26results about How to "Small volume change" patented technology

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 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 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 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 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.

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 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 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.

The application relates to the technical field of lithium ion batteries, in particular to a high-entropy high-nickel cobalt-free precursor, a high-entropy high-nickel cobalt-free single-crystal positive electrode material and a preparation method thereof and a lithium ion battery. The high-entropy high-nickel cobalt-free precursor comprises a core layer and a high-entropy doped shell layer coated on at least part of the surface of the core layer; the core layer comprises a first nickel-manganese hydroxide; the high-entropy doped shell layer comprises a high-entropy doped second nickel-manganese hydroxide; and the doped elements in the high-entropy doped second nickel-manganese hydroxide include titanium, magnesium, aluminum, zirconium and molybdenum. The high-entropy high-nickel cobalt-free precursor provided by the application is coated with a high-entropy doped shell layer containing titanium, magnesium, aluminum, zirconium and molybdenum on the surface of the core layer containing the first nickel-manganese hydroxide, which is beneficial to reducing the exposure degree of {010} active crystal faces in the precursor, promoting the preferred growth of the positive electrode material along the (003) plane, and further improving the electrochemical performance and cycle stability of the high-entropy high-nickel cobalt-free single-crystal positive electrode material.

The invention belongs to the technical field of secondary batteries. More specifically, the invention relates to a negative plate and a preparation method thereof, and a battery cell. The negative plate comprises a current collector, the current collector comprises a first surface and a second surface which are opposite to each other; the first surface and the second surface are respectively provided with a negative active material coating; the negative active material coating comprises a bottom active material layer close to the current collector and a surface active material layer far away from the current collector; a conductive agent in the bottom active material layer is Super P; a conductive agent in the surface active material layer is carbon nanotubes and graphene; the content of the conductive agent in the bottom active material layer is 1.2-2.0%; and the content of the conductive agent in the surface active material layer is 1.8-3.0%. The thickness ratio of the bottom active material layer to the surface active material layer is (0.8-0.9): 1.

The utility model discloses a lithium ion battery cathode material powder pressure boosting system, which relates to the technical field of cathode material processing and sequentially comprises a feeding device, two heating devices and a cooling device. The feeding device comprises a feeding bin, a cyclone separator and a first Roots blower, a first weighing module, an airflow arch breaking device and a first drawer type iron remover are arranged in the feeding bin from top to bottom, and the bottom of the feeding bin is connected with the cyclone separator through a conveying pipeline; a first pulse dust collector, a second weighing module, a third level gage and a first jacking arch breaking device are arranged in the cyclone separator from top to bottom, and the first Roots blower is connected with the cyclone separator through a first blower pipeline; the heating device sequentially comprises a heating feeding pipeline, a heating feeding spiral device, a heating kiln and a heating discharging pipeline, and the bottom of the cyclone separator is connected with the heating feeding pipeline of the corresponding heating device. According to the scheme, efficient powder pressing and lifting of the negative electrode material can be achieved, and the product quality is guaranteed.

The application relates to a preparation method of an ultra-high-temperature fluid loss additive for well cementing, and belongs to the technical field of oilfield chemicals. After surface modification of palygorskite by a silane coupling agent, the surface polymerization sites of the palygorskite are obtained, so as to participate in a polymerization reaction. N,N-dimethyl acrylamide and other non-ionic water-soluble monomers, 2-acrylamide-2-methylpropanesulfonic acid, itaconic acid, sodium styrene sulfonate and other anionic water-soluble monomers, and vinyl pyrrolidone, sodium p-styrene sulfonate and other rigid monomers are used as polymerization raw materials to synthesize polymer grafted palygorskite. The fluid loss additive has excellent temperature resistance and salt resistance, has excellent fluid loss performance in a high-temperature and ultra-high-temperature environment, the fluid loss amount is less than 50 mL at 240 DEG C, has no obvious influence on other basic performances of cement slurry, can effectively improve the suspension stability of the cement slurry at high temperature, and is suitable for being used as a fluid loss additive for cement slurry under harsh conditions.

This invention relates to the field of all-solid-state secondary battery technology and discloses a high-performance all-solid-state secondary battery equipped with a stabilized positive electrode, comprising a positive electrode, a negative electrode layer, and a solid electrolyte layer. The positive electrode is manufactured by coating and drying a slurry containing 80%-88% positive electrode active material, 10%-16% sulfide solid electrolyte, 1%-2% conductive agent, and 1%-2% binder, followed by a heat-pressurization treatment at 100℃-250℃ and 10MPa-100MPa. This invention constructs a dense interface stabilization layer in situ between the positive electrode active material and the sulfide electrolyte by applying a thermo-pressure coupling treatment to the positive electrode precursor. This stabilization layer improves the physical contact between the solid and solid interfaces and reduces interfacial impedance. Simultaneously, this stabilization layer acts as a physical barrier, inhibiting the oxidative decomposition of the electrolyte under high voltage, slowing capacity decay, and improving the battery's cycle life and structural stability.

The application discloses a low-strain silicon-carbon negative electrode material and a preparation method thereof. The preparation method comprises the following steps: S100, synthesizing MgV2O6 products from a magnesium source and a vanadium source; S200, mixing porous carbon and the MgV2O6 products to obtain a base material; and S300, performing vapor deposition on the outer surface and the pores of the base material by using a silane gas source and a carbon gas source in an inert gas to obtain a silicon-carbon negative electrode material. The MgV2O6 with a stable crystal structure is prepared from the magnesium source and the vanadium source, and rigid support is provided in the subsequent preparation process, so that the use stability and the thermal stability are improved. The silane gas source and the carbon gas source are vapor-deposited on the base material to generate silicon-carbon active substances in situ, so that the silicon atoms, the carbon atoms and the carbon atoms on the surface of the base material form firm chemical bonds, the stress generated when the silicon expands is absorbed by the internal structure of the silicon-carbon negative electrode material, and thus the silicon-carbon negative electrode material with high use stability is prepared.

The invention relates to the field of sodium ion batteries, and discloses a preparation method and application of an additive induced coordination compound derived Bi nitrogen-doped carbon composite material. The preparation method comprises the following steps: chelating an organic ligand with Bi ions in bismuth salt through a mechanochemical method to obtain a precursor Bi-HMT; subsequently, mixing and grinding the precursor and an additive to obtain an intermediate product, and performing high-temperature pyrolysis and carbon thermal reduction on the intermediate product to obtain a final product Bi nitrogen-doped carbon composite material. When the material is used as a sodium ion battery negative electrode, a nitrogen-doped carbon skeleton generated based on in-situ conversion of a coordination compound and an additive can be tightly combined with Bi particles, agglomeration among the Bi particles is avoided, volume change caused by intercalation and deintercalation of sodium ions is effectively relieved, heteroatom nitrogen is introduced through an organic ligand to modify the carbon skeleton, and the specific surface area of the material is increased. The chemical affinity of the material is improved, the overall conductivity of the composite material is improved, and the cycling stability and the rate capability of the material are enhanced.

The application provides an electric core, a battery pack and an energy storage device. The electric core comprises a shell, an end cover, a winding core and an explosion-proof valve. The end cover is sealed at an opening of the shell. The winding core is arranged in the shell. The explosion-proof valve is integrated on the end cover. The electric core further comprises a current collector. The current collector is electrically connected to each tab of the winding core. The end cover is formed with a channel. The channel communicates the explosion-proof valve and the winding core through an internal space of the shell. The current collector is disc-shaped and is configured to separate the channel. A plurality of through holes are formed on the current collector. The through holes are configured to allow gas to pass through and block solid particles. The electric core, the battery pack and the energy storage device provided by the application can filter the ejected solid particles while maintaining the volume of the electric core.

The invention relates to the technical field of batteries, and discloses a modified high-nickel positive electrode material and a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing a cobalt salt, an organic ligand and a solvent to obtain an MOF precursor solution; (2) dispersing a high-nickel positive electrode material in the MOF precursor solution for reaction to obtain an intermediate product; and (3) carrying out solid-phase mixing on the intermediate product and a sulfur source, and carrying out heat treatment to obtain the modified high-nickel positive electrode material, the modified high-nickel positive electrode material comprises a high-nickel positive electrode material and a composite coating layer, wherein the composite coating layer comprises cobalt sulfide and a carbon material. According to the preparation method provided by the invention, the MOF material is grown in situ on the high-nickel positive electrode material, and then the sulfur source is used for vulcanization, so that the uniform and compact composite coating layer which is firmly combined with the matrix on the nanoscale is formed on the surface of the positive electrode material, the interface stability, the thermal stability and the conductivity of the material are improved, and the electrochemical performance of the battery material is further improved.