Bi-functional effects of lengthening aliphatic chain of phthalimide-based negative redox couple and its non-aqueous flow battery performance at stack cell

초록

Effects of lengthening an aliphatic chain of a phthalimide-based negative redox couple for non-aqueous flowbatteries are examined. Theworking voltage and solubility of N-butylphthalimide are 0.1 V lower and four times greater (2.0M) than those of methyl-substituted phthalimide. These enhanced properties are attributed to a lower packing density. Consequently, the energy density of the proposed redox couple is greatly enhanced from butyl substitution. Furthermore, the results of the stack flow cell test with N, N, N' ,N'-tetramethyl-p-phenylenediamine positive redox couple showadvantageous features of this non-aqueous flow battery system: a stable Coulombic efficiency and high working voltage. (C) 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license.

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