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http://dx.doi.org/10.5012/bkcs.2013.34.2.433

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)
Publication Information
Bulletin of the Korean Chemical Society / v.34, no.2, 2013 , pp. 433-436 More about this Journal
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.
Keywords
Li-ion batteries; Mechanochemical process; Composite; $Li_3V_2(PO_4)_3$; $LiMnPO_4$;
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