Highly persistent triphenylamine-based catholyte for durable organic redox flow batteries

Authors
Kwon, GiyunLee, KyunamYoo, JaekyunLee, SechanKim, JihyeonKim, YoungsuKwon, Ji EonPark, Soo YoungKang, Kisuk
Issue Date
2021-11
Publisher
Elsevier BV
Citation
Energy Storage Materials, v.42, pp.185 - 192
Abstract
Organic redox flow batteries (ORFBs) have recently drawn significant attention as cost-effective and scalable energy storage systems, utilizing the distinct features of redox-active organic materials (ROMs), which offer chemical diversity and potential mass-scalability. Nevertheless, their inferior cycle performance compared with that of conventional inorganic-based RFBs is one of the major drawbacks limiting their practical application, which is often attributable to the chemical instability of charged ROMs during long-term operation. Herein, we present an ultra-stable triphenylamine-based molecule, tris(4-methoxyphenyl)amine or 3MTPA, which exhibits a highly stable redox reaction and rapid kinetics as a catholyte in non-aqueous media. It is demonstrated that the 3MTPA catholyte exhibits exceptionally robust radical cation stability, enabling its retention of near the theoretical capacity even after 168 h of high temperature storage in a fully charged state, while most known ROMs have not been able to achieve it and suffer from the significant degradation. Moreover, a flow cell exploiting 3MTPA is capable of delivering an unprecedentedly high capacity retention of 99.998% per cycle over 1400 cycles, opening up a new pathway toward highly durable ORFBs.
Keywords
GAUSSIAN-BASIS SETS; ENERGY-STORAGE; ATOMS LI; DERIVATIVES; ELECTROLYTES; TEMPERATURE; MOLECULE; PROGRESS; Energy storage; Redox flow batteries; Redox-active organic materials; Non-aqueous organic redox flow batteries
ISSN
2405-8297
URI
https://pubs.kist.re.kr/handle/201004/116239
DOI
10.1016/j.ensm.2021.07.006
Appears in Collections:
KIST Article > 2021
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