关键词: 离子选择性传导通道, 膜, 传统亲水基团, 孔径筛分, 非传统亲水基团, 全钒液流电池

Abstract:

Vanadium flow battery (VFB) has received increasing attention in large-scale energy storage due to their attractive merits of large storage capacity, adjustable power and capacity, and no cross-contamination of redox-active materials. Commercialized perfluorosulfonic acid membranes are limited in VFB application due to the high cost and low ion selectivity. Therefore, nonperfluorinated polymer membranes have been comprehensively researched. So far, alternative membranes are facing challenges in an intrinsic trade-off between ion transport and selectivity. Meanwhile, the chemical stability of alternative membrane in strongly acidic and oxidizing condition for VFBs is also a challenge. It is the key to achieving high ion-selective transport and high stability to optimize ion-selective transport channels in the membrane on basic of the structure-performance relationship. The ion-selective transport channels based on traditional hydrophilic groups, size sieving effects and non-traditional hydrophilic groups were discussed, respectively. The current progress and problems of membrane were comprehensively overviewed, and the research directions of construction of ion-selective transport channels in membranes were pointed out for large-scale VFB application.

Key words: ion-selective transport channels, membrane, traditional hydrophilic group, size sieving effects, non-traditional hydrophilic group, vanadium flow battery