Organic/inorganic materials are investigated as additives to improve the stability of a vanadium electrolyte for a vanadium redox flow battery (VRFB) at operating temperatures of 25 °C and 40 °C. Among these materials, the most effective additive is chosen based on the thermal stability and electrochemical performance with a long inhibition time. Through precipitation time and electrochemical measurements, the results show that the best inhibition effect is achieved by adding sodium pyrophosphate dibasic (SPD, H2Na2O7P2) as an additive at a considerably high H2SO4 concentration (3M) electrolyte, indicating an improved redox reversibility and electrochemical activity. Nonflow cell assembled with the SPD additive exhibits larger discharge capacity retentions of 40% than a blank solution with the retentions of 2% at 600 cycles at 40 °C. In the case of flow cell, the capacity retention on the SPD additive shows 55.4%, which is 5.3% higher than the blank solution at 40 °C and 180 cycles. The morphology of the precipitation is investigated by SEM, which exhibits more severe V2O5 precipitation amount on the carbon felt electrode used in the blank electrolyte at 40 °C, which causes larger capacity losses compared to cells assembled with the SPD additive electrolyte.
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November 2017
Research-Article
Effect of Phosphate Additive for Thermal Stability in a Vanadium Redox Flow Battery Available to Purchase
Sun-Hwa Yeon,
Sun-Hwa Yeon
Energy Storage Laboratory,
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea
e-mail: [email protected]
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea
e-mail: [email protected]
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Jae Young So,
Jae Young So
Energy Storage Laboratory,
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea;
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea;
Department of Energy Engineering,
Hanyang University,
222, Wangsimni-ro, Seongdong-gu,
Seoul 133-791, South Korea
Hanyang University,
222, Wangsimni-ro, Seongdong-gu,
Seoul 133-791, South Korea
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Jin Hee Yun,
Jin Hee Yun
Energy Storage Laboratory,
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea
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Se-Kook Park,
Se-Kook Park
Energy Storage Laboratory,
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea
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Kyoung-Hee Shin,
Kyoung-Hee Shin
Energy Storage Laboratory,
Korea Institute of Energy Research,
Daejeon 305-343, South Korea
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong
,Daejeon 305-343, South Korea
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Chang-Soo Jin,
Chang-Soo Jin
Energy Storage Laboratory,
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea
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Yun Jung Lee
Yun Jung Lee
Department of Energy Engineering,
Hanyang University,
222, Wangsimni-ro, Seongdong-gu,
Seoul 133-791, South Korea
Hanyang University,
222, Wangsimni-ro, Seongdong-gu,
Seoul 133-791, South Korea
Search for other works by this author on:
Sun-Hwa Yeon
Energy Storage Laboratory,
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea
e-mail: [email protected]
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea
e-mail: [email protected]
Jae Young So
Energy Storage Laboratory,
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea;
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea;
Department of Energy Engineering,
Hanyang University,
222, Wangsimni-ro, Seongdong-gu,
Seoul 133-791, South Korea
Hanyang University,
222, Wangsimni-ro, Seongdong-gu,
Seoul 133-791, South Korea
Jin Hee Yun
Energy Storage Laboratory,
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea
Se-Kook Park
Energy Storage Laboratory,
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea
Kyoung-Hee Shin
Energy Storage Laboratory,
Korea Institute of Energy Research,
Daejeon 305-343, South Korea
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong
,Daejeon 305-343, South Korea
Chang-Soo Jin
Energy Storage Laboratory,
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea
Korea Institute of Energy Research,
102, Gajeong-ro, Yuseong,
Daejeon 305-343, South Korea
Yun Jung Lee
Department of Energy Engineering,
Hanyang University,
222, Wangsimni-ro, Seongdong-gu,
Seoul 133-791, South Korea
Hanyang University,
222, Wangsimni-ro, Seongdong-gu,
Seoul 133-791, South Korea
1Corresponding author.
Manuscript received July 14, 2017; final manuscript received September 20, 2017; published online October 17, 2017. Assoc. Editor: Kevin Huang.
J. Electrochem. En. Conv. Stor. Nov 2017, 14(4): 041007 (11 pages)
Published Online: October 17, 2017
Article history
Received:
July 14, 2017
Revised:
September 20, 2017
Citation
Yeon, S., So, J. Y., Yun, J. H., Park, S., Shin, K., Jin, C., and Lee, Y. J. (October 17, 2017). "Effect of Phosphate Additive for Thermal Stability in a Vanadium Redox Flow Battery." ASME. J. Electrochem. En. Conv. Stor. November 2017; 14(4): 041007. https://doi.org/10.1115/1.4038019
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