Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Synthesis and Electrochemical Properties of Li3V2(PO4)3-LiMnPO4 Composite Cathode Material for Lithium-ion Batteries

  • Yun, Jin-Shik (Center For Energy Convergence, Korea Institute of Science and Technology) ;
  • Kim, Soo (Center For Energy Convergence, Korea Institute of Science and Technology) ;
  • Cho, Byung-Won (Center For Energy Convergence, Korea Institute of Science and Technology) ;
  • Lee, Kwan-Young (Department of Material Science and Engineering, Korea University) ;
  • Chung, Kyung Yoon (Center For Energy Convergence, Korea Institute of Science and Technology) ;
  • Chang, Wonyoung (Center For Energy Convergence, Korea Institute of Science and Technology)
  • Received : 2012.10.02
  • Accepted : 2012.11.14
  • Published : 2013.02.20
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Abstract

Carbon-coated $Li_3V_2(PO_4)_3-LiMnPO_4$ composite cathode materials are first reported in this work, prepared by the mechanochemical process with a complex metal oxide as the precursor and sucrose as the carbon source. X-ray diffraction pattern of the composite material indicates that both olivine $LiMnPO_4$ and monoclinic $Li_3V_2(PO_4)_3$ co-exist. We further investigated the electrochemical properties of our $Li_3V_2(PO_4)_3-LiMnPO_4$ composite cathode materials using galvanostatic charging/discharging tests, where our $Li_3V_2(PO_4)_3-LiMnPO_4$ composite electrode materials exhibit the charge/discharge efficiency of 91.9%, while $Li_3V_2(PO_4)_3$ and $LiMnPO_4$ exhibit the efficiency of 87.7 and 86.7% in the first cycle. The composites display unique electrochemical performances in terms of overvoltage and cycle stability, displaying a reduced gap of 141.6 mV between charge and discharge voltage and 95.0% capacity efficiency after $15^{th}$ cycles.

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References

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