Catalytic production of impurity-free V3.5+ electrolyte for vanadium redox flow batteries

Jiyun Heo, Jae-Yun Han, Soohyun Kim, Seongmin Yuk, Chanyong Choi, Riyul Kim, Ju-Hyuk Lee, Andy Klassen, Shin-Kun Ryi () and Hee-Tak Kim ()
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Jiyun Heo: Korea Advanced Institute of Science and Technology
Jae-Yun Han: Korea Institute of Energy Research (KIER)
Soohyun Kim: Korea Advanced Institute of Science and Technology
Seongmin Yuk: Korea Advanced Institute of Science and Technology
Chanyong Choi: Korea Advanced Institute of Science and Technology
Riyul Kim: Korea Advanced Institute of Science and Technology
Ju-Hyuk Lee: Korea Advanced Institute of Science and Technology
Andy Klassen: Avalon Battery
Shin-Kun Ryi: Korea Institute of Energy Research (KIER)
Hee-Tak Kim: Korea Advanced Institute of Science and Technology

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract The vanadium redox flow battery is considered one of the most promising candidates for use in large-scale energy storage systems. However, its commercialization has been hindered due to the high manufacturing cost of the vanadium electrolyte, which is currently prepared using a costly electrolysis method with limited productivity. In this work, we present a simpler method for chemical production of impurity-free V3.5+ electrolyte by utilizing formic acid as a reducing agent and Pt/C as a catalyst. With the catalytic reduction of V4+ electrolyte, a high quality V3.5+ electrolyte was successfully produced and excellent cell performance was achieved. Based on the result, a prototype catalytic reactor employing Pt/C-decorated carbon felt was designed, and high-speed, continuous production of V3.5+ electrolyte in this manner was demonstrated with the reactor. This invention offers a simple but practical strategy to reduce the production cost of V3.5+ electrolyte while retaining quality that is adequate for high-performance operations.

Date: 2019
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DOI: 10.1038/s41467-019-12363-7

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