▎ 摘　　要

NOVELTY - Preparing cathode material based on nitrogen-doped graphene/modified silicon oxide comprises preparing silicon dioxide x-doped-carbon core-shell material including providing weak alkali aqueous solution, phenolic resin precursor, nano-silicon oxide and guiding agent, adding nano-silicon oxide and guiding agent to the weak alkaline aqueous solution, performing first-stage ultrasound, adding phenolic resin precursor drop wise to the weak alkaline aqueous solution, continuing the first-level ultrasonic, reacting, centrifuging, collecting precipitate, drying, carbonizing to obtain a mesoporous carbon-coated modified dioxide composite material, namely silicon dioxide x-doped-carbon core-shell material and preparing cathode material including providing modified graphene fiber, conductive graphite, aqueous dispersant, binder and deionized water, mixing uniformly into primary slurry, transferring the primary slurry to a ball mill, ball milling to obtain the cathode material. USE - The cathode material is useful in battery (claimed). ADVANTAGE - The method ensures that the nano-mesoporous spheres has good electrical conductivity, so that nano-mesoporous spheres form a large number of surface voids; is convenient for the subsequent embedding of nitrogen-doped graphene and carbon nano tube; has the function of stabilizing nitrogen-doped graphene and carbon nano tube; helps to build a three-dimensional conductive frame and improves the overall conductivity; facilitates the intercalation or deintercalation of lithium ions into the modified silicon oxide through the three-dimensional conductive framework and increase the capacity of the electrode. DETAILED DESCRIPTION - Preparing cathode material based on nitrogen-doped graphene/modified silicon oxide comprises preparing silicon dioxide x-doped-carbon core-shell material including providing weak alkali aqueous solution with mass fraction of 5-10%, phenolic resin precursor, nano-silicon oxide and guiding agent, where the volume of the phenolic resin precursor does not exceed 10% of the volume of the weak alkaline aqueous solution, adding nano-silicon oxide and guiding agent to the weak alkaline aqueous solution, performing first-stage ultrasound for 10-60 minutes, adding phenolic resin precursor drop wise to the weak alkaline aqueous solution, continuing the first-level ultrasonic, reacting at 30-60℃ for 10-60 minutes, centrifuging, collecting precipitate, drying, carbonizing to obtain a mesoporous carbon-coated modified dioxide composite material, namely silicon dioxide x-doped-carbon core-shell material, preparing modified graphene fiber including providing N-methyl pyrrolidone and silicon dioxide x-doped-carbon core-shell material in a ratio of100: 5-20, mixing uniformly, adding nitrogen-doped graphene and carbon nano-tube in N-methyl pyrrolidone, where the ratio of silicon dioxide x-doped-carbon core-shell material, nitrogen-doped graphene and carbon nano-tube is 100: 5-20: 5-20, performing second-stage ultrasound on N-methylpyrrolidone while adding carbon nano-tube and nitrogen-doped graphene, adding fiber-forming polymer to N-methylpyrrolidone, transferring to an oil bath at 120-126℃, stirring, mixing, using as the spinning raw liquid, electro-spinning using a spinning needle whose inner diameter becomes larger in the direction of spinning, collecting, cutting to obtain modified graphene fibers with a length of 0.2-10 mm and preparing cathode material including providing modified graphene fiber, conductive graphite, aqueous dispersant, binder and deionized water, mixing uniformly into primary slurry, where the ratio of the modified graphene fiber, conductive graphite, binder and aqueous dispersant is 100-500:2-5:2-5:0.2-2, transferring the primary slurry to a ball mill, ball milling for 5-20 minutes to obtain the cathode material, where the size of the nano-silicon oxide is 50-100 nm. An INDEPENDENT CLAIM is also included for a cathode material based on nitrogen-doped graphene/modified silicon oxide prepared by the above method. The cathode material comprises modified graphene fibers, conductive graphite, a binder and an aqueous dispersant.