▎ 摘　　要

NOVELTY - A silicon/nitrogen-doped graphene composite material is prepared by taking commercial silicon powder, carbon source and nitrogen source, wet ball milling, drying, and sintering under inert atmosphere protection. USE - Method for preparing silicon/nitrogen-doped graphene composite material for lithium ion battery cathode material (claimed). ADVANTAGE - The product has excellent cycle and multiplying power performance, has simple and reliable manufacturing technique suitable for industrialization, cheap raw material, low equipment requirement, simple synthesis route, convenient regulation, and has high controllability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of lithium ion battery cathode comprising taking silicon/nitrogen-doped graphene composite material, Super-p cellulose and sodium carboxymethyl cellulose, adding deionized water, ball milling for 1-10 hours, coating onto copper foil, drying at 50 plus minus 20 degrees C for 3-24 hours, pressing onto current collector, cutting to prepare electrode sheet, drying at 100 plus minus 20 degrees C for 10-24 hours, pumping argon gas, taking metal lithium as counter electrode, polyethylene porous membrane as membrane, preparing electrolyte comprising 0.5-0.8 mol/L lithium hexafluorophosphate dissolved in 1:1:1 volume ratio of ethylene carbonate, ethylmethyl carbonate and diethyl carbonate mixed solution, assembling battery, and testing constant current charge-discharge capacity and cycle performance.