47results about How to "Small volume change" patented technology

The invention relates to the technical field of electronic ceramic materials, and particularly discloses a microwave dielectric ceramic material and a preparation method thereof.The microwave dielectric ceramic material is prepared from, by mass, 75-95 parts of a first main material, 0-18.4 parts of a second main material, 0.03-3.9 parts of B2O3 and 0-13.5 parts of other components, and the first main material is SiO2. When the mass ratio of the B2O3 to the SiO2 is within a specific range, the crystal phase of the SiO2 can be stably converted into a quartz crystal phase, so that the cracking possibility of the microwave dielectric ceramic material is effectively reduced.

The invention relates to the technical field of electrode materials, in particular to a composite silicon negative electrode material suitable for a sulfide-based all-solid-state battery and a preparation method and application thereof, and the preparation method comprises the following steps: (1) generating a metal organic framework material on the surface of a nano silicon material through an in-situ growth method; (2) carbonizing the metal organic framework material on the surface of the nano silicon material through calcination treatment to form a nitrogen-doped porous carbon material, so as to obtain a Si-NC material; and (3) generating a sulfide solid electrolyte on the surface of the Si-NC material through an in-situ growth method to obtain the Si-NC-SE composite silicon negative electrode material. According to the invention, the surface of the Si material is coated with the nitrogen-doped porous carbon material (NC) through an in-situ generation technology, and the sulfide solid electrolyte is generated in situ, so that the conductivity of the composite silicon negative electrode material and the cycling stability of the sulfide-based all-solid-state battery adopting the composite silicon negative electrode material are improved.

This invention discloses a method for preparing interface-reinforced niobium pentoxide / porous graphene and its energy storage application. The method involves adding porous graphene oxide during the solvothermal synthesis of a niobium pentoxide precursor to obtain a composite precursor of niobium pentoxide and porous graphene oxide. This precursor is then annealed under a protective atmosphere to obtain the interface-reinforced niobium pentoxide / porous graphene composite material. The composite material obtained by this invention exhibits excellent performance as an electrochemical energy storage material. Furthermore, the preparation method of this invention is simple to operate, requires no complex equipment, and is easily controlled, making it suitable for mass production.

The invention provides a double-carbon-layer-coated silicon-carbon negative electrode material and a preparation method and application thereof.According to the method, a nano silicon material can be preliminarily and uniformly coated with an amorphous carbon precursor material to form an inner carbon layer by means of a spray drying method; the preparation method comprises the following steps: preparing a nanometer silicon material, uniformly coating asphalt by using a liquid phase coating method to form an outer carbon layer so that the surface of the nanometer silicon material is uniformly coated with a double-carbon-layer material, carbonizing the nanometer silicon material coated with the double-carbon-layer material in inert gas by stages, gradually removing volatile substances from the double-carbon-layer material by gradually increasing the carbonization temperature, and preparing the nanometer silicon material with the double-carbon-layer material. And finally, the silicon-carbon negative electrode material with the double-carbon-layer-coated micro-nano spherical structure is obtained, and the double-carbon-layer-coated silicon-carbon negative electrode material shows excellent performance in the aspects of initial capacity, reversible capacity and residual capacity retention rate after circulation.

The invention relates to a synthesis method and application of a double-layer thermochromic deformation hydrogel, according to the double-layer thermochromic deformation hydrogel, CMC is adopted to perform mechanical enhancement on original PNIPAm, LAP is adopted to perform photo-initiation on a monomer, and the price of CMC and LAP is far lower than that of functionalized silicon dioxide nanoparticles and AIBA in the prior art under the same usage amount. Meanwhile, drugs used in the process are free of volatility and corrosivity, and the safety degree is higher than that of acrylic monomers used in the prior art. Besides, the use temperature of a hydrogel device in the prior art is 60 DEG C and is high, while the double-layer temperature-sensitive hydrogel in the invention can be curled only at 40 DEG C, so that the hydrogel has more advantages in temperature. By adding CMC, the volume change of the hydrogel in the heating process is remarkably reduced, meanwhile, the mechanical property of the hydrogel is greatly improved, the mechanical property of the hydrogel is further improved through impregnation of zirconium ions, and the hydrogel has a wider application scene.

The invention discloses a tube nest type paraffin heat storage device, and relates to the technical field of heat storage devices, the tube nest type paraffin heat storage device comprises an outer shell, a mounting shell and a plurality of groups of tube nest assemblies, each tube nest assembly comprises a fixing frame, a plurality of heat storage tubes and tube hoops used for fixing the heat storage tubes, and each heat storage tube comprises a tube body, a heat storage medium and a heat exchange promoting mechanism. The heat exchange promoting mechanism is arranged in the pipe body and used for removing solid paraffin solidified on the inner wall of the pipe body in the heat release process and pushing the solid paraffin towards the inner wall of the pipe body in the heat absorption process so as to promote heat exchange. The heat exchange promoting mechanism is arranged in the heat storage pipe, solid paraffin solidified on the inner wall of the pipe body can be effectively removed in the heat release stage, heat resistance is reduced, it is ensured that heat is smoothly transmitted to liquid paraffin, and heat release is completed; and the contact area between the paraffin and the pipe wall is increased, and efficient absorption of heat is promoted.

The invention discloses a nitrogen-doped carbon / V2O3 integrated hierarchical pore composite energy storage material and a preparation method thereof, and belongs to the technical field of energy storage materials. According to the method, NaCl is adopted as a template agent, ammonium metavanadate, urea and carboxymethyl cellulose are adopted as raw materials to prepare a mixture sol, and the sol is changed into xerogel through a freeze-drying technology. And then preparing the nitrogen-doped carbon / V2O3 integrated hierarchical porous composite material in situ by adopting a one-step simple thermal decomposition and thermal reduction strategy. The composite material prepared by the invention is composed of nitrogen-doped carbon and V2O3 without obvious morphology, and presents an integrated three-dimensional hierarchical pore structure. The pore diameter of the internal micropores is 0.6-3.5 nm; the aperture of the mesopores is 5.3 to 20 nm; and the specific surface area is 208-999 m < 2 > g <-1 >. Excellent electrochemical performance is shown in the storage process of sodium ions and potassium ions. The hierarchical porous composite energy storage material prepared by the method is high in universality, simple to operate, low in cost, high in yield and suitable for industrial production.

The application provides a flaky flower-like single-crystal sodium vanadium oxyfluorophosphate / carbon composite material, a preparation method thereof and a sodium ion battery. The flaky flower-like single-crystal sodium vanadium oxyfluorophosphate material is prepared through a hydrothermal reaction. A surfactant is used to control the crystal face growth direction in the material synthesis process, so that the sodium vanadium oxyfluorophosphate grows to form a flaky flower-like single-crystal structure, and then the ion transmission distance is shortened, the ion kinetic characteristics of the material can be effectively improved, and on the basis of ensuring the structural stability of the material, that is, the cycle performance, the rate characteristics of the material are effectively improved. Through carbon coating, the electronic conductivity of the surface of the material particles is improved, and the capacity rate performance of the material is effectively improved.

The invention provides an aqueous cadmium ion-vanadium dioxide battery as well as a preparation method and application thereof, and relates to the field of ocean energy storage. The battery comprises a negative electrode, a positive electrode, a diaphragm and an aqueous electrolyte, the negative electrode is metal cadmium or cadmium-based alloy; the active material of the positive electrode is metastable monoclinic phase vanadium dioxide; the diaphragm is a glass fiber diaphragm; the aqueous electrolyte is an aqueous solution containing cadmium salt; the total concentration of the cadmium salt in the aqueous electrolyte is 1-4 mol / L. The aqueous vanadium dioxide-cadmium metal secondary battery disclosed by the invention has the advantages of safe aqueous electrolyte system, high rate capability, ultra-long cycle life and the like, and has remarkable advantages when being applied to ocean energy storage.

This invention provides a silicon-based anode composite material, its preparation method, and its application. The silicon-based anode composite material comprises a silicon-based core, a boronoxy lattice stabilizer, and an inert material. At least a portion of the boronoxy lattice stabilizer is embedded in the lattice structure of the silicon-based core, and the inert material coats the surface of the silicon-based core. This invention helps improve the initial coulombic efficiency and cycle performance of the silicon-based anode composite material.

This invention relates to the field of solid-state electrolyte battery technology, specifically to a 4D-printed gel solid-state electrolyte, a printing method, and a solid-state battery. This application utilizes 3D printing technology to pre-construct a solid-state electrolyte composed of an insoluble polymer framework and a soluble polymer functional phase. When a trace amount of electrolyte is introduced, this structure undergoes a predetermined, controllable evolution over time—the soluble components rapidly dissolve and gel in situ, dynamically coating the surface and pores of the insoluble framework, thereby forming a gel electrolyte that combines a stable three-dimensional framework with a high ionic conductivity gel interface layer. This achieves a 4D-printed gel solid-state electrolyte. This 4D-printed gel solid-state electrolyte effectively buffers volume changes and significantly reduces interfacial impedance. Simultaneously, its insoluble framework ensures mechanical strength and dimensional stability, while the extremely low electrolyte usage fundamentally improves battery safety and cycle performance.

The invention belongs to the technical field of lithium ion battery negative electrode materials, and particularly relates to a nanometer silicon inlaid silicon monoxide / carbon composite negative electrode material and a preparation method thereof. The preparation method comprises the following steps: by taking hydrophobic nano silicon dioxide and asphalt as main raw materials, dissolving the asphalt in carbon tetrachloride, mixing the nano silicon dioxide with an asphalt solution, and carrying out heat treatment to prepare carbon-coated silicon dioxide powder; mixing the carbon-coated silicon dioxide powder with aluminum powder, potassium chloride and anhydrous aluminum chloride, and reducing to obtain carbon-coated nano silicon inlaid silicon monoxide powder; mixing the carbon-coated nano-silicon inlaid silicon monoxide with the asphalt carbonization product, and carrying out ball milling; and mixing the ball-milled product with asphalt, styrene and imidazoline, carrying out ball milling in a carbon tetrachloride medium, and carrying out heat treatment on the ball-milled product to prepare the nano silicon inlaid silicon monoxide / carbon composite negative electrode material. The method disclosed by the invention is simple in process, relatively low in cost, environment-friendly and easy to realize large-scale production, and the prepared negative electrode material has excellent electrochemical performance.

The present invention discloses a molded case circuit breaker, comprising a shell, a cavity inside the shell, at least three contact assemblies and an operating mechanism arranged in sequence in the cavity, the operating mechanism is connected to an operating handle, the operating mechanism is correspondingly arranged above the contact assembly located in the middle position, the two ends of the shell are provided with wiring terminals, the inside of the cavity is provided with two circuit board installation cavities at the two sides corresponding to the operating mechanism, the two circuit board installation cavities are respectively correspondingly arranged above the other two contact assemblies, one end of the shell is provided with a mounting groove, the mounting groove is correspondingly arranged above the wiring terminal and is simultaneously located at the same side position of the two circuit board installation cavities, and a connection assembly that is conductively plugged in with a wireless communication module is arranged in the mounting groove. The internal structure layout of the present invention is more reasonable and compact, and it is convenient for the disassembly, assembly and replacement of the wireless communication module.

The invention relates to the technical field of batteries, in particular to an integrated lithium metal negative electrode and a preparation method thereof, a lithium metal battery and a power utilization device, and the integrated lithium metal negative electrode comprises a porous polymer film, a conductive polymer layer, a lithium-loving substance layer and a lithium metal layer which are sequentially stacked in the thickness direction; materials of the conductive polymer layer comprise a fluorine-containing polymer, a conductive agent and a lithium supplement agent. The integrated lithium metal negative electrode is provided, and the high-stability lithium metal battery is constructed through multi-stage protection of physical blocking, stress buffering and lithium deposition induction.

The invention relates to the technical field of batteries, in particular to a graphite composite material and a preparation method and application thereof. The graphite composite material comprises a base material layer and a coating layer, and the coating layer comprises a first material layer and a second material layer; the base material layer comprises graphite; the first material layer comprises an amorphous carbon material, and the amorphous carbon material is doped with a first nitrogen element; the second material layer comprises a graphite material, and the graphite material has a porous structure and is doped with a second nitrogen element; the concentration of the first nitrogen element is greater than that of the second nitrogen element. According to the graphite composite material, the first material layer can ensure the reversible capacity and the rate capability of the material; the graphitization degree of the carbon material in the second material layer is high, the irreversible capacity can be reduced, the low nitrogen concentration is beneficial to improving the conductivity, and the porous structure can shorten an ion diffusion channel, so that the energy storage capacity and the rate capability are improved.

The invention discloses a metal zinc negative electrode with a PDMS (at) MOF composite coating and a preparation method of the metal zinc negative electrode, and belongs to the technical field of aqueous zinc ion batteries. According to the technical scheme, the negative electrode comprises a metal zinc negative electrode and a PDMS (at) MOF composite coating arranged on the surface of the metal zinc negative electrode; the PDMS (at) MOF composite coating is of a composite structure formed by infiltrating and coating PDMS on the surface and pores of a metal organic framework (MOF). The negative electrode has the beneficial effects that the PDMS (at) MOF composite structure coating is constructed to synergistically inhibit zinc dendritic crystal growth and side reaction, so that the cycle life and the stability of the battery are remarkably improved.

This invention provides a server liquid cooling pump, which has the advantages of self-heating using liquid medium, high pump reliability and long service life, self-balancing pump chamber pressure difference, and near-zero leakage risk. Its structure includes a pump casing, a stator-rotor assembly, and an impeller. The stator-rotor assembly is installed inside the pump casing and drives the impeller to rotate, causing the liquid medium to flow within the flow channel. A cooling channel is also provided inside the pump casing, communicating with the flow channel. The liquid medium can enter the cooling channel and immerse the stator-rotor assembly in the liquid medium, thereby dissipating heat from the stator-rotor assembly.

The application discloses a silicon-carbon negative electrode material, a preparation method, application and a battery. The preparation method of the silicon-carbon negative electrode material comprises the following steps: performing methane gas phase carbon coating on a silicon source to obtain the silicon-carbon negative electrode material; wherein, when the methane gas phase carbon coating is performed, the vacuum degree of the system is 300-5000 Pa; and the mass-volume ratio of the silicon source and methane is 1 kg:(10-150) L. The uniformity and coverage of the coating layer on the surface of the silicon source of the silicon-carbon negative electrode material are better, the carbon deposition layer has a special surface structure, the volume change of the negative electrode material in the charging and discharging process can be buffered, and the negative electrode material can realize better electrochemical performance.

The present invention provides a layered oxide positive electrode material for inhibiting the slippage of a transition metal layer and a preparation method thereof. The layered oxide positive electrode material is composed of a plurality of heterovalent ions doped simultaneously in the sodium layer, transition metal layer and oxygen layer of a sodium ion layered oxide. In the present invention, heterovalent cations with large ionic radius in the sodium layer of the material can play a role in supporting the transition metal layer; lithium ions in the transition metal layer can reversibly migrate between layers; and fluorine ions in the oxygen layer can improve the reversibility of the oxygen reaction. Therefore, the introduction of a plurality of heterovalent ions reduces the electrostatic repulsion between sodium layers in the material, thereby inhibiting the slippage of the transition metal layer at the end of charging, effectively alleviating the structural phase change of the layered oxide positive electrode material during the charging and discharging process, and significantly improving the electrochemical cycle stability and rate performance of the sodium ion battery.

This invention discloses a high-stability sodium battery cathode and its preparation method, comprising 3-15% PEDOT:PSS, 5-8% carbon nanotubes, 3-12% fluororubber, 0.5-5% nano-alumina, and the balance being cathode active material. The preparation method includes the following steps: S1. Carbon nanotubes and PEDOT:PSS are added sequentially to NMP and mixed to obtain a first dispersion; fluororubber powder is added to NMP at 80-100°C and dissolved to obtain a second dispersion; S2. The cathode active material and the first dispersion are mixed, then the second dispersion is added, and finally nano-alumina is added to obtain a cathode slurry; S3. The cathode slurry is coated onto the surface of an aluminum foil and then rolled to obtain the high-stability sodium battery cathode.

The invention provides a ferric oxide coated hard carbon composite negative electrode material and a preparation method and application thereof, the composite negative electrode material comprises a core part and a shell which is coated on the surface of the core part and is less than 50nm in thickness, the core part is hard carbon particles, and the particle size of the hard carbon particles is less than 20mu m; the shell is composed of a plurality of ferric oxide particles formed through in-situ deposition, the average particle size of the ferric oxide particles is 6 nm, and the synergistic effect between ferric oxide and hard carbon particles is achieved. The thickness of the ferric oxide shell is very thin, the size of ferric oxide particles in the shell is small, and a void space is formed around any ferric oxide particle, so that the volume change of ferric oxide in the sodium charging and discharging process is buffered, and the cycling stability of ferric oxide is improved. And the hard carbon has high conductivity, and meanwhile, the hard carbon provides an adhesion substrate for the ferric oxide and has the effect of increasing the conductivity. Therefore, the composite negative electrode material has high specific capacity and relatively high cycling stability.

The invention discloses a lithium-containing multi-metal composite hydrocarbon derivative polymer coating, and discloses a preparation method of the lithium-containing multi-metal composite hydrocarbon derivative polymer coating. A metal organic thin film is formed on the surface of a positive electrode material through molecular layer deposition, the thin film contains a lithium element, the metal organic thin film is a hybrid thin film formed by a metal center and an organic ligand, and the invention further discloses application of the lithium-containing multi-metal composite hydrocarbon derivative polymer coating in a lithium battery positive electrode. The problems that in the prior art, a positive electrode material faces volume change and unstable interface side reaction in the circulation process, and the ionic conductivity of a polymer coating at the present stage is low are solved, so that the mechanical stability and the interface stability of the positive electrode material are improved, ion transmission at an electrode interface is promoted, and the positive electrode performance is improved.

The invention relates to the technical field of electrode materials, in particular to a hollow iron phosphide / carbon nanofiber and a preparation method and application thereof. The preparation method comprises the following steps: S1, dissolving ferric acetylacetonate, phenylphosphonic acid and polymethyl methacrylate in an organic solvent to obtain a core layer solution; dissolving polyacrylonitrile in an organic solvent to obtain a skin layer solution; s2, respectively filling an injector with the core layer solution and the skin layer solution prepared in the step S1, and preparing a coaxial nanofiber membrane by adopting a coaxial electrostatic spinning method and adopting a carbon-coated copper foil or aluminum foil as a current collector; s3, the coaxial nanofiber membrane is pre-oxidized and then carbonized, and the hollow iron phosphide / carbon nanofiber is obtained. The iron phosphide-based composite material is formed by loading iron phosphide onto the carbon nanofibers, so that the structural stability and the conductivity of the iron phosphide-based composite material are improved, the hollow carbon nanofibers are prepared, the specific surface area of the material is increased, the active sites of the material are increased, and the electrochemical performance of the material is further improved.

The main purpose of the present disclosure is to provide an electrode active material having little change in volume due to charge and discharge. In the present disclosure, the above problem is solved by providing an electrode active material having a silicon inclusion compound type II crystal phase, the crystallite size of the crystal phase being 125 nm or more and 215 nm or less.

The invention discloses a preparation method and low-temperature application of a Te-doped tungsten niobium oxide / molybdenum niobium oxide heterojunction, and belongs to the technical field of secondary batteries. The preparation method specifically comprises the following steps: carrying out high-energy ball milling and alloying on WO3, Nb2O5 and Te2O5 to obtain amorphous Te-doped tungsten niobium oxide; the preparation method comprises the following steps: carrying out high-energy ball milling and alloying on MoO3, Nb2O5 and Te2O5 to obtain amorphous Te doped molybdenum niobium oxide; uniformly mixing and compacting the amorphous Te doped tungsten niobium oxide and the amorphous Te doped molybdenum niobium oxide, and performing discharge plasma sintering in an inert atmosphere to obtain the ceramic crystal Te doped tungsten niobium oxide / molybdenum niobium oxide heterojunction material. The Te-doped tungsten niobium oxide / molybdenum niobium oxide two-phase heterojunction material designed by the invention is relatively short in synthesis time, the synthesis period is shortened, the size of crystal grains is convenient to regulate and control, the crystallinity of the material is very good, the diffusion rate of lithium ions is greatly promoted by a heterojunction interface, the electron conductivity is improved by cooperating with Te doping, and the performance of the Te-doped tungsten niobium oxide / molybdenum niobium oxide two-phase heterojunction material is improved. The material can be used as a lithium ion negative electrode material with fast charging characteristic and good low-temperature performance.

The present disclosure is an active material, a negative electrode layer, a battery, and a method for manufacturing the same. As a subject, the main purpose of the present disclosure is to provide an active material with a small volume change caused by charge and discharge. In the present disclosure, the subject is solved by providing the following active material, wherein the active material has a silicon inclusion compound II type crystalline phase, has voids inside the primary particles, and the void amount A of the voids with a pore diameter of less than 100 nm is greater than 0.15cc / g and less than 0.40cc / g.

The invention relates to the technical field of sodium secondary batteries, in particular to a composite current collector, a preparation method of the composite current collector and a negative-electrode-free sodium ion battery comprising the composite current collector. The composite current collector comprises a three-dimensional porous metal framework and artificial SEI layers arranged on at least one outer surface and the hole wall surface of the three-dimensional porous metal framework; and the artificial SEI layer comprises one or more of NaTi2 (PO4) 3, Na3Zr2Si2PO12, NaTaO3 or NaAlF4, and the SEI layer comprises one or more of NaTi2 (PO4) 3, Na3Zr2Si2PO12, NaTaO3 and NaAlF4. According to the present invention, the adjustable ultrathin artificial SEI layer is arranged on the outer surface and the pore wall surface of the three-dimensional metal porous skeleton, such that the problems of non-uniform sodium metal deposition, dendritic crystal growth and the like of the negative-electrode-free sodium ion battery are solved, and the cycle performance and the rate capability of the negative-electrode-free sodium ion battery are effectively improved.

A method for preparing a binary formula for Dai pottery clay and its application is disclosed. The method involves taking Dai pottery clay from the Honghe River basin, five-colored clay from Honghe County, and charcoal powder. The Dai pottery clay and five-colored clay are sun-dried and weathered for at least three months. The Dai pottery clay from the Honghe River basin has a SiO2 content of not less than 50%, an Al2O3 content of not less than 15%, an Fe2O3 content of not less than 10%, and a loss on ignition of less than 10%. The five-colored clay from Honghe County has a SiO2 content of 72-82%, an Al2O3 content of 9-12%, and an Fe2O3 content of 3-5%. The method involves soaking the Dai pottery clay and five-colored clay in water until fully saturated, then ball-milling them. The slurry is sieved, and then charcoal powder is added. After stirring evenly, the clay is pressed to drain water and then kneaded to remove air. This invention can improve the throwing and molding performance of Dai pottery clay, increase the sintering temperature and the density and strength of its structure, and reduce the burn-off rate.

The invention discloses a binder for a positive pole piece as well as a preparation method and application of the binder. The adhesive comprises a rigid framework component, a flexible link component and an interface anchoring component, and is a composite adhesive system with a three-dimensional network structure. The preparation method comprises the following steps: uniformly dispersing the rigid framework component in water, sequentially adding the flexible linking component and the interface anchoring component, and uniformly mixing to obtain the adhesive. The binder can be applied to the Prussian blue type positive pole piece, the Prussian blue type positive pole piece comprises a current collector and an active substance layer coated on at least one side surface of the current collector, and the active substance layer comprises a Prussian blue type positive pole material, a conductive agent and the binder. The binder provided by the invention solves the problems of low peeling strength, poor flexibility, easy layering during baking and the like of the Prussian blue positive pole piece, and the prepared positive pole piece has excellent mechanical properties and electrochemical properties, and is suitable for the field of sodium ion batteries.