Abstract: Embodiments of the disclosure provide an electrode assembly including: a jelly roll electrode having a plurality of electrode sheets, the plurality of electrode sheets including an anode sheet, a cathode sheet, and a separator separating the anode sheet from the cathode sheet, an electrolyte disposed between the anode sheet and the cathode sheet of the jelly roll electrode, and a tab projecting from an axial end of the plurality of electrode sheets, the tab including a subsection of the plurality of electrode sheets contacting each other at an axial end of the jelly roll electrode; and a first conductive tab coupled to the tab of the electrode assembly, wherein the first conductive tab is configured to electrically couple the electrode assembly to a battery terminal.

Abstract: The disclosure describes an improved electrolytic capacitor, more specifically, a method of making an electrolytic capacitor with a graphene-based energy storage layer and dielectric. The electrode with layered graphene energy storage and dielectric layers may be used in a variety of electrolytic capacitor configurations.

Abstract: The disclosure describes an improved electrolytic capacitor, more specifically, an electrolytic capacitor with a graphene-based energy storage layer and dielectric, and a method of making the improved electrolytic capacitor. The electrode with layered graphene energy storage and dielectric layers may be used in a variety of electrolytic capacitor configurations.

Abstract: The disclosure describes an improved electrode with high voltage standoff characteristics and improved graphene-based materials and methods of making them for use therein. A graphene-based thin film material is described that may be applied or transferred to a current collector to create the improved electrode. The thin film comprises high aspect ratio graphene platelets applied to the surface of a current collector or other substrate in a known ratio to a film binder material. The film is produced with a desired layer thickness and graphene-to-binder ratio to produce a desired voltage standoff for the electrode. The film may include additional materials to achieve the desired dielectric and mechanical characteristics for the application, such as ferroelectric ceramic nanorods with a high aspect ratio and high dielectric constant and/or graphene sheets.

Abstract: The invention provides operational monitoring for electrochemical capacitors and, more specifically, the monitoring of operational performance characteristics of electrochemical capacitors using electrochemical impedance measurement in an application system in the field. The apparatus and methods of the present invention monitor the operational characteristics of a plurality of electrochemical capacitors in an application system with the goal of providing state of health information to the application system or through another monitoring or alert system. By generating an input monitoring signal to query each cell in the pack and calculating the impedance measurement signal from the resulting output signal, the real-time impedance measurements can be compared against a stored electrochemical impedance model to provide state of health information. Real-time monitoring data based on the state of health information can then be output to the application system or through another monitoring or alert system.

Abstract: The disclosure describes an improved electrolytic capacitor, more specifically, an electrolytic capacitor with a graphene-based energy storage layer and dielectric, and a method of making the improved electrolytic capacitor. The electrode with layered graphene energy storage and dielectric layers may be used in a variety of electrolytic capacitor configurations.