▎ 摘　　要

NOVELTY - A self-adaptive three-dimensional layered reduced graphene oxide-embedded carbon coated nano silicon sphere negative electrode material comprises self-adaptive three-dimensional layered structure formed by cross-linking and reduction of graphene oxide and cross-linking agent on surface of carbon-coated silicon nano sphere. The structure has elastic buffer space, which can alleviate the volume expansion caused by the negative electrode material during charge and discharge, and improve the stability of the negative electrode material. USE - Self-adaptive three-dimensional layered reduced graphene oxide-embedded carbon coated nano silicon sphere negative electrode material for lithium-ion battery (claimed) used in high-capacity energy storage devices. ADVANTAGE - The method relieves capacity reduction caused by volume expansion of the silicon/carbon electrode compared with the existing electrode obtained by coating sodium carboxymethyl cellulose (CMC) binder on the copper foil, so the negative electrode material has higher specific capacity and excellent cycle stability. The lithium-ion battery negative electrode material can still maintain a specific capacity of 550 mAh g-1after 200 cycles at a current density of 0.5 Ag-1. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: preparation of the negative electrode material involves dispersing graphene oxide in organic solvent, mixing the graphene oxide with carbon-coated nano silicon and thickening agent, stirring to obtain precursor, mixing the precursor with cross-linking agent and catalyst, stirring to enable the graphene oxide and the cross-linking agent to generate a cross-linking reaction to obtain a cross-linking reaction product, coating the cross-linking reaction product on copper foil and drying to obtain a graphene oxide-silicon/carbon composite material, and carrying out thermal reduction of the composite material; and a lithium-ion battery, which comprises negative electrode sheet comprising negative electrode active material containing the self-adaptive three-dimensional layered reduced graphene oxide-embedded carbon coated nano silicon sphere.