|The principle of supercapacitors is based on the creation of an electrochemical double layer by accumulation of electrical charges at the interface between an ionic solution (electrolyte) and an electronic conductive material (electrode). A main difference with batteries is that there is no faradaic oxidation or reduction.
The interface between charges acts as a dielectric. The electrode contains activated carbon of very large specific area. As a result of both large surface area and small dielectric thickness supercapacitors can achieve extremely high capacitance values compared to traditional capacitors. Cell voltage is limited by the electrolyte solution to a few Volts.
Processes used in the manufacturing of single cells include
- production of electrodes
- winding of electrode and separator films,
- cell assembly using ultra-low contact resistance design - under controlled environment
- electrolyte filling