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If the graphene battery's main claim to fame is higher instantaneous power, that is not really what the electric vehicle needs to progress. Range versus cost versus cycle life is the big issue. And these graphene batteries cost a fortune. And what is the cycle life if you are always charging them at 12C? A large EV battery needs at least 2,000 cycles to 80% to make a 300,000 mile life so as to fulfill it's promise of being cheaper than an ICE car.
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We already have batteries that are so large in capacity that a 2C discharge is 170hp. We don't need 90C. And as the capacity of EV batteries goes to 60 kWh as a norm, the charge rate will become more and more limited by the cable and connector (And Infrastructure if you think you are going to have a station charging 10 EV's at 250kW all the time) than the battery. Higher rates than 150kW at 400v that Tesla is approaching will require a split pack design that can run at 400v and charge at 800v to keep the current down.
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