Journal
ELECTROCHIMICA ACTA
Volume 56, Issue 7, Pages 2823-2827Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2010.12.063
Keywords
Lithium ion batteries; Cathode materials; Lithium vanadium phosphate; Aluminothermal reaction
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Funding
- National Natural Science Foundation of China [21071153, 20976198]
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Monoclinic Li3V2-xAlx(PO4)(3) with different Al3+ doping contents (x = 0, 0.05, 0.08, 0.10 and 0.12) have been prepared by a facile aluminothermal reaction. Aluminum nanoparticles have been used as source for Al3+ and nucleus for Li3V2-xAlx(PO4)(3) nucleation as well as reducing agent in the aluminothermal strategy. The products were investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and electrochemical methods. The XRD results show that the as-obtained Li3V2-xAlx(PO4)(3) has a phase-pure monoclinic structure, irrespective of the Al3+ doping concentration. Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) results reveal that the charge-transfer resistance of the Li3V2(PO4)(3) is reduced and the reversibility is enhanced after V3+ substituted by Al3+. In addition, The Li3V2-xAlx(PO4)(3) phases exhibit better cycling stability than the pristine Li3V2(PO4)(3). (C) 2010 Elsevier Ltd. All rights reserved.
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