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Chemcial Industry and Engineering 2017, Vol. 34 Issue (5) :89-95    DOI: 10.13353/j.issn.1004.9533.20161035
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A Mathematical Model for a Lithium-Sulfur Cell
Yu Congcong1, Zhang Jing2, Huang Chengde1
1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2. Tianjin Institute of Power Sources, Tianjin 300381, China

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Abstract 

The active surface loss due to the precipitation of polysulfides causes lithium-sulfur cell capacity fade. A mathematical model of nucleation and growth of polysulfides is presented to describe the effect of polysulfides' precipitation in the lithium-sulfur cell. In addition, error function of erf(x) is used to modify capacity fade of lithium-sulfur cell due to active surface loss. The model is validated using experimental discharge curves obtained from literature with fairly high accuracy. Furthermore, the necessity of rapid precipitation of lower polysulfides is discussed in detail. Increasing growth rates of Li2S2 and Li2S cause the potential plateau raised. And increasing growth and nucleation rate of S2- is necessary to enhance discharge capacity.
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Articles by authors
Yu Congcong
Zhang Jing
Huang Chengde
Keywords： lithium sulfur cell；   polysulfides；   nucleation and growth；   precipitation reaction     
Received 2016-03-17;
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Yu Congcong, Zhang Jing, Huang Chengde.A Mathematical Model for a Lithium-Sulfur Cell[J]  Chemcial Industry and Engineering, 2017,V34(5): 89-95
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