▎ 摘　　要

NOVELTY - Production of negative electrode sheet involves carrying out redox reaction with natural flake graphite, concentrating sulfuric acid, potassium permanganate and sodium carbonate, mixing graphene oxide, nano silica and hydrofluoric acid, heating obtained mixture to obtain graphene/silica material; and mixing negative electrode active material, conductive agent and superabsorbent, coating sides of slurry into negative electrode copper foil collector, rolling and drying to obtain product. USE - Method for producing negative electrode sheet used in graphene lithium ion battery. ADVANTAGE - The method is safe, has high voltage, electrical conductivity, no corrosion, good low temperature performance of electrolyte, large capacity battery, fast charging speed, long service life, long endurance mileage and high conductivity. DETAILED DESCRIPTION - Production of negative electrode sheet comprises: (A) carrying out redox reaction with natural flake graphite, and concentrating sulfuric acid, potassium permanganate and sodium carbonate to obtain graphene oxide; (B) mixing graphene oxide, nano silica and hydrofluoric acid at mass ratio of 50-150:40-60:10-50 to obtain mixture; (C) heating obtained mixture to obtain graphene/silica material; (D) placing obtained graphene/silica material into centrifugal separator, centrifuging to obtain bent graphene; (E) mixing obtained bent graphene and nano silicon at mass ratio of 1:2-3 and doping 15-20% soft carbon to obtain silicon/graphene composite material; (F) coating silicon/graphene composite with carbon to obtain negative electrode active material; and (G) mixing negative electrode active material, conductive agent and superabsorbent at mass ratio of 90:4:5-6 to obtain slurry of negative electrode active material, coating sides of slurry into negative electrode copper foil collector, rolling and drying to obtain product.