中文摘要：

采用液相及动态熔融法使沥青炭均匀包覆于天然石墨的表面，观察天然石墨的表面结构，测量其物理参数，考核复合材料的充放电性能。结果表明：天然石墨表面存在沥青热解碳，粒径、振实密度增大，复合炭材料的充放电容量、循环性能都得到提高。添加5％沥青经400℃炭化3h、850℃热处理2h的样品，电化学性能最好，可逆容量为362mAh／g，不可逆容量为31．7mAh／g，首次充放电效率为92．0%，30个循环周期后，容量保持率为96．6％

英文摘要：

The graphite was modified by the liquid method and dynamically melt-carbonization of the pitch. The structure and characteristics of the graphite were determined by X-ray diffraction, scanning electron microscopy, particle size analysis and electrochemical measurements. The results show that the modified graphite has a disordered carbon/graphite composite structure,larger average particle diameter, bigger tap density,and better electrochemical characteristics than the untrented graphite. The sample for 50% pitch at 400℃ for 3h and heat-treated at 850℃ for 2h has the best electrochemical performances with a reversible capacity of 362mAh/g,a irreversible capacity of 31.7mAh/g, and an initial coulombic efficiency of 92.0%. The cycling stability of the Li/C cell with modified graphite as anodes is improved. Its capacity retention ratio at the 30th cycle is up to 96.6 %.