▎ 摘　　要

NOVELTY - Pole piece comprises a current collector (1), a bottom coating and an active material layer (3). The surface of the current collector is sequentially provided with a bottom coating and active material layer along the direction away from the current collector. The bottom coating (2) comprises a composite conductive agent grafted with carbon nanomaterial, conductive polymers and bottom coating binder. USE - The pole piece is useful in secondary battery of an electric device (all claimed). ADVANTAGE - The pole piece protects oxide film on the surface of the current collector from being damaged, inhibits corrosion of the electrolyte to the current collector, and improves safety, battery life, rate performance and cycle performance of the secondary battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation method of the composite material of carbon nanotubes contained in the pole piece and composite conductive agent grafted by the conductive polymer using hydroxylated carbon nanotubes, N, N-dimethylformamide solvent, 3-aminothiophenol, conductive polymer monomer, chloroform, potassium persulfate, hydrochloric acid, mercaptolated conductive polymer and absolute ethanol. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the composite pole piece for lithium ion battery. 1Current collector 2Bottom coating 3Active material layer