Quantitative Galvanostatic Intermittent Titration Technique for the Analysis of a Model System with Applications in Lithium-Sulfur Batteries
Quantitative Galvanostatic Intermittent Titration Technique for the Analysis of a Model System with Applications in Lithium-Sulfur Batteries
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DOI：
10.1002/celc.201701004
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发表时间：
2018-02-01
期刊：
影响因子：
4
通讯作者：
Garcia-Araez, Nuria
中科院分区：
文献类型：
--
作者：
Dibden, James W.;Meddings, Nina;Garcia-Araez, Nuria
恒电流间歇滴定技术（GITT）是一种功能强大的电池表征工具，可提供有关电池性能的关键热力学和动力学信息。然而，锂硫电池的GITT测量的定量分析到目前为止仅限于评估电池的内阻和平衡电压曲线。在这项工作中，我们提供的数学框架来表征的质量传输动力学在锂硫电池从GITT数据，我们证明了该方法的有效性，通过应用到一个模型和良好的系统，乙基紫精，其扩散系数证实了循环伏安法数据。本方法对于离子插入电极的分析也是有利的，其中浓度和电压变化的非线性将通过GITT数据的经典分析产生对扩散系数的不切实际的评估。
The galvanostatic intermittent titration technique (GITT) is a powerful characterization tool for batteries, which provides key thermodynamic and kinetic information about battery performance. However, the quantitative analysis of GITT measurements for lithium-sulfur batteries has so far been limited to the evaluation of the internal resistance of the cell and the equilibrium voltage profiles. In this work, we provide the mathematical framework to characterize the mass-transport kinetics in lithium-sulfur batteries from GITT data, and we demonstrate the validity of the approach through the application to a model and well-behaved system, ethyl viologen, whose diffusion coefficient is corroborated by cyclic voltammetry data. The present approach is also advantageous for the analysis of ion-insertion electrodes, where non-linearity of concentration and voltage changes would produce unrealistic evaluations of the diffusion coefficient by the classical analysis of GITT data.