How is the total active material mass determined in a symmetric supercapacitor with two electrodes of the same material but different active material masses?
I use a very basic method: cut and weigh 3 electrodes of each type, cut and weigh 3 bare substrates (current collector), subtract the mean weight of the substrate from the mean weight of the electrode, then multiply that weight by the % of active material in your dry formula. For example, if 95% of the dry part of my slurry is the active material, multiply the weight of electrode (after subtracting substrate weight) by 0.95.
Be advised: this is only reliable if the thickness of your electrodes is very, very repeatable. Changes to the thickness of your electrodes will alter active material weight much more than changes to your formula.
Gravimetric method: This method involves measuring the mass of the active material before and after the supercapacitor is assembled. The difference in mass is equal to the mass of the active material in the su percapacitor. This method is relatively simple and straightforward, but it can be affected by errors in the measurement of the mass, and it may not account for any active material that is lost during the assembly process.
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