Understanding the Enhanced Electrochemical Performance of TEMPO Derivatives in Non-aqueous Lithium Ion Redox Flow Batteries

Title
Understanding the Enhanced Electrochemical Performance of TEMPO Derivatives in Non-aqueous Lithium Ion Redox Flow Batteries
Authors
홍순만구종민조상호이성수나원준옥벼리이진홍권태훈Young-Wan Kwon
Issue Date
2019-12
Publisher
Journal of industrial and engineering chemistry
Citation
VOL 80-550
Abstract
Non-aqueous lithium-ion redox flow batteries (Li-RFBs) have recently garnered much interest because of their high operating voltage and energy density. Albeit these outstanding advantages, challenges, such as poor cyclability and efficiency, still remain in employing the practical application. In an attempt to address these problems, a series of 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO) and TEMPO derivatives catholytes were prepared and investigated as redox-active materials. Electrochemical evaluation exhibited that the introduction of polar and electron-withdrawing substituents to TEMPO was able to enhance the rate capability and cycling stability, when compared to those with the neat TEMPO. Extensive analysis of the electrochemical properties revealed that the electrophilic heteroatom stabilized the radical as well as alleviated the catholyte degradation. Overall, a careful selection of redox-active species demonstrates great promise in improving the current redox flow battery technology.
URI
http://pubs.kist.re.kr/handle/201004/71270
ISSN
1226-086X
Appears in Collections:
KIST Publication > Article
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