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

被引：89
作者：
Ai, Dengjun [1 ]
Liu, Kaiyu [1 ]
Lu, Zhouguang [1 ]
Zou, Minmin [1 ]
Zeng, Dongqing [1 ]
Ma, Jun [1 ]
机构：
[1] Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2011年 / 56卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Lithium ion batteries; Cathode materials; Lithium vanadium phosphate; Aluminothermal reaction; VANADIUM PHOSPHATE; ELECTROCHEMICAL PERFORMANCE; INSERTION PROPERTIES; DOPED LI3V2(PO4)(3); SPECTROSCOPY; REDUCTION; STABILITY; CAPACITY;
D O I：
10.1016/j.electacta.2010.12.063
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
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.
引用
收藏
页码：2823 / 2827
页数：5
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