A Sustainable Redox‐Flow Battery with an Aluminum‐Based, Deep‐Eutectic‐Solvent Anolyte

• DOI: 10.1002/anie.201703399
• Publication Date: 2017-05-11T20:10:52Z
• Authors: Changkun Zhang; Yu Ding; Leyuan Zhang; Xuelan Wang; Yu Zhao; Xiaohong Zhang; Guihua Yu
• Keywords: Flow battery; Deep eutectic solvent

Abstract Nonaqueous redox‐flow batteries are an emerging energy storage technology for grid systems, but the development of anolytes has lagged far behind that catholytes due to major limitations redox species, which exhibit relatively low solubility and inadequate potentials. Herein, aluminum‐based deep‐eutectic‐solvent is investigated as anolyte batteries. The deep‐eutectic solvent demonstrated a significantly enhanced concentration circa 3.2 m in potential 2.2 V vs. Li + /Li. electrochemical measurements highlight reversible volumetric capacity 145 Ah L −1 density 189 Wh or 165 kg have been achieved when coupled with I 3 − /I catholyte. prototype cell also extended use Br 2 ‐based catholyte, exhibiting higher voltage theoretical over 200 . synergy highly abundant, dendrite‐free, multi‐electron‐reaction aluminum anodes environmentally benign reveals great towards cost‐effective, sustainable