51 results about "Electrochemical double layer capacitor" patented technology

Disclosed are supercapacitors having organosilicon electrolytes, high surface area/porous electrodes, and optionally organosilicon separators. Electrodes are formed from high surface area material (such as porous carbon nanotubes or carbon nanofibers), which has been impregnated with the electrolyte. These type devices appear particularly suitable for use in electric and hybrid electric vehicles.

An electrical storage device includes high surface area fibers (e.g., shaped fibers and/or microfibers) coated with carbon (graphite, expanded graphite, activated carbon, carbon black, carbon nanofibers, CNT, or graphite coated CNT), electrolyte, and/or electrode active material (e.g., lead oxide) in electrodes. The electrodes are used to form electrical storage devices such as electrochemical batteries, electrochemical double layer capacitors, and asymmetrical capacitors.

A method of forming nanoporous carbon material includes the steps of providing a natural carbonaceous material, the carbonaceous material having pores being filled with at least one other material, and treating the carbonaceous material with a strong acid or a strong base, wherein the other material is removed from the pores to form a nanoporous carbon material having open pores available for organic electrolyte. The nanoporous carbon material can be used to form composite electrodes by impregnating the open pores with an organic electrolyte. Such electrodes can be used to form electrochemical double layer capacitors (EDLC), such as by disposing an electrically insulating layer comprising a plurality of nano-size dielectric particles together with a binder directly onto a surface of at least one of anode and the cathode, and interposing the electrically insulating layer between the anode and the cathode. EDLCs formed using the invention are low cost and provide large specific energy stored and low inner resistance resulting in high power output.

An oblong electrochemical double-layer capacitor is disclosed having a modified jelly roll design and having a plurality of fingers extending from each electrode in substantially the same direction. A packaged electrochemical double-layer capacitor is also disclosed comprising the oblong electrochemical double-layer capacitor having a modified jelly roll design. A method for manufacturing an oblong electrochemical double-layer capacitor having a modified jelly roll design is also disclosed.

The invention generally encompasses phosphonium ionic liquids, salts, compositions and their use in many applications, including but not limited to: as electrolytes in electronic devices such as memory devices including static, permanent and dynamic random access memory, as electrolytes in energy storage devices such as batteries, electrochemical double layer capacitors (EDLCs) or supercapacitors or ultracapacitors, electrolytic capacitors, as electrolytes in dye-sensitized solar cells (DSSCs), as electrolytes in fuel cells, as a heat transfer medium, among other applications. In particular, the invention generally relates to phosphonium ionic liquids, salts, compositions, wherein the compositions exhibit superior combination of thermodynamic stability, low volatility, wide liquidus range, ionic conductivity, and electrochemical stability. The invention further encompasses methods of making such phosphonium ionic liquids, salts, compositions, operational devices and systems comprising the same.

A method of making an electrode structure, the electrode structure and a double layer capacitor including the electrode structure, the method comprising the steps of: forming a plurality of electrodes, each having a current collector plate, a primary coating formed on each side of the collector plate, the primary coating including conducting carbon powder and a binder, and a secondary coating formed on each primary coating, the secondary coating including activated carbon powder, a solvent and a binder; positioning a respective separator between each electrodes while stacking the electrodes such that the respective separator is juxtaposed against respective secondary coatings of adjacent electrodes that electrically insulates the adjacent electrodes, whereby forming an electrode stack; and rolling the electrode stack into a cylindrical electrode structure.

An electrochemical double layer capacitor (EDLC) is provided. The EDLC can include first and second multi-layered polarizable electrodes arranged within a casing. Each multi-layered polarizable electrode can include a nanoporous carbon layer and a metal current collector layer including a metal substrate having a first surface and a second surface. The first surface can be covered by the nanoporous carbon layer. An organic electrolyte can be impregnated within the nanoporous carbon layer. The first surface of the metal substrate can include a plurality of conductive carbon particles each (i) being locally and individually fused into the first surface of the metal substrate by spot melting an area on the first surface of the metal substrate, (ii) projecting out of the first surface, and (iii) surrounded by a flowed surface of the metal substrate. The plurality of conductive carbon particles are at least one of graphite, carbon black, and acetylene black particles

Electrode material typically is made from treated carbons. The number of functional groups residing on the treated carbon is reduced before the treated carbon is integrated into an electrochemical double layer capacitor. In one implementation, the number of functional groups on a given treated carbon is reduced by over 80%.

The present invention provides, in at least one embodiment, a fault indicator powered by a capacitive power source. The capacitive power source can be a charged capacitor which can be charged by an electrostatic field and an electromagnetic field around a power line being monitored. The charged capacitor can be an electrochemical double-layer capacitor, a supercapacitor, or an ultracapacitor. These capacitors provide superior energy storage compared to conventional battery power sources.

The invention generally encompasses phosphonium ionic liquids, salts, compositions and their use in many applications, including but not limited to: as electrolytes in electronic devices such as memory devices including static, permanent and dynamic random access memory, as electrolytes in energy storage devices such as batteries, electrochemical double layer capacitors (EDLCs) or supercapacitors or ultracapacitors, electrolytic capacitors, as electrolytes in dye-sensitized solar cells (DSSCs), as electrolytes in fuel cells, as a heat transfer medium, among other applications. In particular, the invention generally relates to phosphonium ionic liquids, salts, compositions, wherein the compositions exhibit superior combination of thermodynamic stability, low volatility, wide liquidus range, ionic conductivity, and electrochemical stability. The invention further encompasses methods of making such phosphonium ionic liquids, salts, compositions, operational devices and systems comprising the same.

A method of making an electrode structure, and a double layer capacitor including the electrode structure, the method includes the steps of: applying a first slurry including conducting carbon powder and a binder to a current collector plate; curing the applied first slurry to form a primary coating; applying a second slurry that includes activated carbon powder, a solvent and a binder to the primary coating; and curing the applied second slurry to form a secondary coating, thereby forming a first electrode. In variations, additional primary and secondary coatings may be formed on both sides of the collector plate.

An active material of the present invention has fine pores formed in the interlayer of a carbon material capable of exhibiting electrochemical double layer capacitance. The fine pores are formed by forming an oxidized graphite structure combined with oxygen in the interlayer of a part or whole of the carbon material containing soft carbon and then removing a part or whole of oxygen in the interlayer. A method for producing an energy storage active material for use in an electrochemical double layer capacitor comprises pre-treating a carbon material through heat treatment and oxidizing the pre-treated carbon material using an oxidant. The method further comprises reducing the oxidized carbon material through heat treatment. The interlayer distances of an active material for respective steps, measured by a powder X-ray diffraction method, are 0.33˜0.36 nm in the pre-treatment step, 0.5˜2.1 nm in the oxidation step, and 0.34˜0.5 nm in the reduction step.

The invention generally encompasses phosphonium ionic liquids, salts, compositions and their use in many applications, including but not limited to: as electrolytes in electronic devices such as memory devices including static, permanent and dynamic random access memory, as electrolytes in energy storage devices such as batteries, electrochemical double layer capacitors (EDLCs) or supercapacitors or ultracapacitors, electrolytic capacitors, as electrolytes in dye-sensitized solar cells (DSSCs), as electrolytes in fuel cells, as a heat transfer medium, among other applications. In particular, the invention generally relates to phosphonium ionic liquids, salts, compositions, wherein the compositions exhibit superior combination of thermodynamic stability, low volatility, wide liquidus range, ionic conductivity, and electrochemical stability. The invention further encompasses methods of making such phosphonium ionic liquids, salts, compositions, operational devices and systems comprising the same.

The invention relates to elecrical engineering and can be used for producing electrochemical double-layer capacitors having high specific energy and power characteristics and which can store and give off energy at high speed. The essence of said invention lies in the fact that the active mass of a negative polarised electrode (2) is an organic electroconducting polymer or composite which is based on a carbon or polymer material. A separator (3) is provide with pores which enables additional oxygen molecules to penetrate. The negative polarized electrode (2) is made of a polyaniline composite and an activated carbon material or of an activated carbon material composite and polypyrrole. Aqueous solutions of non-organic acids or mixture or salts thereof or thixotropic mixtures of acids and salts or solid proton conductive compositions are used as electrolytes.

The treatment process of active carbon for super capacitor features the undervoltage deposition of one of the metal ion of Al3+, Li+, Zn2+, Cu2+, Ti+ and Pb2+ on the surface of active carbon to form quasi-Faraday capacitor for electrochemical double layer capacitor. Any one kind of the solution of the said ions may be added into super capaictor KOH electrolyte solution or any one kind of the solution of the said ions may be used in modifying active carbon powder to deposit the ion in the pores. The super capacitor of the present invention is matched with accumulator or other battery to constitute composite battery with high power, great capacitance and fast charging. The composite battery may be used widely in astronautic, millitary, traffic, electric power, communication and other fields.

The present invention relates to the field of capacitors, and in particular electrochemical double layer capacitors which include separators comprising a porous layer of polymeric nanofibers and an antioxidant.

Synthesis of molecules and salts is disclosed having low average symmetry and their use in many applications, including but not limited to: as electrolytes in electronic devices such as memory devices including static, permanent and dynamic random access memory, as electrolytes in energy storage devices such as batteries, electrochemical double layer capacitors (EDLCs) or supercapacitors or ultracapacitors, electrolytic capacitors, as electrolytes in dye-sensitized solar cells (DSSCs), as electrolytes in fuel cells, as a heat transfer medium, high temperature reaction and/or extraction media, among other applications. In particular, synthesis methods and processes to form molecules and salts having low average symmetry using mixed Grignard reagents are disclosed.

The invention provides a method of producing activated carbon by reacting waste coffee grounds with an activating agent in an environment including at least one inert gas. Also disclosed is a nanoporous carbon electrode for use in a supercapacitor, and an Electrochemical Double-Layer Capacitor (EDLC). The constructed supercapacitor, in 1 M H2SO4 aqueous electrolyte, exhibited energy densities up to 20 Wh/kg, and excellent stability at high charge-discharge rates. In a two electrode cell the electrode was observed to have a specific capacitance as high as 368 F/g, rectangular cyclic voltammetry curves and stable performance over 10,000 cycles. Also disclosed is an EDLC using an organic electrolyte, the influence of activation agents and ratios, and activated carbon prepared from sugar cane bagasse.

The invention generally encompasses phosphonium ionic liquids, salts, compositions and their use in many applications, including but not limited to: as electrolytes in electronic devices such as memory devices including static, permanent and dynamic random access memory, as electrolytes in energy storage devices such as batteries, electrochemical double layer capacitors (EDLCs) or supercapacitors or ultracapacitors, electrolytic capacitors, as electrolytes in dye-sensitized solar cells (DSSCs), as electrolytes in fuel cells,, as a heat transfer medium,, among other applications. In particular, the invention generally relates to phosphonium ionic liquids, salts, compositions, wherein the compositions exhibit superior combination of thermodynamic stability, low volatility, wide liquidus range, ionic conductivity, and electrochemical stability. The invention further encompasses methods of making such phosphonium ionic liquids, salts, compositions, operational devices and systems comprising the same.