| Title |
Effect of Asymmetric Substituents in Viologen Anode Electrolyte on Redox Flow Characteristics |
| Authors |
오민성(Min-Sung OH) ; 황승혜(Seung-Hae Hwang) ; 신경희(Kyung-hee Shin) ; 진창수(Chang-Soo Jin) ; 김성수(Sung-soo Kim) |
| DOI |
https://doi.org/10.5370/KIEE.2023.72.11.1507 |
| Keywords |
AORFB(all organic redox flow battery); Energy stroage; Electolytes; Safety; Viologen; Water Solubility |
| Abstract |
Redox flow batteries have received much attention due to their long cycle life and safety. However, in order to improve the problem of relatively low energy density and the use of strong acid electrolytes such as sulfuric acid, research on all organic redox flow batteries (AORFB) is actively underway. In this paper, an ester group and an ammine group were introduced to improve solubility through hydrogen bonding at the two N positions of 4,4`-bipyridyl, respectively. The synthesized material exhibited high solubility at 2.24 M, which surpassed that of previously reported materials (1.4 ∼ 1.6 M). In the cell test, the initial discharge capacity was 1.8 [Ah/L]. After 500 cycles, both Coulombic efficiency and capacity retention remained at 99.1% and 90.5%., respectively. |