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 molecular and electronic structure on the light-harvesting properties of dye sensitizers
Mete, E.; Üner, Deniz; Cakmak, M.; Gulseren, O.; Ellialtoglu, S. (American Chemical Society (ACS), 2007-05-24)
The systematic trends in structural and electronic properties of perylenediimide (PDI)-derived dye molecules have been investigated by DFT calculations based on the projector-augmented wave (PAW) method including gradient-corrected exchange-correlation effects. Time-dependent density functional theory (TDDFT) calculations have been performed to study the visible absorbance activity of these complexes. The effect of different ligands and halogen atoms attached to PDI were studied to characterize the light-ha...
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...
Effects of membrane electrode assembly components on proton exchange membrane fuel cell performance
Bayrakceken, Ayse; Erkan, Serdar; Turker, Lemi; Eroğlu, İnci (Elsevier BV, 2008-01-01)
The objective of this study is to determine the effects of various factors on the performance of proton exchange membrane (PEM) fuel cell. These factors are membrane thickness, hot-pressing conditions of the gas diffusion layer (GDL) either onto the membrane or membrane electrode assembly (MEA) and Teflon:carbon ratio in the GDL on PEM fuel cell performance. Homemade five-layer and commercial three-layer MEAs were used in the experiments. Nafion (R) 112 and 115 which have nominal thicknesses of 50 and 125 m...
Sequential Deposition of Electrochromic MoO3 Thin Films with High Coloration Efficiency and Stability
Turel, Onur; Hacioglu, Serife O.; Coskun, Sahin; Toppare, Levent Kamil; Ünalan, Hüsnü Emrah (The Electrochemical Society, 2017-01-01)
Effect of thin film deposition route on the morphology and performance of molybdenum oxide (MoO3) based electrochromic devices was investigated. For the deposition of thin films, a sequential deposition method, which includes ultrasonic spray pyrolysis (USP) and thermal evaporation methods was used. Films deposited solely using either USP or thermal evaporation method were used as control samples. Following deposition, MoO3 thin films were then characterized using X-ray diffraction, X-ray photoelectron spec...
Phenomenological morphology design of hybrid organic-inorganic perovskite solar cell for high efficiency and less hysteresis
Ameri, Mohsen; Ghaffarkani, Mashhood; Ghahrizjani, Reza Taheri; Safari, Nasser; Mohajerani, Ezeddin (Elsevier BV, 2020-02-01)
In this report, a modeling approach is employed to study the effect of the grain boundaries (GBs) and their electronic activity on the performance parameters of the perovskite solar cells (PSCs). Our model is based on the 1- dimensional drift-diffusion framework to engage the electron (hole) defects formed in the GBs and the GB's location through the perovskite layer. Power conversion efficiency (PCE) of the PSC is optimized with regards to the perovskite layer thickness, GBs location and perovskite layer b...
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.