Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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The Origin of the Residual Carbon in LiFePO4 Synthesized by Wet Milling

  • Park, Sung-Bin (Department of Materials Science and Engineering, Korea University) ;
  • Park, Chang-Kyoo (Department of Materials Science and Engineering, Korea University) ;
  • Hwang, Jin-Tae (Department of Materials Science and Engineering, Korea University) ;
  • Cho, Won-Il (Battery Research Center, Korea Institute of Science and Technology) ;
  • Jang, Ho (Department of Materials Science and Engineering, Korea University)
  • Received : 2010.10.08
  • Accepted : 2010.12.06
  • Published : 2011.02.20
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Abstract

This study reports the origin of the electrochemical improvement of $LiFePO_4$ when synthesized by wet milling using acetone without conventional carbon coating. The wet milled $LiFePO_4$ delivers 149 $mAhg^{-1}$ at 0.1 C, which is comparable to carbon coated $LiFePO_4$ and approximately 74% higher than that of dry milled $LiFePO_4$, suggesting that the wet milling process can increase the capacity in addition to conventional carbon coating methods. UV spectroscopy, elemental microanalysis, and evolved gas analysis are used to find the root cause of the capacity improvement during the mechanochemical reaction in acetone. The analytical results show that the improvement is attributed to the conductive residual carbon on the surface of the wet milled $LiFePO_4$ particles, which is produced by the reaction of $FeC_2O_4{\cdot}2H_2O$ with acetone during wet milling through oxygen deficiency in the precursor.

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References

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