By Charles Q. Choi -
By combining sheets of graphene with a traditional battery material, scientists have created hybrid supercapacitors that can store as much charge as lead acid batteries but can be recharged in seconds compared with hours for conventional batteries.
Supercapacitors now play an important role in hybrid and electric vehicles, consumer electronics, and military and space applications. However, they are often limited in terms of how much energy they can store.
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Ref: Engineering three-dimensional hybrid supercapacitors and microsupercapacitors for high-performance integrated energy storage. PNAS March 2015.