I know about the graphene battery, but as I outlined earlier a Mercedes Engineer told that this is only a prototype and probably 20 years away to become a commercial reality. They only big company I am aware of that will introduce graphene batteries in the short term is GAC. Just take a look at all battery factories beeing setup in Europe. All require lithium and graphite - no graphene, thats it.
Graphite plays, like Ecograph, are running hot. Isn't that funny? Originally I invested into MRL/First Graphite because of the graphite where they told us to be operational in 2016. If they had their graphite mines running and were selling graphite until their graphene business picks up their valuation would look much much better.... but so here we are, haveing a product where the demand is not there yet, but probably it will be by 2024/2025.