132 results about "Pseudocapacitor" patented technology

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.

The invention discloses a zinc oxide (ZnO)/reduced graphene oxide/polypyrrole (ZnO/RGO/PPy) ternary composite material, which belongs to the technical field of composite material. The ZnO/RGO/PPy ternary composite material is prepared by a two-step method, including preparing a uniformly-dispersed binary composite material ZnO/reduced graphene oxide (ZnO/RGO), and polymerizing pyrrole (Py) monomer by chemical oxidation method by using the binary composite material as a template to obtain the ZnO/RGO/PPy ternary composite material. The ZnO/RGO/PPy ternary composite material prepared by the invention has both the electric double layer capacitance characteristics of RGO and pseudocapacitor energy storage characteristics of ZnO and Ppy, so that the composite material can show high electrochemical capacitance behavior, excellent rate capability, good circulation stability, and has high energy densigh and power density, , and can be used as the electrode material of a super capacitor.

The invention discloses a preparation method of a nitrogen-doped carbon nanofiber-loaded nickel cobalt oxide composite electrode material. Polyaniline/polyacrylonitrile composite nanofiber is prepared through an electrostatic spinning technology; nitrogen-doped carbon nanofiber is obtained after carbonization treatment, and the nitrogen-doped carbon nanofiber has the advantages of high length-diameter ratio, low cost and the like; by lowering the diameter of the nanometer carbon fiber, the specific surface area of the nanometer carbon fiber can be enlarged, so that more contributions can be made for an electrical double-layer capacitor; in addition, by introduction of nitrogen atoms, the conductivity and the stability of the composite material can be improved; by virtue of nitrogen doping, a part of pseudocapacitor can be contributed, so that a supercapacitor assembled by the material can show higher specific capacitance; and the surface of the carbon nanofiber is loaded with NiCo<2>O<4> nanowires by adopting a solvothermal method, so that the composite electrode material has the characteristics of the faradaic pseudocapacitor and the electrical double-layer capacitor, and the overall specific capacitance of the electrode material can be improved.

The invention discloses a nickel-cobalt double hydroxide/NiCo<2>S<4> composite nanomaterial, a preparation method therefor, and an application of the composite nanomaterial as an electrode material of a supercapacitor. Nickel-cobalt double hydroxide nanosheets are prepared firstly by a hydrothermal method; then smaller NiCo<2>S<4> nanosheets are formed on the surfaces of the nickel-cobalt double hydroxide nanosheets through a gaseous phase hydrothermal method; compared with other nanostructures, such as nanowires, nanoparticles and the like, when the NiCo<2>S<4> nanosheets are grown on the nickel-cobalt double hydroxide nanosheets, the mutual agglomeration of the nanosheets can be prevented, and the electrochemical activity of the nanosheets can be taken into full play; and meanwhile, when the composite material is applied as the electrode material of the supercapacitor, the composite material can be used as the electrode material of the pseudocapacitor, and has relatively high specific capacitance and rate charge-discharge property.

The invention discloses a pseudocapacitor anode based on a three-dimensional multi-level nanostructure of cobalt-nickel sulfide core shell and a preparation method of the pseudocapacitor anode. The anode comprises a foamed nickel substrate 1, cobalt-nickel sulfide nanosheets 2 positioned on the foamed nickel substrate 1 and distributed in an array manner and cobalt-nickel sulfide blades 3 connected to the two sides of the cobalt-nickel sulfide nanosheets 2 and distributed in a growing array manner, wherein the cobalt-nickel sulfide nanosheets 2 are perpendicular to the foamed nickel substrate 1; the cobalt-nickel sulfide blades 3 and the cobalt-nickel sulfide nanosheets 2 are in the opposite directions along the foamed nickel substrate 1 by 0 to 90 degrees. According to the disclosed anode structure, the cobalt-nickel sulfide nanosheet array is directly grown on the highly conductive foam nickel substrate, so that the anode has the very high electron mobility and is beneficial to realization of rapid charge and discharge; meanwhile, the cobalt-nickel sulfide blades are continuously grown on the nanosheet array in situ, so that the available active surface of an electrode can be expanded, the energy density of the electrode can be increased, and the action speed of an active material and an electrolyte can be increased.

The invention discloses an ultracapacitor material with a layered double hydroxide-poly(3, 4-ethylenedioxythiophene) core-shell structure and a preparation method of the ultracapacitor material, belonging to the technical field of preparation of ultracapacitor materials. The ultracapacitor material is prepared from layered double hydroxide with electrochemical activity and poly(3,4-ethylenedioxythiophene) with good electrical conductivity. The preparation method comprises the following steps: firstly preparing a layered double hydroxide array film, and then coating a layer of poly(3,4-ethylenedioxythiophene) on a layered double hydroxide nanocrystalline array with an electrochemical deposition method, so as to form the core-shell structure. The ultracapacitor material has the advantages that layered double hydroxide nanocrystalline with an array structure can effectively suppress aggregation of active components, provides a channel for electron transfer, and ensures effective transfer of electrons during quick charging and discharging; and the introduction of a poly(3,4-ethylenedioxythiophene) shell improves the defect that the magnification performance of conventional pseudocapacitor materials is poor.

The invention provides a preparation method of a flexible supercapacitor electrode material applicable to a carbon cloth base. The preparation method comprises the following steps: after cleaning up commercial carbon cloth, putting the cleaned commercial carbon cloth into a mixed water solution of nickel nitrate, cobalt nitrate and urea in a reaction still to carry out a first hydrothermal reaction, then carrying out calcinations in an air atmosphere after cleaning and drying treatment to obtain carbon cloth on which a nickel cobaltate nanoneedle array is grown, then putting the carbon cloth into a dimethyl formamide solution of ammonium tetrathiotungstate in a reaction still to carry out a second hydrothermal reaction, and putting the carbon cloth in a nitrogen atmosphere for calcinationsafter cleaning and drying treatment so as to successfully obtain the flexible electrode material loaded with nickel cobaltate and tungsten disulfide core-shell nanowires. The manufacturing technologyis simple, the flexible electrode material is loaded on the flexible carbon cloth base so that the flexible electrode material can directly serve as electrodes without the need of an adhesive or a conducting agent, the capacitive performance is greatly improved through the composition of double electrode layers and a pseudocapacitor, the material has relatively high specific capacitance and has preferable development prospects in the field of further energy storage.

There is provided a method for producing a hybrid negative plate for a lead-acid storage battery which is improved in the production working efficiency and the productivity and enhances the quick charge and discharge characteristics and the discharge characteristics at a low temperature under PSOC of a lead-acid storage battery.

A carbon mixture sheet produced by such a way that a carbon mixture prepared by mixing two types of carbon materials consisting of a first carbon material having electroconductivity and a second carbon material having capacitor capacitance and/or pseudocapacitor capacitance, and at least a binder, is adhered by pressure to the surface of a negative plate in a wet state, so that a hybrid negative plate is produced. The lead-acid storage battery provided with the hybrid negative plate is improved in the discharge characteristics.

A nanoporous templating substrate, which is an anodically oxidized alumina (AAO) substrate, is employed to form a pseudocapacitor having high stored energy density. A pseudocapacitive material is deposited conformally along the sidewalls of the AAO substrate by atomic layer deposition, chemical vapor deposition), and/or electrochemical deposition employing a nucleation layer. The thickness of the pseudocapacitive material on the walls can be precisely controlled in the deposition process. The AAO is etched to form an array of nanotubes of the PC material that are cylindrical and structurally robust with cavities therein. Because the AAO substrate that acts as scaffolding is removed, only the active PC material is left behind, thereby maximizing the energy per mass. In addition, nanotubes may be de-anchored from a substrate so that free-standing nanotubes having randomized orientations may be deposited on a conductive substrate to form an electrode of a pseudocapacitor.

The invention discloses a nano-structure electrode for an energy storage device and a pseudocapacitor having the electrode. The nano-structure electrode has mutually-conductive and mutually-connected metal-nano-structure leading-out electrodes, wherein the surface of each leading-out electrode is wrapped with an active layer. The nano-structure electrode is also provided with a modification layer, wherein the modification layer is arranged between the surface of each leading-out electrode and each active layer. Each leading-out electrode is a metal nanowire, of which the diameter is 5 nm-500 nm, and the length is larger than 5 mum. The thickness of the active layer is 1 nm-1000 nm. The active layer is formed by stacking one or more layer of son active layers, wherein the son active layers are made of any one of transition metal oxide, conductive polymer or composite pseudocapacitor materials. The modification layer is formed by stacking one or more layer of son modification layers, wherein the son modification layers are made of metal oxide, metal nitride or metal fluoride. The nano-structure electrode has the advantage of large surface area, and the pseudocapacitor having the nano-structure electrode with the structure above is large in capacity.

The invention discloses a preparation method of a porous graphene-based composite film material. The preparation method comprises the following steps of: (1) preparing porous graphene dispersion liquid; (2) preparing a carbon nanotube and pseudocapacitor material dispersion liquid; (3) preparation of a composite film material: mixing the porous graphene dispersion liquid and the carbon nanotube and pseudocapacitor material dispersion liquid, and performing ultrasonic treatment, carrying out vacuum filtration, naturally drying a filter cake, and performing stripping to obtain a porous graphene/carbon nanotube and pseudocapacitor material composite film material. The porous graphene-based composite film material prepared by the invention can be directly used as a flexible electrode materialin the absence of a conductive agent and a binder; the material has the advantages of excellent rate capability, high energy/power density, long cycle service life, low raw material cost, simple process and environmental friendliness, and has a good application prospect in the field of electrode materials of flexible supercapacitors.

The embodiment of the invention discloses a method for manufacturing a cathode of a total-tantalum electrolytic capacitor. The method comprises the following steps of: blasting sand to polish the inner surface of a tantalum housing of the total-tantalum electrolytic capacitor; adding graphene oxide into a dispersing solvent for dispersing to obtain graphene oxide dispersion liquid; adding the graphene oxide dispersion liquid into the tantalum housing, so that the graphene oxide in the graphene oxide dispersion liquid is dispersed on the inner surface; carrying out reduction treatment onto the graphene oxide which is dispersed on the inner surface; and forming a ruthenium oxide layer on the inner surface by an electrochemical method. According to the method disclosed by the embodiment of the invention, the graphene oxide and the ruthenium oxide are compound, so that not only can the area of the cathode of the total-tantalum capacitor be greatly increased, but also the effective area of the tantalum capacitor can be increased; and a pseudocapacitor is introduced onto the tantalum housing, so that the capacity of the capacitor is improved.

The invention discloses a preparation method for preparing cobaltous phosphate ultra-small nanodisk, ultrathin nanosheet and ultrafine nanowire by a two-phase interface method. By regulating reaction time, conversion from cobaltous phosphate ultra-small nanodisk assembled to ultrathin nanosheet to ultrafine nanowire is controlled. The preparation method has a simple process, is easy to operate, is low-cost and is environmentally friendly. Raw materials are easily available. During the whole reaction process, no special equipment is required. The invention is beneficial to industrial production. By the method, an ultrafine nanowire nano-material with excellent pseudocapacitor performance is finally obtained, wherein specific capacitance of the material can reach 1174 F/g when electric current density is 2 A/g. The prepared material in the invention is an ideal supercapacitor material which has a wide commercial application prospect.

A pseudocapacitor employs plates having an active material of a nanoparticles sized ceramic mixed ionic-electronic conductor such as may have the nominal formula of ABO₃, A₂BO₄, AB₂O₄, and AO₂, where A and B are metals. The active material may be prepared to promote sublattice vacancies to provide for the storage of additional charge.

The invention discloses a method for preparing a cobaltous oxide electrode with a nanosheet structure, relates to a method for preparing an electrode, and aims at solving the problem that an existing cobaltous oxide pseudocapacitor is relatively low in specific capacitance. The method disclosed by the invention comprises the following steps: preparing a Co coating on an Si base, and then putting into a plasma enhanced chemical vapor deposition vacuum device; introducing argon, adjusting the gas flow and the pressure intensity, heating to a certain temperature, introducing oxygen, adjusting the gas flow of argon and oxygen, and adjusting the temperature, the radio frequency power and the pressure intensity; and carrying out deposition, so as to obtain the cobaltous oxide electrode with the nanosheet structure after deposition is ended. The method is used for preparing the cobaltous oxide electrode with the nanosheet structure.

The invention belongs to the technical field of fabrication of a supercapacitor electrode material, and particularly relates to a layered double hydroxide composite electrode material and preparationmethod and application thereof. Nanometer needle-shaped cobalt manganate taking foamed nickel as a substrate is prepared and obtained by a hydrothermal method and a calcination method, and then a nanosheet is formed on a surface of the nanometer needle-shaped cobalt manganate by a secondary hydrothermal method. The electrochemical activity is favorably and fully developed. The composite electrodematerial can be used as a pseudocapacitor electrode material when used as a supercapacitor electrode material, and has relatively high specific capacity and rate charge-discharge performance.

The invention discloses a method for increasing a specific capacity of a MnO2-based supercapacitor simply and quickly. The method includes: (1) dipping a MnO2 base electrode in a MnSO4 solution to enable Mn<2+> to be attached in MnO2 tunnels; (2) using the dipped MnO2 base electrode to prepare the MnO2-based supercapacitor. The prepared MnO2-based supercapacitor has the advantages that participation degree, in energy storage, of protons is increased, and the specific capacity of the MnO2-based supercapacitor is increased. The method is simple to operate, low in cost, remarkable in effect, and capable of improving MnO2 tunnel structures effectively, increasing the specific capacity of the MnO2-based supercapacitor and increasing utilizing efficiency of a MnO2-based electrode material. In addition, the method can be applied to production process of manganese-based faradaic pseudocapacitor electrodes, and also can be used as a theory to produce novel manganese ion contained electrolyte.

The invention relates to an asymmetric super capacitor with cobalt hydroxide and active carbon as the anode and the cathode respectively and a preparation method thereof. The anode adopts a carbon material/cobalt hydroxide electrode, the cathode adopts a carbon material or a foamed nickel/active carbon electrode, the anode and the cathode are separated by a diaphragm such as a polypropylene sulfonic acid membrane, an electrolyte is an alkaline aqueous solution, and a single super capacitor or super capacitor set is assembled. The cobalt hydroxide of the anode provides a pseudocapacitor and the active carbon of the cathode provides an electrical double-layer capacitor, so that the specific capacitance is effectively improved, and the electric potential working window of the capacitor is widened, thereby improving the energy density of the super capacitor. The cobalt hydroxide material of the anode takes quasi-reversible oxidation reduction reaction, and the active carbon of the cathode performs static physical absorption, so that the asymmetric super capacitor is good in cyclic stability and has a long service life. The super capacitor set adopts a flexible package form, so that the mass energy density of a super capacitor overall device is greatly improved.