Core-shell nanoparticles in electronic capacitor applications
Provided is an electrostatic capacitor-like electronic battery comprising a high dielectric-strength matrix separating a first electrode from a second electrode and, dispersed in said high-dielectric strength matrix, a plurality of core-shell nanoparticles, each of said core- shell nanoparticles having a conductive core and an insulating shell.
Publication number: EP2507805A2 | Search similar patents
Asymmetric electrochemical capacitor and method of making
An asymmetric electrochemical capacitor has at least a larger capacitance electrode and a smaller capacitance electrode, with an electrolyte therebetween. The larger capacitance electrode has a larger absolute capacitance than the smaller capacitance electrode. The capacitor thus has an overall capacitance which is approximately the absolute capacitance of the smaller capacitance electrode. The electrodes may be made of different materials, with the larger capacitance electrode made of the material having a larger specific capacitance. The larger capacitance electrode may thus be the same physical size as or smaller than the smaller capacitance electrode.
Publication number: US6222723B1 | Search similar patents
Supercapacitor based on mno2 and tio2 composites
A capacitor includes first and second electrodes and a porous dielectric between the first and second electrodes and an MgNO3 based aqueous electrolyte. At least one of the electrodes comprises a composite of MnO2 and TiO2 nanoparticles or a composite of ?-MnO2 and TiO2 nanoparticles or a composite of ?-MnO2, TiO2, and carbon nanoparticles.
Publication number: WO2011078901A1 | Search similar patents
Electrical energy storage device with damping function
An electrical energy storage device with damping function is a capacitor-cell battery formed of a plurality of capacitor cells connected in either series or parallel. Each of the capacitor cells includes a supercapacitor and a pseudocapacitor. The supercapacitor is a non-polarized capacitor internally having a separator, and the pseudocapacitor is a polarized electrochemical capacitor. The supercapacitor and the pseudocapacitor are electrically connected in parallel. The supercapacitor has a capacity close to or equal to that of the pseudocapacitor. When charging the capacitor-cell battery, the supercapacitor in every capacitor cell produces a polarization effect, so that electrical energy is charged thereinto as a result of voltage. And, due to a potential balance between the supercapacitor and the pseudocapacitor, the electrical energy charged into the supercapacitor is rapidly transformed into electric current that flows into and is stored in the pseudocapacitor.
Publication number: US9461483B1 | Search similar patents
Fabrication of electrochemical capacitors based on inkjet printing
An electrochemical capacitor includes a first electrode including a first flexible substrate, a second electrode including a second flexible substrate, and an electrolyte. The first electrode includes a first layer of single-walled carbon nanotubes inkjetted on the first flexible substrate and a layer of first nanowires disposed on the first layer of single-walled carbon nanotubes. The second electrode includes a second layer of single-walled carbon nanotubes inkjetted on the second flexible substrate and a layer of second nanowires disposed on the second layer of single-walled carbon nanotubes. The electrolyte is sandwiched between the layer of first nanowires and the layer of second nanowires to form the electrochemical capacitor. A flexible energy storage device includes a first flexible substrate, a second flexible substrate, and one or more electrochemical capacitors formed between the first flexible substrate and the second flexible substrate. The flexible energy storage device can be wearable.
Publication number: US2011304955A1 | Search similar patents
Apparatus and associated methods
An electrode, the electrode including a conducting layer configured to act, in use, as a charge collector to provide an electrical path for generated and/or stored charge through the conducting layer; a barrier layer, the barrier layer configured to cover a portion of a surface of said conducting layer such that, when the electrode is in contact with an electrolyte, the electrolyte is prevented from substantially contacting and corroding the conducting layer at the covered portion; and an active electrode element configured for use in generation and/or storing charge, the active electrode element positioned in a non-covered portion in electrical contact with the conducting layer to prevent the electrolyte from substantially contacting and corroding the conducting layer in the non-covered portion and to also be exposed to said electrolyte to allow for the generation and/or storage of charge and provide the generated/stored charge to the conducting layer.
Publication number: US2013309527A1 | Search similar patents
Compounds having a redox group, use thereof as an electrolyte additive, electrolyte composition, and electrochemical systems containing same
The invention relates to compounds comprising a redox group, to the use thereof as an additive to an electrolyte composition, to an electrolyte composition including such an additive, and to electrochemical systems including such an electrolyte composition, in particular lithium or sodium batteries and supercapacitors having a double electric layer.
Publication number: WO2012153067A1 | Search similar patents
Fibril composite electrode for electrochemical capacitors
Composite electrodes comprising carbon nanofibers (fibrils) and an electrochemically active material are provided for use in electrochemical capacitors. The fibril composite electrodes exhibit high conductivity, improved efficiency of active materials, high stability, easy processing, and increase the performance of the capacitor. A method for producing the composite electrodes for use in electrochemical capacitors is also provided.
Publication number: EP1118090A1 | Search similar patents
High energy density hybrid battery/supercapacitor system
A rechargeable hybrid battery/supercapacitor electrical storage system capable of providing high energy and high power densities comprises a negative intercalation electrode (17) and a positive capacitor electrode (13) comprising an anion-adsorbing component and a cation-intercalating material combined with a separator (15) and electrically-conductive current collector elements (11, 19) to form a unitary cell structure (10). An electrolyte solution of a dissociable salt absorbed into the porous structure of the separator (15) provides complementary ion species which, supplemented by cations supplied from the positive electrode intercalation material in order to increase the energy density capability of the system, respectively reversibly intercalate into the negative electrode (17) and capacitively adsorb at the surface of the positive electrode (13) upon the application of charging current. The high density stored electrical energy may be rapidly recovered at high power over extended periods upon demand of a utilizing device and may be equally rapidly restored to stable high energy capacity through numerous charging cycles.
Publication number: US6517972B1 | Search similar patents
Electrokinetic pump having capacitive electrodes
An electrokinetic pump achieves high and low flow rates without producing significant gaseous byproducts and without significant evolution of the pump fluid. A first feature of the pump is that the electrodes in the pump are capacitive with a capacitance of at least 104 Farads/cm2. A second feature of the pump is that it is configured to maximize the potential across the porous dielectric material. The pump can have either or both features.
Publication number: US2004074768A1 | Search similar patents
Hybrid electrochemical capacitor
Hybrid electrochemical capacitors, electronic devices using such capacitors, and associated methods are disclosed. In an example, a hybrid electrochemical capacitor can include a first electrode made from Mg, Na, Zn, Al, Sn, or Li, a second electrode made from a porous material such as porous carbon or passivated porous silicon, and an electrolyte. The hybrid electrochemical capacitors can have enhanced voltage and energy density compared to other electrochemical capacitors, and enhanced power density compared to batteries.
Publication number: US2015179356A1 | Search similar patents
The present invention relates to a supercapacitor, particularly a lithium-ion capacitor. In order to obtain particularly good electronic properties such as an improved rate capacity in particular, the supercapacitor comprises: - an anode having a nano-structured network made from a mixed conductor conductive for electrons and lithium ions; - a static capacitive electrode; - a separator arranged between the anode and the cathode; and - an electrolyte arranged between the anode and the cathode. The present invention further relates to a method for producing a supercapacitor.
Publication number: WO2014037156A1 | Search similar patents
Organic electrolyte for supercapacitor, containing redox active material
The present invention relates to an organic electrolyte for a supercapacitor, containing a redox active material, and is applied to the supercapacitor so as to increase energy density.
Publication number: WO2016072623A1 | Search similar patents
Electric energy storage devices
This invention relates to novel type electrochemical devices such as capacitors or batteries, among other devices, which have high capacitance or power to volume or weight ratios, or which have other valuable characteristics, and which are characterized by the practical use of one or more phenomena, including pseudocapacitance, "kinetic reversibility" (passage of approximately equal and substantial charge or discharge currents at about the same rate), "coulombic reversibiiity" (passage of substantially equal numbers of coulombs in the charging and discharging of the device), distinguishable energy states of electrodeposited species on surfaces, creation of surface layers, electrochromic effects, negative differential resistance, and frequency multiplying effects which occur during, or as a result of, the formation or modification of an electrodeposited layer or layers on, or separation of charges in double layers in, one or more electrodes and/or as a result of the reaction(s) occurring between electrode and electrolyte.
Publication number: EP0078404A3 | Search similar patents
Modified carbon materials for use in energy storage devices
Electrodes for energy storage devices comprising modified carbon materials with organic redox moieties covalently attached to the carbon surface.
Publication number: EP2886537A1 | Search similar patents