
357Vanadium Flow Batteries
9.3.1.3 Anion Exchange Membranes
Anion exchange membranes attract quite a lot of attention due to their repel-
lent effect to positive vanadium ions, and appears to be benecial to mini-
mise the vanadium ion cross-mixing [31,32]. Jian etal. prepared quaternised
poly(phthalazinone ether ketone/sulphone) membranes and investigated the
effect of the amination agent on these polymers [33,34]. The positive-charged
quaternised groups in membranes can effectively repel vanadium ions and,
thus, show much better ion selectivity. The VFB performance of these mem-
branes is comparable to Naon 117 and their permeability is arou ...