复合添加剂对钒电池正极电解液性能的影响

摘要为了提高钒电池电解液的性能，选取了3种复合添加剂，研究了复合添加剂对钒电池正极电解液稳定性和电化学性能的影响。利用电化学方法制备了2 mol/L的全钒液流电池正极5价钒离子电解液，采用临界胶束浓度法得到复合添加剂的配比为：1% KHSO₄+3 mmol/L SDBS（十二烷基苯磺酸钠）、1% KHSO₄+2 mmol/L D-山梨醇、1% KHSO₄+2 mmol/L CTAB（十六烷基三甲基溴化铵），并考察添加剂加入电解液后的稳定性与电化学性能。通过XRD分析手段，对电解液沉淀物的成分进行了表征。研究表明：添加剂的加入，并不会引起钒离子价态的变化，1% KHSO₄+2 mmol/L CTAB加入后，电解液峰电位差减小12 mV，峰电流增加9.8 mA，说明CTAB与KHSO₄在合适配比下，能够有效提高正极电解液的稳定性及可逆性，添加剂的引入并未引起电解液沉淀物的物相组成变化，电解液性能显著提高。

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	李林波
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	任军权
	罗帅

关键词：钒电池电解液复合添加剂稳定性电化学性能

Abstract： In order to improve the electrolyte performance of vanadium redox flow battery, three composite additives were selected to investigate their effect on the stability and electrochemical properties systematically. The vanadium redox flow battery electrolyte of 2 mol/L pentavalent vanadium solution was prepared by electrochemical technology, with the ratio of composite additives was acquired by critical micelle concentration method: 1% KHSO₄+3 mmol/L SDBS(sodium dodecyl benzene sulfonate), 1% KHSO₄+2 mmol/L D-sorbitol, 1% KHSO₄+2 mmol/L CTAB(cetyl trimethyl ammonium bromide). The effect of those composite additives on the stability and electrochemical properties of electrolyte were studied. The chemical composition of the electrolyte precipitate was characterized by XRD analysis. The results show that additives cannot cause the valence transition of vanadium ions. After adding 1% KHSO₄+2 mmol/L CTAB, the difference of peak potential for electrolyte decreases by 12 mV while the peak current increases by 9.8 mA, which indicates that the stability and reversibility of the electrolyte are improved by the addition of CTAB+KHSO₄ with optimized ratio. The phase composition of the electrolyte precipitate is not changed and the electrolyte performance is significantly improved by the addition of CTAB+KHSO₄.

Keywords： vanadium redox flow battery； electrolyte； composite additives； stability； electrochemical performance

Received 2019-12-11;

Corresponding Authors: 李林波,E-mail:419476109@qq.com。 Email: 419476109@qq.com

About author: 李林波(1973-),男,博士,教授,主要从事冶金二次资源高效利用。

引用本文:

李林波, 郭盼, 任军权, 罗帅.复合添加剂对钒电池正极电解液性能的影响[J]. 化学工业与工程, 2020,37(5): 46-52

Li Linbo, Guo Pan, Ren Junquan, Luo Shuai.Effect of Composite Additives on Positive Catholyte Electrolyte Performance of Vanadium Redox Flow Battery[J]. Chemcial Industry and Engineering, 2020,37(5): 46-52

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