According to a recent tweet from @evleaks, graphene batteries are on the horizon. It is said that working on the lithium ion alternative is Samsung, who supposedly expects to have at least one phone in 2020 or 2021 with a graphene battery.
as @evleaks he tweets: “Samsung expects to have at least one phone next year or 2021, which will have a graphene battery. Capable of a full load in less than half an hour, they still need to increase capacities and reduce costs. "
Graphene has some advantages over its typical lithium-ion battery. One of the advantages @evleaks it points to faster charging times, in this case what could be a full charge in less than half an hour. Other advantages include higher capacities, less weight and, of course, flexibility.
We could still be very far from a Samsung flagship with a graphene battery, but knowing that a lithium-ion replacement is working is exciting.