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The efficiency of a material for EC energy
storage can be described by its specific volumetric capacitance in a single electrode (Cvol) and
energy density against the volume of two EC
electrodes (Evol-electrode); the volumetric energy
density against the whole EC stack (Evol-stack)¡ª
including two electrodes, electrolyte, a separator
between two electrodes, and current collectors¡ª
was recently recommended to be a more reliable
parameter than the gravimetric one to evaluate
the realpotentialofaporouscarbon forECs(8¨C10).
Evol-stack relates to gravimetric capacitance of the
active carbon component in a single electrode
(Cwt-C), packing density of the carbon (r), volume fraction of the electrodes in the device stack
( felectrode), as well as the nominal voltage (U) of
the EC as follows (6).
Cvol = C£¨wt©\C £© *ÃܶÈ
Evol©\electrode =Cvol * U2/8
Evol©\stack = Evol©\electrode*  felectrode
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