Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Synthesis and Electrochemical Properties of Nanocrystalline LiFePO4 Obtained by Different Methods

  • Son, C.G. (Faculty of Applied Chemical Engineering, Chonnam National University) ;
  • Chang, D.R. (Korea Institute of Industrial Technology) ;
  • Kim, H.S. (Korea Institute of Industrial Technology) ;
  • Lee, Y.S. (Faculty of Applied Chemical Engineering, Chonnam National University)
  • Received : 2011.05.10
  • Accepted : 2011.06.29
  • Published : 2011.06.30
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Abstract

Nanocrystalline $LiFePO_4$ powders were prepared at 660-$670^{\circ}C$ in an Ar atmosphere using two different synthetic routes, solid-state and sol-gel. Both materials showed well-developed XRD patterns without any impurity peaks. Particles composed in the range of 200-300 nm from the solid-state method, and 50-100 nm from the sol-gel method, were confirmed through scanning electron microscopy and dynamic light scattering. The $LiFePO_4$ obtained by the sol-gel method offered a high discharge capacity (153 mAh/g) and stable discharge behavior, even at elevated temperatures (50 and $60^{\circ}C$), whereas poor electrochemical performance was observed from the solid-state method. Rate capability studies for sol gel-derived $LiFePO_4$ ranged from 0.2 to 30 C, which revealed excellent retention over 70 cycles with a 99.9% capacity.

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References

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