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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 2
BKCSDE 31(2)
February 20, 2010

Title	Enhanced Electrochemical Properties of Surface Modified LiMn₂O₄ by Li-Fe Composites for Rechargeable Lithium Ion Batteries
Author	Jin Yi Shi, Cheol Woo Yi, Lianhua Liang, Keon Kim
Keywords	Lithium manganese oxide, Surface modification, Solid solution, Spinel, Lithium ion batteries
Abstract	The surface modified LiMn₂O₄ materials with Li-Fe composites were prepared by a sol-gel method to improve the electrochemical performance of LiMn₂O₄ 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)O₄ 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 LiMn₂O₄ particle reduces the dissolution of Mn ion and suppresses the Jahn-Teller effect.
Page	309 - 314
Full Text	PDF

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