▎ 摘　　要

NOVELTY - A multi-layer composite material of nitrogen-doped diffusion layer graphite phosphorization tin comprises graphite-nitrogen doped diffusion layer graphite doped with tin phosphate/nitrogen-phosphorus doped sheet graphite, tin nitrogen-titanium doped surface graphite with a coating, where the tin phosphate size is in the nanometer level, and the average interlayer distance d002 value is 0.3366 nm of the nitrogen doped graphene oxide graphite is uniformly dispersed in the interlayer of the graphite. USE - Multi-layer composite material of nitrogen-doped diffusion layer graphite phosphorization tin ADVANTAGE - The electrode material exhibits a higher cycle specific capacity and very good cycle stability, and has good application prospect. The preparation technique of the composite negative electrode material is simple and controllable, the operation is convenient, and suitable for industrial production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the multi-layer composite material of nitrogen-doped diffusion layer graphite phosphorization tin