Towards an all-copper redox flow battery based on a copper-containing ionic liquid.

Abstract

The first redox flow battery (RFB), based on the all-copper liquid metal salt [Cu(MeCN)4][Tf2N], is presented. Liquid metal salts (LMS) are a new type of ionic liquid that functions both as solvent and electrolyte. Non-aqueous electrolytes have advantages over water-based solutions, such as a larger electrochemical window and large thermal stability. The proof-of-concept is given that LMSs can be used as the electrolyte in RFBs. The main advantage of [Cu(MeCN)4][Tf2N] is the high copper concentration, and thus high charge and energy densities of 300 kC l(-1) and 75 W h l(-1) respectively, since the copper(i) ions form an integral part of the electrolyte. A Coulombic efficiency up to 85% could be reached.

DOI: 10.1039/c5cc06774j

Cite this paper

@article{Schaltin2016TowardsAA, title={Towards an all-copper redox flow battery based on a copper-containing ionic liquid.}, author={Stijn Schaltin and Yun Li and Neil R. Brooks and Jeroen Sniekers and Ivo F. J. Vankelecom and Koen Binnemans and Jan Fransaer}, journal={Chemical communications}, year={2016}, volume={52 2}, pages={414-7} }