Influence of Si on the Electrolyte Properties of Vanadium Redox Flow Battery
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摘要: 通过循环伏安、交流阻抗和充放电等测试方法,研究了不同含量硅杂质对钒电池正极电解液电化学性能和电池性能的影响。结果表明:电解液中硅含量达到0.030 g/L时,电解液中V(IV)离子的扩散系数从(1.43~2.32)×10-6 cm2/s降低至(1.23~1.99)×10-6 cm2/s,反应电荷转移电阻从1.188Ω·cm2增大到1.593Ω·cm2,降低了电解液的电化学活性和V(IV)/V(V)电对反应可逆性;电池的容量衰减率和能量衰减率明显增大,平均库伦效率和能量效率分别降低了1.39%和3.23%。Abstract: The effects of Si on the electrochemical performance and battery performance of the positive electrolyte of vanadium redox flow battery(VRFB) were studied by cyclic voltammetry,electrochemical impedance spectrum and charge-discharge test.The results indicate that with the content of Si in the electrolyte at 0.03 g/L,the diffusion coefficients of V(IV) species are decreased from(1.43~2.32)×10-6 cm2/s to(1.23~1.99)×10-6 cm2/s,and the value of electron transfer resistance is increased from 1.188 Ω·cm2 to 1.593 Ω·cm2,resulting in the decrease in both of the electrochemical activity and the reversibility of V(IV)/V(V) reaction of the electrolyte.Meanwhile,the decay rates of capacity and energy of the battery are increased significantly,with the average coulombic efficiency and the average energy efficiency decreased by 1.39% and 3.23%,respectively.
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Key words:
- vanadium redox flow battery /
- positive electrolyte /
- Si /
- electrochemical performance
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