Bulletin of the Korean Chemical Society

  • 제32권3호
  • /
  • Pages.836-840
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  • 2011
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  • 0253-2964(pISSN)
  • /
  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Li Ion Diffusivity and Improved Electrochemical Performances of the Carbon Coated LiFePO4

  • Park, Chang-Kyoo (Advanced Battery Center, Korea Institute of Science and Technology) ;
  • Park, Sung-Bin (Department of Materials Science and Engineering, Korea University) ;
  • Oh, Si-Hyung (Advanced Battery Center, Korea Institute of Science and Technology) ;
  • Jang, Ho (Department of Materials Science and Engineering, Korea University) ;
  • Cho, Won-Il (Advanced Battery Center, Korea Institute of Science and Technology)
  • 투고 : 2010.10.08
  • 심사 : 2010.12.29
  • 발행 : 2011.03.20
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초록

This study examines the effects of a carbon coating on the electrochemical performances of $LiFePO_4$. The results show that the capacity of bare $LiFePO_4$ decreased sharply, whereas the $LiFePO_4$/C shows a well maintained initial capacity. The Li ion diffusivity of the bare and carbon coated $LiFePO_4$ is calculated using cyclic voltammetry (CV) to determine the correlation between the electrochemical performance of $LiFePO_4$ and Li diffusion. The diffusion constants for $LiFePO_4$ and $LiFePO_4$/C measured from CV are $6.56{\times}10^{-16}$ and $2.48{\times}10^{-15}\;cm^2\;s^{-1}$, respectively, indicating considerable increases in diffusivity after modifications. The Li ion diffusivity (DLi) values as a function of the lithium content in the cathode are estimated by electrochemical impedance spectroscopy (EIS). The effects of the carbon coating as well as the mechanisms for the improved electrochemical performances after modification are discussed based on the diffusivity data.

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