▎ 摘　　要

NOVELTY - A graphene nanosheet preparing method involves dissolving iron nitrate nonahydrate, vanadyl oxalate and trimesic acid in water to obtain a mixed solution, transferring the mixed solution to a hydrothermal reaction vessel for hydrothermal reaction, washing the product and drying to obtain a MIL-100 coated vanadium-based nano material, taking the MIL-100 coated vanadium-based nano material for calcination, acidifying, washing and drying to obtain the finished product. USE - Method for preparing graphene nanosheet of negative electrode material for lithium ion battery. ADVANTAGE - The method enables preparing graphene nanosheet of negative electrode material with high specific capacity and circulating stability, and in simple manner. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a graphene nanosheet prepared by the method (2) a use of graphene nanosheet (3) a lithium ion battery.