期刊
ELECTROCHIMICA ACTA
卷 311, 期 -, 页码 103-113出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.04.029
关键词
Lithium vanadium phosphate; Substitution mechanism; Mg-doping; Thermodynamics
资金
- Austrian government
Monoclininc lithium vanadium phosphate, Li3V2(PO4)(3), is regarded as a potential cathode material for the next generation of high-performance lithium ion batteries, since it exhibits a high discharge voltage (up to similar to 4.1 V) and a large theoretical specific capacity (197 mAhg(-1)). However, the low intrinsic electronic conductivity of Li3V2(PO4)(3), which is a prevailing challenge for olivine type compounds, inhibits its use in commercial applications. Although the substitution of V3+ by other cation species is a common procedure to increase the conductivity and electrochemical performance of Li3V2(PO4)(3), the underlying mechanisms for the improved properties are not yet well understood. Therefore, a thermodynamic approach is used in this work to investigate the influence of dopant, i.e. Mg2+ as well as vacancies on the V3+ site on the stability of the resulting materials. On the basis of the measured partial molar Gibbs energies, entropies and enthalpies of the electrochemical reaction, a detailed discussion of the substitution mechanisms and their influence on the electrochemical performance is presented. (C) 2019 Elsevier Ltd. All rights reserved.
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