Improved broad temperature adaptability and energy density of vanadium redox flow battery based on sulfate-chloride mixed acid by optimizing the concentration of electrolyte
Improved broad temperature adaptability and energy density of vanadium redox flow battery based on sulfate-chloride mixed acid by optimizing the concentration of electrolyte
复制标题
通过优化电解液浓度提高硫酸盐-氯化物混合酸全钒液流电池的宽温度适应性和能量密度
DOI：
10.1016/j.jpowsour.2019.01.049
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发表时间：
2019-03-01
影响因子：
9.2
通讯作者：
Huang, Jing
中科院分区：
文献类型：
--
作者：
Yang, Yadong;Zhang, Yimin;Huang, Jing
为了提高基于硫酸盐-氯化物混合酸电解质的钒氧化还原液流电池的能量密度和宽温度适应性，研究了电解质在宽温度范围内的稳定性和充放电行为。20-50摄氏度)进行了系统的研究。钒离子静态稳定性试验表明，当电解液中氯离子浓度为6.0 ~ 7.0 M，硫酸盐浓度为2.0 ~ 3.0 M时，2.4 M的钒浓度可保持10天的稳定。氯离子静态稳定性试验表明，氯离子浓度不超过6.4 m时，可以避免氯化氢的挥发。优化电解质组成的钒氧化还原液电池性能表明，硫酸盐-氯混合酸电解质可以在更宽的温度范围内工作，充电截止电压必须小于1.7 V才能防止氯的析出。本工作不仅系统地优化了混合酸电解质的组成，而且为钒氧化还原液流电池在极端环境下的工程应用提供了理论指导。
In order to improve the energy density and broad temperature adaptability of vanadium redox flow battery based on sulfate-chloride mixed acid electrolyte, the stability and charge/discharging behavior of electrolytes at a broad temperature range (.20-50 degrees C) are investigated systematically. The static stability tests of vanadium ions show that the 2.4 M vanadium concentration can keep stable for 10 days with the electrolyte composition of chloride ion concentration is 6.0-7.0 M and sulfate concentration is 2.0-3.0 M. However, the static stability tests of chloride ions indicate that volatilization of hydrogen chloride can be avoided when chloride ion concentration is not exceeding 6.4 M. The cell performance of vanadium redox flow battery with optimized electrolyte compositions indicates that the sulfate-chloride mixed acid electrolyte can operate at a wider temperature range and the charge cut-off voltage must be less than 1.7 V to prevent the chlorine evolution. This work not only systematically optimizes the composition of mixed acid electrolyte, but also provides theoretical direction to the engineering application of vanadium redox flow battery at extreme environment.