▎ 摘　　要

NOVELTY - Sodium-rich ruthenium-doped layered oxide, is claimed. The sodium-rich ruthenium-doped layered oxide is prepared by doping the tetravalent ruthenium body phase with O3 phase sodium-nickel-manganese-oxide complex. USE - The sodium-rich ruthenium-doped layered oxide is useful for preparing battery anode sheet in sodium ion batteries (all claimed). ADVANTAGE - The sodium-rich ruthenium-doped layered oxide has improved reversible initial discharge capacity, improves the energy density and rate performance of the material, and a highly reversible phase transition is ensured under long cycles, which efficiently improves its cycle life. DETAILED DESCRIPTION - Sodium-rich ruthenium-doped layered oxide (O3 phase Na1.1Ni0.35RuxMnyO2) is claimed. The sodium-rich ruthenium-doped layered oxide is prepared by doping the tetravalent ruthenium body phase with O3 phase sodium-nickel-manganese-oxide complex (Na1.1Ni0.35Mn0.55O2). x = 0.05-0.02; and x+y = 0.55. INDEPENDENT CLAIMS are also included for: Preparing sodium-rich doped ruthenium layered oxide, comprising (i) mixing sodium salt, nickel salt, tetravalent manganese salt and tetravalent ruthenium source according to the stoichiometric ratio, carrying out ball milling in the presence of a dispersant, and drying the slurry after ball milling to obtain a sodium-rich ruthenium-doped layer oxide precursor powder, and (ii) pressing the obtained sodium-rich ruthenium-doped layered oxide precursor powder into a tablet, performing calcination treatment, quenching and cooling to obtain the sodium-rich ruthenium-doped layered oxide, where the calcination treatment includes placing the tablet in a muffle furnace, heating at 400-500 ℃ for 4-6 hours, cooling naturally, heating at 900-1000 ℃ for 5-8 hours, and quenching to obtain the sodium-rich doped ruthenium layered oxide, the heating rate is 2-5 ℃/minute; and Preparing battery anode sheet, comprising uniformly mixing anode material, carbon material, binder and solvent to obtain a slurry, coating the slurry uniformly on one side of a carbon-coated aluminum foil, and curing to obtain the battery anode sheet, where the anode material is the sodium-rich ruthenium-doped layered oxide.