Product Sector: Energy → Energy Storage → Electrical Energy → Supercapacitor
SkeletonC based polarizable electrodes are prepared from the mixture of ~90% (wt.) of carbide-derived porous carbon and ~10 % (wt.) PTFE binder. The carbon films are rolled stepwise into the electrodes with a desired thickness in the range of 50 - 100 µm. After drying, the raw electrode sheets are coated from one side with a thin aluminium layer using the plasma activated physical vapour deposition method.
Ultracapacitor schematic drawing
The ultracapacitors are made from asymmetrically coupled CDC electrodes. Particularly, the electrodes, attracting anions, are made from highly nanoporous SkeletonC and the electrodes, attracting cations, are made from SkeletonC having improved transport porosity.
Prior the use of the ultracapacitors they are kept at +60°C during 48 hours. Thereafter continuous cycling between 2.85 V and 1.4 V with the current I = 5 mA/F is carried out, prior performing the further evaluation. The slight pressure created during preconditioning is released through the filling valve.
The package of positive and negative electrodes is placed in prismatic aluminium can, sealed and dried prior impregnation with the electrolyte. The electrolyte is ~1.2 M triethylmethylammonium tetrafluoroborate in anhydrous acetonitrile (H2O <0.003 %). The Et3MeNBF4 salt is selected because of the use of highly nanoporous carbon materials, which according to the studies prefer the smaller Et3MeN+ cations, but not the Et4N+ ions commonly used in non-aqueous ultracapacitors.