▎ 摘　　要

NOVELTY - A composite nanomaterial comprises graphene nanoplate and tin(IV) sulfide (SnS2) nanomaterial at mass ratio of 1:1-4:1. USE - Composite nanomaterial used as electrode for battery. ADVANTAGE - The composite nanomaterial can be synthesized with one-step hydrothermal method. The method has moderate reaction condition and simple process. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the composite nanomaterial, comprising: (A) dispersing graphite powder (0.015-0.072 g) into concentrated sulfuric acid (20-25 mL) in 0 degrees C ice bath, adding 3-4 times potassium permanganate with stirring for 30-60 minutes, then warming to 30-35 degrees C, adding deionized water (40-50 ml), stirring for 20-30 minutes, adding 30% hydrogen peroxide (10-15 ml), stirring for 5-20 minutes, centrifugally separating the product, and repeatedly washing the product using 5% hydrochloric acid solution, deionized water and acetone to obtain oxidized graphite nanoplate; (B) dissolving L-cysteine with deionized water, adding stannic chloride pentahydrate, and uniformly stirring to dissolve and obtain solution, where mol ratio of L-cysteine to stannic chloride is 6:1-12:1; (C) adding the oxidized graphite nanoplate to the solution, where mass ratio of graphite material to stannic chloride is 1:1-4:1; and (D) carrying out ultrasonic treatment for 1-2 hours to fully disperse the oxidized graphite nanoplate to the solution, transferring the mixture to hydrothermal reaction kettle with PTFE lining, sealing the reaction kettle and reacting for 20-36 hours at 180-220 degrees C, then centrifugally separating the product, washing the product using deionized water and absolute ethyl alcohol, and drying the product.