KEPCO Journal on Electric Power and Energy

Korea Electric Power Corporation (한국전력공사)
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Analysis of Vanadium Ions and SOC in the Electrolytes of VRFB-ESS

VRFB-ESS용 전해질의 이온가수 분석방법 및 SOC 분석

  • Seo, Hai-Kyung (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Park, Wonshik (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Kim, Kangsan (KEPCO Research Institute, Korea Electric Power Corporation)
  • Received : 2021.07.12
  • Accepted : 2021.09.02
  • Published : 2021.12.30
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Abstract

For the detection of the state of charge in VRFB-ESS, the analyses of UV-Visible spectrometry and the measurements of potential between the anolyte and catholyte were used in parallel. This paper includes the production of 4-valant ion from VOSO4 powder, 3- and 5-valant ions from electrochemical charge of 4-valant ion and 2-valant ion from 3-valant ion. It also includes the analyses of these valance ions and unknown electrolyte at any time using UV-Visible spectrometry. Through the analyses of the valance ions in samples, the SOCs of the samples at any charge-discharge times were verified.

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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