Analysis of a Mathematical Model of Lithium-Sulfur Cells Part III: Electrochemical Reaction Kinetics, Transport Properties and Charging
Analysis of a Mathematical Model of Lithium-Sulfur Cells Part III: Electrochemical Reaction Kinetics, Transport Properties and Charging
复制标题
锂硫电池数学模型分析第三部分：电化学反应动力学、传输特性和充电
DOI：
10.1016/j.electacta.2014.06.033
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发表时间：
2014
影响因子：
6.6
通讯作者：
Pu Chen
中科院分区：
文献类型：
--
作者：
M. Ghaznavi;Pu Chen
通过研究锂硫电池数学模型对交换电流密度、扩散系数和阴极厚度在较宽范围内变化的响应，对模型进行了灵敏度分析，并利用分析结果解释了实验中观察到的系统行为的某些方面。特别地，在所有的交换电流密度中，元素硫还原的交换电流密度对电池的放电容量具有最显著的影响。还分析了扩散系数的变化，提供了关于放电后电池中沉淀物的不均匀性的信息。提出了获得最大容量的最佳阴极厚度。最后，对充电过程进行了模拟研究，表明该模型需要较大的硫化二锂溶度积才能模拟电池的充电过程。
Sensitivity analysis of a mathematical model of a lithium-sulfur (Li-S) battery was performed by investigating the response of the model to variation of the exchange current densities, diffusion coefficients, and cathode thickness over a wide range; the results of the analysis were used to explain the some aspects of the behavior of the system which may be seen in experiments. In particular, among all the exchange current densities, the exchange current density of the elemental sulfur reduction has the most significant effect on the discharge capacity of the cell. The variation of the diffusion coefficients was also analyzed, providing information on the non-uniformity of precipitants in the cell after discharge. An optimum cathode thickness was presented to gain the highest capacity of the cell. Finally, the simulation of charging was studied, showing that the model needs a large solubility product of di-lithium sulfide to be able to simulate the charge process of a cell.