▎ 摘　　要

NOVELTY - A hollow porous graphene-doped carbon/silicon nanofiber lithium battery cathode material comprises silicon doped nanoparticles and graphene dispersed into carbon nanofibers constituting matrix, where the ratio of carbon/graphene/silicon is 80:15-25:2 and the cathode material has porosity of 800-1000 g/cm3. USE - Hollow porous grapheme doped carbon/silicon nanofiber lithium battery cathode material. ADVANTAGE - The hollow porous grapheme doped carbon/silicon nanofiber lithium battery cathode material has high surface area and porosity, increased electrode conductivity and improved circulation stability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing a hollow porous graphene doped carbon/silicon nanofiber lithium battery cathode material, which involves ultrasonically dispersing graphene oxide to a mixed solvent of N,N-dimethylformamide and acetic acid at room temperature to obtain a uniform graphene oxide dispersion solution, where the concentration of the graphene oxide is 0.1-1%, volume ratio of N,N-dimethylformamide and acetic acid is 15:1-5, and the ultrasonic dispersing time is 4-10 hours, adding taking polyacrylonitrile powder, polymethyl methacrylate powder and ethyl orthosilicate to graphene oxide solution, ultrasonically stirring at 80 degrees C for 2-8 hours, obtaining mixed solution of polyacrylonitrile/poly (methyl methacrylate/ethyl orthosilicate/graphite oxide), where the mass concentration of polyacrylonitrile is 5-10 % and the mass concentration of ethyl orthosilicate is 1-5%, adding polymethyl methacrylate powder to N,N-dimethylformamide to obtain 5-15 mass% polymethyl methacrylate solution, taking polyacrylonitrile/poly (methyl methacrylate/ethyl orthosilicate/graphite oxide solution as shell layer solution), the polymethyl methacrylate solution as core layer solution, separately transferring to injector and carrying out electrostatic spinning, where the spinning liquid flow rate is respectively, 0.1-2 ml/h and 0.5-1 ml/h, spinning voltage is 15-25K V, utilizing roller as distance between receiving device, expansion cylinder and needle tip of 20-40 cm to obtain the polyacrylonitrile doped grapheme oxide/silicon dioxide nanometer fiber felt, drying the nanometer fiber felt at 50-100 degrees C for 10-20 hours, transferring to pre-oxidizing furnace under air atmosphere for 2-5 hours, carbonizing at speed of 1-10 degrees C , heating to 800-1000 degrees C, preserving temperature for 1-5 hours to obtain graphite doped hollow and porous carbon/silicon dioxide nanofiber felt, transferring the nanofiber felt and obtained magnesium powder mixture to carbonizing furnace, carrying out high temperature heat reduction reaction at 1-10 degrees C per minute and rate to 500-800 degrees C under argon gas atmosphere, keeping the temperature for 1-5 hours, treating the oxide with hydrochloric acid for 5-20 hours, carrying out distillation water washing for 3 times, putting into vacuum baking box at 50-100 degrees C for 10-20 hours to obtain graphite doped hollow and porous carbon/silicon nanofiber, adding graphite doped hollow and porous carbon/silicon nanofiber into polyvinylidene fluoride/acetylene black mixed solution as binder adhered to on copper foil, where the mass ratio of vinylidene fluoride/acetylene black is 1:1, the mass ratio of binder and graphite doped, hollow and porous carbon/silicon nanofiber is 1:1-30, putting graphite doped, hollow and porous carbon/silicon nanofiber and electrode piece in drying box at 100-200 degrees C under overnight to obtain hollow-porous graphene doped carbon/silicon nano fiber lithium battery cathode material.