Effect of Electrolyte-to-Sulfur Ratio in the Cell on the Li-S Battery Performance

Emerce, Nur Ber
Eroglu, Damla
The effect of electrolyte-to-sulfur (E/S) ratio on the electrochemical and cell- and systems-level performance of a Li-S battery is investigated through modeling efforts. A 1-D electrochemical model is proposed predicting the cell voltage at 60% discharge depth. In the model, increasing electrolyte amount improves the cell voltage by linearly increasing the cathode exchange current density, which is the single kinetic model parameter. Moreover, cathode specific capacity is either defined as a linear function of the E/S ratio or taken constant in the performance models. Increasing E/S ratio enhances the cell- and systems-level specific energy and energy density until 9 mL/g S when cathode specific capacity depends on the E/S ratio. However, when the cathode specific capacity is constant at 1200 mAh/g S, battery performance decreases continuously with increasing electrolyte amount. The effect of other critical design parameters-cathode thickness, carbon-to-sulfur ratio, S loading and excess Li%- are also considered in the analysis. (C) 2019 The Electrochemical Society.


Effect of electrolyte/sulfur ratio in the cathode on the electrochemical performance of Li-S batteries
Emerce, Nur Ber; Külah, Görkem; Eroğlu Pala, Damla; Department of Chemical Engineering (2019)
In this study, the effect of electrolyte to sulfur (E/S) ratio in the cathode, which is an important cell design parameter, on the electrochemical and cell- and system-level performance of a Lithium-Sulfur (Li-S) battery is investigated through modeling efforts. First, a 1-D electrochemical model is developed for an isothermal, constant-current discharge of a Li-S cell to predict the voltage at 60% discharge depth. In the model, cathode exchange current density is defined as a linear function of the electro...
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Citation Formats
N. B. Emerce and D. Eroglu, “Effect of Electrolyte-to-Sulfur Ratio in the Cell on the Li-S Battery Performance,” JOURNAL OF THE ELECTROCHEMICAL SOCIETY, pp. 0–0, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/65333.