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Rational Development of Neutral Aqueous Electrolytes for Zinc-Air Batteries

Clark, Simon 1; Latz, Arnulf 1; Horstmann, Birger 1
1 Karlsruher Institut für Technologie (KIT)


Neutral aqueous electrolytes have been shown to extend both the calendar life and cycling stability of secondary zinc–air batteries (ZABs). Despite this promise, there are currently no modeling studies investigating the performance of neutral ZABs. Traditional continuum models are numerically insufficient to simulate the dynamic behavior of these complex systems because of the rapid, orders-of-magnitude concentration shifts that occur. In this work, we present a novel framework for modeling the cell-level performance of pH-buffered aqueous electrolytes. We apply our model to conduct the first continuum-scale simulation of secondary ZABs using aqueous ZnCl2–NH4Cl as electrolyte. We first use our model to interpret the results of two recent experimental studies of neutral ZABs, showing that the stability of the pH value is a significant factor in cell performance. We then optimize the composition of the electrolyte and the design of the cell considering factors including pH stability, final discharge product, and overall energy density. Our simulations predict that the effectiveness of the pH buffer is limited by slow mass transport and that chlorine-containing solids may precipitate in addition to ZnO.

Verlagsausgabe §
DOI: 10.5445/IR/1000079005
Veröffentlicht am 16.01.2018
DOI: 10.1002/cssc.201701468
Zitationen: 71
Web of Science
Zitationen: 66
Zitationen: 78
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 08.12.2017
Sprache Englisch
Identifikator ISSN: 1864-5631, 1864-564X
KITopen-ID: 1000079005
HGF-Programm 37.01.01 (POF III, LK 01) Fundamentals and Materials
Erschienen in ChemSusChem
Verlag Wiley-VCH Verlag
Band 10
Heft 23
Seiten 4735–4747
Nachgewiesen in Dimensions
Web of Science
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