Journal of Hydrogen and New Energy (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Study on the Electrolyte Added Chlorosulfuric Acid for All-vanadium Redox Flow Battery

바나듐 레독스 흐름 전지용 전해액으로 클로로황산 첨가에 관한 연구

  • OH, YONG-HWAN (Grad. School, Dep. Green Energy Engineering, Hoseo Univ.) ;
  • LEE, GEON-WOO (Grad. School, Dep. Green Energy Engineering, Hoseo Univ.) ;
  • RYU, CHEOL-HWI (Grad. School, Dep. Green Energy Engineering, Hoseo Univ.) ;
  • HWANG, GAB-JIN (Grad. School, Dep. Green Energy Engineering, Hoseo Univ.)
  • 오용환 (호서대학교 일반대학원 그린에너지공학과) ;
  • 이건우 (호서대학교 일반대학원 그린에너지공학과) ;
  • 유철휘 (호서대학교 일반대학원 그린에너지공학과) ;
  • 황갑진 (호서대학교 일반대학원 그린에너지공학과)
  • Received : 2016.03.25
  • Accepted : 2016.04.30
  • Published : 2016.04.30
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Abstract

The electrolyte added the chlorosulfuric acid ($HSO_3Cl$) as an additive was tested for the electrolyte in all-vanadium redox flow battery (VRFB) to increase the thermal stability of electrolyte. The electrolyte property was measured by the CV (cyclic voltammetry) method. The maximum value of a voltage and current density in the electrolyte added $HSO_3Cl$ was higher than that in the electrolyte non-added $HSO_3Cl$. The thermal stability of the pentavalent vanadium ion solution, which was tested at $40^{\circ}C$, increased by adding $HSO_3Cl$. The performances of VRFB using the electrolyte added and non-added $HSO_3Cl$ were measured during 30 cycles of charge-discharge at the current density of $60mA/cm^2$. An average energy efficiency of the VRFB was 72.5%, 82.4%, and 81.6% for the electrolyte non-added $HSO_3Cl$, added 0.5 mol of $HSO_3Cl$, and added 1.0 mol of $HSO_3Cl$, respectively. VRFB using the electrolyte added $HSO_3Cl$ was showed the higher performance than that using the electrolyte non-added $HSO_3Cl$.

Keywords

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