▎ 摘　　要

NOVELTY - Element-doped synergistic graphene-coated layered manganese-based sodium-ion battery anode material (I) is new. (I) is composed of sodium-lithium-nickel-manganese oxide particles and graphene coated on the surface of the sodium-lithium-nickel-manganese oxide particles. The stoichiometric ratio of nickel and manganese elements adds up to 1-y. USE - (I) is useful as sodium-ion battery anode material (claimed). ADVANTAGE - (I): has smooth charge-discharge curve in the voltage range of 2-4.5 V; has no obvious voltage platform; and exhibits high reversible capacity, excellent multiplying power performance and excellent cycle stability. The preparation method: has simple process and high product yield; utilizes non-toxic and safe required raw materials; and is suitable for industrial production. DETAILED DESCRIPTION - Element-doped synergistic graphene-coated layered manganese-based sodium-ion battery anode material of formula (NaxLiy(Ni,Mn)1-yO2-G) (I) is new. (I) is composed of sodium-lithium-nickel-manganese oxide (NaxLiy(Ni,Mn)1-yO2) particles and graphene coated on the surface of the sodium-lithium-nickel-manganese oxide particles. The stoichiometric ratio of nickel and manganese elements adds up to 1-y. x = 1/2-1; y = 0-3/10; and G = graphene. An INDEPENDENT CLAIM is also included for preparation of (I).