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http://dx.doi.org/10.18770/KEPCO.2022.08.02.181

Study and Recovery on the Capacity Loss after the Long Charge-discharge Operation of VRFB-ESS  

Hai-Kyung, Seo (KEPCO Research Institute, Korea Electric Power Corporation)
Wonshik, Park (KEPCO Research Institute, Korea Electric Power Corporation)
Jae-woo, Park (KEPCO Research Institute, Korea Electric Power Corporation)
Kangsan, Kim (KEPCO Research Institute, Korea Electric Power Corporation)
Hansol, Choi (KEPCO Research Institute, Korea Electric Power Corporation)
Publication Information
KEPCO Journal on Electric Power and Energy / v.8, no.2, 2022 , pp. 181-187 More about this Journal
Abstract
As the charges/discharges of VRFB-ESS were repeated during 150cycles or more, the capacity of electrolyte in VRFB-ESS was decreased little by little. It results from the decreasing of the level of anolyte and the increasing of the valance value of the catholyte. Then, we tried to recover the capacity loss with 3 different ways. The first way was that the levels of anolyte and catholyte were allowed to be evenly equalized when the difference in the levels of two different electrolytes were severe. The second one was to lessen the valance value of the catholyte through the reduction reaction to 4-valant ions of 5-valant ions in the catholyte with the reductant, oxalic acid. The last one was that the all electrolytes of analyte and catholyte were allowed to be electro-chemically reduced to 3.5 of the valance value by oxidizing new electrolyte with 3.5 valance ions. The last way was the most effective to recover the capacity loss.
Keywords
Vanadium Redox Flow Battery(VRFB); anloyte; catholyte; valance value; reductant; releveling; electro-chemically reduction;
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