▎ 摘　　要

NOVELTY - Graphene preparation involves mixing multi-walled carbon nanotubes, potassium nitrate and concentrated sulfuric acid, stirring to form a mixture, mixing potassium permanganate with the mixture, stirring, heating in a water bath, keeping warm for a period of time, obtaining a reaction solution, cooling the reaction solution to room temperature, uniformly mixing hydrogen peroxide solution and ice water mixture, washing and centrifuging to obtain graphene. USE - Graphene for preparing nano-tube using electronic device (claimed) of a sheet anode electric core of an electronic device i.e. lithium ion battery. ADVANTAGE - The graphene nano-tube has excellent conductivity and large surface area. The unique tubular structure can connect the lithium iron phosphate particles to improve the conductivity between them, so as to improve cycle performance under the condition of multiplying power performance and high rate based on lithium iron phosphorus fluoride (LiFePO4) electric core, the cycle performance and low temperature performance under high-rate condition. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: an anode; and an electric core. DESCRIPTION OF DRAWING(S) - The drawing shows a comparison diagram of cycle performance of the graphene for preparing nano-tube (Drawing includes non-English language text).