Researchers from Stanford developed a new cathode material for rechargeable lithium-sulfur batteries - by wrapping sulfur particles in graphene sheets. This new cathode enables batteries with a significantly higher energy density than is currently possible. Such batteries can be used to power electric cars - and be much more efficient that today's batteries:

http://www.graphene-info.com/graphene-can-be-used-make-high-density-lithium-sulfur-car-batteries
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