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On the Stability and Reactivity of Redox Shuttles in Their Neutral and Radical Cation Forms

Published online by Cambridge University Press:  13 May 2015

Susan A. Odom ,
Matthew Casselman ,
Aman Preet Kaur ,
Selin Ergun  and
Naijao Zhang
Susan A. Odom
Affiliation:
Department of Chemistry, University of Kentucky, Lexington, KY 40506, U.S.A.
Matthew Casselman
Affiliation:
Department of Chemistry, University of Kentucky, Lexington, KY 40506, U.S.A.
Aman Preet Kaur
Affiliation:
Department of Chemistry, University of Kentucky, Lexington, KY 40506, U.S.A.
Selin Ergun
Affiliation:
Department of Chemistry, University of Kentucky, Lexington, KY 40506, U.S.A.
Naijao Zhang
Affiliation:
Department of Chemistry, University of Kentucky, Lexington, KY 40506, U.S.A.
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Abstract

The performance of aromatic compounds as redox shuttles for overcharge protection in lithium-ion batteries is quite variable and is often difficult to predict. Redox shuttles may decompose in battery electrolyte in their neutral and radical cation forms, both of which are present during overcharge protection. While hundreds of compounds have been evaluated as redox shuttle candidates and a few have stood out as top performers, the reasons for increased stability over similar candidates with slightly different structures is often unclear, and the exploration of decomposition of redox shuttles has been severely limited, restricting our ability to design improved versions of redox shuttles that do not suffer from the same reactions in lithium-ion batteries. To better understand the stability and reactivity of redox shuttles (also relevant to the improvement of positive electrode materials in non-aqueous redox flow batteries) our research has focused on measuring the stability of neutral and oxidized forms of redox shuttle candidates as well as using a variety of spectroscopic methods to analyze the byproducts of decomposition, both from radical cations generated in model solvents and electrolytes from postmortem analysis of failed batteries.

Keywords

chemical reactionenergy storageorganic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1740: Symposium Z – Materials Challenges for Energy Storage across Multiple Scales , 2015 , mrsf14-1740-z03-10
Copyright
Copyright © Materials Research Society 2015 

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