (d) in an inert gas atmosphere, sintering the dried product and crystallizing to obtain the material. x = 0.1-0.9.