▎ 摘　　要

NOVELTY - A graphene preparing method involves dissolving graphene oxide material in solvent by stirring to obtain graphene oxide solution. The graphene oxide solution is spray-dried to obtain graphene oxide powder. The graphene oxide powder is subjected to reduction using a reducing agent or high temperature heat treatment to obtain graphene. USE - Method for preparing graphene that is utilized in lithium-sulfur battery (claimed), high energy storage material and device. ADVANTAGE - The method enables preparing graphene with better effect of improving energy ratio, rate performance and energy density of the lithium sulfur battery, in simple and cost-effective manner, and is suitable for large-scale production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a use of graphene in lithium-sulfur battery.