Double-layer capacitors separator

At this interface, charges are separated and form the double-layer capacitor, but because electrons can transfer freely between the two phases, the interfacial charge <2i is fixed at only one value by the equilibrium potential Eeq. 

Tsukada T, Midorikawa M (2004) JP 2004014592 A2 20040115 Separator for double layer capacitor... 

In a simple case, the electrochemical reaction at the electrode-electrolyte interface of one of the electrodes of the battery can be represented by the so-called Randles circuit (Figure 8.19), which is composed of [129] a double layer capacitor formed by the charge separation at the electrodeelectrolyte interface, in parallel to a polarization resistor and the Warburg impedance connected in series with a resistor, which represents the resistance of the electrolyte. 

Typically, a supercapacitor is composed of two electrodes dipped in an electrolyte solution with a suitable separator. It is generally accepted that the energy storage mechanism of supercapacitors can be classified into electrical double layer capacitors (EDLCs) and pseudocapacitors (Fig. 6.1A) (Jost et al., 2014). In EDLCs, the charge storage is based on a reversible ion adsorption from an electrolyte onto electrodes with high specific surface areas to form a double layer structure. The capacitance comes from the pure electrostatic... 

Tonurist, K., T. Thomberg, A. Janes, 1. Kink, and E. Lust. 2012. Specific performance of electrical double layer capacitors based on different separator materials in room temperature ionic liquid. Electrochemistry Communications 22 77-80. 

Stepniak, L, and A. Ciszewski. 2010. Grafting effect on the wetting and electrochemical performance of carbon cloth electrode and polypropylene separator in electric double layer capacitor. Journal of Power Sources 195 5130-5137. 

Wada H, Nohara S, Furukawa N, Inoue H, Sugoh N, Iwasaki H, Morita M, Iwakura C (2004) Electrochemical characteristics of electric double layer capacitor using sulfonated polypropylene separator impregnated with polymer hydrogel electrolyte. Electrochim Acta 49 4871... 

NKK has approximately 15 types of ceUulose-based separators for supercapacitors and batteries. Cellulose-based separators have higher thermal stability than their polyolefin counterparts. An example version of an NKK cellulose-based film (used as a battery separator or as a separator for EDLCs (electric double layer capacitors)) has features such as 35—45 pm thickness, 14.5 basis weight (gsm), 66% porosity (mercury poros-imetry), and ionic resistance of 0.58 (ohms-cm ) (Fig. 11.15). " ... 

The introduction of carbonaceous electrode materials for the electrochemically driven actuators intersected two classes of electrochemical devices that were considered as being separate beforehand - the electromechanical actuators and the electric double-layer capacitors (also known as supercapacitors). Although the... 

---