Modeling the discharge behavior of a lithium-sulfur battery

被引:18
|
作者
Erisen, Nisa [1 ]
Eroglu, Damla [2 ]
机构
[1] Middle East Tech Univ, Dept Chem Engn, Ankara, Turkey
[2] Bogazici Univ, Dept Chem Engn, TR-34342 Istanbul, Turkey
关键词
carbon-to-sulfur ratio; cell design; electrochemical modeling; electrolyte-to-sulfur ratio; lithium-sulfur batteries; HIGH-ENERGY DENSITY; MATHEMATICAL-MODEL; ELECTROCHEMICAL PERFORMANCE; POLYSULFIDE SHUTTLE; KEY PARAMETERS; CELL; ELECTROLYTE; DESIGN; LIQUID; CAPACITY;
D O I
10.1002/er.5701
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
In lithium-sulfur (Li-S) batteries, the discharge performance depends greatly on a number of cell design parameters because of the complex reaction mechanisms in the cathode. Electrolyte-to-sulfur (E/S) ratio and carbon-to-sulfur (C/S) ratio in the cell are key examples of these critical design factors that define the Li-S battery performance. Here, a 1-D electrochemical model is reported to calculate the dependence of the discharge behavior of a Li-S battery on the E/S and C/S ratios. Proposed model describes the complex kinetics through two electrochemical and two dissolution/precipitation reactions. Concentration variations in the cathode are also taken into account in the model. Characteristic aspects of the discharge profile of a Li-S battery -the two distinct voltage plateaus and the voltage dip in between- are captured in the predicted voltage curve. Similar trends on the discharge performance of the Li-S cell with varying E/S and C/S ratios are projected; both voltage and discharge capacity of the Li-S battery are improved substantially with increasing C/S or E/S ratio up to a certain point, whereas, the dependence of the discharge performance on these factors is less substantial at higher ratios. This model offers a mechanistic interpretation of the influence of cell design on the Li-S battery performance.
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页码:10599 / 10611
页数:13
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