▎ 摘　　要

NOVELTY - Double site doped modified anode material comprises an anode core and a carbon coating layer. The anode core has a sodium vanadium phosphate complex (Na3-xMxV2-y/3Ny(PO4)3-a(Xn-)3a/n). The particle size of the modified sodium vanadium phosphate anode material is 50-600 nm. USE - The anode material is useful in sodium-ion battery (claimed). ADVANTAGE - The anode material adopts alkali metal to replace sodium position and vanadium position at the same time; ensures that the sodium-site substitution improves the charge-discharge voltage of the material; ensures that the vanadium-site substitution adjusts local chemical bonds and electron distribution; realizes the accurate lattice control and improves the electron and ion conductivity. DETAILED DESCRIPTION - Double site doped modified anode material comprises an anode core and a carbon coating layer. The anode core has a sodium vanadium phosphate complex (Na3-xMxV2-y/3Ny(PO4)3-a(Xn-)3a/n). The particle size of the modified sodium vanadium phosphate anode material is 50-600 nm. M = lithium-ion, sodium ion, potassium ion, rubidium ion or caesium ion; N = lithium-ion, sodium ion, potassium ion, rubidium ion or caesium ion; Xn- = borate ion, sulfate ion, orthosilicate ion, pyrophosphate ion, tetraborate ion, nitride ion, sulfide ion, fluoride ion, chloride ion or bromide ion; x = 0.01-0.2; y = 0.01-0.3; and a = 0-1. An INDEPENDENT CLAIM is also included for preparing double site doped modified anode material comprising (a) mixing the sodium source, the doped ion source M, the doped ion source N, the vanadium source, the phosphorus source, the doped anion source Xn- and the carbon source in a solvent, heating, stirring to 40-200degrees Celsius at a speed of 100-800revolutions/minute for 0.5-4 hours until the solvent evaporates to dryness to obtain the precursor, where the solvent is a volatile solvent including water, ethanol, acetone and/or ethyl acetate and (b) sintering the precursor obtained in step (a) at 450-950degrees Celsius for 1-24 hours to obtain the modified anode material, where the atmosphere used in the sintering process comprises argon, nitrogen and argon containing 5% hydrogen.