- Professor Seung-woo Hong's research team proposes a high-voltage redox flow battery
The research team of Professor Seung-woo Hong from the Department of Chemistry at Sookmyung Women’s University and the research team of Professor Hyun-seo Ahn and Professor Eun-ji Shim from Yonsei University proposed the development of an efficient redox flow battery that can solve the problem of storing high-capacity renewable energy.
(From left) Professor Seung-woo Hong, PhD student Hye-ri Jeon
This research was carried out with the support of the emerging research projects from the National Research Foundation of Korea, and the results were published online on October 5 in ACS Materials Letters (IF = 11.170, top 12.029% in the field of Materials Science and Multiphysics), an internationally renowned journal. The paper was co- authored by Hye-ri Jeon, a PhD student in the Department of Chemistry, as a co-lead author, and Professor Seung-woo Hong as the corresponding author.
(Title of Paper: High-Voltage Symmetric Nonaqueous Redox Flow Battery Based on Modularly Tunable [Ru2M(μ3- O)(CH3CO2)6(py)3] (M = Ru, Mn, Co, Ni, Zn) Cluster Compounds with Multielectron Storage Capability)
The need to develop renewable energy technology is emerging as a way to solve various environmental problems caused by consuming fossil fuels, but renewable energy has problems from the perspective of storing and distributing energy. The redox flow battery presented as one method for solving this problem can store large-scale energy.
Conventional commercialized batteries are powered using vanadium or zinc in an aqueous solution, but they have the disadvantage of having low voltage. Accordingly, it is necessary to develop a redox flow battery having a high voltage and energy density, and because inorganic compounds have various redox potentials, they can be used as anode- cathode symmetric electrolytes capable of multi-electron reactions.
[Description: High-voltage redox flow battery using modularly tunable Ru multi-electron inorganic compounds]
To synthesize a multi-electron Ru metal compound containing Ru and a first-cycle transition metal, the research teams appropriately adjusted the structure and electrostatic properties of the organic ligand assigned to the metal and used it as a symmetric electrolyte in a redox flow battery. Through this, it was possible to freely adjust the redox potential of the multi-electron Ru metal compound, proved that the battery voltage can be adjusted up to 2.4 V, and confirmed that it operates stably even in various charge/discharge tests. In addition, they have succeeded in proving through computational chemistry that Ru compounds can perform multi-electron reactions and can be stably operated.
Based on this inorganic chemical-electrochemical joint research method, it is expected that various symmetric electrolytes that can cover a wider range of voltages can be developed in the future, and it is expected that redox flow batteries that can operate stably can be made and commercialized.
Professor Seung-woo Hong of the research team that conducted this study explained the significance of this research by saying, “A non-aqueous symmetric electrolyte that can be used in redox flow batteries can be obtained using a relatively simple inorganic synthesis method, and we have developed a method to adjust the battery voltage in the desired direction through the design of metal compounds,” and “we expect the research to be a basic data for creating inexpensive, stable, and commercially-usable symmetric electrolytes in the future.”