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18 NOVEMBER 2011 VOL 334 SCIENCE
True Performance Metrics in Electrochemical Energy Storage
Y. Gogotsi  and P. Simon


Many nanomaterials, such as nanotubes or graphene, have a low packing density (<0.5 g/cm3), which leads to empty space in the electrode that will be fl ooded by electrolyte, thereby increasing the weight of the device without adding capacitance. An extreme case would be the use of a carbon aerogel with 90% porosity. The volumetric energy of such an electrode will be 20% that of a carbon electrode with just 50% porosity.

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