The commercially available anion exchange membrane was crosslinked by accelerated electron radiation, and the performance of the all-vanadium redox flow battery using the crosslinked membrane was measured. The current efficiency of the cell using the crosslinked membrane was higher than that of the cell using the non-crosslinked membrane. The allvanadium redox flow battery which used the crosslinked membrane (at a dose of 5 Mrad) had better performance with a current efficiency of 93.5%, voltage efficiency of 87.7% and overall energy efficiency of 82%. The overall energy efficiency over of 80% which was achieved for the all-vanadium redox flow battery makes it one of the most promising alternative energy storage systems currently under development. The performance properties of the cell using the crosslinked membrane (at a dose of 5 Mrad) did not change over several cycles showing good chemical stability of the membrane.