Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Enhanced Electrochemical Properties of Surface Modified LiMn2O4 by Li-Fe Composites for Rechargeable Lithium Ion Batteries

  • Shi, Jin-Yi (Department of Chemistry, Korea University) ;
  • Yi, Cheol-Woo (Department of Chemistry and Institute of Basic Science, Sungshin Women's University) ;
  • Liang, Lianhua (Department of Chemistry, Korea University) ;
  • Kim, Keon (Department of Chemistry, Korea University)
  • Published : 2010.02.20
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Abstract

The surface modified $LiMn_2O_4$ materials with Li-Fe composites were prepared by a sol-gel method to improve the electrochemical performance of $LiMn_2O_4$ and were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), and transmission electron microscopy (TEM)-EDS. XRD results indicate that all the samples (modified and pristine samples) have cubic spinel structures, and XRD, XPS, and TEM-EDS data reveal the formation of $Li(Li_xFe_xMn_{2-2x})O_4$ solid solution on the surface of particles. For the electrochemical properties, the modified material demonstrated dramatically enhanced reversibility and stability even at elevated temperature. These improvements are attributed to the formation of the solid solution, and thus-formed solid solution phase on the surface of $LiMn_2O_4$ particle reduces the dissolution of Mn ion and suppresses the Jahn-Teller effect.

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References

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