Improved All-Vanadium Redox Flow Batteries using Catholyte Additive and a Cross-linked Methylated Polybenzimidazole Membrane
Source abstract
Abstract
Through controlling the cross-linking and thickness of low-cost methylated polybenzimidazole anion exchange membranes and by using imidazolium chloride as a catholyte additive, we improved the energy efficiency at a current density of 100 mA cm–2 for all-vanadium redox flow batteries (RFBs) to 82%, compared to 76% with a Nafion 212 membrane and 67–78% for previously reported polybenzimidazole membranes with standard electrolyte. Moreover, thermal stability analysis of the charged catholytes, by direct observations of vanadium precipitation and variable temperature 51V nuclear magnetic resonance, confirmed an optimized content of 0.16 M of the electrochemically inert additive in 1.6 M vanadium solution, consistent with the electrochemical data. The imidazolium chloride additive with such a low concentration is sufficient to induce interaction with vanadium species in catholyte. This explains the improved electrolyte stability and enhanced cycling efficiency.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advanced battery technologies research · Electrocatalysts for Energy Conversion · Supercapacitor Materials and Fabrication
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Transfercenter Sustainable Electrochemistry, Saarland University and KIST Europe, 66123 Saarbrücken, Germany
Fuel Cell Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
Division of Energy and Environment Technology, KIST School, University of Science and Technology, Seoul 02792, Republic of Korea
Green School, Korea University, 02841 Seoul, Republic of Korea
Center for Membranes, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea
Institute for Applied Materials—Energy Storage Systems, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
Helmholtz Institute Ulm, Helmholtzstraße 11, 89081 Ulm, Germany
Funding
Allianz Industrie Forschung · Korea Institute for Advancement of Technology · Korea Institute of Science and Technology
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