Aluminothermal synthesis and characterization of Li3V2-xAlx(PO4)(3) cathode materials for lithium ion batteries

作者：Ai, Dengjun; Liu, Kaiyu^*; Lu, Zhouguang; Zou, Minmin; Zeng, Dongqing; Ma, Jun

来源：Electrochimica Acta, 2011, 56(7): 2823-2827.

DOI：10.1016/j.electacta.2010.12.063

• Lithium ion batteries
• Cathode materials
• Lithium vanadium phosphate
• Aluminothermal reaction

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).

• 出版日期2011-2-28
• 单位中南大学