Effect of organic additives on positive electrolyte for vanadium redox battery

Effect of organic additives on positive electrolyte for vanadium redox battery
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有机添加剂对钒氧化还原电池正极电解液的影响

DOI:
10.1016/j.electacta.2011.03.048
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发表时间:
2011-06
影响因子:
6.6
通讯作者:
Tao Wu
Tao Wu
中科院分区:
材料科学2区
文献类型:
--
作者:
Sha Li;Kelong Huang;Suqin Liu;Dong Fang;Xiongwei Wu;Dan Lu;Tao Wu

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研究了果糖、甘露醇、葡萄糖、山梨醇作为钒电池电解液添加剂的可行性。采用循环伏安法、充放电技术、电化学阻抗谱和拉曼光谱研究了添加剂对电解液性能的影响。结果表明,添加山梨糖醇的电解液制成的钒电池具有最好的电化学性能(能量效率为81.8%)。电化学阻抗谱结果表明,山梨醇的加入提高了电解液的电化学活性,这是由于山梨醇的加入增加了电解液中提供电子转移活性中心的-OH基团。拉曼光谱表明,VO 2+离子参与了与山梨醇的络合,不仅提高了V(V)电解质的溶解度,而且为V(IV)/V(V)氧化还原反应提供了更多的活性位。
Fructose, mannitol, glucose,d-sorbitol are explored as additives in electrolyte for vanadium redox battery (VRB), respectively. The effects of additives on electrolyte are studied by cyclic voltammetry (CV), charge–discharge technique, electrochemical impedance spectroscopy (EIS) and Raman spectroscopy. The results indicate that the vanadium redox cell using the electrolyte with the additive ofd-sorbitol exhibits the best electrochemical performance (the energy efficiency 81.8%). The EIS results indicate that the electrochemical activity of the electrolyte is improved by addingd-sorbitol, which can be interpreted as the increase of available (–OH) groups providing active sites for electron transfer. The Raman spectra show that VO2+ions take part in forming a complex with thed-sorbitol, which not only improve solubility of V(V) electrolyte, but also provide more activity sites for the V(IV)/V(V) redox reaction.
DOI: 10.1149/1.1390754
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