▎ 摘　　要

NOVELTY - Silicon-based material, is claimed. The silicon-based material has a core-shell structure, and the core-shell structure includes a core material and a shell material, where the core material includes a silicon-based material, and the shell material includes lithium salt modified graphene. USE - The silicon-based material is useful in negative electrode sheet for battery (claimed). ADVANTAGE - (I): can relieve the volume stress generated by the silicon material during the lithium ion insertion/extraction process by coating the lithium salt modified graphene on the surface of the silicon material; at the same time can also synergistically improve the electrode conductivity and thus improving the electrochemical performance of the battery including cycle performance, specific capacity, and charge-discharge efficiency. DETAILED DESCRIPTION - Silicon-based material, is claimed. The silicon-based material has a core-shell structure, and the core-shell structure includes a core material and a shell material, where the core material includes a silicon-based material, and the shell material includes lithium salt modified graphene. The lithium salt in the lithium salt-modified graphene is an organic lithium salt containing an amine group, and the lithium salt is of formula (R2-R1-NH2). R1 = 1-7C alkylene group or arylene group; and R2 = lithium sulfonate or lithium sulfonimide, preferably -S(=O)(=O)-O-Li+, -S(=O)(=O)-N-Li+-S(=O)(=O)-R3, -S(=O)(=O)-N-Li+-S(=O)(=N)-R4-S(=O)(=O)-R5; and R3, R4, R5 = halo or -CH3 substituted by at least one halo. INDEPENDENT CLAIMS are included for: (1) negative electrode sheet, comprising a negative electrode active material, and the negative electrode active material comprises the silicon-based material; and (2) Battery, comprising the silicon-based material or negative electrode sheet.