Thanks for your comments. In terms of fast charging, graphene can actually charge in seconds, I just wanted to maintain a fair reception by using minutes to avoid over exaggeration. But, with Graphene supercapacitors, we could actually have phone batteries charged in seconds.
And for possible use of Graphene with other materials, it is actually in existence already and wonderful results have been generated with it. We have the Silicon-Graphene nanocomposite material used by a Researcher from the Northwestern University in lithium batteries to improve the charging rate and energy storage. There's Graphene-rubber composite too used for improving the electrical properties of the rubber.
As it is still quite new, researchers are still working on making it global
Thanks for your time here