305results about "Reduction-oxidation hybrid capacitors" patented technology

Graphitic nanofibers, which include tubular fullerenes (commonly called "buckytubes"), nanotubes and fibrils, which are functionalized by chemical substitution, are used as electrodes in electrochemical capacitors. The graphitic nanofiber based electrode increases the performance of the electrochemical capacitors. Preferred nanofibers have a surface area greater than about 200 m2 / gm and are substantially free of micropores.

The invention provides part solid, part fluid and flow electrochemical cells, for example, metal-air and lithium-air batteries and three-dimensional electrode arrays for use in part solid, part fluid electrochemical and flow cells and metal-air and lithium-air batteries.

A zinc ion-exchanging battery device comprising: (A) a cathode comprising two cathode active materials (a zinc ion intercalation compound and a surface-mediating material); (B) an anode containing zinc metal or zinc alloy; (C) a porous separator disposed between the cathode and the anode; and (D) an electrolyte containing zinc ions that are exchanged between the cathode and the anode during battery charge / discharge. The zinc ion intercalation compound is selected from chemically treated carbon or graphite material having an expanded inter-graphene spacing d002 of at least 0.5 nm, or an oxide, carbide, dichalcogenide, trichalcogenide, sulfide, selenide, or telluride of niobium, zirconium, molybdenum, hafnium, tantalum, tungsten, titanium, vanadium, chromium, cobalt, manganese, iron, nickel, or a combination thereof. The surface-mediating material contains exfoliated graphite or multiple single-layer sheets or multi-layer platelets of a graphene material.

Ionically conducting, redox active additive composite electrolytes are disclosed. The electrolytes include an ionically conductive component and a redox active additive. The ionically conductive component may be an ionically conductive material such as an ionically conductive polymer, ionically conducting glass-ceramic, ionically conductive ceramic, and mixtures thereof. Electrical energy storage devices that employ the ionically conducting, redox active additive composite electrolytes also are disclosed

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.

A supercapacitor comprising a two electrodes, a porous separator disposed between the two electrodes, and an ionic liquid electrolyte in physical contact with the two electrodes, wherein at least one of the two electrodes comprises a meso-porous structure being formed of a plurality of nano graphene platelets and multiple pores having a pore size in the range of 2 nm and 25 nm, wherein the graphene platelets are not spacer-modified or surface-modified platelets. Preferably, the graphene platelets are curved, not flat-shaped. The pores are accessible to ionic liquid molecules, enabling the formation of large amounts of electric double layer charges in a supercapacitor, which exhibits an exceptionally high specific capacitance and high energy density.

An energy storage device includes a first electrode comprising a first material and a second electrode comprising a second material, at least a portion of the first and second materials forming an interpenetrating network when dispersed in an electrolyte, the electrolyte, the first material and the second material are selected so that the first and second materials exert a repelling force on each other when combined. An electrochemical device, includes a first electrode in electrical communication with a first current collector; a second electrode in electrical communication with a second current collector; and an ionically conductive medium in ionic contact with said first and second electrodes, wherein at least a portion of the first and second electrodes form an interpenetrating network and wherein at least one of the first and second electrodes comprises an electrode structure providing two or more pathways to its current collector.

Graphitic nanofibers, which include tubular fullerenes (commonly called "buckytubes"), nanotubes and fibrils, which are functionalized by chemical substitution, are used as electrodes in electrochemical capacitors. The graphitic nanofiber based electrode increases the performance of the electrochemical capacitors.

A novel nanocarbon composite structure is provided having trapped ruthenium oxide. By using Ketjen black, and through chemical-mechanical effect utilizing an ultracentrifugal reaction field, both the specific surface area of ruthenium oxide and space of electrode material are expanded to have nanoparticles of ruthenium oxide highly dispersed in a graphene layer. This nanocarbon composite structure having trapped ruthenium oxide exhibits high electrochemical activity and is suitable for use as an electrical energy storing device, such as a large-capacity capacitor.

The present invention relates to a method for manufacturing a nano-structured metal oxide electrode, and in particular, to a method for manufacturing a metal oxide electrode having a few tens or hundreds of nanometers in diameter that is well adapted to an electrode of a supercapacitor using an alumina or polymer membrane having nano-sized pores as a template. Preferred methods for manufacturing a nano-structured metal oxide electrode comprises steps of preparing an alumina or polymer template having a plurality of nano-sized pores; sputtering a metal acting as a current collector with a few tens of μm of thickness in one surface of the alumina template; charging the template, after the sputtering step, by submerging it into a precipitation solution having a metal salt dissolved therein, and applying a static current or electrode electric potential thereby electrochemically precipitating a metal oxide in the nano-sized pores of the template; a step in which the composite of the alumina or polymer template and the metal oxide are contacted with a sodium hydroxide solution or other base to remove the alumina or polymer template; and an optional drying step to provide the nano-structured metal oxide electrode.

A rechargeable energy storage device is disclosed. In at least one embodiment the energy storage device includes an air electrode providing an electrochemical process comprising reduction and evolution of oxygen and a capacitive electrode enables an electrode process consisting of non-faradic reactions based on ion absorption / desorption and / or faradic reactions. This rechargeable energy storage device is a hybrid system of fuel cells and ultracapacitors, pseudocapacitors, and / or secondary batteries.

An ultracapacitor or hybrid capacitor includes an electrically non-conductive rigid or semi-rigid porous honeycomb structure (12) having cells extending along a common direction and having an average density per unit area within in a plane perpendicular to the common direction exceeding 15.5 per square centimeter, desirably formed of a material that is stable at temperatures of 300° or more, such that high temperatures processing can be used to help ensure high purity of the final product. The material may desirably be an oxide or non-oxide ceramic, such as cordierite, silicon nitride, alumina, aluminum titanate, zircon, glass, or glass-ceramic.

An electrode composite body including a conductive polymer film in which the doping and dedoping capacities of the conductive polymer are improved, an electrolyte, and a redox capacitor including those are provided. The object is achieved by the followings: (1) an electrode composite body including a conductive polymer and an electrode for redox capacitors; (2) an electrode composite including a conductive polymer film and an electrode body for redox capacitors; (3) an electrolyte for redox capacitors that contains an ionic liquid as an essential component; (4) a redox capacitor composed of an electrolyte containing an ionic liquid as an essential component and an electrode composite body for redox capacitors; and (5) a composite body in which the anionic component contained in the ionic liquid and is the same component as a part of the dopant of the conductive polymer.

The electric current collector of the present invention comprises a substrate composed of aluminum, a junction layer, formed on the surface of the substrate, in which aluminum and an electrically conductive material having electrical conductivity have been mixed, and an electrical conductor layer, formed on the junction layer, comprising the electrically conductive material. The electrode and the charge accumulating device of the present invention employ the electric current collector of the present invention.

A solid state energy storage device has two electrodes, a membrane separator and a solid electrolyte having a substantially solid solvent, a salt and a mediator. The energy storage device stores electric charge by both Faradaic and non-Faradaic systems. The energy storage device may include activated carbon mixed with the electrolyte and sonicated to provide connection between the activated carbon and the mediator. The energy storage device is hot pressed to increase conductivity. The two electrodes may be asymmetric in amount of reduced and oxidized species of mediator.

It discloses a hybrid supercapacitor including a carbon aerogel cathode and a surface-oxidized transition metal nitride aerogel anode which is able to increase energy density and power density with increase of overall cell potential and at the same time lower internal resistance of the electrode and equivalent series resistance by using a monolithic electrode with no use of current collector and binder.

The present invention discloses an improved electrode for a supercapacitor and a method of preparation thereof. The inventive electrode comprises a collector, a carbon substrate disposed on the collector comprising ultrafine carbon fibers having a specific surface area of at least 200 m2 / g (BET) and a d002 value of 0.36 nm or less, and a metal oxide thin layer formed on the carbon substrate. The electrode of the subject invention retains a high specific capacitance during high-speed charging and discharging cycles.

Provided is a new charge storage device structure, incorporating a double layer supercapacitor (DLS) material, electrochemical supercapacitor (ECS) material and / or battery material. More specifically, the DLS material, ECS material and / or battery material may form multilayer electrode structures. Additionally or alternatively, the DLS material, ECS material and / or battery material may form electrode structures in which the DLS material, ECS material and / or battery material are in contact with both a common current collector and electrolyte. The present invention can be generalized towards other energy storage devices, opening a new avenue for a large spectrum of device applications.

Disclosed is an electricity storage device which can be charged / discharged at high rate and have high output, high capacity and excellent repeating charge / discharge characteristics, although it uses a non-carbon material as a negative electrode active material. Specifically disclosed is an electricity storage device comprising: a positive electrode collector; a positive electrode disposed on the positive electrode collector and including a positive electrode active material which can reversibly absorb / desorb at least anions; a negative electrode collector; and a negative electrode disposed on the negative electrode collector and including a negative electrode active material which can substantially absorb / desorb lithium ions reversibly. The negative electrode active material is composed of at least one substance selected from the group consisting of silicon, a silicon-containing alloy, a silicon compound, tin, a tin-containing alloy, and a tin compound; and the negative electrode is formed as a thin film having a thickness of 10 μm or less.

The present invention relates to an electrochemical energy storage device referred to herein as a Metal / Ion Pseudo-Capacitor (MIPC). The MIPC stores charge through reversible metal electro-deposition and dissolution processes as anode functionality and ion adsorption / desorption processes, faradaic processes or both as cathode functionality.

An electrochemical device comprises a pair of electrodes having electrode layers formed on strip-like collectors except on their strip-like portions along a longitudinal side of the strip-like collectors; strip-like separators insulating these; two collector plates connected to the strip-like portions; a case accommodating these; a lid for sealing the case; a pair of terminals connected to the collector plates and being connectable to an outside of the case. The pair of terminals is respectively connected to the lid and the case, and the pair of electrodes are wound interposing the separators therebetween, and the strip-like portions are located on both end surfaces. The electrochemical device has high volume density and low internal resistance and it can be manufactured in short time.

The present invention aims at: providing an accelerated reaction in a liquid-phase reaction; forming, by way of the reaction, a metal oxide nanoparticle and carbon that carries the metal oxide nanoparticle in a highly dispersed state; and providing an electrode containing the carbon and an electrochemical device using the electrode. In order to solve the above-mentioned problem, shear stress and centrifugal force are applied to the reactant in the rotating reactor so that an accelerated chemical reaction is attained in the course of the reaction. Further, the carbon carrying a metal oxide nanoparticle in a highly dispersed state comprises: a metal oxide nanoparticle produced by the accelerated chemical reaction, wherein shear stress and centrifugal force are applied to a reactant in a rotating reactor in the course of the reaction; and carbon dispersed in the rotating reactor by applying shear stress and centrifugal force. An electrochemical device produced by using the carbon carrying the metal oxide nanoparticle as an electrode has high output and high capacity characteristics.

A redox active reversible electrode includes a conductive substrate and a redox active film formed on at least one surface of the conductive substrate. The redox active film contains a redox active sulfur compound and an electrically conductive polymer of a π electron conjugated compound having p-type doping characteristics.

Provided is a supercapacitor having an anode, a cathode, a porous separator / electrolyte, wherein at least one of electrodes contains an integral 3D graphene-carbon hybrid foam composed of multiple pores and pore walls, wherein the pore walls contain single-layer or few-layer graphene sheets chemically bonded by a carbon material having a carbon material-to-graphene weight ratio from 1 / 100 to 1 / 2, wherein the few-layer graphene sheets have 2-10 layers of stacked graphene planes having an inter-plane spacing d002 from 0.3354 nm to 0.40 nm and the graphene sheets contain a pristine graphene material having essentially zero % of non-carbon elements, or a non-pristine graphene material having 0.01% to 25% by weight of non-carbon elements wherein said non-pristine graphene is selected from graphene oxide, reduced graphene oxide, graphene fluoride, graphene chloride, graphene bromide, graphene iodide, hydrogenated graphene, nitrogenated graphene, doped graphene, chemically functionalized graphene, or a combination thereof.

An object of the present invention is to provide an energy device excellent in input / output characteristics at a low temperature and various applications using the same. The present invention consists in an energy device comprising a positive electrode having a region where a faradic reaction occurs, and a negative electrode having a region where a faradic reaction occurs, wherein at least one of the positive and negative electrodes has a region where a faradic reaction having a reaction rate higher than that of the faradic reaction occurs or a region where a non-faradic reaction occurs.

A hybrid energy storage device has at least one lead-based positive electrode and at least one carbon-based negative electrode, a separator between the electrodes, a casing which will contain the electrodes and separator, and an acid electrolyte. The separator is gas permeable, and is capable of absorbing and entraining acid electrolyte. The separator has a finite capacity for absorption of acid electrolyte, and the quantity of acid electrolyte which is present in the cell is less than the finite capacity of the separator. Upon assembly of the cell, the casing is sealed, and there is no liquid acid electrolyte within the assembled cell.

The present invention provides a photochargeable layered capacitor comprising a layered capacitor unit and a photovoltaic electrode unit. The layered capacitor unit comprises an outer counter-electrode layer, an outer storage material layer, a separator impregnated with an ionic electrolyte, an inner storage material layer and an inner counter-electrode layer in this order. The photo-voltaic electrode unit comprises a transparent substrate, a transparent conductive layer, a semiconductor layer and a charge transfer layer in this order. The charge transfer layer of the photovoltaic electrode unit is in junction with an outer surface of the inner counter-electrode layer of the layered capacitor unit. The inner counter-electrode layer comprises a single metal sheet.

A process for producing a supercapacitor cell, comprising: (a) Continuously feeding a conductive porous layer to a cathode material impregnation zone, wherein the conductive porous layer contains interconnected electron-conducting pathways and at least 70% by volume of pores; (b) Impregnating a wet cathode active material mixture (containing a cathode active material and an optional conductive additive mixed with a liquid electrolyte) into pores of this porous layer to form a cathode electrode; (c) Preparing an anode electrode in a similar manner; and (d) Stacking an anode electrode, a porous separator, and a cathode electrode to form the supercapacitor, wherein the anode electrode and / or the cathode electrode has a thickness no less than 100 μm; and / or wherein the anode or cathode active material constitutes an electrode active material loading no less than 7 mg / cm2 in the anode or the cathode.