Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Preparation of LiFe PO4 Using Chitosan and its Cathodic Properties for Rechargeable Li-ion Batteries

  • Hong, Kyong-Soo (High-Technology Components & Materials Research Center, Korea Basic Science Institute) ;
  • Yu, Seong-Mi (High-Technology Components & Materials Research Center, Korea Basic Science Institute) ;
  • Ha, Myoung-Gyu (High-Technology Components & Materials Research Center, Korea Basic Science Institute) ;
  • Ahn, Chang-Won (High-Technology Components & Materials Research Center, Korea Basic Science Institute) ;
  • Hong, Tae-Eun (High-Technology Components & Materials Research Center, Korea Basic Science Institute) ;
  • Jin, Jong-Sung (High-Technology Components & Materials Research Center, Korea Basic Science Institute) ;
  • Kim, Hyun-Gyu (High-Technology Components & Materials Research Center, Korea Basic Science Institute) ;
  • Jeong, Euh-Duck (High-Technology Components & Materials Research Center, Korea Basic Science Institute) ;
  • Kim, Yang-Soo (Suncheon Branch, Korea Basic Science Institute) ;
  • Kim, Hae-Jin (Energy Nano Materials Team, Korea Basic Science Institute) ;
  • Doh, Chil-Hoon (Korea Electrotechnology Research Institute) ;
  • Yang, Ho-Soon (Department of Physics, Pusan National University) ;
  • Jung, Hee (Department of Computer Science, Gyeongsang National University)
  • Published : 2009.08.20
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Abstract

The LiFeP$O_4$ powder was synthesized by using the solid state reaction method with Fe($C_2O_4){\cdot}2H_2O,\;(NH_4)_2HPO_4,\;Li_2CO_3$, and chitosan as a carbon precursor material for a cathode of a lithium-ion battery. The chitosan added LiFePO4 powder was calcined at 350 ${^{\circ}C}$ for 5 hours and then 800 ${^{\circ}C}$ for 12 hours for the calcination. Then we calcined again at 800 ${^{\circ}C}$ for 12 hours. We characterized the synthesized compounds via the crystallinity, the valence states of iron ions, and their shapes using TGA, XRD, SEM, TEM, and XPS. We found that the synthesized powders were carbon-coated using TEM images and the iron ion is substituted from 3+ to 2+ through XPS measurements. We observed voltage characteristics and initial charge-discharge characteristics according to the C rate in LiFeP$O_4$ batteries. The obtained initial specific capacity of the chitosan added LiFeP$O_4$ powder is 110 mAh/g, which is much larger than that of LiFeP$O_4$ only powder.

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