▎ 摘　　要

NOVELTY - A lithium ion battery electrode material comprises (mass %) graphene/stannic sulfide nanocomposite active material (75-85), acetylene black (5-10) and polyvinylidene fluoride (10). The mass ratio of the active material to the stannic sulfide in the nanocomposite active material is (1:1)-(4:1). USE - Electrode material used for lithium ion battery (claimed). ADVANTAGE - The electrode material is capable of providing electrodes having high electrochemical lithium-storing capacity and excellent circulating stability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of lithium ion battery electrode, comprising (1) dispersing 0.015-0.072 g of graphite powder into 20-25 mL of concentrated sulfuric acid under 0 degrees C ice bath; stirring while adding potassium permanganate (KMnO4) at 3-4 times of mass dosage; stirring for 30-60 minutes until the temperature reaches 30-35 degrees C; adding 40-50 mL of deionized water; stirring for 20-30 minutes; adding 10-15 mL of hydrogen peroxide (H2O2) with 30 % mass concentration; stirring for 5-20 minutes; centrifugally separating, repeatedly washing using 5 % mass concentration of hydrochloric acid (HCl) solution, deionized water and acetone to obtain graphite oxide nano pieces; (2) dissolving L-cysteine into deionized water; adding hydrated stannic chloride (SnCl4.5H20), fully stirring to dissolve; adding the graphite oxide nano pieces obtained in step (1) into the solution; ultrasonically processing for 1-2 hours to fully dissolve the graphite oxide nano pieces in the hydrothermal reaction solution; transferring the mixture into a hydrothermal reactor with PTFE, sealing, reacting for 20-36 hours at 180-200 degrees C, centrifugally separating the products, washing with deionized water and absolute ethyl alcohol, drying to obtain the graphene/stannic sulfide (SnS2) composite nanomaterial; (3) taking the graphene/SnS2 composite nanomaterial as the active material of the electrode, fully mixing with acetylene black and N-methylpyrrolidone solution with 5 % mass concentration of polyvinylidene fluoride to obtain a uniform pasty material, uniformly coating the pasty material on a copper foil as liquid-collecting body, vacuum-drying and rolling to obtain the electrode. In step (2), the mole ratio of L-cysteine to stannic chloride is (6:1)-(12:1), and the mass ratio of graphite to stannic chloride is (1:1)-(4:1).