Enhanced cycling stability of LiMn sub(2O) sub(4) cathode by amorphous FePO sub(4 coating)

The cycling performance of LiMn sub(2O) sub(4) at room and elevated temperatures is improved by FePO sub(4 modification through chemical deposition method. The pristine and FePO) sub(4)-coated LiMn sub(2O) sub(4) materials are characterized by X-ray diffraction, Raman spectroscopy, scanning electron...

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Published in:Electrochimica acta 2011-07, Vol.56 (19), p.6612-6618
Main Authors: Qing, Chunbo, Bai, Ying, Yang, Jueming, Zhang, Weifeng
Format: Article
Language:English
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Summary:The cycling performance of LiMn sub(2O) sub(4) at room and elevated temperatures is improved by FePO sub(4 modification through chemical deposition method. The pristine and FePO) sub(4)-coated LiMn sub(2O) sub(4) materials are characterized by X-ray diffraction, Raman spectroscopy, scanning electron microscopy and transmission electron microscopy. Their cycling performances are thoroughly investigated and compared. The 3 wt.% FePO sub(4-coated LiMn) sub(2)O sub(4 exhibits capacity losses of only 32% and 34% at room temperature and 55 degree C, respectively, after 80 cycles, much better than those of the pristine material, 55% and 72%. The cyclic voltammograms at 55 degree C reveal that the improvement in the cycling performance of FePO) sub(4)-coated LiMn sub(2O) sub(4) electrodes can be attributed to the stabilization of spinel structures. The separation of FePO sub(4 between active materials and electrolyte and its interaction with SEI (solid electrolyte interphase) film are believed to account for the improved performances.)
ISSN:0013-4686
DOI:10.1016/j.electacta.2011.04.131