402 results about "Composite electrolyte" patented technology

The invention relates to a composite solid electrolyte membrane with high ceramic content and a preparation method and application thereof. The preparation method comprises the following steps: mixing ceramic solid electrolyte particles activated by a silane coupling agent with an in-situ polymerization solution containing a cross-linking agent, an organic monomer, a plasticizer, a lithium salt, an ultraviolet light initiator and a thermal initiator to form solid electrolyte slurry, wherein the ceramic solid electrolyte particles account for 60-90% of the total mass of the composite solid electrolyte membrane; the preparation method comprises the following steps: coating a positive pole piece with solid electrolyte slurry, initiating shallow organic matter monomers and a cross-linking agent to generate in-situ polymerization through an ultraviolet light initiator, covering a negative pole piece for hot pressing treatment, initiating residual organic matter monomers and the cross-linking agent to generate in-situ polymerization through a thermal initiator, and forming a composite electrolyte membrane with high ceramic content. The invention also discloses an all-solid-state battery containing the composite solid electrolyte membrane. The solid-state battery containing the in-situ formed composite solid-state electrolyte membrane has relatively high cycling stability.

The invention provides an aerogel reinforced composite electrolyte thin film for a solid-state lithium battery and a preparation method of the aerogel reinforced composite electrolyte thin film, and belongs to the technical field of composite electrolytes.The thin film comprises a three-dimensional porous aerogel skeleton, a solid-state electrolyte compound and lithium salt nanocrystals; wherein the three-dimensional porous aerogel skeleton is prepared from inorganic oxide nanoparticles and a polymer precursor through a sol-gel method; pores of the three-dimensional porous aerogel skeleton are filled with the solid electrolyte compound, the solid electrolyte compound comprises lithium lanthanum zirconium oxide nanowires and a polyoxyethylene-lithium salt composite matrix, and the lithium lanthanum zirconium oxide nanowires are directionally arranged in the thickness direction of the film; the lithium salt nanocrystals grow on the surface of the pore wall of the three-dimensional porous aerogel in situ; the mass ratio of the aerogel skeleton to the solid electrolyte compound is (1: 3)-(1: 15). According to the thin film, the ionic conductivity, the mechanical strength and the interface stability of the electrolyte are remarkably improved.

The invention discloses a high-modulus leather / eutectic gel composite electrolyte and a preparation method and application thereof, and belongs to the technical field of energy storage. The preparation method comprises the following steps: 1) preparing a eutectic gel solution containing polyvinyl alcohol, zinc salt, small molecular polyol and water; 2) carrying out vacuum impregnation to obtain leather fibers containing a eutectic gel solution; and (3) obtaining the leather / eutectic gel composite electrolyte with the imitated reinforcing steel bar-concrete structure through freeze-thaw circulation.The composite electrolyte effectively solves the problem that an existing gel electrolyte is low in modulus and difficult to effectively deal with extreme mechanical deformation, and the cycle life of the water-based zinc ion battery is remarkably prolonged.

The invention relates to a surface-coated oxide solid electrolyte and a preparation method thereof, the surface-coated oxide solid electrolyte comprises an oxide electrolyte and a surface coating layer, the chemical formula of the oxide solid electrolyte is Li7-xLa3Zr2MxO12-x (M = Ta, Nb, Hf, Ge, Sc, Ti, Al, Si, Sn, Y, 0 < = x < = 1), the chemical formula of the surface coating layer is LiXON (R = Ta, Nb, Al, Zr, Ga, In, N = F, Cl, Br, I), and a lithium source, a lanthanum source, a zirconium source, an M source, an X source and an N source, or an XN source are connected in series, garnet solid electrolyte powder with a stable surface coating layer is obtained by adopting a solid phase method or a sol-gel method and combining a low-temperature calcination process; and then mixing and reacting with a lithium salt and a polymer electrolyte, and pouring the obtained slurry on a polyfluortetraethylene plate to prepare the composite electrolyte. Compared with the prior art, the high-ion conductor layer formed on the surface of the product in situ constructs a rapid transmission channel for lithium ion transmission in the composite electrolyte, and high ion conductivity is achieved.

The invention discloses a preparation method of a solid-state polymer composite electrolyte material and application of the solid-state polymer composite electrolyte material in an all-solid-state battery, and relates to the technical field of all-solid-state lithium ion batteries, and the preparation method comprises the following steps: firstly synthesizing a skeleton filler, adding an acid solution, and then carrying out ultrasonic treatment, soaking, centrifuging and washing to obtain an acid-modified skeleton filler; dispersing the acid-modified skeleton filler in an organic solution, adding a lithium salt, stirring, centrifuging, and washing to obtain a lithiated skeleton filler; weighing an electrolyte salt, adding the electrolyte salt into the polymer precursor, adding the lithiated skeleton filler, uniformly mixing, and drying to obtain a dried product; and finally, rolling the dried product into a thin film to obtain the solid polymer composite electrolyte thin film. According to the preparation method of the solid polymer composite electrolyte material, the ionic conductivity and Li < + > transference number of a solid polymer composite electrolyte thin film prepared by inducing polymer precursor polymerization through cations and compounding the inorganic filler at normal temperature are superior to those of a commercial PP film and a poly N, N-dimethylacrylamide film.

The invention relates to the technical field of sodium ion batteries, and discloses a low-overpotential uniform sodium deposition composite electrolyte and a preparation method of a sodium metal battery, the composite electrolyte comprises a sodium salt, a solvent, a film-forming additive and a sodium deposition regulating agent; the film forming additive is selected from at least one of NaPO2F2, NaDFOB and Na2SO3; the sodium deposition regulating agent is selected from at least one of CsTFSI, SnCl2 and Bi (OTf) 3. Through the synergistic effect of the film-forming additive and the sodium deposition regulating agent, a stable and firm SEI film can be formed on the interface of the negative electrode current collector, the overpotential of sodium deposition is obviously reduced to 20 mV or below, the growth of sodium dendrites is effectively inhibited, and dense and uniform deposition of sodium is realized. The negative-electrode-free sodium metal battery based on the composite electrolyte shows high first efficiency (greater than or equal to 90%), high coulombic efficiency (greater than 99.5%) and excellent cycling stability, and an effective scheme is provided for solving the core challenge of a sodium metal negative electrode.

The invention discloses a wide-temperature-range high-rate semi-solid lithium iron phosphate battery and a preparation method thereof, and belongs to the technical field of batteries, the wide-temperature-range high-rate semi-solid lithium iron phosphate battery comprises a positive electrode material, a negative electrode material, a diaphragm and an electrolyte; the positive electrode material comprises a positive electrode active material, a first conductive agent, a positive electrode binder and a graphene-coated aluminum foil current collector; the negative electrode material comprises a negative electrode active substance, a second conductive agent, a negative electrode binder and a graphene-coated aluminum foil current collector; the diaphragm is a single-side-coated ceramic diaphragm; the electrolyte comprises an organic solvent, a composite electrolyte and a composite additive. The positive electrode material adopts an active substance composed of lithium-aluminum-titanium-phosphorus and lithium iron phosphate, the active substance and the lithium iron phosphate have a synergistic effect, and are matched with the first conductive agent conductive carbon black, the positive electrode binder and the graphene-coated aluminum foil current collector, so that the stability of a positive electrode interface can be enhanced, and the lithium-aluminum-titanium-phosphorus lithium-iron-phosphate battery can be effectively improved at different temperatures. Especially at high temperature, the electrolyte solvent can be inhibited from oxygenolysis on the surface of the positive electrode, and generation of corrosive gas and loss of active substances are reduced.

The invention discloses a preparation method of a poly (1, 3-dioxolame)-based composite electrolyte, and belongs to the technical field of sodium ion batteries. The preparation method comprises the following steps: adding a sodium salt and a 1, 3-dioxolame monomer into a solvent, then mixing with an additive to obtain a precursor, and carrying out standing and polymerization curing treatment to obtain the poly (1, 3-dioxolame)-based composite electrolyte. According to the invention, the polymerization curing time of the precursor is greatly shortened by optimizing a solvent system; the additive is introduced into the precursor, the additive comprises a cross-linking agent and / or an inorganic filler, the cross-linking agent is trimethylolpropane triglycidyl ether, and the inorganic filler is NASICON type solid electrolyte powder, so that the ionic conductivity of the poly (1, 3-dioxolame)-based composite electrolyte is effectively improved, and the service life of the poly (1, 3-dioxolame)-based composite electrolyte is prolonged. And the cycling stability and the first-cycle discharge specific capacity of the assembled battery are remarkably improved.

The invention relates to a high-voltage polyoxyethylene (PEO)-based solid electrolyte and a preparation method thereof, and belongs to the technical field of solid-state battery materials. The electrolyte is composed of a polymer substrate, an inorganic filler, a cosolvent and a lithium salt, the polymer substrate is a PEO-polyacrylonitrile (PAN) composite substrate; the inorganic filler is lithium titanium aluminum phosphate LATP, and the cosolvent is fluoroethylene carbonate FEC; the lithium salt is lithium bis (trifluoromethanesulfonic acid) imide LiTFSI and lithium difluoro (oxalato) borate LiDFOB; the dispersing agent is acetonitrile ACN. The method has the advantages that PEO and FEC are complexed to form a new structure, and room-temperature efficient operation of a single-salt (LiTFSI) system is realized; and meanwhile, LiDFOB is cooperatively introduced to construct a stable passivation layer on a positive electrode interface, FEC synchronously induces to generate LiF-rich stable SEI on a lithium negative electrode, and the interface compatibility and electrochemical stability of the electrolyte to a high-voltage electrode are remarkably improved.

The invention discloses a composite solid positive electrode, a battery cell, a single battery and electric equipment. The positive electrode is composed of a current collector, a positive active material, an electronic conductive agent, a solid electrolyte and an interface modifier. Wherein the positive active material is used for providing a lithium source; the electronic conductive agent is used for reducing ohmic internal resistance and polarization; the solid electrolyte is used for transmitting ions, and the interface modifier is used for further reducing internal resistance and polarization. When the solid electrolyte is a composite electrolyte of sulfide and a polymer, the infiltration problem of a solid-solid interface and the deformation problem caused by charging and discharging can be solved due to the existence of the interface modifier. The positive electrode material can be applied to battery systems such as liquid, solid and alkali metal batteries.

The application belongs to the technical field of sodium ion battery materials, and particularly relates to a preparation method of an organic PSF modified NZZSP electrolyte material and application research of the sodium ion battery. The preparation method of the NASICON type solid-state composite electrolyte material can include the following steps: preparing a doped modified NASICON electrolyte sheet through a high-temperature solid-phase synthesis method, and then constructing an organic PSF interface coating layer on the surface of the modified NASICON electrolyte sheet through an in-situ polymerization method. The organic PSF modified NZZSP electrolyte prepared in the application effectively improves the electrochemical performance of the sodium ion battery, wherein the in-situ polymerized organic PSF modification coating layer can effectively improve the electrolyte / electrode interface contact, and can form a stable and uniform electrolyte / electrode interlayer. 2+ Partially doped and substituted Zr 4+ The Si / P ratio and Zn Benefiting from the synergistic effect of the two, the prepared organic PSF modified NZZSP electrolyte exhibits excellent capacity retention rate and cycle stability in the sodium ion battery.

The invention discloses an aluminum alloy hard oxidation process, and relates to the technical field of aluminum alloy part surface treatment, the aluminum alloy hard oxidation process comprises the following steps: S1, pretreatment: oil removal, alkali corrosion treatment and acid pickling neutralization; s2, hard oxidation is conducted, specifically, the pretreated workpiece is put into an oxidation tank with electrolyte and a stirring system to be subjected to stirring and oxidation treatment; and S3, post-treatment: cleaning with hot water, sealing with nickel acetate and drying in a drying oven. The process mainly comprises the following steps: carrying out pretreatment of oil removal by an organic solvent, alkali etching and acid pickling, combining sulfuric acid-citric acid-monopotassium phosphate composite electrolyte, pulsed power supply and gradient boosting oxidation, carrying out ultrasonic stirring and precise temperature control hard oxidation, and finally carrying out nickel acetate sealing aftertreatment. The four industrial problems of poor batch consistency of oxidation films of aluminum alloy workpieces, non-uniformity of complex workpieces, high energy consumption and poor compatibility to high alloy materials are thoroughly solved, and the oxidation film which is high in hardness, uniformity and corrosion resistance and saves energy is obtained.

The invention provides a composite electrolyte film and a preparation method thereof and a secondary battery, and belongs to the field of lithium battery, the composite electrolyte film comprises a polymer matrix, and a lithium salt and a composite material distributed in the polymer matrix, the composite material comprises a porous oxide solid electrolyte and a halide solid electrolyte filled in pores of the porous oxide solid electrolyte. The invention aims to provide the solid electrolyte with high ionic conductivity, wide electrochemical window and good mechanical property.

The invention belongs to the technical field of battery technologies, and provides nanowire solid-state composite electrolyte slurry and a preparation method and application thereof.The nanowire solid-state composite electrolyte slurry comprises inorganic ceramic nanowires, a high-molecular polymer material, lithium salt, ionic liquid and an organic solvent, the diameter of the inorganic ceramic nanowires is 220-260 nm, the inorganic ceramic nanowires are arranged in the nanowire solid-state composite electrolyte slurry in a disordered mode, and the inorganic ceramic nanowires are arranged in the high-molecular polymer material. In the solid-state battery, the nanowire solid-state composite electrolyte slurry is attached to two sides of a diaphragm in the form of a membrane. According to the nanowire solid-state composite electrolyte slurry disclosed by the invention, the nanowire filler with a high aspect ratio is utilized to optimize an inner interface of the solid-state composite electrolyte, so that the electrolyte has the advantages of relatively good thermal stability, electrochemical stability and high ionic conductivity, and is easy to form and process; the solid-state composite electrolyte is a novel solid-state composite electrolyte with excellent comprehensive performance, can be matched with lithium metal and a high-voltage positive electrode to construct a solid-state lithium battery with high specific energy and high safety, and is high in use value and good in application prospect.

The invention discloses a composite electrolyte and a preparation method and application thereof. The composite electrolyte comprises a lithium salt, a solvent, a Lewis acid precursor, a Lewis acid trapping agent and a thermal response monomer, the mass content of the Lewis acid precursor is 0.1-5%, the mass content of the Lewis acid trapping agent is 2-5%, and the mass content of the thermal response monomer is 5-30%. The composite electrolyte can be rapidly polymerized at high temperature, so that the thermal stability of the electrolyte is improved, an ion transmission path is cut off, meanwhile, the composite electrolyte can be stably kept in a liquid state in a non-high-temperature environment, the electrochemical performance of the composite electrolyte is not influenced, and the composite electrolyte can be compatible with various storage and use environments; the problems of gas production and fire in the thermal runaway process of the battery can be remarkably inhibited, the safety of the battery is improved, and the electrical performance of the battery in a normal operation state is not influenced.

The invention provides a water-based composite electrolyte and a preparation method and application thereof. The water-based composite electrolyte comprises soluble zinc salt, amino acid hydrochloride additives and deionized water. The aqueous composite electrolyte can be used for a symmetrical button cell, a half cell or an aqueous zinc ion total cell. By adjusting zinc ion deposition on the surface of the zinc electrode, the growth of zinc dendrites is reduced, and the shuttle effect of the iodine positive electrode is inhibited, so that the coulombic efficiency and the cycle performance of the water-based zinc-iodine battery are improved. The additive disclosed by the invention can be adsorbed on the surface of a zinc negative electrode, delays the nucleation process and inhibits the growth of zinc dendrites; the form of hydrochloride can play a role of a buffer solution, stabilize the pH value of the electrolyte, inhibit the corrosion of the zinc negative electrode and reduce the hydrogen evolution reaction; the hydrochloride form can weaken the protonation effect of amino acid groups and enhance the electrostatic interaction between the amino acid groups and the polyiodide, so that the shuttle effect is inhibited, and the coulombic efficiency and the cycle performance of the aqueous zinc-iodine battery are improved.

The invention discloses an aqueous zinc-vanadium battery electrolyte preparation method and a battery, and belongs to the technical field of aqueous zinc ion batteries. The preparation method comprises the following steps: preparing a polyquaternium aqueous solution; and adding soluble zinc salt into the polyquaternium aqueous solution, stirring and dissolving to obtain the composite electrolyte. According to the electrolyte, through the synergistic effect of the polyquaternary ammonium salt and the zinc salt, the acidity and water activity of a system are effectively reduced, dendritic crystal growth and hydrogen evolution reaction of a zinc negative electrode are inhibited, meanwhile, a nitrogen-containing protective layer is formed on the surface of a vanadium positive electrode, and vanadium dissolution is reduced. The battery containing the electrolyte shows excellent cycle stability in a wide temperature range of-20 to 80 DEG C, the cycle life of the zinc symmetric battery exceeds 3000 hours, the capacity retention rate of the whole battery after 4000 cycles reaches 87.6%, and the technical problems of aggravation of interface side reaction and fast degradation of battery performance under high-temperature and high-acidity conditions are solved.

The invention provides a composite electrolyte for a secondary metal battery as well as a preparation method and application of the composite electrolyte. The preparation method comprises the following steps: firstly, adding soluble zinc salt into deionized water to prepare an aqueous zinc salt electrolyte, gradually adding the amino acid additive after the pH value of the aqueous zinc salt electrolyte is stable, continuously stirring until the amino acid additive is completely dissolved, and standing to obtain the aqueous composite electrolyte containing the amino acid additive. Ammonium radicals of amino acids exist in the form of-NH4 or-NH3 +, and carboxyl exists in the form of-COOH or-COO-; the-NH3 < + > can be electrostatically adsorbed on the surface of the zinc negative electrode to change an electric double layer structure and prevent free water molecules from being adsorbed and electrolyzed, and the-NH4, the-COOH and the-COO <-> can change a hydrated zinc ion solvation structure and reduce the number of coordination numbers and active water molecules released in a desolvation process; the composite electrolyte is far better than an existing composite electrolyte obtained by using an amino acid additive, and the performance of a secondary zinc metal battery is effectively improved.

This invention belongs to the field of solid waste resource utilization and energy storage technology, specifically relating to a highly conductive, ion-uniformly distributed porous solid waste-fiber composite electrolyte and its preparation and application. Currently, cement-based electrolytes exhibit low ionic conductivity, small pore size, and poor connectivity. This invention involves bridging two copper meshes with fibers to form a chain-like aggregate structure, creating a three-dimensional framework. A mixed slurry of steel slag, mineral powder, and polymer microspheres is then filled into this framework. The polymer microspheres are then removed to create uniformly distributed pores, yielding the solid waste-fiber composite electrolyte. This invention utilizes industrial solid waste to prepare the electrolyte matrix, introduces fibers to form short-distance interconnected ion channels, and incorporates soluble polymer microspheres to create a controllable and uniformly distributed pore structure within the solid waste-fiber composite electrolyte, thereby improving the electrolyte's ionic conductivity. The prepared composite electrolyte can be used to assemble supercapacitors, achieving performance optimization.

The invention provides a preparation method and application of an air-stable sulfide composite electrolyte, and the method comprises the following steps: S1, weighing an M source (M = Cd, Mn and Zn), P2S5 and S powder according to a ratio of 1: 1: 3, adding iodine for catalysis, carrying out heat preservation at 700-720 DEG C for 6-7 days, and carrying out K + insertion, Li + exchange and ultrasonic centrifugation to prepare a LiMyPS3 nanosheet dispersion liquid; s2, dissolving PEO and LiTFSI in acetonitrile to form a film, drying to obtain a pure PEO film, immersing the pure PEO film into a dopamine Tris buffer solution with the concentration of 2 mg / ml and the pH value of 8.5, oscillating for 12-24 hours in an oxygen environment, and washing and drying to obtain a PDA-coated PEO film; and S3, carrying out suction filtration on the LiMyPS3 dispersion liquid to obtain a self-supporting membrane, stacking according to the sequence of "PDA-coated PEO membrane-sulfide membrane-PDA-coated PEO membrane", carrying out isostatic pressing at 10-20 MPa, and then carrying out vertical cutting at 0 DEG C to obtain the 20-30 [mu] m composite membrane. The film has the advantages of good air stability, almost no loss of conductivity after 30 days, room temperature conductivity of 9.2-10.2 ms / cm, excellent interface bonding force and mechanical strength, and stable window of 4.3-4.5 V, is adaptive to a high-voltage positive electrode, and can be used for a high-energy-density solid-state lithium battery.

The invention discloses lithiated cross-linked synanthrin, a preparation method thereof and application of the lithiated cross-linked synanthrin in an organic / inorganic composite solid electrolyte, and relates to the technical field of polymers and solid electrolytes. The lithiated cross-linked synanthrin provided by the invention is prepared by taking sodium hexametaphosphate and the like as a cross-linking agent to cross-link synanthrin and then adding lithium salt to lithiate the cross-linked synanthrin in an ion exchange manner, so that the stability of an organic / inorganic interface in an organic / inorganic composite solid electrolyte can be improved; the composite strength of the organic electrolyte and the inorganic electrolyte is improved, and meanwhile, the three-dimensional cross-linked structure can introduce an additional lithium ion transmission channel into an electrolyte matrix. Based on this, the composite electrolyte prepared by the invention can have significantly improved ionic conductivity and a wider electrochemical window.

The present application relates to an organic-inorganic composite solid electrolyte and a preparation method thereof, which is prepared by compounding an oxide solid electrolyte, an unsaturated polymer crosslinked in situ on the surface of the oxide solid electrolyte, and a polar organic solvent, so as to prepare an organic-inorganic composite solid electrolyte with higher room-temperature ionic conductivity and a wider electrochemical window. The composite solid electrolyte prepared by the present application has a room-temperature ionic conductivity of 0.1 mS / cm or higher, an electrochemical window of greater than 4.5 V, and an alkali metal cation transference number of greater than 0.9. In addition, the composite solid electrolyte is easy to be formed into a film, and the composite solid electrolyte film prepared has a thin thickness. A solid-state alkali metal battery assembled with the electrolyte film has good interface stability with the positive and negative electrodes, and can inhibit the growth of alkali metal dendrites, thereby significantly improving the performance of the battery.

The application discloses a LiI / LiNO3 composite electrolyte applied to a Li-O2 battery and a use method thereof, the LiI / LiNO3 composite electrolyte comprises a main body liquid and an additive liquid, the main body liquid comprises a LiI solution and a LiTFSI solution, the concentration of the LiI solution is 0.5mol / L-1.5mol / L, the concentration of the LiTFSI solution is 0.5mol / L-1.5mol / L, the volume proportion of the LiI solution in the main body liquid is 70%-90%, the additive liquid comprises a LiNO3 solution, the concentration of the LiNO3 solution is 0.5mol / L-1.5mol / L, and the volume proportion of the additive liquid in the electrolyte is 5%-25%. The use method of the LiI / LiNO3 composite electrolyte is that the main body liquid and the additive liquid are respectively and uniformly dropped on a battery diaphragm of the Li-O2 battery, the total volume of the electrolyte is determined according to the area of the battery diaphragm, and 40muL-60muL of the electrolyte is needed for each square centimeter of the battery diaphragm. The electrolyte can effectively prolong the service life of the Li-O2 battery by adding the LiI to reduce the charging potential of the battery and by adding the LiNO3 to stabilize the discharging process of the battery.

Disclosed are carbon fibers, and a preparation method therefor and the use thereof. The preparation method for the carbon fibers comprises: using a polyacrylonitrile precursor as a raw material to prepare graphitized fibers; and sequentially subjecting the graphitized fibers to an electrochemical oxidation surface treatment and sizing same to obtain carbon fibers., wherein the electrochemical oxidation surface treatment comprises: sequentially subjecting the graphitized fibers to a primary surface treatment and a secondary surface treatment, with the primary surface treatment being performed by using an alkaline electrolyte having hydroxide, and the secondary surface treatment being performed by using a composite electrolyte of ammonium acetate and ammonium dihydrogen phosphate.

Disclosed is a separator comprising: a base film; the surfaces of the two sides of the base membrane are coated with the first composite coatings, the first composite coatings comprise first high-temperature-resistant fibers and first ceramic particles dispersed in the first high-temperature-resistant fibers, and the first ceramic particles have the first D50 particle size; the outer side surface of the first composite coating is coated with the second composite coating, the second composite coating comprises second high-temperature-resistant fibers and second ceramic particles dispersed in the second high-temperature-resistant fibers, and the second ceramic particles have the second D50 particle size. Wherein the first D50 particle size is smaller than the second D50 particle size. According to the diaphragm disclosed by the invention, the temperature resistance and the ionic conductivity of the diaphragm are improved.

The invention discloses a metal oxide modified fiber material as well as a preparation method and application thereof. The preparation method comprises the following steps: stirring and dissolving tetraethoxysilane, tungsten chloride, ethanol and hydrochloric acid to form a uniform solution; mixing and dissolving polyvinylpyrrolidone, N, N-dimethylformamide and dimethyl sulfoxide to form another solution; mixing the solutions to prepare a spinning solution, and performing electrostatic spinning to obtain fibers; and dissolving a polyvinylidene fluoride-hexafluoropropylene copolymer and lithium bis (fluorosulfonyl) imide in N-methyl pyrrolidone to form a homogeneous solution, adding the fibers, stirring and mixing, casting to form a film, blade-coating the film to a predetermined thickness, and performing vacuum drying to obtain the target composite electrolyte. The method comprises the following steps: preparing a silicon dioxide nanofiber loaded tungsten oxide nanowire with a high length-diameter ratio through electrostatic spinning, and compounding the silicon dioxide nanofiber loaded tungsten oxide nanowire with a polyvinylidene fluoride-hexafluoropropylene copolymer matrix. The method is simple, convenient, efficient and low in cost, the prepared solid electrolyte is high in stability, the long cycle performance of the battery is remarkably improved, and an important basis is provided for optimizing polyvinylidene fluoride-hexafluoropropylene copolymer based electrolyte and developing a high-performance all-solid-state lithium ion battery.

The application discloses a composite electrolyte and a preparation method and application thereof. The composite electrolyte comprises a lithium salt, a solvent, a Lewis acid precursor, a Lewis acid capturing agent and a thermal response monomer, the mass content of the Lewis acid precursor is 0.1-5%, the mass content of the Lewis acid capturing agent is 2-5%, and the mass content of the thermal response monomer is 5-30%. The composite electrolyte can rapidly polymerize at high temperature, so that the electrolyte thermal stability and the ion transmission path are cut off, meanwhile, the electrolyte can stably keep liquid state in a non-high-temperature environment, and the electrochemical performance is not affected, and the electrolyte is compatible with various storage and use environments. When the electrolyte is applied to a lithium ion battery, the electrolyte can significantly inhibit gas production and fire in a battery thermal runaway process, improves the safety of the battery, and does not affect the electrical performance of the battery in a normal operation state.

The application discloses a preparation method and application of a composite sulfur positive electrode packaged by a sulfide-halide composite electrolyte shell. The composite sulfur positive electrode packaged by the sulfide-halide composite electrolyte shell has a core-shell structure, the inner core is a sulfur-carbon composite material, and the outer layer is a sulfide-halide composite electrolyte shell. Based on the unique heterostructure of the sulfide-halide composite electrolyte shell, the volume change effect of sulfur in the charging and discharging process can be effectively relieved, the uniform stress distribution and effective contact in the composite positive electrode are ensured, and the utilization rate of the positive active material and the energy density of the whole battery are improved. At the same time, the composite sulfur positive electrode provided by the application has high ionic conductivity at room temperature, can significantly improve the positive electrode reaction kinetics, improve the capacity and rate performance of the battery, can be used for assembling and preparing solid-state lithium-sulfur batteries, has good safety performance and high energy density, and has a wide application prospect.

The invention discloses a sulfide-based high-performance multi-component composite electrolyte preparation method, and relates to the technical field of composite electrolytes.The sulfide-based high-performance multi-component composite electrolyte preparation method comprises the following steps that 1, initial materials are added into organic solvents according to a certain stoichiometric ratio, and the organic solvents are anhydrous acetonitrile and tetrahydrofuran; 2, heating and stirring for a period of time under proper reaction conditions; 3, after the reaction is finished, the liquid solvent is evaporated through a certain chemical means; and 4, drying in a vacuum oven to obtain a glassy sulfide solid electrolyte material, further crystallizing to obtain the high-performance multi-component composite electrolyte, and the initial materials in the step 1 comprise a lithium phosphorus sulfur chlorine solid electrolyte, polyethylene oxide, thermoplastic polyamide, an inorganic filler, an electrolyte additive and a positive electrode additive. By adding the electrolyte additive, the positive electrode additive and the negative electrode additive, the performance of the multi-element composite electrolyte can be effectively improved, so that the multi-element composite electrolyte is more stable in use and longer in service life.

The application discloses a composite electrolyte buffer layer for solid oxide electrolysis cell and a preparation method, and relates to the technical field of SOFC electrolyte. The composite electrolyte buffer layer is formed by sequentially sputtering electrolyte sputtering dense layer I, electrolyte sputtering dense layer II and anode sputtering layer on the surface of the electrolyte layer of the solid oxide electrolysis cell. The thickness of the electrolyte sputtering dense layer I is 10 nanometers to 1 micrometer, the thickness of the electrolyte sputtering dense layer II is 50 nanometers to 500 nanometers, and the thickness of the anode sputtering layer is 5 nanometers to 30 nanometers. The composite electrolyte nanometer buffer layer prepared by the magnetron sputtering method has the advantages of blocking electrons, improving open circuit voltage, enhancing ion conductivity to reduce ohmic resistance, enhancing chemical compatibility and thermal matching with electrodes to improve long-term stability, etc. The composite electrolyte nanometer buffer layer solves the problem of internal leakage of the traditional low-temperature electrolyte, improves the open circuit voltage to above 1.00V (600 DEG C), improves the output power and stability of the solid oxide electrolysis cell, and expands the application range of the solid oxide electrolysis cell.