▎ 摘　　要

NOVELTY - Preparing binary precursor stretching graphene composite film comprises e.g. taking graphite sheet as raw material, synthesizing graphene powder by using existing Hummers method, adding 0.324 g ferric chloride, 0.1700 g sodium nitrate and 0.011 g sodium fluoride separately into beaker, adding 20 ml distilled water to obtain ferric red uniform solution, adding 0.020 g graphene powder, stirring uniformly under magnetic stirrer to obtain mixed solution, rapidly transferring mixed solution into polytetrafluoroethylene liner reactor, sealing, transferring into reaction kettle and reacting. USE - The binary precursor stretching graphene composite film is useful for preparing cathode of lithium-ion battery (claimed), inorganic solar cells and drugs targeting sustained release prospects. ADVANTAGE - The graphene composite film: improves circulation, capacitance, charging and discharging efficiency of power lithium ion battery. The method is simple, economical, environmentally friendly. DETAILED DESCRIPTION - Preparing binary precursor stretching graphene composite film comprises (i) taking graphite sheet as raw material, synthesizing graphene powder by using existing Hummers method, (ii) adding 0.324 g ferric chloride, 0.1700 g sodium nitrate and 0.011 g sodium fluoride separately into beaker, adding 20 ml distilled water to obtain ferric red uniform solution, adding 0.020 g graphene powder, stirring uniformly under magnetic stirrer to obtain mixed solution, (iii) rapidly transferring step (ii) mixed solution into polytetrafluoroethylene liner reactor, sealing, transferring into reaction kettle, reacting for 6 hours under 95 degrees C, (iv) removing from reaction kettle, cooling naturally to room temperature, washing using distilled water, drying to obtain black solid powder, (v) introducing step (iv) black solid powder into porcelain boat, placing porcelain boat in muffle furnace, heating at the rate of 5 degrees C/minute under nitrogen gas atmosphere to 550 degrees C for 2 hours, (vi) removing porcelain boat containing black solid powder, cooling naturally in air to obtain black powder shape solid sample and (vii) taking step (vi) powder shape solid sample, through slurry coating method preparing binary precursor stretching graphene composite film and vacuum drying.