▎ 摘　　要

NOVELTY - Preparing cathode material modified by reactive two-dimensional molecular brush SEI film involves performing free radical polymerization on graphene oxide surface grafting functional polymer salt to obtain a two-dimensional molecular brush with a functional polymer salt in the side chain, performing ion exchange to obtain a two-dimensional molecular brush with a metal ion-containing polymer salt in the side chain, filtering the obtained two-dimensional molecular brush on the porous membrane to obtain a two-dimensional molecular brush film, transferring the two-dimensional molecular brush film to the surface of the lithium metal sheet by the film transfer technology and constructing the cathode material modified by the two-dimensional molecular brush SEI film. USE - Method for preparing cathode material modified by reactive two-dimensional molecular brush SEI film used in lithium metal ion battery (claimed). ADVANTAGE - The cathode electrode material has excellent mechanical property, can effectively reduce the interface impedance, and can induce uniform deposition of lithium ions on the surface of the lithium metal cathode electrode, so that the assembled lithium ion battery has excellent electrochemical performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a lithium ion battery, which comprises a positive electrode and a negative material modified by the reactive two-dimensional molecular brush SEI film.