KEPCO Journal on Electric Power and Energy

Korea Electric Power Corporation (한국전력공사)
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Study and Recovery on the Capacity Loss after the Long Charge-discharge Operation of VRFB-ESS

장시간 충방전에 따른 VRFB-ESS의 용량 손실 회복에 대한 연구

  • 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)
  • Received : 2022.03.30
  • Accepted : 2022.09.16
  • Published : 2022.12.30
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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

Acknowledgement

This study has been proceeded as a self-funded internal research project(No. R16EA02) of the Korea Electric Power Corporation (KEPCO) since 2016.

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