In literature two formulae are generally used for evaluating Gravimmetric power density (Pd)
1. Pd (W/Kg) = Energy density (Whr/kg) x 3600/ discharge time (s) and
2. Pd (W/Kg) = [106 x V2]/[4 x ESR (Ohm) x mass (mg)]
But it has been found that each equation gives different result for any known value of current density. What may be the reason for it? Which equation is to be used for determining the power density of two electrode supercapacitor?
See J. POWER Sources 473, 2020, 228467. ( supporting information of Modular theory for DC biased EIS response for Supercapacitors).
Dear M. K. Dey
In my personal opinion, there is no point in comparing the Power density values from GCD and EIS.
The power density value from the first equation depends on the energy density calculated from GCD. (It seems more reliable)
Whereas, power density calculated from the second formula depends upon the characteristic values from the EIS.
For further details of the calculations, you can see this article
Article Integrated hybrid of graphitic carbon-encapsulated CuxO on m...
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