A modelling and simulation study of soluble lead redox flow battery: Effect of presence of free convection on the battery characteristics

Nandanwar, Mahendra and Kumar, Sanjeev (2019) A modelling and simulation study of soluble lead redox flow battery: Effect of presence of free convection on the battery characteristics. In: JOURNAL OF POWER SOURCES, 412 . pp. 536-544.

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Abstract

In this paper, we develop a mathematical model for soluble lead redox flow battery. The model accounts for simultaneous effect of forced convection and induced free convection in electrolyte domain of the battery. It predicts existence of dominant free convection over the forced convection in vicinity of the electrodes. The predictions suggests that both, electrode kinetics and ion transfer assisted by free convection alone, controls charge-discharge characteristics of the battery. The free convection augments ion transfer rate to the electrodes. By virtue of this, limiting current density at the electrodes increases to twice the theoretical limit under forced convection. The predictions coherently explains Collins et al. 1]'s observations of high charge efficiencies when charging currents are higher than the theoretical limit. Also, the model consistently explains Pletcher et al. 2]'s observation of insensitivity of the battery characteristics to the electrolyte flow rate. The model predicts satisfactory battery performance even at microscopic (mu L s(-1)) flow rates which opens up the possibility for significant reduction in electrolyte pumping cost.

Item Type:	Journal Article
Publication:	JOURNAL OF POWER SOURCES
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	Copyright of this article belongs to ELSEVIER SCIENCE BV
Keywords:	Modelling and simulation; Soluble lead redox flow battery; Charge-discharge characteristics; Forced convection; Free convection; Electrode kinetics
Department/Centre:	Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	12 Feb 2019 04:51
Last Modified:	12 Feb 2019 04:51
URI:	http://eprints.iisc.ac.in/id/eprint/61690

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