Maxwell Technologies, Inc.

Sony Corporation

Sony Electronics Inc

Ucap Power, Inc.

Priya Bendale

Jeffrey Nelson

Doug Schafer

Porter H Mitchell

Xiaomei Xi

Robert W Crawford

John M Dispennette

Chenniah Nanjundiah

John Michael Miller

Thomas J Dougherty

Jeffrey G Nelson

Manuel R Malay

Earl Chaney

Ilya Kaminsky

Robert Shaw Lynds

Mikael Setterberg

Jeremy Michael Cowperthwaite

Frederic Spiess

Ha Q Hung

Jeffrey Bouchard

An electric double-layer ultracapacitor configured to maintain desired operation at an operating voltage of three volts, where the capacitor includes a housing component, a first and a second current collector, a positive and a negative electrode electrically coupled to one of the first and second current collectors, and a separator positioned between the positive and the negative electrode. At least one of the positive electrode and the negative electrode can include a treated carbon material, where the treated carbon material includes a reduction in a number of hydrogen-containing functional groups, nitrogen-containing functional groups and/or oxygen-containing functional groups.

Carbon surface modification for three-volt ultracapacitor

An electric double-layer ultracapacitor configured to maintain desired operation at an operating voltage of three volts, where the capacitor includes a housing component, a first and a second current collector, a positive and a negative electrode electrically coupled to one of the first and second current collectors, a separator positioned between the positive and the negative electrode, and an electrolyte in ionic contact with the electrodes and the separator. At least one of the positive electrode and the negative electrode can be made of a carbon based layer having a mesoporosity and/or a microporosity optimized for ionic mobility therewithin.

Electrode porosity for three-volt ultracapacitor

An energy storage device having improved energy density performance may include an electrolyte having a salt concentration of about 0.6 moles/L (M) to about 0.95M. A final energy storage device product having a total mass of electrolyte that is at least 100% of a saturation quantity of electrolyte sufficient to fully saturate one or more electrode(s) and separator(s) of the device, and below a threshold quantity above the saturation quantity.

Energy storage device with enhanced energy density

An electric double-layer ultracapacitor configured to maintain desired operation at an operating voltage of three volts, where the capacitor includes a housing component, a first and a second current collector, a positive and a negative electrode electrically coupled to one of the first and second current collectors, and a separator positioned between the positive and the negative electrode. The capacitor may also include a protective coating disposed on an inner surface of the housing for the ultracapacitor.

Coated housing for ultracapacitor

An electric double-layer ultracapacitor configured to maintain desired operation at an operating voltage of three volts, where the capacitor includes a housing component, a first and a second current collector, a positive and a negative electrode electrically coupled to one of the first and second current collectors, and a separator positioned between the positive and the negative electrode. The capacitor may also include an electrolyte in ionic contact with the electrodes and the separator, the electrolyte having acetonitrile and a quaternary ammonium salt with a molarity of less than one.

Electrolyte for three-volt ultracapacitor

This disclosure provides systems, methods and apparatus for a combined battery/capacitor energy storage device. The device includes a first device terminal, a second device terminal, a battery connected between the first terminal and the second terminal, and a capacitor connected in parallel with the battery. In one aspect, a rectifier is connected between the first terminal and the capacitor, the rectifier configured to allow substantially unidirectional current flow from the first terminal to the capacitor. In another aspect, a switch is between the capacitor and the first terminal. In another aspect, a current limiter extends between the first terminal and the capacitor.

Ultracapacitor and battery combination with electronic management system

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.

Electrochemical double layer capacitor having carbon powder electrodes

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.

A method of making a double layer capacitor, in accordance with one embodiment, includes coupling a top collector disk to a proximal end of a double layer capacitor electrode assembly; electrically coupling a bottom collector disk to a distal end; heating a can; inserting the double layer capacitor electrode assembly into the can; cooling the can, wherein a peripheral edge of the bottom collector disk is coupled to the can as the diameter of the can is decreased; forming a bead around an exterior of the can; heating a lid; placing a concave structure of the lid in juxtaposition with a convex structure on the top collector disk; cooling the lid, wherein the concave structure is coupled to the convex structure as the diameter of the can is decreased; creating a seal between the lid and the can; and placing an electrolyte solution into the electrode assembly.

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San Diego, CA, United States of America

Priya Bendale