期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 159, 期 10, 页码 A1573-A1578出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.001210jes
关键词
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资金
- Natural Science Foundation of China [50825203, 21175050]
- MOST [2011AA11290, 2011DFB70020]
- PCSIRT (Program for Changjiang Scholars and Innovative Research Team in University)
- National Science Foundation [CHE-0718482]
- Research Corporation for Science Advancement
- ERG from Sam Houston State University
The profile of Fe-incorporation into carbon-coated Li3V2(PO4)(3) (LVP) cathode material for lithium ion batteries has been systematically investigated with X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectrometry and electrochemical measurements. The results confirm the coexistence of Li3+xV2-yFe2+y(PO4)(3), LiFePO4 and FePO4 in the Fe-incorporated LVP/C composite. The FePO4 appears to be present as an amorphous phase associated with the carbon coat. Compared with pristine LVP/C, significant improvement in capacity, cycling stability, and rate capability in LVP/C-Fe were achieved, which is attributed to the reduced particle size, a decreased electrolyte/electrode charge-transfer resistance, and a suppressed electrolyte/electrode reaction at high voltage. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.001210jes] All rights reserved.
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