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Modification of natural graphite using pitch through dynamical melt-carbonization

  • Zhou You-yuan  (周友元)
  • Li Xin-hai  (李新海)Email author
  • Guo Hua-jun  (郭华军)
  • Wang Zhi-xing  (王志兴)
  • Yang Yong  (杨勇)
  • Xie Qiao-ling  (谢巧玲)
Article

Abstract

The graphite was modified using pitch through dynamical melt-carbonization, and the effects of modification temperature and the amount of pitch on the characteristics of graphite were investigated. The structure and characteristics of the graphite were determined by X-ray diffractometry(XRD), scanning electron microscopy(SEM), particle size analysis and electrochemical measurements. The results show that the modified graphite has a disordered carbon/graphite composite structure, larger average particle diameter, greater tap density, and better electrochemical characteristics than the untreated graphite. The sample coated with 10% pitch dynamical melt-carbonized at 400 °C for 3 h and heat-treated at 850 °C for 2 h has better electrochemical performances with a reversible capacity of 360.5 mA·h/g, a irreversible capacity of 41.0 mA·h/g, and an initial coulombic efficiency of 89.8% compared with natural graphite and disordered carbon. The cycling stability of the Li/C cell with modified graphite as anodes is improved, and its capacity retention ratio at the 30th cycle is up to 94.37%.

Key words

lithium ion battery graphite dynamical melt-carbonization anode 

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Copyright information

© Central South University Press, Sole distributor outside Mainland China: Springer 2007

Authors and Affiliations

  • Zhou You-yuan  (周友元)
    • 1
  • Li Xin-hai  (李新海)
    • 1
    Email author
  • Guo Hua-jun  (郭华军)
    • 1
  • Wang Zhi-xing  (王志兴)
    • 1
  • Yang Yong  (杨勇)
    • 1
  • Xie Qiao-ling  (谢巧玲)
    • 1
  1. 1.School of Metallurgical Science and EngineeringCentral South UniversityChangshaChina

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