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A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery
Published on: February 13, 2017
An organic super-electron-donor as a high energy density negative electrolyte for nonaqueous flow batteries
Thomas P Vaid1, Melanie S Sanford1
1Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, USA. vaidt@umich.edu and Joint Center for Energy Storage Research (JCESR), 9700 S. Cass Avenue, Argonne, Illinois 60439, USA.
Abstract:
A highly reducing diquat-type molecule was explored as a negative electrolyte for nonaqueous redox flow batteries. The molecule displays a highly negative 2+/0 reduction potential of -1.67 V (vs. ferrocene), a low mass per electron transferred, and good solubility in CH3CN in both redox states. Moderate capacity retention is observed during electrochemical charge-discharge cycling. A pathway for decomposition during electrochemical cycling is elucidated, and this provides a clear path forward for enhancing stability.
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