期刊
ELECTROCHIMICA ACTA
卷 345, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.136208
关键词
TiNb2O7 nanocrystals; Diffusion coefficient; Galvanostatic intermittent titration technique (GITT); Electrochemical impedance spectroscopy (EIS); Capacitive contribution
资金
- Technology Mission Division, Department of Science Technology [DST/TMD/MES/2k16/114]
The diffusion coefficients and kinetics of lithium ion transport in TiNb2O7 nanocrystals at different charge-discharge potentials are determined by using Galvanostatic Intermittent Titration Technique (GITT), Electrochemical Impedance Spectroscopy (EIS) and Cyclic Voltammetry (CV). The chemical diffusion coefficient values (D-chem) at different intercalation and de-intercalation potentials vary in a range of 10(-15) - 10(-16) cm(2) s(-1) and exhibit a `W'-type behavior. The differential intercalation capacity (C-int) derived from various electrochemical techniques are compared, which showed maximum value at the lowest chemical diffusion coefficient. Cyclic voltammograms recorded at different scan rates are used to study the kinetics of Li-ions, which showed a capacitive behavior of 53% at 0.10 mV s(-1) for TiNb2O7, demonstrating its suitability as high rate anode material in lithium ion batteries. (C) 2020 Elsevier Ltd. All rights reserved.
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