▎ 摘　　要

NOVELTY - The preparation of a lithium ion battery silicon negative electrode material involves: crushing serpentine, removing metal impurities, acid washing and filter pressing on the crushed serpentine by adopting 98 mass% concentrated sulfuric acid to obtain filter residue, and sintering the filter residue at 900-1100?oC to obtain amorphous silicon; adding amorphous silicon into a dispersion solvent to obtain amorphous silicon slurry, adding graphene oxide slurry and dispersing for 30 minutes to obtain composite slurry; heating the composite slurry to 200?oC, emulsifying for 2 hours, and spray drying the emulsified slurry to obtain particles with the particle size less than 30 microns; sintering the particles at 1000?oC under argon and zero pressure; adding the sintered particles into N-methyl-2-pyrrolidone solution, dispersing for 30 minutes, and adding graphene and carbon nano tubes; spray drying the dispersed slurry, sieving and vacuum packaging. USE - Preparation method of high performance lithium ion battery silicon cathode material. ADVANTAGE - The method uses serpentine as the source material of silicon. The serpentine has a large reserve, and is easy to buy and low cost. The method provides the high performance lithium ion battery silicon cathode material with excellent electrochemical performance, capacity of 2800 mAh/g under the condition that the charging and discharging rate of 0.5C, the first effect of more than 80%, and the cycle performance in 200 weeks of more than 75%. The preparation process is simple and industrial large-scale mass production can be achieved.