▎ 摘　　要

NOVELTY - Preparation of graphene composite metal boride and sulfur composite nanomaterial involves dissolving 0.5-3 M sodium borohydride and sodium hydroxide into deionized water to obtain reducing agent solution, and placing obtained reducing agent solution and metal salt aqueous solution into ice water bath; hydrothermally reacting 2-10 mL of 1 mol/L graphene and 50 mg metal boride at 180 degrees C for 12 hours to obtain graphene composite metal boride; and mixing graphene composite metal boride and elemental sulfur at mass ratio of 1:1-4, heating and calcining at 150-180 degrees C for 12-24 hours. USE - Method for preparing graphene composite metal boride and sulfur composite nanomaterial used in preparation of lithium sulfur battery anode (claimed). ADVANTAGE - The method is simple, clean and environment-friendly, and has excellent lithium polysulfide adsorption capacity, improved lithium sulfur battery stability and low cost. DETAILED DESCRIPTION - Preparation of graphene composite metal boride and sulfur composite nanomaterial comprises dissolving 0.5-3 M sodium borohydride and sodium hydroxide into deionized water under inert gas protection conditions to obtain reducing agent solution, dissolving metal salt into deionized water to obtain 0.5-2 M metal salt aqueous solution, and placing obtained reducing agent solution and metal salt aqueous solution into ice water bath for 15 minutes; slowly adding aqueous metal salt solution into reducing agent solution under inert gas protection conditions and 1 drop/second rate, stirring for 30-60 minutes to obtain dried product, and calcining dried product at 350-500 degrees C for 2-10 hours to obtain metal boride; hydrothermally reacting 2-10 mL of 1 mol/L graphene and 50 mg metal boride at 180 degrees C for 12 hours to obtain graphene composite metal boride; and mixing graphene composite metal boride and elemental sulfur at mass ratio of 1:1-4, heating and calcining at 150-180 degrees C for 12-24 hours. An INDEPENDENT CLAIM is included for preparation of the lithium sulfur battery anode comprising oven drying graphene composite metal boride, sulfur composite nanomaterial, conductive agent and adhesive agent at 40-80 degrees C to obtain lithium-sulfur battery anode material.