▎ 摘　　要

NOVELTY - A polyanionic anode precursor comprises a lithium-iron-manganese silicate (I). USE - Polyanionic anode precursor is used in preparation of graphene-coated lithium-iron-manganese silicate hollow nanospheres (all claimed) used as anode material for lithium-ion battery. ADVANTAGE - The graphene-coated lithium-iron-manganese silicate hollow nanospheres obtained using the polyanionic anode precursor has uniform particle distribution, excellent microstructure, and electrochemical performance. DETAILED DESCRIPTION - A polyanionic anode precursor comprises a lithium-iron-manganese silicate of formula: Li2FexMn1-xSiO4 (I), where x is 1, 0.8, 0.7, 0.6, or 0.5. INDEPENDENT CLAIMS are included for the following: (1) graphene-coated lithium-iron-manganese silicate hollow nanospheres, which are prepared from the polyanionic cathode material, and have particle size of 200-800 nm, and nanosphere wall thickness of 20-100 nm; and (2) preparation of graphene-coated lithium-iron-manganese silicate hollow nanospheres, which involves performing emulsion polymerization of styrene as raw material, polyvinylpyrrolidone as dispersant, azobisisobutylamidine hydrochloride as initiator under inert atmosphere, to prepare polystyrene microspheres, dispersing the polystyrene microspheres in solution of tetraethyl orthosilicate, cetyltrimethylammonium bromide, ethanol, water and aqueous ammonia, stirring at room temperature, centrifuging, washing and drying to obtain mesoporous silica-coated polystyrene microspheres, ultrasonically dispersing the microspheres in an alcohol solution containing lithium salt, iron salt and manganese salt, heating, adding graphene oxide aqueous solution, stirring, absorbing, centrifuging, washing, freeze-drying, and calcining at high temperature under inert gas atmosphere.