▎ 摘　　要

NOVELTY - Preparing composite graphene catalyst of double metal hydroxide comprises (i) using natural graphite powder as raw material to prepare required graphene oxide through Hummer's s method, (ii) dispersing the graphene oxide prepared in formamide aqueous solution, adding metal source for stirring reaction, and adding sodium hydroxides solution in the reaction process so that the pH of the solution is maintained at 9.5-10.5, and collecting the precipitate to clean the reaction, and (iii) dissolving the cleaned precipitate in deionized water and adding strong reduction agent to react, washing precipitate after the reaction and drying. USE - The method is useful for preparing composite graphene catalyst of double metal hydroxide, which is used in anode material of lithium-sulfur battery. ADVANTAGE - The lithium-sulphur battery prepared by the catalyst has good specific capacity and cycle performance. The partial isomorphic substitution of the high valence metal helps to form surface charge, can be electrostatic to capture polysulfide anion, improve the utilization rate of the active substance sulphur. A large amount of hydroxyl high-sulfur of layered double metal hydroxide surface which can be used as the adsorption site of poly sulfide to effectively promote redox reaction of poly sulfide, reducing the shuttle effect of poly sulfur. At the same time, using in-situ one-step synthesis method, the two-dimensional layered double-metal hydroxides with good conductivity, large specific surface area of reduced graphene oxide to assemble, so as to provide more unsaturated coordination sites DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for application of the double-metal hydroxide composite graphene catalyst in anode material of lithium-sulfur battery.