全钒液流电池隔膜在钒溶液中的性能

Studies on ion exchange membrane performance in vanadium solution for all vanadium flow battery

考察了Nafion、日-160、日-80、FYM(日本产Nafion膜)和均相膜5种离子交换膜的两个关键性能(渗透性和面电阻)及其影响因素,对均相膜的化学稳定性进行了初步研究,并对两种膜进行了改性。实验发现:均相膜的钒扩散系数最小,但面电阻较大,化学稳定性不好;用二乙烯苯(DVB)对均相膜改性,综合性能较好;减小电场可降低钒离子扩散,提高钒溶液中氢离子浓度可减小面电阻。

In the paper, two key properties(permeability of vanadium ion and area resistance)of five different ion exchange membranes, that is Nafion, Japan-160, Japan-80, FYM produced in Japan and homogeneous membrane, and the effective factors were studied. The long term chemical stability of the homogeneous membrane was evaluated on the area resistance. Certain modification to FYM and homogeneous membrane was carried out. The results show that: homogeneous membrane has low permeability but high area resistance and poor chemical stability. Enhancing the intensity of electric field increased the permeability; increasing the concentration of in the solution decreased area resistance. Homogeneous membrane was crosslinked by DVB, whose comprehensive performances were improved.