California Institute of Technology

Erik J Brandon

William Clark West

Marshall C Smart

Ratnakumar V Bugga

Systems and methods in accordance with embodiments of the invention implement high-temperature tolerant supercapacitors. In one embodiment, a high-temperature tolerant super capacitor includes a first electrode that is thermally stable between at least approximately 80&#xb0; C. and approximately 300&#xb0; C.; a second electrode that is thermally stable between at least approximately 80&#xb0; C. and approximately 300&#xb0; C.; an ionically conductive separator that is thermally stable between at least approximately 80&#xb0; C. and 300&#xb0; C.; an electrolyte that is thermally stable between approximately at least 80&#xb0; C. and approximately 300&#xb0; C.; where the first electrode and second electrode are separated by the separator such that the first electrode and second electrode are not in physical contact; and where each of the first electrode and second electrode is at least partially immersed in the electrolyte solution.

Systems and methods for implementing high-temperature tolerant supercapacitors

Double-layer capacitors capable of operating at extremely low temperatures (e.g., as low as &#x2212;80&#xb0; C.) are disclosed. Electrolyte solutions combining a base solvent (e.g., acetonitrile) and a cosolvent are employed to lower the melting point of the base electrolyte. Example cosolvents include methyl formate, ethyl acetate, methyl acetate, propionitrile, butyronitrile, and 1,3-dioxolane. A quaternary ammonium salt including at least one of triethylmethylammonium tetrafluoroborate (TEMATFB) and spiro-(1,1')-bipyrrolidium tetrafluoroborate (SBPBF), is used in an optimized concentration (e.g., 0.10 M to 0.75 M), dissolved into the electrolyte solution. Conventional device form factors and structural elements (e.g., porous carbon electrodes and a polyethylene separator) may be employed.

Low temperature double-layer capacitors using asymmetric and spiro-type quaternary ammonium salts

Double-layer capacitors capable of operating at extremely low temperatures (e.g., as low as &#x2212;75&#xb0; C.) are disclosed. Electrolyte solutions combining a base solvent (e.g., acetonitrile) and a cosolvent are employed to lower the melting point of the base electrolyte. Example cosolvents include methyl formate, ethyl acetate, methyl acetate, propionitrile, butyronitrile, and 1,3-dioxolane. An optimized concentration (e.g., 0.10 M to 0.75 M) of salt, such as tetraethylammonium tetrafluoroborate, is dissolved into the electrolyte solution. In some cases (e.g., 1,3-dioxolane cosolvent) additives, such as 2% by volume triethylamine, may be included in the solvent mixture to prevent polymerization of the solution. Conventional device form factors and structural elements (e.g., porous carbon electrodes and a polyethylene separator) may be employed.

Low temperature double-layer capacitors

The present invention relates to a system and method of organic thin-film transistors (OTFTs). More specifically, the present invention relates to employing a flexible, conductive particle-polymer composite material for ohmic contacts (i.e. drain and source).

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Pasadena, CA, United States of America

Erik J Brandon