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Journal Article
Superior charge-transfer kinetics of NASICON-type Li3V2(PO4)3 cathodes by multivalent Al3+ and Cl− substitutions
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- Authors
- J.N. Son, S.H. Kim, M.C. Kim, G.J. Kim, V. Aravindan, Y.G. Lee, Y.S. Lee
- Issue Date
- 2013-05
- Citation
- Electrochimica Acta, v.97, pp.210-215
- ISSN
- 0013-4686
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- The kinetic properties of Li insertion in NASICON-type Li3V 2(PO4)3 cathodes were enhanced substantially by Al3+ and Cl- multivalent substitutions of various concentrations. Pristine and carbon coated, Al-doped Li3V 2(PO4)3 were also prepared by a conventional solid-state approach under optimized conditions. Samples phase purity was investigated through X-ray diffractometry. Li insertion was studied in half-cells at 3-4.8 V vs. Li for the removal of 3 mol of Li. Carbon-coated Li3V1.98Al0.02(PO4) 2.99Cl0.01 showed the highest reversible insertion of 2.71 mol of Li (178 mAh g-1) at a current density of 0.2 mA cm -2. It showed a capacity retention of over 80% after 100 cycles. Cl- substitution led to improved performance under harsh conditions of 15 C rate and high temperature (50 °C). The enhancement of Li ion kinetics was demonstrated through cyclic voltammetry in a two-electrode configuration and electrochemical impedance spectroscopy confirmed the enhanced conductivity. © 2013 Elsevier Ltd. All rights reserved.
- KSP Keywords
- Al-doped, Carbon coated, Charge-transfer kinetics, Cyclic voltammetry, Electrochemical Impedance Spectroscopy, Enhanced conductivity, Half-cell, Harsh conditions, High Temperature, Improved performance, Kinetic properties