79results about How to "Improve electrochemical energy storage performance" patented technology

The invention discloses a spherical covalent organic framework material, a preparation method and application thereof. The spherical covalent organic framework material is of a hollow or solid spherical structure with the diameter controllable within the range of 500-1500 nanometers. The preparation method of the spherical covalent organic framework material comprises the step that under the condition of being free of a template agent, a polyamino monomer and a polyaldehyde monomer of 9,9'-spirobifluorene are subjected to a reversible Schiff base reaction to form a spherical structure. The method is free of a template, the preparation process is simple and easy to operate, the product yield is high, and the product has good thermal stability. The preparation method can realize controllable structure, and can obtain the spherical covalent organic framework material with a hollow or solid spherical structure. The spherical covalent organic framework material has a large specific surface area and a rich pore structure, is conveniently functionally compounded with other materials, and has a wide application prospect in the fields of gas storage and separation, catalysis, sensing, energy storage and conversion, drug delivery and the like.

The present invention relates to a preparation process of a phosphorus-and-nitrogen-doped graphene porous carbon composite material. The preparation process comprises the following steps: (1) hydrothermal reaction: dissolving a nitrogen source into deionized water, adding a graphene oxide solution and performing ultrasound for a pre-set time, adding a phosphorus source and performing ultrasound for a pre-set time to obtain a mixed solution, and then transferring the mixed solution to a high pressure reactor and performing the hydrothermal reaction to obtain a hydrogel, wherein the nitrogen source is one or more of aromatic polyamines, and the phosphorus source is phosphoric acid or phosphate; (2) oxidative polymerization: adding the hydrogel in step (1) into a ferric chloride solution after the hydrogel is cooled, and sealing and standing the mixed solution under a predetermined temperature for a pre-set time to obtain a composite hydrogel; and (3) carbonization activation. The preparation method has the advantages of simplicity, low cost and high production efficiency, no pollutants generate, and the prepared phosphorus-and-nitrogen-doped graphene porous carbon composite materialhas excellent specific capacitance value, high cycle stability, high energy density and excellent electrochemical performance when the material is applied to super capacitor electrodes.

The invention discloses a method for synthesizing a graphene-nickel hydroxide composite supercapacitor electrode by using a one-step hydrothermal method. The method for synthesizing the graphene-nickel hydroxide composite supercapacitor electrode by using the one-step hydrothermal method comprises the following steps that: a non-ionic type polymer surfactant P123 (polyethylene oxide-polyoxypropylene-polyethylene oxide triblock copolymer) and oxidized graphene are dispersed in deionized water by ultrasonic dispersion, so that a uniform dispersion liquid can be formed; soluble nickel salt and urea are added into the above uniform dispersion liquid, the uniform dispersion liquid is stirred, so that a precursor solution can be obtained; and the precursor solution is transferred into a hydrothermal reactor, pre-washed foamed nickel is immersed in the precursor solution in the hydrothermal reactor, and the pre-washed foamed nickel and the precursor solution are subjected to a hydrothermal reaction for 24 hours under 100 DEG C to 180 DEG C, a graphene-nickel hydroxide composite can be grown and deposited on the surface of a foamed nickel substrate, so that an active electrode can be formed. The synthesizing method is simple, is easy to control and is low in cost. The active electrode prepared by using the synthesizing method has high specific capacitance and high rate performance.

The invention relates to a preparation method of a shell-imitated layered high-strength graphene composite electrode material. A shell in the nature is mainly formed through organic/inorganic micro-nano multi-level layer-by-layer assembling and synergetic interface interaction and shows excellent toughness and mechanical strength. Enlightened by a multi-level layered structure and a synergetic interface of the natural shell, graphene oxide (inorganic phase) and polyaniline-halloysite nanocomposite (organic phase) are used to bionically prepare the high-strength graphene composite electrode material through pi-pi conjugation, hydrogen bonds and electrostatically synergetic interface interaction, and the tensile strength of the material is three times that of the natural shell. Meanwhile, excellent flexibility is shown when the material is applied to an all-solid-state super capacitor, the assembled all-solid-state flexible super capacitor maintains good energy-storing stability no matter in a spreading, bending or stretching state or after 5,000 times of 180-degree bending, and therefore the material has broad application prospects in aerospace, intelligent wearable devices and other energy-storing fields.

The invention provides a molybdenum ditelluride electrochemical energy storage material which is molybdenum ditelluride (MoTe2) in a metastable state, a expression formula is 1T' MoTe2, and the morphology is a nano flower structure or nanosphere structure assembled by ultrathin nanosheets. The invention also provides a preparation method and application of the molybdenum ditelluride electrochemical energy storage material. The metastable-state hexagonal-phase molybdenum ditelluride nano flower structure or nanosphere structure with a uniform size and a regular shape is prepared by using oleylamine as a reducing agent and molybdenum hexacarbonyl or molybdenum pentachloride as a precursor matter, injecting a Te-trioctylphosphin precursor at certain temperature and controlling reaction temperature and reaction time. The material shows excellent super capacitor energy storage performance and is suitable for the new energy development field.

An additive for electrochemical energy storages is disclosed, wherein the additive contains at least one silicon- and alkaline earth metal-containing compound V1 which in contact with a fluorine-containing compound V2 in the energy storage forms at least one compound V3 selected from the group consisting of silicon- and fluorine-containing, lithium-free compounds V3a, alkaline earth metal- and fluorine-containing, lithium-free compounds V3b, silicon-, alkaline earth metal- and fluorine-containing, lithium-free compounds V3c and combinations thereof. Also disclosed is an electrochemical energy storage containing the additive.

The invention discloses an in-situ preparation method for a cubic copper oxide/graphene aerogel composite material. The method comprises the following steps of: S1) putting a copper net into 1-3M hydrochloric acid, absolute ethyl alcohol and deionized water in turn, performing ultrasonic cleaning and then drying; S2) dispersing graphene oxide into the deionized water and ultrasonically treating for 1-3 hours, thereby acquiring a graphene oxide dispersion liquid in the concentration of 1-5mg mL-1; S3) pouring the graphene oxide dispersion liquid acquired in the step S2) into an autoclave liner, putting the copper net acquired in the step S1) into the autoclave liner and performing hydrothermal reaction, wherein the temperature of the hydrothermal reaction is at 120-200 DEG C and the reaction time is 6-15h; and S4) taking out the product acquired from the step S3), quenching and performing freeze drying, thereby acquiring the copper oxide/graphene aerogel composite material, wherein the freeze drying time is 12-48h, the freeze drying temperature is at -30 to -50 DEG C and the vacuum degree is at 10-30Pa.

The invention discloses a preparation method of a three-dimensional porous graphene material. The method includes: stirring hot melt resin powder, a template agent and deionized water evenly together,then transferring the mixture into a reaction kettle, conducting a period of treatment at certain temperature, then performing furnace cooling to room temperature, then drying moisture, finally transferring the product into a heating furnace for pyrolysis in vacuum or protective atmosphere environment, washing the pyrolysis product with deionized water to neutral, and performing drying to obtainthe three-dimensional porous graphene material. The obtained three-dimensional porous graphene material has a specific surface area of greater than 800m<2>/g, shows excellent electrochemical energy storage performance in lithium ion battery negative electrode materials, and at the same time the material can be expanded and applied to supercapacitors.

The invention discloses a carbon-based anchored non-noble metal monatomic catalyst as well as a preparation method and application thereof, and the preparation method comprises the following steps: adding a nitrogen source, a surfactant and a sulfur source into deionized water, heating and stirring to form a uniform turbid liquid, wherein the nitrogen source is melamine or urea, and the surfactantis P123, F108, F127 or polyethylene glycol 2000,the sulfur source is N-acetyl-L-cysteine, L-cysteine, sulfur powder, sodium thiosulfate, or sodium persulfate; drying the turbid liquid; and heating to550-1000 DEG C under a protective gas, carbonizing for 60-360 minutes, and naturally cooling to room temperature to obtain a carbon defect porous nanosheet; adding the carbon defect porous nanosheetand chromium chloride into ethanol, stirring at normal temperature, and centrifugally drying; and corroding the obtained product with a diluted hydrochloric acid solution, and centrifugally drying toobtain the product. The product disclosed by the invention provides a powerful active site for ORR.

The present disclosure provides an electrochemical energy storage device, which comprises a cell, an electrolyte and a package. The electrochemical energy storage device further comprises a binding material positioned between the cell and the package. The binding material comprises an adhesive layer and a covering layer. The adhesive layer is directly or indirectly adhered and positioned on an outer surface of the cell, and a surface of the adhesive layer which is far away from the cell is an adhesive surface; the covering layer is positioned on the adhesive surface of the adhesive layer, the covering layer is dissolved or swollen into the electrolyte in whole or in part so as to expose the adhesive surface of the adhesive layer, therefore the adhesive layer can make the cell adhered with the package. The covering layer is a polar molecule, the polar molecule comprises one or more selected from the group consisting of —F, —CO—NH—, —NH—CO—NH—, and —NH—CO—O—. The electrochemical energy storage device of the present disclosure may not only fixedly connect the cell to the package so as to resolve the problems during the drop test, but also may resolve the problem that the cell is difficult to put into the package because the two surfaces of the binding material are both adhesive, the electrochemical energy storage device also has an excellent cycle performance and an excellent charge-discharge performance under a high rate.

The invention relates to a supercapacitor electrode composite material and a preparation method thereof, belonging to the technical field of energy storage and conversion. The electrode composite material is a nano sheet material compounded by a metal organic framework compound and a conductive polymer which is polymerized in situ in holes of the metal organic framework compound, wherein the conductive polymer is formed by doping iodine ions and chloride ions or iodine ions and acetate ions twice. According to the invention, the advantages of high specific surface area, abundant reactive sitesand good conductivity of the conductive polymer of the metal organic framework compound are combined, the metal organic framework compound, the conductive polymer, the iodine simple substance and hydrochloric acid or glacial acetic acid are used as raw materials, the conductive polymer monomer is evaporated to the metal organic framework compound in a gas phase manner, and doping is performed twice. The electrode composite material provided by the invention is used for a supercapacitor electrode, has the characteristics of the large capacity, the good energy storage performance and the high stability and the like, and is simple in preparation process, low in cost and convenient for batch production.

The invention relates to a 3D honeycomb-like foam carbon material, a preparation method and applications thereof, and belongs to the technical field of materials. According to the method, Fagopyrum tataricum is used as a raw material, an alkali solution is used as an activator, a gel is formed and dried, the dried gel is carbonized, and finally impurity removing, washing and drying are performed to prepare the 3D honeycomb-like foam carbon material. According to the present invention, the method has characteristics of simpleness, easy operation, mild reaction condition, convenient post-treatment, high yield (24.5%) and low cost, and is suitable for large-scale industrial production; and the obtained carbon material has a honeycomb-like multi-level pore structure, and a large number of micropores and mesopores are uniformly distributed on the single layer plane; with the application of the 3D honeycomb-like foam carbon material as an electrochemical capacitor electrode material, the 3Dhoneycomb-like foam carbon material has excellent electrochemical energy storage performance, and is the excellent electrode material; and the 3D honeycomb-like foam carbon material can be further developed into a supercapacitor, and has potential and broad application prospects in the field of electrochemical energy storage.

The invention relates to the field of materials, and particularly relates to a method for preparing graphene and graphene. The method comprises the following steps: performing at least one time of high pressure homogenization treatment on a graphene oxide solution in a pressure condition of 1150-1250BAR, to obtain a first solution; after the first solution is uniformly dispersed, performing hydrothermal reaction for 5-7 hours in the condition of 170-185 DEG C, and then naturally cooling to obtain graphene. By adopting a method of preparing graphene by treating graphene oxide with a high pressure homogenization method and then reducing, the conjugation effect of the graphene oxide is improved, the interlayer spacing of the graphene oxide is increased, and the layer number is reduced, so that the electrochemical energy storage performance of the graphene prepared by reduction is promoted.

The invention relates to a uniformly-compounded tin sulfide-nickel sulfide heterogeneous nanosheet array structure loaded on the surface of a conductive substrate, and a preparation method thereof, and belongs to the technical field of new energy material preparation. The main body part of the product is a uniformly-compounded tin sulfide-nickel sulfide nanosheet, and vertically and closely growson the surface of a conductive substrate to form an array structure. The one-step solvothermal preparation method adopts nickel chloride, stannic chloride and thioacetamide as a nickel source, a tin source and a sulfur source respectively, a mixed solution of alcohol and water as a solvent and the conductive substrate as a skeleton, and effectively controls the growth rate of nickel sulfide by controlling the addition amount of water in order to achieve the synthesis of the product. The product obtained by the method has the advantages of high yield, high purity, controllable morphology and nopost-treatment; and the method has the advantages of simple devices and processes, strict and controllable synthesis growth conditions, high product yield, low cost, and clean and environmentally-friendly production process. Additionally, the product has an excellent electrochemical energy storage performance.

The invention provides a preparation method of a nano-porous carbon material. The preparation method comprises the following steps: step (A) mixing alkaline waste liquid with water, and performing freeze-drying to obtain a solid mixture, wherein the alkaline waste liquid is produced in the chemical de-ashing process of coal; step (B) carrying out medium temperature treatment on the solid mixture to obtain a pretreated product; and step (C) carrying out high temperature activation on the pretreated product to obtain the nano-porous carbon material. According to the preparation method, the alkaline waste liquid produced in the chemical de-ashing process of coal is used as a raw material, alkali and a small amount of metal ions in the waste liquid are used as an activator and a pore-forming agent of the activation process, and finally the obtained nano-porous carbon material has a large specific surface area, can be used as an electrode material to be applied to supercapacitors and exhibits a high electrochemical energy storage performance. The experimental results show that the porous carbon material as an electrode material has the capacity of 221 F/g after circulating for 1000 times at the electric current density of 1 A/g.

The invention discloses a preparation method of a supercapacitor. The supercapacitor is prepared by taking polyvinyl alcohol, potassium hydroxide, a cellulose/graphene/silver nanoparticle/iron sesquioxide composite thin film as raw materials through the steps of preparing polyvinyl alcohol/potassium hydroxide gel electrolyte, preparing a gel film-containing cellulose/graphene/silver nanoparticle/iron sesquioxide thin film, and preparing a symmetric all-solid-state flexible supercapacitor. The supercapacitor is assembled by taking the cellulose/graphene/silver nanoparticle/iron sesquioxide flexible composite thin film as anode and cathode, so that the supercapacitor has enough toughness, the bending state does not influence the electrochemical behaviors, the supercapacitor has high energy density, rate capability and repeated charging/discharging stability, and the supercapacitor can be connected in series or parallel to serve as a power supply for driving small electronic equipment towork.

The invention relates to pomelo valve-based porous activated carbon as well as a preparation method and application thereof, and belongs to the technical field of materials, and the method specifically comprises the following steps: cleaning pomelo valves, freeze-drying, adding into a phosphoric acid aqueous solution, carrying out hydrothermal reaction, centrifuging to take a precipitate after thehydrothermal reaction is finished, washing and drying the precipitate, carrying out carbonization treatment to obtain a precursor, removing impurities from the precursor, and drying again to obtain the porous activated carbon. Compared with other biomass-derived carbon materials, the porous activated carbon material has higher specific surface area and capacitance performance, has better electrochemical energy storage performance through detection, is an excellent electrode material, can be further developed and prepared into a supercapacitor, and has potential and wide application prospectsin the field of electrochemical energy storage. The preparation process of the porous activated carbon is simple and easy to operate, mild in reaction condition, convenient in post-treatment, high inyield (20%), low in cost and suitable for expanded production.

The invention discloses a preparation method of a composite electrode material and a product thereof, and the specific preparation method comprises the following steps: preparing carbon dots from a compound containing at least one element of nitrogen, boron, phosphorus and sulfur and citric acid, then carbonizing under an alkali-containing condition to form a porous carbon dot material, washing the formed porous carbon dot material to be neutral, further soaking with a solution containing a polymerization initiator, drying, and carrying out gas-phase polymerization with a conductive polymer monomer to obtain a carbon dot/conductive polymer composite electrode material; the preparation method is simple and low in cost; the prepared composite material has excellent structure and performance, shows excellent electrochemical energy storage performance when being used as a supercapacitor electrode material, and has a wide application prospect in the field of preparation of cheap, environment-friendly and high-performance supercapacitors.

The invention discloses a functionalized graphene oxide/poly(3,4-ethylene dioxythiophene) composite material and a preparation method thereof. The composite material of the invention is prepared by the method comprising the following steps of: (1) adding graphene oxide, 2-thiophene acetic acid, and p-toluenesulfonic acid amide to a solvent, performing ultrasonic oscillation, and then performing an esterification reaction under the protection of nitrogen to obtain functionalization graphene oxide GO-TAA; (2) adding the GO-TAA and the 3,4-ethylene dioxythiophene to an acetonitrile solution, performing a ultrasonic treatment for 30 minutes, then dropwise adding an anhydrous ferric chloride solution dissolved in nitromethane, stirring the mixture at room temperature for reaction, washing and drying a product to obtain the composite material GO-TAA-PEDOT. The composite material prepared by the method not only makes an interface uniformly composite, but also has high specific capacity and cycle stability.

The invention discloses graphene/poly (3, 4-ethylenedioxythiophene) self-supporting film and a preparation method thereof. The preparation method of the self-supporting film comprises the following steps of (1) adding a 3,4-ethylenedioxythiophene monomer into a graphene oxide aqueous dispersion, stirring to obtain a mixed dispersion liquid, then adding FeCl3, and oscillating to form hydrogel; (2)using a scraper to apply the hydrogel to a hydrophilic-based glass substrate by a scraping coating method, and uniformly forming a film; (3) putting the uniformly-formed material into a mixed solutionof hydroiodic acid and acetic acid for soaking, and then heating and reacting, and repeatedly washing with deionized water and ethyl alcohol for several times separately, and finally carrying out freeze drying on the material to finally obtain the graphene/poly (3, 4-ethylenedioxythiophene) self-supporting film material (C-PEDOT/f-rGO). The self-supporting film disclosed by the invention can be used for removing a current collector to be directly used as an electrode, and has relatively high specific capacity and cycling stability.