High temperature supercapacitor

A supercapacitor device, comprising:

• a housing;
• and
• at least one supercapacitor cell disposed in the housing, the supercapacitor cell comprising:
• two working electrode layers separated by an electrode separator wherein each working electrode layer is electrically connected to a current collector;
• and
• an electrolyte disposed within the area occupied by the working electrode layers and the electrode separator, the electrolyte comprising a continuous phase of an inert ionic liquid, wherein a cationic component of the inert ionic liquid has sufficiently large alkyl group substituents that the probability of electron tunneling is diminished.

A supercapacitor device, comprising:

• a housing;
• and
• at least one supercapacitor cell disposed in the housing, the supercapacitor cell comprising:
• two working electrode layers separated by an electrode separator wherein each working electrode layer is electrically connected to a current collector;
• and
• an electrolyte disposed within the area occupied by the working electrode layers and the electrode separator, the electrolyte comprising a continuous phase of an inert ionic liquid, wherein the continuous phase of inert ionic liquid is comprised of at least one substituted central cation.