I know the video to which you refer. Lithium 6 would make a great storage medium for hydrogen, but that stuff will cost you an arm and a leg. Converting Lithium 7 to Lithium 6 would take an enormous amount of energy, so much for so long that it would be cheaper just to buy it.
I don't want to...
Wouldn't this reaction further decay the Li-6 by the very nature of the constant bombardment of electrons?
Just out of curiosity, how much time is a long time? Say... for one gram of Li-7?