Studies on kinetics and diffusion characteristics of lithium ions in TiNb2O7
Studies on kinetics and diffusion characteristics of lithium ions in TiNb2O7
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DOI：
10.1016/j.electacta.2020.136208
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发表时间：
2020-06-10
影响因子：
6.6
通讯作者：
Shaijumon, M. M.
中科院分区：
文献类型：
--
作者：
Babu, Binson;Shaijumon, M. M.
采用恒电流间歇滴定法（GITT）、电化学阻抗谱（EIS）和循环伏安法（CV）研究了不同充放电电位下锂离子在TiNb 2 O 7纳米晶中的扩散系数和输运动力学。在不同的嵌入和脱嵌电位下的化学扩散系数值（D-chem）在10（-15）~ 10（-16）cm（2）·s（-1）范围内变化，呈现“W”型行为。比较了不同电化学方法测得的微分插层容量（C-int），发现在最低的化学扩散系数处有最大值。在不同扫描速率下记录的循环伏安图被用于研究锂离子的动力学，其显示出TiNb_2O_7在0.10 mV s（-1）下的电容行为为53%，表明其适合作为锂离子电池的高倍率阳极材料。(C)2020爱思唯尔有限公司保留所有权利。
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.