3754results about "Hybrid/EDL manufacture" patented technology

The invention relates to the technical field of supercapacitors, and provides a cement-based supercapacitor, a preparation method and application. The cement-based supercapacitor comprises a cement-based electrolyte and two structural electrodes arranged on the two sides of the cement-based electrolyte. The cement-based electrolyte is prepared from cement, alkali, alkali metal salt, water and an additive, wherein the alkali metal salt comprises lithium salt; each structural electrode is composed of foamed nickel loaded with nitrogen-doped reduced graphene oxide. The lithium salt is added to construct an efficient ionic conductive network, so that the ionic conductivity of the cement-based electrolyte is enhanced, and the electrochemical performance is obviously improved. The reduced graphene oxide in the structural electrode is doped with nitrogen to enhance the electrostatic force between ions and the surface of the electrode, so that the electrochemical stability of the surface of the electrode is improved, and self-discharge is effectively inhibited. By improving an electrolyte and a structural electrode material, a cement-based supercapacitor with specific capacitance and mechanical properties is obtained and is combined with a building structure to realize building energy storage.

The invention discloses a cement-based structure supercapacitor and a wall energy storage system, and relates to the technical field of energy storage. Wherein the cement-based structure super capacitor comprises a capacitor positive electrode, a capacitor negative electrode and a cement-based solid electrolyte; the capacitor positive electrode and the capacitor negative electrode are made of carbon nanomaterials; the cement-based solid electrolyte comprises cement, a conductive additive and a transition metal oxide; the cement-based solid electrolyte is arranged between the capacitor positive electrode and the capacitor negative electrode. According to the technical scheme, the energy storage performance of the super capacitor with the cement-based structure can be improved.

An electrode including a substrate, a binding compound, and a composite. The composite includes jute-activated carbon and a nickel-cobalt-layered double hydroxide (NiCoLDH). Particles of the NiCoLDH are in the form of nanoflowers with an average size of 5-15 μm. The nanoflowers comprise nanosheets with an average thickness of 5-20 nm. The particles of the jute-activated carbon are in the form of interconnected nanosheets, which form a porous carbon framework. The porous carbon framework connects the nanoflowers, thereby forming an interconnected structure in the composite. A mixture of the composite and the binding compound is coated on the surface of the substrate. The electrode can be included in supercapacitors and power banks.

The invention discloses a method for preparing a supercapacitor electrode through high-temperature alkali activation. The method comprises the steps of preparing porous carbon, preparing an electrode plate, preparing a supercapacitor, and carrying out electrochemical performance testing and material characterization testing. When the carbon precursor of the supercapacitor electrode material is prepared, organic components in walnut shells can be refined and removed and biochar is left by utilizing the effect of removing organic matters in biomass at high temperature of a tubular furnace; the potassium hydroxide with different concentrations is used as the activating agent to activate the biochar, the porosity and the internal structure richness of the porous carbon can be greatly improved, and compared with traditional solid alkali activation, the aqueous solution alkali activation has the advantages that the reliability and the possibility are improved, and the contact area of the activating agent and substances is increased. The electrode material prepared by the method has the advantages of low manufacturing cost, small environmental pollution and excellent service life, and is an ideal electrode material.

The invention relates to the technical field of mesoporous carbon material preparation, in particular to a high-temperature mesoporous carbon preparation method which comprises the following steps: S1, mixing a metal halide and an inorganic hydrogen bond donor, and heating and stirring until a solution is clear to obtain an inorganic eutectic solvent; s2, mixing the inorganic eutectic solvent and a biomass raw material for reaction; s3, filtering and washing the material obtained in the step S2; and S4, carbonizing the material obtained in the step S3 in a high-temperature inert atmosphere to obtain the high-temperature mesoporous carbon. According to the method, the wood fiber biomass such as the lowest-value straw, the lowest-value bamboo and the lowest-value wood dust is directly used as raw materials, component separation does not need to be conducted on the wood fiber biomass, and high-value utilization of a large amount of low-value wood fiber biomass can be achieved. The method is relatively simple in process, relatively mild in condition and relatively high in product yield, and an activating agent does not need to be used. The biomass mesoporous carbon prepared by the method also has a high specific surface area in a huge mesoporous volume state, and the specific capacitance in an alkaline electrolyte exceeds 260F / g.

A method for manufacturing a dry electrode for an energy storage device are disclosed. The system includes a first dry electrode material delivery system configured to deliver a dry electrode material, a first calendering roll, a second calendering roll, and a controller. The second calendering roll is configured to form a first nip between the first calendering roll and the second calendering roll. The first nip is configured to receive the dry electrode material from the first dry electrode material delivery system, and form a dry electrode film from the dry electrode material. The controller is configured to control a rotational velocity of the second calendering roll to be greater than a rotational velocity of the first calendering roll.

The invention discloses a preparation method of an MOF / graphene oxide / conducting polymer ternary composite material, which comprises the following steps of: firstly, growing MOF particles on a graphene oxide sheet in situ by utilizing multiple hydrogen bonds and pi-pi interaction of rich oxygen-containing functional groups on the surface of graphene oxide and an MOF ligand; a functional dopant is utilized to modify an MOF / graphene oxide binary composite material, a conductive polymer monomer is introduced on the basis, and a chemical oxidation polymerization method is utilized to prepare the MOF / graphene oxide / conductive polymer ternary composite material. The method is simple in preparation process and convenient to operate, the prepared ternary composite material constructs a three-dimensional porous structure with lamellar lap joint, and in-situ growth of the MOF and the conductive polymer on the surface of the graphene oxide nanosheet is beneficial to improvement of energy density and cycling stability of the composite material serving as a supercapacitor electrode material.

The invention relates to an electrode preparation method, an electrode prepared by the electrode preparation method and an energy storage device comprising the electrode, and the preparation method comprises the following steps: (1) preparing an electrode diaphragm: (a) mixing materials: uniformly mixing an electrode active material, a conductive additive and a non-fibrillated binder, then adding a fibrillated binder, and uniformly mixing the materials to obtain the electrode diaphragm; processing the obtained mixture to be flocculent or muddy; or uniformly mixing the electrode active material, the conductive additive, the non-fibrillated binder and the fibrillated binder, and processing the obtained mixture to be flocculent or muddy; (b) forming: forming the flocculent or muddy product obtained in the step (a) into an electrode membrane; and (2) depositing a current collector: depositing a metal layer on one surface of the electrode diaphragm obtained in the step (1) through a physical deposition method to serve as the current collector. The energy storage device provided by the invention has improved cycle performance, rate capability and first coulombic efficiency.

The invention belongs to the technical field of capacitor carbon preparation, and particularly relates to coal tar-based capacitor carbon and a preparation method and application thereof. Comprising the following steps: by taking coal tar as a carbon source, carrying out Friedel-Crafts reaction under the action of a cross-linking agent and a catalyst to obtain a tar-based cross-linked polymer; and carbonizing the tar-based cross-linked polymer at 600-900 DEG C in a protective gas atmosphere to obtain the coal tar-based capacitor carbon. The coal tar is used as a carbon source, the coal tar is subjected to Friedel-Crafts reaction to obtain the coal tar-based hypercrosslinked polymer, the hypercrosslinked polymer can be directly subjected to one-step high-temperature carbonization without any activating agent to obtain the high-performance coal tar-based capacitor carbon, the method is simple, the cost is low, the carbon yield is high, and the method is suitable for industrial production. The prepared capacitor carbon has a high specific surface area, abundant micropores and a disordered structure, is applied to a supercapacitor as an electrode material, and shows excellent electrochemical performance and stability.

The invention discloses a preparation method and application of three-dimensional intercalation multidirectional conductive MXene-based aerogel, and relates to the technical field of advanced electrochemical energy storage materials and devices. According to the MXene / conductive polymer and nanofiber composite aerogel developed by the invention, the two-dimensional conductive material, the pseudocapacitance polymer and the high-performance nanofiber are integrated in a three-in-one manner, so that collaborative optimization of conductivity, the number of active sites and structural stability is realized, and inherent defects of a single-component material are fundamentally avoided; and a universal solution is provided for solving the industrial problem of unbalanced performance of the electrode material.

A supercapacitor including a negative electrode, a positive electrode, an electrolyte, and a separator. The separator is between the negative electrode and the positive electrode, and the electrolyte is present in and on the separator. The negative electrode and the positive electrode include a carbon material selected from a poly-anthraquinone sulfide activated carbon material and a poly-anthraquinone sulfide reduced activated carbon material.

The present invention relates to a flexible iron aluminate cement-based supercapacitor and a preparation method thereof. The flexible iron aluminate cement-based supercapacitor is assembled with rGO / Ni as the positive electrode, rGO@α-Fe2O3 spindle / Ni as the negative electrode, and polyacrylamide-cement-emulsion-latex powder-water-KOH as the flexible cement-based solid electrolyte. Compared with the prior art, the flexible energy storage cement-based material, as a new type of building material integrating structure / function, realizes the integration of flexible lightweight design and functional technology. Its flexible characteristics can closely fit complex-shaped buildings and have good adaptability to special-shaped curved building structures. At the same time, a non-destructive construction process can also be adopted, and the energy storage function can be imparted to the existing structure by an external pasting method, so that the energy storage function can be imparted without structural reconstruction.

A nanocomposite electrode and a supercapacitor device including said nanocomposite electrode. The nanocomposite electrode includes a mixture of at least one binding compound, at least one conductive additive, and at least one molybdenum doped carbon material coated onto a substrate. The supercapacitor device includes two nanocomposite electrodes disposed facing one another, wherein the substrate of each nanocomposite electrode is coated with the mixture on an inside facing surface and the outer surfaces of the nanocomposite electrodes are not coated with the mixture, and the inside facing surfaces are separated by at least one electrolyte.

The application provides a cement-based zinc ion hybrid capacitor, a preparation method thereof and application of the capacitor in an energy storage device. The cement-based zinc ion hybrid capacitor comprises an active carbon positive electrode, a zinc foil negative electrode and a composite air-entraining mortar interlayer arranged between the two electrodes. The active carbon positive electrode is active carbon loaded on a carrier with good conductivity, and the carrier is any one of carbon-based materials such as carbon felt, carbon fiber and graphite plate or any one of foils, meshes and foams of metals such as stainless steel, copper, titanium and nickel and alloys thereof. The composite air-entraining mortar interlayer between the two electrodes is immersed in an electrolyte under negative pressure. The composite air-entraining mortar has interconnected pores, and ions are transmitted through the electrolyte in the pores and participate in electrode reactions. The application mainly provides a porous cement-based solid electrolyte based on a composite air-entraining technology and a structural electrochemical energy storage device, and the structural energy storage device can simultaneously have good energy storage characteristics and mechanical properties.

The invention belongs to the technical field of supercapacitor materials, and particularly relates to a coal-based porous carbon material and a preparation method and application thereof. In order to solve the problems of safety, batch stability and easy formation of a pore structure in a process for preparing porous carbon from coal, the method comprises the following steps: firstly, carrying out mixing and kneading treatment on fine-particle raw material coal and a liquid-phase doping agent, and then carrying out drying-low-carbon integrated treatment on the mixture; then activating the low-carbon material at a high temperature by means of water vapor, and then performing refined pore-forming on the cavity structure at a high temperature by means of carbon dioxide gas; after the activation reaction is finished, carrying out impurity removal treatment on the activated material with the high specific surface area by virtue of an acid-base solution; and depositing a layer of organic polymer on the surface of the purified material by adopting an atomic layer deposition technology, and forming a passivation layer on the polymer layer by virtue of high-temperature treatment, thereby obtaining the coal-based porous carbon material with stable performance and structure, and further applying the coal-based porous carbon material to the negative pole piece of the supercapacitor.

The invention provides a full-cement-based supercapacitor and a preparation method thereof, and relates to the technical field of supercapacitors. The full-cement-based super capacitor comprises a first cement-based electrode, a second cement-based electrode, and a foaming cement isolation layer between the first cement-based electrode and the second cement-based electrode. The invention constructs a full-cement type super capacitor with a cement-based electrode and a cement-based diaphragm, and the capacitor is low in cost, has relatively high structural stability, excellent physical performance, high assembly efficiency and good durability, and is expected to be applied to actual engineering.

The invention relates to the field of capacitor electrode materials, and discloses a porous carbon material and a preparation method thereof, a lithium ion capacitor positive electrode and a lithium ion capacitor, the specific surface area of the porous carbon material is 1500-3500m < 2 > / g, and the powder conductivity is not less than 50S / m; in an X-ray diffraction pattern of the porous carbon material, a characteristic peak of a (002) crystal face exists at 26 + / -0.5 degrees, and the half-peak width of the characteristic peak of the (002) crystal face is 0.4-1 degree. The porous carbon material is used as a positive electrode of a lithium ion capacitor, and has the characteristics of high specific capacity and good rate capability.

The invention relates to the technical field of supercapacitors, in particular to an alkali-activated solid-waste-based supercapacitor and a preparation method thereof.The preparation method comprises the steps that industrial solid waste and fiber forestry and agricultural residues are subjected to co-pyrolysis to form organic-inorganic composite solid waste gelling powder, an alkali activator and a functional additive are added to prepare alkali-activated slurry, and the alkali-activated slurry is prepared; pouring, molding and curing to obtain an alkali-activated solid waste-based electrolyte substrate; the method comprises the following steps: performing high-temperature pyrolysis, activation and the like on granular agricultural and forestry wastes to prepare a carbon-based composite conductive material, and preparing a biochar electrode plate; the preparation method comprises the following steps: taking PVDF as a raw material, bonding and curing the PVDF and the raw material, immersing the PVDF and the raw material into a KOH solution containing a PVA thickener, inserting a glass fiber diaphragm, and regulating and controlling the use amount of PVDF and other binders and a solvent system to optimize slurry viscosity and film forming uniformity so as to obtain an electrode film with mechanical flexibility and interface adhesive force; the composite electrode forms a stable composite interface in the process of being in contact with an alkali-activated electrolyte interface, and the phenomena of interface aging and capacitance attenuation caused by mismatching between the electrode and the electrolyte in a traditional cement-based system are effectively avoided.

A heating circuit for an energy storage device having a core with an electrolyte, inputs, a capacitance across the electrolyte and the core, and internal surface capacitance between inputs which can store electric field energy between internal electrodes of the energy storage device that are coupled to the inputs, including: a power supply coupled to an input, the power supply provides positive and negative input currents to one input, the positive input current flows in to the input and the negative input current flows out of another input; and a controller that switches between the positive and negative input currents to provide the positive input current and the negative input current to the one of the inputs at a frequency sufficient to effectively short the internal surface capacitance of the energy storage device to generate heat and raise a temperature of the electrolyte.

The invention relates to a porous carbon material as well as a preparation method and application thereof. The specific surface area of the porous carbon material is 1500-3000m < 2 > / g, and pore channels are intensively distributed in a range of 0.6-2.0 nm. The preparation method of the porous carbon material comprises the following steps: (1) montmorillonite acid treatment; (2) uniformly mixing the acid-treated montmorillonite obtained in the step (1) with asphalt, and carrying out carbonization treatment to obtain a carbonized material; and (3) under the inert atmosphere condition, mixing the carbonized material with an activating agent for activation, and then washing and drying. The porous carbon material obtained by the invention has the advantages of large specific surface area, reasonable pore size distribution, high ion transmission speed and the like, and is a super-capacitor carbon material with excellent rate capability.

The invention relates to the field of electrode material preparation, in particular to a graphene local in-situ coated electrode material and a preparation method thereof. The preparation method comprises the following steps: mixing a powdery electrode material with graphite, wherein the mass ratio of the graphite to the powdery electrode material is (0.0001-0.01): 1; and then mechanical grinding is carried out, so that the graphite forms graphene in situ under the action of mechanical force, the surface of the electrode material is coated with the graphene in situ by utilizing the adsorption force of a newly-generated nano surface and mechanical work, and the graphene locally-modified composite electrode material is obtained. According to the preparation method, extremely low graphite consumption is controlled, in-situ generation and coating of graphene are realized by utilizing a mechanical grinding one-step method, complex steps such as independent preparation of graphene and high-temperature sintering are omitted, the process is simple, and the cost is low; and the complete shielding of an ion transmission channel is avoided while an electronic conductive network is effectively constructed, so that the capacity, the cycling stability and the rate capability of the electrode material are remarkably improved.

The invention provides a carbon mineralization structure supercapacitor and a preparation method and application thereof. The supercapacitor with the carbon mineralization structure comprises an electrode, the electrode comprises a carbon mineralization gel material, a carbon conductive material and foam metal, and the carbon conductive material is distributed in a three-dimensional space formed after the carbon mineralization gel material is carbonized and wraps the foam metal together; the electrodes are arranged on the two sides of the solid electrolyte layer, and the preparation raw materials of the solid electrolyte layer comprise a carbon mineralization cementing material, bicarbonate, a fiber material, a porous micro-nano material, an air entraining agent and an inorganic salt aqueous solution, raw materials for preparing the solid electrolyte layer are mixed, pressed and carbonized to form the solid electrolyte layer. The carbon mineralization structure supercapacitor provided by the invention breaks through the bottlenecks of low strength and poor energy storage performance of a traditional cement-based capacitor, has excellent mechanical properties and electrical properties at the same time, and is low in cost and environment-friendly.

The invention relates to the technical field of polymer photoelectric materials, in particular to a preparation method of a supramolecular gel electrolyte. The method comprises the following steps: esterifying tetraphenylethylene alcohol and methacryloyl chloride to form tetraphenylethylene methacrylate, and performing staged linear heating polymerization on the tetraphenylethylene methacrylate, 3-(methacrylamido) propyl dimethyl 3-thiopropyl ammonium oxide inner salt, acrylic acid, tetraphenylethylene methacrylate and 4-vinylpyridine under the action of ammonium persulfate to obtain a tetraphenylethylene copolymer. And finally, soaking in a lithium chloride aqueous solution to obtain the supramolecular hydrogel electrolyte. The hydrogel obtained by the invention has high mechanical strength and high ionic conductivity, and is suitable for energy storage devices such as flexible supercapacitors and the like.

The invention discloses a biological carbon / graphene composite material as well as a preparation method and application thereof. The method comprises the following steps: impregnating a biomass raw material with a copper salt solution to obtain a precursor; the precursor is pyrolyzed to obtain a copper oxide modified biological carbon material, then under the conditions of reducing atmosphere and high temperature, carbon dioxide serves as a carbon source, graphene is generated on the copper oxide modified biological carbon material in situ, the biological carbon / graphene / copper composite material is obtained, and the biological carbon / graphene / copper composite material is subjected to copper leaching treatment to obtain the graphene / copper composite material. Obtaining a finished product. The composite material has excellent electrochemical performance, and has excellent rate capability, capacitance and long cycle service life when being used for preparing a capacitor. The preparation method is simple, low in cost and suitable for industrial production.

A miniature supercapacitor comprises a first monomer unit and a first negative pole unit capable of being connected with the first monomer unit, the first monomer unit comprises a first shell and a first positive pole, a first containing cavity is formed in the first shell, the first positive pole is arranged in the first containing cavity, and the outer wall of the first positive pole is attached to the inner wall of the first containing cavity; the first negative pole column unit comprises a first negative pole column capable of being embedded into the first positive pole column, a first diaphragm layer wrapping the peripheral surface of the first negative pole column and a first sealing rubber ring which sleeves the upper end of the first negative pole column and is used for sealing the first accommodating cavity, and a first positioning hole for embedding the first negative pole column is formed in the first positive pole column; by limiting the structural design of the miniature capacitor, the electrode column and the shell directly serve as the current collector, the contact between the electrode material and the current collector is more compact through unique electrode material coating, rolling and rolling modes, the material is uniform, the structure is firm, the process is simple, and the internal resistance of the capacitor is greatly reduced.

To provide a positive electrode active material with high capacity and good cycle characteristics.SOLUTION: A positive electrode active material exhibits minimal change in crystal structure between the charged and discharged states. For example, a positive electrode active material that has a layered rock-salt crystal structure in the discharged state and a pseudo-spinel crystal structure in the charged state at a high voltage of about 4.6 V exhibits less change in crystal structure and volume between charge and discharge than known positive electrode active materials. When this pseudo-spinel crystal structure is present, diffraction peaks appear at 2θ=19.30±0.20° and 2θ=45.55±0.10° when analyzed by XRD.SELECTED DRAWING: Figure 1

The invention relates to the technical field of capacitor electrode materials, in particular to a biomass derived porous carbon and layered double hydroxide (LDH) composite material and a preparation method and application thereof. The invention provides a preparation method of a biomass-derived porous carbon and LDH composite material, which is characterized by comprising the following steps: mixing biomass-derived porous carbon, nickel salt, cobalt salt, ethylene glycol, hexamethylenetetramine and water, and carrying out hydrothermal reaction to obtain the biomass-derived porous carbon and LDH composite material, the pore structure of the biomass derived porous carbon comprises micropores, mesopores and macropores. The biomass derived porous carbon and LDH composite material has good specific capacitance, energy density and cycling stability, and can be used as a high-performance supercapacitor electrode material.

The invention discloses a foamed nickel loaded cobalt sulfide / nickel sulfide NF-CoS / NiS. The foamed nickel loaded cobalt sulfide / nickel sulfide NF-CoS / NiS is prepared by the following steps: firstly, taking foamed nickel NF as a substrate, loading cobalt hydroxide on the surface of the NF through first electrodeposition, then converting the NF into ZIF-67 through an impregnation method, then vulcanizing through thioacetamide and hydrothermal reaction, and finally loading Ni3S2 nanoparticles through second electrodeposition. The nickel foam loaded cobalt sulfide / nickel sulfide NF-CoS / NiS can be obtained. The preparation method comprises the following steps: 1, preparing foamed nickel electro-deposition cobalt hydroxide; 2, preparation of the foamed nickel loaded cobalt hydroxide / ZIF-67; 3, cobalt hydroxide / cobalt sulfide NF-Co / CoS is loaded on the foamed nickel; and 4, preparation of the foamed nickel loaded cobalt sulfide / nickel sulfide NF-CoSX / Ni3S2. When the material is used as a supercapacitor material, charging and discharging are carried out in a voltage window range of 0-0.5 V, and when the current density is 1mA cm <-2 >, the area specific capacitance is 8-9F cm <-2 >; and when the current density is 10mA cm <-2 >, 70-80% of the initial capacity is still kept after 5000 charge-discharge cycles are carried out.

The invention discloses a polyaniline composite flexible electrode material, a preparation method and a supercapacitor, and the preparation method comprises the following steps: introducing sodium sulfonate and cyano into an aniline structure through a two-step method, and obtaining modified aniline; the preparation method comprises the following steps: mixing graphene oxide with 3-aminopropyltriethoxysilane for reaction to obtain modified graphene oxide; then, by taking polyvinyl alcohol as a space stabilizer and a template agent, mediating in-situ polymerization of aniline, modified aniline and modified graphene oxide to obtain a polyaniline derivative prefabricated solution; and then hydrophilic hydrogel is introduced to prepare the polyaniline composite flexible electrode material. The polyaniline composite flexible electrode material provided by the invention is good in cycling stability and excellent in electrochemical performance and mechanical performance, and when the composite flexible electrode material is assembled into a supercapacitor, the specific capacitance value and cycling stability of the supercapacitor can be remarkably improved.

The invention provides a three-dimensional superstructure carbon electrode for a supercapacitor, the interior of the three-dimensional superstructure carbon electrode contains round holes with the aperture of 1-10 microns, the volume of the three-dimensional superstructure carbon electrode is 0.014-0.018 cm <-3 >, and the invention further provides a preparation method of the three-dimensional superstructure carbon electrode. Compared with the prior art, modeling software is adopted to design the three-dimensional superstructure of the carbon electrode, high customization of the electrode structure can be achieved, the method based on computer aided design allows the size and overall layout of unit lattices to be accurately controlled, and therefore the electrode performance is optimized.