▎ 摘　　要

NOVELTY - A composite electrode comprises 80 wt.% bismuth sulfide-molybdenum disulfide/graphene composite nanomaterials, 10 wt.% acetylene black, 5 wt.% carboxymethyl cellulose and 5 wt.% polyvinylidene fluoride. USE - Composite electrode is useful for electrochemical storage of sodium. ADVANTAGE - The composite electrode provides high reversible specific capacity and rate charge and discharge characteristics and excellent stable cycle performance to the sodium. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of composite electrode, which involves adding bismuth(III) nitrate pentahydrate, sodium molybdate dihydrate and L-cysteine to deionized water, stirring to obtain uniform mixed solution, ultrasonically dispersing graphene oxide in deionized water to obtain uniform suspension, adding suspension of graphene oxide to the mixed solution, stirring for 2 hours, transferring the obtained reaction mixture to hydrothermal reaction vessel with PTFE liner, sealing, reacting at 200 degrees C for 24 hours, naturally cooling to room temperature, hydrothermally reacting to obtain precipitated product, centrifuging, washing with deionized water and anhydrous ethanol, drying at 80 degrees C for 12 hours under vacuum to obtain bismuth sulfide-molybdenum disulfide/graphene composite nanomaterials, mixing with N-methylpyrrolidone solution of acetylene black, carboxymethyl cellulose and polyvinylidene fluoride to obtain uniform slurry, applying the uniform slurry to copper foil as current collector, drying at 100-120 degrees C for 12 hours and rolling, where the ratio of bismuth(III) nitrate pentahydrate and sodium molybdate dihydrate is 1:4, the amount of L-cysteine is 5 times the sum of the amounts of bismuth(III) nitrate pentahydrate and sodium molybdate dehydrate, the amount of graphene oxide is equal to twice the sum of the amounts of bismuth(III) nitrate pentahydrate and sodium molybdate dehydrate, the molar ratio of bismuth and molybdenum is 1:4, and the mass ratio of bismuth sulfide-molybdenum disulfide/graphene composite nanomaterials, acetylene black, carboxymethyl cellulose and polyvinylidene fluoride is 80:10:5:5.