39 results about "Vanadium disulfide" patented technology

The invention relates to the technical field of new energy materials, and in particular to a vanadium disulfide/graphene composite material and a preparation method therefor. The preparation method comprises the following steps: dissolving a vanadium source into water and uniformly mixing with an excessive amount of sulfur source to obtain a mixed solution A, uniformly mixing graphene oxide with the mixed solution A, performing reaction at the temperature of 150-200 DEG C, and after the reaction to obtain the vanadium disulfide/graphene composite material. The preparation method is simple in process, mature in technology, available in equipment and quite good for the commercial promotion; according to the prepared vanadium disulfide/graphene composite material, the shortcomings of the vanadium disulfide and graphene are overcome by each other; the chemical activity of the material is improved, and the vanadium disulfide/graphene composite material can be used as the chemical active material to be applied to lithium ion battery negative electrodes; and the obtained lithium ion battery is quite good in circulation reversibility and relatively high in specific capacity.

The invention provides a high-temperature stable nickel cobalt lithium manganate composite electrode, and a preparation method and application thereof. The high-temperature stable nickel cobalt lithium manganate composite electrode is of a core shell structure; nickel cobalt lithium manganate is an original core; two-dimensional nanometer materials coat the surface of the nickel cobalt lithium manganate; lithium iron phosphate coats the outer surfaces of the two-dimensional nanometer materials, wherein the two-dimensional nanometer materials comprise one material or combination of several materials from VOPO4.2H2O, vanadium disulfide, tungsten disulfide and germylene. The high-temperature stable nickel cobalt lithium manganate composite electrode provided by the invention has the advantages that the corrosion of electrolyte on the nickel cobalt lithium manganate is prevented; the high-temperature stability and the circulation stability of the nickel cobalt lithium manganate are improved; the two-dimensional nanometer materials are used as a middle layer, so that a nickel cobalt lithium manganate voltage platform can be balanced; the electric conductibility and the rate capability of the whole composite material are improved; the sharp decay of the electric conductibility of the nickel cobalt lithium manganate caused by a lithium manganese phosphate layer is prevented.

The invention relates to a graphene-modified vanadium disulfide micrometer flower material and a preparation method thereof. The graphene-modified vanadium disulfide micrometer flower material can be used as an aluminum ion battery cathode active material, and has a micrometer flower laminated structure which is self assembled by vanadium disulfide nanometer sheets, wherein graphene is uniformly distributed in the micrometer flower laminated structure, an interlayer distance of the micrometer flower laminated structure is shown in the description, and the diameter of a micrometer flower is 1-1.5 microns. The graphene-modified vanadium disulfide micrometer flower material and the preparation method thereof have the beneficial effects that the novel laminated graphene-modified vanadium disulfide electrode material is prepared through a one-step hydrothermal method, expresses high specific capacity, good cycle performance and good coulombic efficiency by larger interlayer distance of the vanadium disulfide and uniform interlayer modification on graphene when being used as the aluminum ion battery cathode active material, and is a potential application material of an aluminum ion battery; and secondly, the preparation method has the advantages of simple process, short synthesis time and mild conditions, meets the requirement on green chemistry, and is beneficial to market popularization.

The invention discloses a rose-shaped vanadium disulfide/carbon quantum-dot composite material and preparation method and application thereof. The composite material comprises vanadium disulfide/carbon quantum-dot microflowers, wherein the microflowers are in rose shapes, an arbitrary microflower comprises n nanosheets, n is more than or equal to 6, and carbon quantum dots are uniformly distributed in the nanosheets. A multi-layer structure formed by assembling the nanosheets is beneficial for full contact between an electrolyte and an active substance, the carbon quantum dots are uniformly distributed in the nanosheets, a certain buffer effect on volume expansion of the material during the charge-discharge process is achieved, so that the electrochemical performance of the material when used as a sodium ion battery negative electrode material is greatly improved. The preparation method is convenient and easy to operate by taking a hydrothermal method as foundation and is controllablein reaction condition, and experiment is easy to amplify.

The invention relates to the technical field of battery materials, in particular to a sulfur/vanadium disulfide/MXene composite material as well as a preparation method and application thereof. According to the preparation method disclosed by the invention, the sulfur loading capacity can be improved due to the high specific surface area and a large number of active sites of the sulfur loading material MXene; MXene has unique flexibility and conductivity, so that the volume change of the positive electrode material can be buffered, and the conductivity of the composite material can be improved; the surface of the MXene is provided with a large number of functional groups and static electricity, so that vanadate ions can be attracted to generate a coordination effect; the vanadate ions areuniformly adsorbed on the surface of the MXene, so that the vanadate ions and a sulfur source generate uniform vanadium disulfide nanosheets on the surface of the MXene in situ at a proper temperature; by introducing the vanadium disulfide nanosheet with catalytic activity and high conductivity into MXene, lithium polysulfide can be chemically adsorbed, and the vanadium disulfide nanosheet can bequickly catalyzed and converted into insoluble Li2S2/Li2S in an electrolyte, so that a serious shuttle effect is inhibited, the stability of the lithium-sulfur battery is improved, and the cycle lifeof the lithium-sulfur battery is prolonged.

The invention discloses a preparation method and application of aerogel vanadium disulphide. According to the preparation method, firstly, ammonium metavanadate is used as a vanadium source; thioacetamide is used as a sulphur source; the PH value is regulated by ammonium hydroxide; the mol ratio of ammonium metavanadate to thioacetamide is 1:(5 to 10); 1 to 2ml of ammonium hydroxide is used for preparing precursors; the precursors are subjected to hydrothermal reaction; after the reaction is completed, washing, drying, ultrasonic treatment and freeze drying are performed; the aerogel vanadiumdisulphide is obtained. The prepared aerogel vanadium disulphide has high specific surface area and mesoporous density, is used as an electrode material of a supper capacitor, and has high energy density and power density. The specific volume of the prepared aerogel vanadium disulphide can reach 218F g<-1> at the scanning speed of 5mvs<-1>.

The invention provides a self-repairing hydrogel, a preparation method thereof and a flexible self-repairing rechargeable battery. Vanadium salt is used as a raw material, thioacetamide is used as a sulfur source, and a hydrothermal reaction is carried out to synthesize a vanadium disulfide nanosheet growing on carbon cloth fibers, and the vanadium disulfide nanosheet is used as a positive electrode of the battery; zinc is plated on the carbon cloth through electro-deposition to serve as a negative electrode of the battery; and zinc acetate and manganese acetate are used as electrolytes and dissolved in water to form an aqueous electrolyte, and then 1797-type polyvinyl alcohol is added to form hydrogel serving as the electrolyte. The prepared battery solves the problem of poor safety facedby the current battery, the prepared hydrogel flexible zinc ion battery can still keep high stability after being damaged by bending, cutting and the like, and the material has the advantages of goodcycle performance, safety and the like when being applied to the zinc ion battery.

The invention discloses synthesis of a V3S4@CNTS electrocatalyst and application of the V3S4@CNTS electrocatalyst as an electrocatalytic cracking aquatic hydrogen catalyst. As a layered material, vanadium disulfide attracts more and more attention in recent years. However, few reports of V3S4 are provided. According to the invention, a hydrothermal-calcination two step method is used. The methodcomprises the following steps of: carrying out hydrothermal reaction on a mixed solution of a vanadium source and a carbon nano tube to obtain a composite material of vanadium oxide and carbon nano tube, mixing the vanadium oxide and sulfur in a tubular furnace, calcining, washing and drying to obtain a final product, the V3S4@CNTS electrocatalyst has uniform material chemical composition and highelectrocatalytic activity and stability in a full-PH electrolyte.

Belonging to the technical field of magnesium-lithium double-ion batteries, the invention provides a vanadium disulfide@carbon paper nanomaterial, a preparation method thereof and a magnesium-lithiumdouble-ion battery. The preparation method of the vanadium disulfide@carbon paper nanomaterial provided by the invention includes the steps of: mixing n-octylamine, NH4VO3 and thioacetamide to obtaina mixed solution; and carrying out solvothermal reaction on the mixed solution and carbon paper to obtain the vanadium disulfide@carbon paper nanomaterial. The method utilizes solvothermal process toembed octylamine micromolecules into vanadium disulfide so as to increase the interlayer spacing of Van der Waals' force, enables embedding and disembedding of magnesium ions and lithium ions jointly,and improves the battery capacity, also because the microstructure becomes open, the ion migration path is reduced, and the rate capability is improved.

The invention discloses a preparation method of a self-assembled flaky VS2/S nanosheet, which comprises the following steps: step 1, weighing a vanadium source, adding the vanadium source into absolute ethyl alcohol, and stirring by using a magnetic stirrer at room temperature to obtain a solution A with the vanadium source concentration of 0.13-0.2 mol/L; step 2, weighing 0.07-1 g of hexadecyl trimethyl ammonium bromide as a surfactant and an intercalator, slowly adding the hexadecyl trimethyl ammonium bromide into the solution A, and stirring by using a magnetic stirrer at room temperature to obtain a solution B; step 3, weighing a sulfur source, adding the sulfur source into the solution B, and stirring by using a magnetic stirrer at room temperature to obtain a solution C with the sulfur source concentration of 0.59-1.04 mol/L; step 4, transferring the solution C into a polytetrafluoroethylene lining, putting the polytetrafluoroethylene lining into a drying oven, and carrying out solvothermal reaction at the reaction temperature of 160-200 DEG C for 4-24 hours; step 5, collecting a solvothermal reaction product in a suction filtration manner, washing, and freeze-drying for 12 hours to obtain a vanadium disulfide sulfur composite material. The preparation method adopts a one-step solvothermal method, and is simple in process, low in energy consumption and high in yield.

The invention provides a vanadium disulfide nanometer rod array electrocatalyst. A preparation method of the vanadium disulfide nanometer rod array electrocatalyst comprises the following steps of soaking a conductive carbon base into a solution of NaVO3: to CH3CSNH2: to C6H12N4 according to the mass ratio of (0.1 to 0.5) to (0.2 to 0.8): to (0.5 to 1.5); after hydrothermal reaction, uniform nanometer rod-shaped VS2 is obtained. The vanadium disulfide nanometer rod array electrocatalyst has the advantages that the synthesis temperature is low; the process is simple; the operation is easy; theraw materials are cheap and can be easily obtained; the cost is low; the yield is high; the later stage treatment is not needed; the environmental-friendly effect is achieved; the electrocatalyst canbe suitable for large-scale production; the prepared product has uniform chemical composition, high purity and uniform appearance; when the electrocatalyst is used as an water electrolyticsis water electrode material, excellent electrochemical performance can be shown; the overpotential under the current density of 10mA/cm<2> is about 206mV.

The invention provides an ammonia gas sensor based on a vanadium disulfide nanosheet. The ammonia gas sensor comprises a sensing base column and the vanadium disulfide nanosheet, wherein a surface of the sensing base column is coated with the vanadium disulfide nanosheet; the average size of the vanadium disulfide nanosheet is 50-500 nm, and the PDI of the vanadium disulfide nanosheet is not greater than 0.3. The ammonia gas sensor based on the vanadium disulfide nanosheet has advantages of being high in detection limit, capable of reaching the ppm level, good in repeatability, convenient to carry, low in detection cost and the like. The invention also provides a preparation method and application of the ammonia gas sensor based on the vanadium disulfide nanosheet.

The invention provides a negative electrode material for a secondary battery, a preparation method of the negative electrode material, a negative electrode plate and the secondary battery. The negative electrode material comprises a nanocube framework and layered vanadium disulfide growing on the surface of the nanocube framework, a precursor of the nanocube framework is a zeolite imidazole metal organic framework. Compared with the prior art, the negative electrode material provided by the invention adopts the nanocube as a supporting framework and the zeolite imidazole metal organic framework as a precursor, so that the negative electrode material has relatively good stability in structure and can provide stable support for an overall layered three-dimensional structure; lamellar vanadium disulfide is grown on the surface of the nanocube framework, the lamellar vanadium disulfide is formed by S-V-S connection, the interlayer distance is large, electrons can be transmitted in a planar network formed by V-V bonds, and the electron transfer efficiency is improved. And the problem that the deintercalation of alkali metal with larger ion radius cannot be realized due to smaller interlayer spacing of the existing graphite negative electrode material can be effectively solved.

The invention provides a vanadium disulfide and vanadium tetrasulfide nanometer material with a lamellar self-assembly structure, a preparation method thereof and a rechargeable battery with excellent rate capability, firstly, rose-shaped VS2 nanosheets are prepared from raw materials with low price, and a VS2 and VS4 lamellar self-assembly structure nanometer material is obtained through a secondary hydrothermal method; the lamellar self-assembly structure VS2 (at) VS4 is a nanometer material with the thickness of a single layer of 100-400 nm, and the lamellar self-assembly structure VS2 (at) VS4 nanometer material is safe, environmentally friendly and low in price. According to the present invention, the product sheet layer self-assembly structure VS2atVS4 nanometer material provides more active sites during the charge-discharge process, the sheet layer structure has a large specific surface area, the formed three-dimensional laminated structure effectively solves the problem of large material volume change during the charge-discharge process, and the cycle capacity, the stability and the coulombic efficiency of the battery are improved;

The invention belongs to the technical field of electrode material preparation, and particularly relates to a vanadium disulfide and black phosphorus composite electrode material and a preparation method thereof. The method comprises the steps: firstly, stripping black phosphorus; secondly, stripping the vanadium disulfide; and finally, compounding vanadium disulfide and black phosphorus to obtainthe vanadium disulfide and black phosphorus composite electrode material. The material has the characteristics of high specific surface area, high active sites and high specific capacity; and the pores between the nanosheet layers can buffer the volume change of the active material in the charging and discharging process, can increase the contact area with the electrolyte, reduces the ion transmission path, and is beneficial to the rapid transfer of electrons/ions, thereby improving the cycling stability and rate capability of the electrode material.