Supercapacitors Cornell Dubilier (CDE) Supercapacitors are also known as ultracapacitors, double-layer capacitors, electro-chemical double-layer (EDLC), and pseudocapacitors. The storage capacity of supercapacitors is large, and these devices can be networked together for higher voltage modules. CDE Supercapacitors can also be used to extend the life of, or even replace, a battery.