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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 5    October 2003

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Si-doped composite carbon as anode of lithium ion batteries
GUO Hua-jun(郭华军), LI Xin-hai(李新海), WANG Zhi-xing(王志兴),
PENG Wen-jie(彭文杰), GUO Yong-xing(郭永兴)

College of Metallurgical Science and Engineering,
Central South University, Changsha 410083, China

Abstract:Si-doped composite material was prepared by coating artificial graphite with the mixture of phenol resin and polysilicone and following with heat-treatment at 1050℃ in an argon gas atmosphere. The structure and characteristics of the composite carbon were determined by means of XRD, SEM, BET surface area and electrochemical measurements. The new carbon material has a disordered carbon/graphite composite structure, with silicon doped in the disordered carbon. Compared with the pristine graphite, the electrochemical performance is improved for the Si-doped composite carbon with large reversible capacity of 312.6mAh/g, high initial charge/discharge efficiency of 88.61%, and excellent cycle stability. The prototype batteries using the composite carbon as anode material have large discharge capacity of 845mAh and high capacity retention ratio of 95.80% at the 200th cycle.

 

Key words: Li-ion battery; carbon; anode; Si-doped; capacity

ISSN 1672-7029
CN 43-1423/U

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