142results about How to "Good capacitance characteristics" patented technology

The invention discloses a method for preparing electrodes of a dissymmetric super capacitor based on nickel foam. The method comprises the steps: washing the nickel foam, soaking the nickel foam into a graphene oxide aqueous solution to obtain nickel foam in which graphene oxide deposits, serving the nickel foam in which the graphene oxide deposits as precursor materials, and respectively adopting a three-electrode method for preparaing a positive electrode and a negative electrode of the dissymmetric super capacitor, wherein the positive electrode is composed of composite materials of graphene, a carbon nanometer tube and the nickel foam, and the negative electrode is composed of composite materials of graphene, manganese dioxide and the nickel foam. The invention further discloses some other methods for preparing the electrodes of the super capacitor based on the similar principle, and products which correspond to the methods. By means of the methods and the products, respective high-ratio capacitance characteristics of the composite materials are fully played, and energy density of the super capacitor is improved. In addition, usage of various combined reagents can be avoided, and accordingly large-batch industrial production is conducted in a mode of convenient control, low cost and low energy consumption.

The invention discloses a method for preparing a porous (micro-porous and mesoporous) carbon micron tube from catkin, poplar seed or phoenix tree seed as a raw material. According to the method disclosed by the invention, the porous carbon micron tube can be prepared from natural biomasses such as the poplar seed, the catkin or the phoenix tree seed by using a chemical activation method, a physical activation method and a chemical and physical activation method under different conditions. The method disclosed by the invention has the characteristics of simple process, low cost, environment friendliness and the like. The specific surface area of the obtained micro-porous carbon micron tube can reach 1000-2000m<2> / g and the specific surface area of the obtained mesoporous) carbon micron tube can reach 500-1000m<2> / g. The porous carbon micron tube obtained by the method disclosed by the invention has the advantages of large specific surface area, developed porous structure, favorable catalytic oxygen reduction performance and favorable capacitance characteristic and can be used as an electrode material of a supercapacitor and a fuel cell.

A transition metal / carbon nanotube composite includes a carbon nanotube and a transition metal oxide coating layer disposed on the carbon nanotube. The transition metal oxide coating layer includes a nickel-cobalt oxide

The present invention relates to a high frequency module board device having a high frequency transmitting and receiving circuit for modulating and demodulating a high frequency signal. The high frequency module board device comprises a base board (2) whose main surface is formed as a build-up surface (2a) and a high frequency circuit part (3) formed on the build-up surface of the base board (2) and having passive elements formed. The base board (2) has an area (29) in which wiring is not formed in a lower layer from a fourth wiring layer (8b). The high frequency circuit part (3) has an upper electrode part (36) and a lower electrode part (35) in positions corresponding to the area (29) in which the wiring is not formed. Thus, since a capacitance (18) is provided just above the area (29) in which the wiring is not formed, a parasitic capacity that the capacitance (18) receives from ground patterns (14) is reduced. Accordingly, the characteristics of the capacitance (18) can be improved.

The invention relates to a method for manufacturing an electrode material of a supercapacitor by a cotton-stalk-based active carbon material. The method comprises the following steps of: firstly removing skin and crushing a cotton stalk raw material, mixing and dipping with an activating agent, and carrying out processes of activation treatment, washing, drying and the like to obtain an active carbon electrode material required by the supercapacitor. The electrode material of the supercapacitor prepared by the method provided by the invention has higher specific surface area and excellent capacitance characters. An assembled simulation button type supercapacitor has higher specific capacitance, smaller equivalent series resistance, higher charge and discharge efficiencies and the like. The method disclosed by the invention is of important significance to increase an economical additional value of cotton stalk, realize sustainable development on the cotton stalk, improve the performance of supercapacitor and reduce the production cost.

The invention relates to a preparation method for nitrogen-doped ordered mesoporous carbon / carbon fiber composite material, and belongs to the technical field of mesoporous carbon-based carbon fiber composite material preparation. The preparation method mainly comprises the step that triblock copolymers serve as a structure-directing agent, phenolic resin prepolymers serve as a carbon source, ethyl orthosilicate serves as a silicon source, ethyl alcohol serves as a solvent, silk fibers serve as a nitrogen source and a substrate, the silicon dioxide component is removed through soaking, solvent evaporation induced self-assembly, crosslinking, high-temperature calcinations and etching, and finally the nitrogen-doped ordered mesoporous carbon / carbon fiber composite material with a high specific surface (230m<2> / g) is obtained. The preparation method has the advantages that the preparation process is simple, cost is low, and mass production is facilitated. The obtained carbon material can be used for double electric layer capacitors; at the scanning speed of 5mV / s, specific capacitance is 190F / g, and 90-percent capacitance is left over after 1,000 times of circulation.

The dielectric ceramic has a composition represented by general formula 100(Ba1-x-ySrxCay)m(Ti1-zZrz)O3+aBaO+bR2O3+cMgO+dMnO+eCuO+fV2O5+gXuOv (where R is a rare-earth element such as La, Ce or Pr; and XuOv is an oxide group including at least Si); and 0≦x≦0.05, 0≦y≦0.08 (preferably 0.02≦y≦0.08), 0≦z≦0.05, 0.990≦m, 100.2≦(100 m+a)≦102, 0.05≦b≦0.5, 0.05≦c≦2, 0.05≦d≦1.3, 0.1≦e≦1.0, 0.02≦f≦0.15, and 0.2≦g≦2. With this composition, a monolithic ceramic capacitor retaining good dielectric characteristics and temperature characteristics even if a high field strength voltage is applied by further thinning the dielectric layers thereof and having excellent reliability achieving good isolating property, dielectric strength, and high-temperature load life is obtained.

A dynamic random access memory (DRAM) and a manufacturing method thereof are disclosed. A storage cell of the DRAM includes a FINFET and a capacitor. A gate of the FINFET is formed by a metal nitride or a carbonized metal having the effect of stress-induced strain. A gate dielectric of the FINFET and / or a dielectric of the capacitor can be formed by a ferroelectric material having negative capacitance characteristics. A strained-gate engineering is used in the invention achieve effects of (1) increasing ferro-electricity of the dielectric to enhance the operation speed and endurance of the FINFET; and (2) enhancing the ferro negative capacitance effect to improve the sub-threshold swing of the FINFET, so that the switching power and the off-current of the FINFET can be reduced and the charge retention capability of capacitor can be effectively enhanced to improve the operation characteristics of the DRAM.

The invention discloses a preparation method and an application of a nitrogen-doped carbon fiber / nitrogen-doped graphene / bacterial cellulose membrane material, relates to a preparation method and an application of a membrane material and aims to solve the problem that a flexible electrode material prepared with a conventional method does not have good stability, cycle performance and mechanical properties. The method comprises the following steps: preparing bacterial cellulose pulp; preparing a bacterial cellulose and graphene composite; preparing a polypyrrole coated bacterial cellulose and graphene composite; preparing a nitrogen-doped carbon fiber / nitrogen-doped graphene composite through high-temperature carbonization; preparing a nitrogen-doped carbon fiber / nitrogen-doped graphene dispersing agent; performing vacuum pumping filtration on the bacterial cellulose pulp for membrane forming, adding the dispersing agent for continuous pumping filtration for membrane forming, and performing vacuum drying for finishing. The membrane material has low equipment corrosion, low cost, good cycle performance and good mechanical properties and can realize scale production, and a symmetrical supercapacitor prepared from the membrane material has the good capacitive character. The invention belongs to the technical field of nanomaterials.

The invention discloses a carbon-nano-tube prepared from poplar catkin and willow catkin as raw materials and a preparation method. The carbon-nano-tube is prepared from poplar catkin and willow catkin as raw materials by using a carbonization method. The obtained carbon-nano-tube has the external diameter of 2-20 microns and the wall thickness of approximate 0.1-1.0 micron. The method for preparing the carbon-nano-tube comprises the following steps of: putting the poplar catkin or the willow catkin in a middle area of a silica tube in a tubular furnace, and increasing the temperature to 250-2000 DEG C under the inert atmosphere; and carbonizing for 10-180 min and naturally cooling to a room temperature under the inert atmosphere to obtain a product. Compared with an artificially synthesized carbon-nano-tube, the preparation method provided by the invention has the advantages of simple and convenient process, environmental protection, and the like, the prepared carbon-nano-tube presents favorable performance in aspects of catalytic oxygen reduction reaction, electrochemical capacitors, and the like and can be used as electrodes of fuel batteries and super capacitors. In addition, the prepared carbon-nano-tube has potential application values in aspects of ion batteries, drug delivery, microreactors, and the like.

The invention discloses a method for preparing a hollow tubular activated carbon electrode material for a supercapacitor from cotton. The method comprises the following steps: removing impurities from a cotton raw material, washing, drying carbonizing, mixing the cotton raw material with an alkaline activator for activation, washing, drying and the like to obtain the hollow tubular activated carbon electrode material for the supercapacitor. The electrode material for the supercapacitor, which is prepared by the method, has a relatively high specific surface area and a relatively good capacitance characteristic, and has a special hollow tubular morphology. The method is of great significance in increasing the economic added value of the cotton, reducing exploitation of a high-quality coal resource so as to realize a concept of low carbon, environment friendliness and green living, improving the performance of the supercapacitor and reducing the production cost.

There are provided an electrode assembly, a battery cell including the electrode assembly, and a device including the electrode assembly. The electrode assembly includes a combination of two or more electrode units having the same width and different lengths, wherein the electrode units are stacked so that a stepped portion is formed between the electrode units, and electrodes having different polarities face each other at an interface between the electrode units.

A preparation method of a kapok-based hollow porous carbon microtubule or porous carbon microstrip comprises the following steps: dispersing kapok in a mixed solution composed of ethanol and a sodiumchlorite solution by ultrasound for immersion, or dispersing kapok in a sodium hydroxide solution for immersion, filtering, vacuum-drying to obtain tubular kapok or strip-shaped kapok, impregnating the tubular kapok or strip-shaped kapok in a diammonium hydrogen phosphate solution, drying, carrying out preoxidation, carbonizing, washing, vacuum-drying to obtain cured tubular kapok or cured strip-shaped kapok, carrying out ultrasonic dispersion by impregnating the cured tubular kapok or cured strip-shaped kapok and phosphoric acid in deionized water, drying, and activating to obtain the kapok-based hollow porous carbon microtubule or porous carbon microstrip. The product has advantages of high rate capability and high specific power.

A semiconductor capacitor structure includes a first metal layer, a second metal layer, a first set of via plugs, a second set of via plugs, and a dielectric layer. The first metal layer includes a first portion, a plurality of parallel-arranged second portions, a third portion, and a plurality of parallel-arranged fourth portions. The second metal layer includes a fifth section, a plurality of sixth sections, a seventh section, and a plurality of eighth sections. The first set of via plugs electrically connects the plurality of second sections to the plurality of sixth sections. The second set of via plugs electrically connects the plurality of fourth sections to the plurality of eighth sections.

The invention provides a self-supporting type nano-porous nickel / nickel oxide combined electrode plate and a preparation method thereof. The electrode plate is composed of a current collector and active substance, the current collector is composed of a nickel-based amorphous alloy base body and nano-porous nickel, and the active substance is nano nickel oxide which grows on the surface of the nano-porous nickel. The cross section of the electrode plate comprises three layers, the middle core layer is the nickel-based amorphous alloy base body, the surfaces of the two sides of the middle core layer are covered by combined electrode material layers composed of nano-porous nickel and nano nickel oxide, the thickness of the electrode plate is 25-35 micrometers, the thickness of each nano-porous nickel / nickel oxide combined electrode material layer is 2.1-3.5 micrometers, and the nickel-based amorphous alloy is composed of Ni40 + x (Ti0.35 Zr0.45 Al0.20) 60 - x (x=0-5). The effective specific area of active substance NiO is improved, the actual capacitance characteristic, which can be given to play in a super capacitor, of nickel oxide is improved, and the specific capacitance of the combined electrode plate can reach up to 847.9 F / cm<3>.

An electrical double-layer capacitor electrode with excellent capacitance characteristics is obtained together with a manufacturing method therefor.Paper-molded sheet 2 of carbon nanotubes is integrated with etched foil 1 constituting a collector, by means of bumps and indentations 1a formed on the surface of etched foil 1 to prepare an electrical double-layer capacitor electrode. Alternatively, carbon nanotubes 4 grown around core catalyst particles on substrate 3 are integrated with etched foil 1 by means of bumps and indentations 1a formed on the surface of etched foil 1 to prepare an electrical double-layer capacitor electrode. To manufacture these electrodes, this carbon nanotube sheet 2 or substrate 3 with carbon nanotubes grown thereon is laid over bumps and indentations la on the surface of etched foil 1, and the sheet or substrate and the foil are pressed under 0.01 to 100 t / cm2 of pressure to integrate the carbon nanotubes with the etched foil.

The invention discloses a method for preparing nano trimanganese tetroxide. The method is characterized by comprising the steps of by selecting waste banana peels as a raw material, drying in air, cutting into small pieces, heating with water, extracting active ingredients, reacting with potassium permanganate, filtering, and drying to obtain the nano trimanganese tetroxide which has the particle size of 10-80 nanometers, has good capacitance property and high energy storage property and serves as an electrode material for supercapacitors. Compared with the prior art, the method has the advantages that the preparation process is simple, low in cost, environmental friendly and rich in resource, and the product has the application advantage and has good economic, social and ecological benefits.

The invention relates to a modified carbon material and a preparation method thereof, cathode lead paste, a polar plate and a lead carbon battery. The preparation method comprises the steps of 1 crushing biologic material, wherein the biologic material is one or more of starch, lignin, corn cores, rice hull, ears, trees, shells, coconut shells, leaves and straw; 2, processing the crushed biologic material by inorganic strong acid and / or inorganic strong base solution, filtering and thereby obtaining a precursor; 3, placing the precursor into aqueous solution comprising high hydrogen evolution overpotential metal salt, dispersing by supersonic vibration and stirring for a period, filter, cleaning and thereby obtaining the modified precursor; and 4, processing the modified precursor to obtain the modified carbon material. According to the preparation method, the modified carbon material with uniform distribution and good combinability is prepared, the hydrogen evolution overpotential of the carbon material is improved, the high-power charging and discharging performance of the lead carbon battery is enhanced, and the life of the battery is prolonged.

The invention discloses a preparation method of activated carbon for supercapacitors. The method comprises the steps of: crushing a pre-configured biomass material; subjecting the crushed biomass material to alkali treatment, then performing filtration to remove impurities from the alkali treated biomass material so as to obtain a precursor; then immersing the precursor in a potassium hydroxide solution to conduct supersonic vibration and stirring, and then performing filtering to obtain a modified precursor; heating the modified precursor, and pre-activating the modified precursor; adding a hydroxide of alkali into the modified precursor and conducting heating activation. The preparation method has a simple process, solves the problem of uneven pore distribution of carbon materials, and improves the structural consistency of carbon materials. The prepared carbon material has abundant pores, high specific surface area, and excellent capacitance characteristics, significantly improves the supercapacitor capacity and high-rate charge-discharge capacity, has good circulation performance, prolongs the supercapacitor life, and has very good economical efficiency and adaptability.

The invention discloses nitrogen-boron-doped porous carbon for an electrode of a supercapacitor and a preparation method of the nitrogen-boron-doped porous carbon, belonging to the technical field of energy source materials and application. The porous carbon is prepared from natural reed stalks as a carbon source by respectively taking a nitrogen fertilizer and a boron fertilizer as a nitrogen source and a boron source through a carbonization activation process. The prepared nitrogen-boron-doped porous carbon has a hierarchical three-dimensional pore structure containing micropores and mesopores, the main aperture distribution is 1-5 nanometers, the specific surface area is 1400m<2> / g-1700m<2> / g, the doped nitrogen atomic ratio is 6%-8%, and the doped boron atomic ratio is 2%-4%; and when the porous carbon is used as an electrode material of the supercapacitor, the specific capacitance of the porous carbon at a current density of 1A / g is 225F / g-250F / g, the preserved capacitance is higher than 95% after 5000 circulating charge-discharge processes, and the energy density at a power density of 1W / kg is 30Wh / kg-35Wh / kg.

The present invention relates to a high frequency module board device having a high frequency transmitting and receiving circuit for modulating and demodulating a high frequency signal. The high frequency module board device comprises a base board (2) whose main surface is formed as a build-up surface (2a) and a high frequency circuit part (3) formed on the build-up surface of the base board (2) and having passive elements formed. The base board (2) has an area (29) in which wiring is not formed in a lower layer from a fourth wiring layer (8b). The high frequency circuit part (3) has an upper electrode part (36) and a lower electrode part (35) in positions corresponding to the area (29) in which the wiring is not formed. Thus, since a capacitance (18) is provided just above the area (29) in which the wiring is not formed, a parasitic capacity that the capacitance (18) receives from ground patterns (14) is reduced. Accordingly, the characteristics of the capacitance (18) can be improved.

The invention discloses a method for producing porous carbon for a super capacitor by utilizing a lignosulfonate. The method is characterized by comprising the following steps of: putting calcium lignosulphonate or magnesium lignosulphonate in nitrogen or argon atmosphere and keeping at 600-800 DEG C for 1-4 hours; after cooling to the room temperature, soaking calcium lignosulphonate or magnesium lignosulphonate in diluted hydrochloric acid or diluted nitric acid having a mass concentration of 10-30%, carrying out ultrasonic dispersion to even distribution and then stirring for not less than 6 hours; next, performing suction filtering and water washing until the eluate is neutral, and then drying, thereby obtaining porous carbon material suitable for manufacturing the super capacitor. The preparation method disclosed by the invention is simple and convenient for operation; and the obtained porous carbon material can be used for preparing the super capacitor which is capable of showing excellent capacitance characteristics.

The present invention discloses a preparation method of a surface-modified manganese dioxide (MnO2) product loaded by an N-doped hollow carbon sphere (N-HCS). The method comprises the following stepsof: (1) preparing a hollow carbon sphere (HCS); (2) preparing a polydopamine-modified hollow carbon sphere (PDA-HCS); (3) preparing a graphene-modified N-doped hollow carbon sphere (N-HCS@Gr); (4) preparing a polyaniline-modified N-HCS@Gr (N-HCS@Gr@PANI); and (5) preparing a surface-modified MnO2 product loaded by an N-doped hollow carbon sphere (N-HCS@Gr@PANI@MnO2). The N-HCS@Gr@PANI@MnO2 productfully combines excellent performances of the N-doped hollow carbon sphere, a large superficial area and an excellent conductivity of graphene, reductibility and conductivity of the PANI and excellentcapacitance characteristics of the MnO2 itself, and therefore, the N-HCS@Gr@PANI@MnO2 product expresses very high specific capacitance and is electrode material of a super electrochemical capacitor with a wide application prospect.

The invention discloses a manganese dioxide film electrode with double 3-dimensional (3D) structures for a super capacitor and a preparation method thereof. The manganese dioxide film electrode is formed by covering a manganese dioxide film in the 3D structure on a current collector of foam metals such as foam nickel and the like in the 3D structure. The preparation method comprises the step thatthe reaction is directly carried out on the current collector of foam metals such as foam nickel and the like through a hydro-thermal method for preparing the manganese dioxide film. The hydro-thermal preparation process comprises steps of current collector cleaning, solution preparation, hydro-thermal reaction and the like. The prepared manganese dioxide film electrode has double 3D structures and has good capacitance characteristics and higher energy storage characteristics when being used as an electrode of the super capacitor. Compared with the prior art, the prepared manganese dioxide film electrode for the super capacitor has larger contact area of active substance and electrolyte than that of the existing manganese dioxide electrode, and higher active substance utilization rate andhigher specific capacity are realized.

The invention provides a method for preparing a cobaltous oxide / graphene nanometer composite material, which comprises the steps of performing ultrasonic processing on graphite oxide in deionized water for obtaining graphene oxide solution, dissolving Co(NO3)2.6H2O into the deionized water for obtaining cobaltous nitrate solution, then dripping NH3.H2O, dispersing a generated solid product in the deionized water for preparing cobalt hydroxide colloidal solution; mixing the cobaltous nitrate solution with the cobalt hydroxide colloidal solution, performing washing and drying; and processing at the temperature of 150-500 DEG C for obtaining the cobaltous oxide / graphene nanometer composite material. The method for preparing the cobaltous oxide / graphene nanometer composite material has advantages of simple operation, high speed, large-scale production, and environment-friendly effect.

A highly reliable ceramic electronic device having an excellent temperature characteristic of a capacitance and a low IR temperature dependency, comprising a dielectric layer: wherein the dielectric layer includes a main component expressed by a composition formula of BamTiO2+m, wherein “m” satisfies 0.995≦m≦1.010 and a ratio of Ba and Ti satisfies 0.995≦Ba / Ti≦1.010, and, as subcomponents, an oxide of Al and an oxide of Si or an oxide of R (note that R is at least one kind selected from Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu); and includes a secondary phase composed of at least a part of the oxide of Al and at least a part of the oxide of Si or the oxide of R and being different from a main phase mainly composed of the main component; and the production method are provided.