▎ 摘　　要

NOVELTY - A positive electrode material comprises a composite material in which naphthalene tetracarboxylic diimide materials and graphene materials are coated with each other in the mass ratio of 1-2:1. USE - Positive electrode material used in lithium secondary battery (claimed). ADVANTAGE - The positive electrode material uses concentrated sulfuric acid dispersing and re-depositing method, preparing the composite material of naphthalene tetracarboxylic diimide and reduced graphene oxide coated with each other, the special structure increases the contact material and conductive carbon, increases the conductivity of the whole component, reduces the ion transmission path, inhibits the dissolving of naphthalene tetracarboxylic diimide small molecule to improve the cycle performance of the battery. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: 1. preparation of positive electrode material, which involves (s1) adding naphthalene tetracarboxylic dianhydride, solvent, and amino group-containing compound into a reaction device with a protective gas, stirring and reacting to obtain a mixed solution (A), centrifuging, washing and drying to obtain naphthalene tetracarboxylic diimide powder, (s2) adding powder into the reaction device, adding concentrated sulfuric acid several times, stirring, adding graphene, ultrasonically treating, stirring to obtain the mixed solution (B), (s3) freezing deionized water into ice-water mixture, continuously stirring in an ice bath, slowly pouring the mixed solution (B) into ice-water mixture to obtain a mixed solution (C), (s4) centrifuging, washing until neutral, centrifuging again to obtain the mixture, drying to obtain a preliminary product, grinding, and calcining under protective gas; and 2. application of positive electrode material in lithium secondary battery, which involves (a) mixing positive electrode material, the conductive agent and the binder, roll forming a film, cutting into discs, drying to obtain the positive electrode sheet, and (b) assembling a button battery in order of positive electrode sheet, separator, and negative electrode lithium sheet, and dripping electrolyte solution between intervals of each layer of materials.