▎ 摘　　要

NOVELTY - A sulfur-Ketjen black graphene composite material comprises graphene layer, sulfur and Ketjen black, where the Ketjen black disposed between the graphene layers and the mass ratio of sulfur, ketjen black and graphene is 0.4-1.28: 0.02-0.1: 0.016-0.1. USE - Sulfur-Ketjen black graphene composite material for liquid flow battery (claimed). ADVANTAGE - The sulfur-Ketjen black graphene composite material has high conductivity and stability and effectively inhibit the polysulfide shuttle effect outer layer of graphene. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a method for preparing a sulfur-Ketjen black graphene composite material, which involves adding 0.02-0.1 g Ketjen black to water, dispersing evenly, adding 2.48-4.96 g sodium thiosulfate pentahydrate to disperse evenly, adding 5-6g concentrated hydrochloric acid and mixing to obtain the mixture and adding a graphene oxide suspension to the mixture, mixing uniformly, separating the solid and liquid, washing and drying to obtain the finished product, where the mass ratio of graphene oxide in the graphene oxide suspension is 1:0.8-1 (2) a liquid flow battery comprises electrolyte and a positive electrode material suspended and dispersed in the electrolyte, where the positive electrode material is sulfur-Ketjen black-graphene composite material.