Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Discharged Maximum Current Density of Vanadium Redox Flow Battery with Increased Electrolyte Flow Rate

바나듐계 산화-환원 유동 전지의 최대 방전전류와 유량의 상관성에 대한 실험적 연구

  • 김정명 (창원대학교 대학원 기계공학과) ;
  • 박희성 (창원대학교 대학원 기계공학과)
  • Received : 2016.05.30
  • Accepted : 2016.10.08
  • Published : 2016.12.01
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Abstract

All-vanadium redox flow batteries (VRFBs) are used as energy storage systems for multiple intermittent power sources. The performance of the VRFBs depends on the materials and operating conditions. Hence, performance characterization is of great importance in the development of the VRFBs. This paper proposes a method for determining the maximum current density based on stoichiometric ratios. A laboratory-scaled VRFB with a projected electrode area of $25cm^2$ is electrically charged when the state of the charge has begun from 0.6. The operating conditions, such as current density and volumetric flow rate are important in the test, and the maximum current density is influenced by the mass transfer coefficient. The results show that increasing the electrolyte flow rate from 5 mL/min to 60 mL/min enhances the maximum current density up to $520mA/cm^2$.

바나듐 전해질 산화-환원 흐름전지(vanadium redox flow batteries, VRFBs)는 간헐적 에너지 저장 시스템의 에너지 저장장치로 사용된다. VRFBs는 재료 및 동작조건에 따라 성능의 차이를 보이며, 각 성능특성에 따른 VRFBs개발이 요구된다. 본 연구에 사용된 단위셀은 반응면적 $25cm^2$이며, 전해액은 0.6의 충전상태를 나타낸다. 방전전류밀도를 0에서 $520mA/cm^2$ 까지 변화시키면서 동시에 전해질 유량도 5mL/min에서 60mL/min까지 변화시켰다. 동일한 입구 전해액 상태에 따른 방전 성능 평가를 위해 4개의 탱크를 사용한 비순환 시스템을 구축하였다. 본 논문은 유량 및 전류밀도의 변화에 대한 단자전압을 측정하였으며, $25cm^2$ 반응면적을 가지는 바나듐계 산화-환원 유동전지 시스템의 최대전류밀도에 대한 실험식을 도출하였다.

Keywords

Acknowledgement

Supported by : 한국연구재단

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