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Synthesis and electrochemical performance of YF-coated LiMnO cathode materials for Li-ion batteries

Rare Metals, ISSN: 1001-0521, Vol: 30, Issue: 1, Page: 39-43
2011
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Spinel LiMnO cathodes were coated with 1 mol% YF. X-ray diffraction (XRD) analyses showed that Y and/or F did not enter the lattice of the LiMnO crystal. Transmission electron microscopy (TEM) showed that a compact YF layer of 5-20 nm in thickness was coated onto the surface of LiMnO particles. Scanning electron microscopy (SEM) observation showed that the YF coating caused the agglomeration of LiMnO particles. The cycling test demonstrated that the YF coating can improve the electrochemical performance of LiMnO at both 20 and 55°C. Moreover, YF-coated LiMnO exhibited an improved rate capability compared with the uncoated one at high rates over 5C. The immersion test in electrolytes showed that YF -coated LiMnO is more erosion resistant than the uncoated one. © 2011 The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg.

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