you really need to read this article out of our selected:
http://cleantechnica.com/2014/12/29/graphene-kill-lithium-ion-batteries/
the title is misleading!!
The batteries still use lithium, but use graphene as a substrate to house a sodium semi-structure to make the overall battery capacity, life and charge rate more efficient.
Graphene will definitely be the next phase of batteries, however lithium as the most widely used cathode won't change unless they find a cathode material with a higher eV/unit volume (something that isn't as important for the anode).