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Modeling the effect of temperature on performance of an iron-vanadium redox flow battery with deep eutectic solvent (DES) electrolyte

Modeling the effect of temperature on performance of an iron-vanadium redox flow battery with deep eutectic solvent (DES) electrolyte
Modeling the effect of temperature on performance of an iron-vanadium redox flow battery with deep eutectic solvent (DES) electrolyte
Extensive models have been developed to study the performance of aqueous redox flow batteries, especially for all-vanadium flow battery. Nevertheless, there are few established models to study the non-aqueous deep eutectic solvent (DES)-based flow batteries, which have wider electrochemical window and higher energy density than do the aqueous redox flow batteries. In this study, a stationary two-dimensional model is set up to study the performance of iron-vanadium redox flow battery using DES as electrolyte, in which the property parameters of the DES are experimentally determined. The effects of temperature on the over-potentials, pump power loss, distribution of ions concentration and local current density are studied. The simulation results show that with the increase of temperature, the over-potentials decrease mildly; the electrochemical reactions inside the DES-electrolyte redox flow battery mainly happen in the area close to the membrane, which is different from the aqueous one, and the rise of temperature also leads to an improvement of electrode utilization. For the DES electrolyte with higher viscosity, the pump power loss could not be neglected. It is found that the pumping loss of the entire porous electrode largely decreases from 0.138 W at 25 °C to 0.022 W at 55 °C (with 84.05% reduction). These results are in good agreement with the experimental outcomes. Therefore, this model can be applied to predict the performance of DES based battery and further to develop new kinds of non-aqueous flow batteries.
Deep eutectic solvent (DES), Iron-vanadium redox flow battery, Numerical model, Operating temperature, Porous electrode
0378-7753
1-10
Xu, Juncai
b75d6ca3-a311-45b1-a088-0d4297692aff
Ma, Qiang
2db214be-cd4d-4d13-8709-e69e71eecd30
Xing, Lei
2d4491db-9d7c-4fda-bb15-2ae800e0dd2b
Li, Huanhuan
21955b31-cc2b-4bcc-b4ee-5b850042b9c5
Leung, Pui Ki
71c40c3f-3bbf-42ea-b850-5516d46891df
Yang, Weiwei
f1002a09-2a38-4287-8459-b3655f40a736
Su, Huaneng
aed800d2-c72b-4940-bf40-bd689ae46d36
Xu, Qian
c14c91f5-4c68-40d6-a2fc-4b30dfbd3389
Xu, Juncai
b75d6ca3-a311-45b1-a088-0d4297692aff
Ma, Qiang
2db214be-cd4d-4d13-8709-e69e71eecd30
Xing, Lei
2d4491db-9d7c-4fda-bb15-2ae800e0dd2b
Li, Huanhuan
21955b31-cc2b-4bcc-b4ee-5b850042b9c5
Leung, Pui Ki
71c40c3f-3bbf-42ea-b850-5516d46891df
Yang, Weiwei
f1002a09-2a38-4287-8459-b3655f40a736
Su, Huaneng
aed800d2-c72b-4940-bf40-bd689ae46d36
Xu, Qian
c14c91f5-4c68-40d6-a2fc-4b30dfbd3389

Xu, Juncai, Ma, Qiang, Xing, Lei, Li, Huanhuan, Leung, Pui Ki, Yang, Weiwei, Su, Huaneng and Xu, Qian (2020) Modeling the effect of temperature on performance of an iron-vanadium redox flow battery with deep eutectic solvent (DES) electrolyte. Journal of Power Sources, 449, 1-10, [227491]. (doi:10.1016/j.jpowsour.2019.227491).

Record type: Article

Abstract

Extensive models have been developed to study the performance of aqueous redox flow batteries, especially for all-vanadium flow battery. Nevertheless, there are few established models to study the non-aqueous deep eutectic solvent (DES)-based flow batteries, which have wider electrochemical window and higher energy density than do the aqueous redox flow batteries. In this study, a stationary two-dimensional model is set up to study the performance of iron-vanadium redox flow battery using DES as electrolyte, in which the property parameters of the DES are experimentally determined. The effects of temperature on the over-potentials, pump power loss, distribution of ions concentration and local current density are studied. The simulation results show that with the increase of temperature, the over-potentials decrease mildly; the electrochemical reactions inside the DES-electrolyte redox flow battery mainly happen in the area close to the membrane, which is different from the aqueous one, and the rise of temperature also leads to an improvement of electrode utilization. For the DES electrolyte with higher viscosity, the pump power loss could not be neglected. It is found that the pumping loss of the entire porous electrode largely decreases from 0.138 W at 25 °C to 0.022 W at 55 °C (with 84.05% reduction). These results are in good agreement with the experimental outcomes. Therefore, this model can be applied to predict the performance of DES based battery and further to develop new kinds of non-aqueous flow batteries.

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More information

Accepted/In Press date: 21 November 2019
e-pub ahead of print date: 4 December 2019
Published date: 15 February 2020
Keywords: Deep eutectic solvent (DES), Iron-vanadium redox flow battery, Numerical model, Operating temperature, Porous electrode

Identifiers

Local EPrints ID: 438550
URI: http://eprints.soton.ac.uk/id/eprint/438550
ISSN: 0378-7753
PURE UUID: df7f3651-ce1d-4c21-8a5b-8dd799e3450b

Catalogue record

Date deposited: 16 Mar 2020 17:30
Last modified: 25 Nov 2021 20:32

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Contributors

Author: Juncai Xu
Author: Qiang Ma
Author: Lei Xing
Author: Huanhuan Li
Author: Pui Ki Leung
Author: Weiwei Yang
Author: Huaneng Su
Author: Qian Xu

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