Conventional batteries take so long to charge that they cannot efficiently store braking energy. But now graphene supercapacitors that store almost as much but charge in just 16 seconds could do the job instead.
Now Santhakumar Kannappan at the Gwangju Institute of Science and Technology in Korea and a few pals say they have a solution based on the wonder material of the moment–graphene. These guys have built high-performance supercapacitors out of graphene that store almost as much energy as a lithium-ion battery, can charge and discharge in seconds and maintain all this over many tens of thousands of charging cycles.
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