39 results about "Vanadium disulfide" patented technology

The invention belongs to the technical field of electrode material preparation, and in particular relates to a composite electrode material of vanadium disulfide and black phosphorus and a preparation method thereof. Firstly, the black phosphorus is stripped; secondly, the vanadium disulfide is stripped; finally, the vanadium disulfide and the black phosphorus are compounded to obtain a composite electrode material of vanadium disulfide and black phosphorus. The material has the characteristics of high specific surface area, high active sites, and high specific capacity. The pores between the nanosheets can buffer the volume change of the active material during charging and discharging, and can increase the contact area with the electrolyte, reducing the The ion transport path is opened, which is conducive to the rapid transfer of electrons / ions, thereby improving the cycle stability and rate performance of the electrode material.

The invention relates to the technical field of battery materials, in particular to a sulfur / vanadium disulfide / MXene composite material and a preparation method and application thereof. In the preparation method disclosed in the present invention, the high specific surface area and a large number of active sites of the sulfur-loading material MXene can increase the loading capacity of sulfur; MXene has unique flexibility and good conductivity, so it can buffer the volume change of the positive electrode material And improve the conductivity of the composite material; MXene surface has a large number of functional groups and static electricity can attract vanadate ions and then undergo coordination, so that vanadate ions are evenly adsorbed on the surface of MXene, and the vanadate ions and sulfur source are formed at an appropriate temperature Uniform vanadium disulfide nanosheets are generated in situ on the surface of MXene, and the introduction of catalytically active and conductive vanadium disulfide nanosheets into MXene can chemically adsorb lithium polysulfide, and can quickly convert it into electrolyte in the electrolyte. Insoluble Li 2 S 2 / Li 2 S, thereby inhibiting the severe shuttle effect and improving the stability and cycle life of lithium-sulfur batteries.

The invention provides a vanadium disulfide nanosheet coated with oxo-vanadium hydroxide and a preparation method and application thereof. The preparation method comprises the following steps: dissolving sodium metavanadate and thioacetamide in deionized water in a magnetic stirring state simultaneously; then, pouring the solution into a reaction lining for sealing, loading the lining into an outer kettle for fixing, and placing the outer kettle into a homogeneous phase reaction instrument; lastly, cooling a reaction product, washing, collecting and drying to obtain the VOOH-coated VS2 nanosheet. The VOOH-coated VS2 nanosheet prepared by the method has uniform chemical composition, higher purity, uniform appearance and a specific self-assembly structure, and shows superior electrochemical performance when being taken as a sodium-ion battery electrode material. Moreover, by adopting the method, the defect of high temperature in a conventional calcining method is overcome, and large-sized equipment and severe reaction conditions are not needed; the vanadium disulfide nanosheet has the advantages of adoption of cheap and readily-available raw materials, low cost, high yield, no need of posttreatment and environmental friendliness, and can be suitable for large-scale production.

The invention provides a three-dimensional porous graphene-vanadium disulfide composite electrode material, and a preparation method and an application thereof. The composite electrode material comprises porous graphene oxide and vanadium disulfide coated with porous graphene oxide. The composite electrode material adopts porous graphene oxide for coating vanadium disulfide, and porous graphene oxide provides more ionic channels and larger specific surface area, so that ion storage and transportation can be performed conveniently; by virtue of porous graphene oxide, electrical conductivity ofvanadium disulfide can be improved, so that the problems of volume expansion and phase change of vanadium disulfide in the charging-discharging processes can be suppressed; meanwhile, vanadium disulfide can provide pseudocapacitance, so that relatively high specific capacity and rate performance can be realized; the composite electrode material shows high capacitance characteristic in a supercapacitor; and by virtue of the three-dimensional macro body of the composite electrode material, stability of the composite material can be obviously reinforced.

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.