Publication type: Conference other
Type of review: Not specified
Title: Towards rigorous thermodynamics in aqueous flow batteries : measuring activity coefficients with differential scanning calorimetry
Authors: Mourouga, Gaël
Baudrin, Emmanuel
Courty, Mathieu
Schmidt, Thomas J.
Schumacher, Jürgen
et. al: No
Conference details: 17th Symposium on Modeling and Experimental Validation of Electrochemical Energy Technologies (MODVAL 17), online, 20-22 April 2021
Issue Date: 20-Apr-2021
Language: English
Subjects: Energy storage; Flow Batteries; Thermodynamics; Modelling
Subject (DDC): 540: Chemistry
621.3: Electrical, communications, control engineering
Abstract: The field of aqueous organic redox-flow batteries (AORFBs) has been developing fast in re-cent years, and many chemistries are starting to emerge as serious contenders for grid-scale stor-age owing to their long lifetime, environmental friendliness, and low cost. Their main disadvantage, namely low energy density, can be overcome by increasing the concentration of active materials, at the cost of increasing the non-ideal behaviour of the electrolytes. Many authors have brought evidence that the dilute solution hypothesis does not hold for these systems, and that voltage or osmosis predictions should be parametrised with chemical activities rather than concentrations. Unfortunately, the activity coefficients of such novel electrolytes have not, for the most part, been reported in the literature. The present work aims to provide a fast method, both experimental and computational, for the estimation of activity coefficients at different temperatures using Differ-ential Scanning Calorimetry (DSC), the Gibbs-Helmholtz equation and the Pitzer equations. The accuracy of the method is demonstrated on common salts (NaCl, KCl, CaCl2) and applied to the all-organic TEMPTMA/Paraquat aqueous flow battery system.
Fulltext version: Published version
License (according to publishing contract): Not specified
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Published as part of the ZHAW project: Redox Flow Battery Campus
Appears in collections:Publikationen School of Engineering

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