全钒液流电池隔膜Nafion与SPEEK改性研究进展

Research progress on Nafion and SPEEK modification of all vanadium redox flow battery separator

Nafion是全钒液流电池(VRFB)中应用最为广泛的隔膜,其具有较高的质子电导率,但对金属钒离子的选择性较差且价格较高。作为Nafion隔膜的有力替代品,磺化聚醚醚酮膜(SPEEK)对金属钒离子的选择性较强,但其稳定性与质子电导率仍需改善,目前常通过改性的方式来提升电池隔膜的性能。Nafion隔膜改性方法主要包括有机物改性、无机物改性和表面改性,SPEEK隔膜改性方法主要包括有机物改性、无机物改性和交联改性。对各种改性方法的研究进展进行了综述,并对其他常见的非氟类隔膜如磺化聚酰亚胺(SPI)、磺化聚醚砜(SPES)、磺化聚芳醚酮(SPAEK)等的改性研究现状进行了总结。未来,隔膜研究可从成本、性能、技术可行性3个方面寻求突破,为我国全钒液流电池的大规模应用奠定基础。

Nafion is the most widely used separator in all vanadium flow batteries(VRFB),which has high proton conductivity,but poor selectivity for metal vanadium ions and high price.As powerful substitute for Nafion diaphragm,sulfonated polyether ether ketone membrane(SPEEK)has strong selectivity for metal vanadium ions,but its stability and proton conductivity still need to be improved.At present,the performance of battery diaphragm is often improved by modification.Nafion membrane modification method mainly involves organic modification,inorganic modification and surface modification,SPEEK membrane modification method mainly involves organic modification,inorganic modification and crosslinking modification.The research progress of various modification methods was reviewed,and the modification status of other common non-fluoride membranes such as sulfonated polyimide(SPI),sulfonated polyether sulfone(SPES)and sulfonated polyether ketone(SPAEK)was summarized.In the future,diaphragm research can be conducted from cost to performance.In the future,the diaphragm research can seek breakthroughs from the three aspects of cost,performance and technical feasibility,and lay the foundation for the large-scale application of vanadium flow batteries in China.