265 results about "Composite electrolyte" patented technology

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 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 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 invention relates to the technical field of all-solid-state lithium batteries, and discloses a high-ionic-conductivity inorganic nanoparticle dispersed polyether composite solid electrolyte composition, which is prepared from the following components in percentage by weight: 35 to 65 percent of inorganic solid electrolyte nanoparticles, 15 to 45 percent of polyether polymer matrix precursor, 2 to 8 percent of cross-linking agent, 10 to 20 percent of lithium salt and initiator, wherein the molar ratio of lithium salt to ether oxygen atoms is 1 / 20, a three-dimensional cross-linked network is constructed through an in-situ ultraviolet polymerization reaction, high-content inorganic nanoparticles are physically locked in a polymer grid, and a continuous ion transmission channel is constructed at room temperature through a percolation effect while particle aggregation is inhibited, so that the high-content inorganic nanoparticles can be prepared. The composition has excellent ionic conductivity and mechanical flexibility, effectively solves the problems of high brittleness and low conductivity of the traditional composite electrolyte, only needs wet coating in the preparation process, and is suitable for large-area film production.

The invention discloses a composite solid electrolyte material with a core-shell structure and a preparation method and application thereof, and belongs to the technical field of solid-state batteries. The material consists of a solid-state electrolyte core and a halide solid-state electrolyte lithium indium chloride shell layer coated on the surface of the solid-state electrolyte core. The excellent water stability and viscoelasticity of the halide electrolyte are utilized to effectively protect the inner core of the solid electrolyte from being eroded by humid air and improve the interface contact with the electrode; meanwhile, the material cost is greatly reduced by using the cheap solid electrolyte core as the main body. The preparation method adopts a simple ball-milling coating process, and is high in controllability. The composite electrolyte material is excellent in comprehensive performance, low in cost and suitable for preparing the high-performance and high-safety solid-state lithium ion battery.

The present invention relates to a solid composite electrolyte comprising a) at least one fluoroelastomer and b) at least one sulfide-based solid ionic conducting inorganic particles that differs from a lithium salt, wherein a) the fluoroelastomer comprises recurring units derived from i) vinylidene difluorides and ii) from 15.0 to 80.0 mol % of at least one C2-C8 chloro and / or bromo and / or iodo fluoroolefin, the mol % being relative to the total moles of recurring units, wherein the solid composite electrolyte does not contain a lithium salt; to a slurry for manufacturing a solid composite electrolyte comprising a) a fluoroelastomer and b) a sulfide-based solid ionic conducting inorganic particle that differs from a lithium salt, and c) at least one non-aqueous solvent, wherein the slurry does not contain a lithium salt; and to a solid-state battery comprising a positive electrode, a negative electrode and a membrane, at least one among which comprises a solid composite electrolyte according to the present invention. The present invention also relates to a binder solution for a solid-state battery comprising a) at least one fluoroelastomer and c) at least one non-aqueous solvent.

A battery cell (20) comprises - an anode (31) which contains lithium metal, - a cathode (32), - an asymmetric composite electrolyte (40) with a first layer (41) and with a second layer (42), wherein the first layer (41) is in contact with the anode (31), wherein the second layer (42) is in contact with the cathode (32), wherein the first layer (41) comprises a lithium phosphorus sulfur chloride and a poly(ethylene oxide) as components, and wherein the second layer (42) comprises a lithium aluminum titanium phosphate and a poly(ethylene oxide) as components.

The invention discloses a composite electrolyte for an aqueous zinc ion battery and application of the composite electrolyte, and belongs to the technical field of electrochemical energy storage. The composite electrolyte comprises water, zinc salt and a composite additive; the composite additive includes group III metal ions as a first additive and group V metallate ions as a second additive. The invention also provides a group III metal cation doped vanadium oxide positive electrode material matched with the first additive element in the electrolyte. The composite electrolyte provided by the invention is combined with a correspondingly doped positive electrode material, so that the composite electrolyte can synergistically act on positive and negative electrode interfaces of the battery: V-group metal acid radical ions preferentially regulate and control a zinc negative electrode interface, guide zinc to be uniformly deposited and inhibit side reaction; group III metal ions are mainly used for stabilizing the bulk phase and interface structure of the positive electrode material and inhibiting the dissolution of active substances. According to the technical scheme, the rate capability, the cycling stability and the service life of the water-based zinc ion battery are remarkably improved, and the water-based zinc ion battery has important application value.

The invention provides a secondary battery, a preparation method thereof and electric equipment, the secondary battery comprises a shell, at least one electrode assembly and an electrolyte, the electrode assembly and the electrolyte are arranged in the shell, and the electrode assembly comprises a positive pole piece, an isolating membrane and a negative pole piece which are stacked in sequence; a composite liquid storage structure is arranged between the electrode assembly and the shell, the composite liquid storage structure comprises a first layer and a second layer which are sequentially stacked in the direction, close to the shell, of the electrode assembly, the first layer comprises a flame-retardant layer, and the second layer comprises a liquid storage layer. According to the secondary battery provided by the invention, the problem that the capacity is quickly attenuated and even dives due to the lack of electrolyte in the circulation of the secondary battery can be effectively solved.

Provided is a composite electrolyte containing an inorganic solid electrolyte and an organic solid electrolyte, the organic solid electrolyte containing a molecular crystal and having a porosity of 15% or less.

This application discloses a battery cell, a composite electrolyte, a battery device, and an electrical device. The battery cell of this application includes a positive electrode, a composite electrolyte, and a negative electrode. The composite electrolyte includes a solid electrolyte sheet and a liquid electrolyte. The solid electrolyte sheet is disposed between the positive and negative electrode sheets and includes a solid electrolyte and multiple voids. The liquid electrolyte can permeate through the voids. In the composite electrolyte, the mass percentage of the solid electrolyte is A, and the mass percentage of the liquid electrolyte is B. The mass percentages of the solid electrolyte and the liquid electrolyte satisfy: 5 ≤ A / B ≤ 950. In the composite electrolyte of the battery cell of this application, the solid electrolyte and liquid electrolyte are combined. The liquid electrolyte can permeate through the voids in the solid electrolyte sheet, thereby improving the ionic conductivity and effectively improving the problem of poor contact at the electrolyte-electrode interface.

The present invention relates to a binder solution for a secondary battery, comprising at least one non-aqueous solvent and at least one fluoropolymer comprising recurring units derived from a) vinylidene difluorides and b) at least one fluorinated olefin monomer containing at least one —SO2X functional group, X being selected from X′ and OM, X′ being selected from the consisting of F, Cl, Br, and I; and M being selected from the group consisting of H, an alkaline metal and NH4, wherein b) the fluorinated olefin monomer is present in an amount from 0.1 to 10.0 mol %, the mol % being relative to the total moles of recurring units; to a solid composite electrolyte comprising at least one fluoropolymer according to the present invention and at least one sulfide-based solid ionic conducting inorganic particle; to a slurry for manufacturing a solid composite electrolyte comprising a binder solution according to the present invention and at least one sulfide-based solid ionic conducting inorganic particle, optionally further comprising at least one electroactive material and / or at least one conductive agent; and to an electrode comprising at least one fluoropolymer according to the present invention and at least one electroactive material, optionally further comprising at least one conductive agent and / or at least one sulfide-based solid ionic conducting inorganic particle. The present invention also relates to a secondary battery comprising a positive electrode, a negative electrode, and a membrane that is positioned between the positive electrode and the negative electrode, wherein at least one of the positive electrode, the negative electrode and the membrane comprises at least one fluoropolymer according to the present invention, optionally further comprising at least one sulfide-based solid ionic conducting inorganic particle, at least one electroactive material and / or at least one conductive agent.

The application relates to a preparation method of a composite electrolyte membrane, and steps of the method comprise the following: S1, dissolving polyethylene terephthalate in a first organic solvent, and preparing a three-dimensional macroporous membrane through electrostatic spinning; after sequentially performing acid modification treatment and lithium ion exchange treatment on the three-dimensional macroporous membrane, a carrier is obtained; S2, dissolving a sulfide electrolyte, a binder and a dispersant in a second organic solvent to obtain a slurry; S3, scraping the slurry on the surface of the carrier, and performing first drying on the carrier coated with the slurry to obtain an intermediate electrolyte membrane; spraying the slurry on the surface of the intermediate electrolyte membrane again, and performing second drying on the intermediate electrolyte membrane coated with the slurry to obtain the composite electrolyte membrane. Through the acid modification treatment, the lithium ion exchange treatment and the scraping and then spraying, the preparation method improves the interaction force between the electrostatic spinning membrane and the sulfide electrolyte slurry, so that the compactness of the composite electrolyte membrane is improved.

The invention discloses a preparation method of high-strength and high-toughness graphene-doped composite copper foil, which comprises the following steps: S1, treating graphene by adopting a high-energy ball milling method to obtain nano-sized defective graphene; s2, preparing a composite electrolyte containing the defective graphene, and adding the composite electrolyte into an industrial electrolytic cell after ultrasonic dispersion; s3, adding a compound additive into the electrolytic bath, and uniformly mixing through air blowing and ultrasound; s4, direct current is introduced, so that graphene and copper ions are co-deposited on the surface of the cathode roller to prepare a composite copper foil; and S5, carrying out acid pickling, water washing, drying, stripping and rolling on the composite copper foil. According to the invention, through doping of nano-scale defective graphene, on one hand, active sites are provided for copper deposition so as to refine grains, increase grain boundaries and hinder dislocation motion; on the other hand, due to the fact that the size of the defective graphene is matched with the height of copper grains, the strength can be improved through dislocation pinning and back stress strengthening, meanwhile, a multi-slip system is activated, dislocation storage is promoted to improve plasticity, the balance dilemma of the strength and the ductility of the copper foil is broken through finally, the copper foil has the high-strength and high-toughness characteristics, and the design requirement for the high energy density of the lithium ion battery is met.

This invention belongs to the field of metal surface treatment technology, specifically relating to a method for preparing a corrosion-resistant and wear-resistant composite film with strong adhesion on a magnesium alloy wheel substrate. It is applicable to the surface protection of lightweight automotive components. The method involves using an AZ91D magnesium alloy wheel, pre-treating it with a weakly alkaline composite electrolyte, and preparing a MAO coating using micro-arc oxidation. The MAO-coated magnesium alloy wheel is then immersed in a composite sol and gelled for 1-2 hours in an environment with 60%-80% humidity to form a semi-solidified transparent gel film. Subsequently, it is dried in an oven at 60-80℃ for 1 hour, and finally heated to 150-400℃ and held for 1.5 hours to complete the curing. Following this, a diamond thin film is deposited using MPCVD vapor deposition. This invention solves the core pain points of magnesium alloys being easily worn and corroded, achieving ultra-hard protection.

This invention provides a composite solid-state electrolyte membrane and its preparation method, relating to the field of lithium battery technology. It comprises the following components in parts by weight: 15-25 parts flame-retardant microcapsules with a core-shell structure; the shell being EDTA-modified LATP nanoparticles and the core being expanded monomers; 20-30 parts amino-modified carbon nitride; 60-80 parts bacterial cellulose membrane; and 40-60 parts polyethylene oxide particles. The composite electrolyte membrane exhibits high thermal stability and dimensional stability. The uniform deposition of each component in the microstructure forms a continuous phase, providing a rapid channel for ion migration and conduction, significantly improving battery performance and safety.

The invention relates to the technical field of batteries, and particularly discloses a preparation method and application of a composite electrolyte based on LATP skeleton support, and the composite electrolyte comprises an LATP skeleton, a polymer electrolyte and a lithium salt. The LATP framework is a ceramic material, the mechanical strength is high, the chemical stability is good, and the lithium dendrite inhibiting capacity of the electrolyte is effectively improved through a ceramic mechanical network prepared through suction filtration. The composite electrolyte is a polymer electrolyte with excellent flexibility, so that the interface impedance between the ceramic electrolyte and an electrode is reduced, and the cycling stability of the battery is improved. Preparation and application of the framework-supported ceramic / polymer composite electrolyte provide a design thought for development of solid-state lithium metal batteries with high safety, excellent rate capability and cycle performance.

The invention belongs to the field of solid electrolyte energy storage devices, and particularly relates to a CrMnCoNiZn high-entropy flame-retardant nanofiber-based solid electrolyte film and a preparation method thereof. According to the invention, PAN nanofibers are used as a matrix, a three-dimensional porous skeleton is constructed through electrostatic spinning, and a high-entropy ZIF structure composed of five metals of Cr, Mn, Co, Ni and Zn grows in situ on the surface of the three-dimensional porous skeleton, so that a composite electrolyte carrier with high stability and flame retardance is formed. And then preparing an in-situ polymerization precursor solution composed of HFBA, TEP, LiODFB and AIBN, and assembling the in-situ polymerization precursor solution, the SPAN positive electrode and the lithium negative electrode into the button cell. And inducing the system to generate in-situ polymerization under sealed aging and heating conditions to finally obtain the CrMnCoNiZn high-entropy flame-retardant nanofiber-based solid electrolyte film. The method has the advantages of stable structure, low interface impedance, prevention of polysulfide dissolution, inhibition of dendritic crystal growth and the like, and the performance and safety of the solid-state lithium-sulfur battery are remarkably improved.

The invention provides a sulfide-halide composite solid electrolyte, a preparation method thereof and a solid-state battery. The method comprises the following steps: mixing and ball-milling a sulfide electrolyte, a halide electrolyte, a dopant and an interface modifier under the protection of inert gas to obtain composite electrolyte powder; carrying out tabletting molding on the composite electrolyte powder under the protection of inert gas to obtain a composite solid electrolyte sheet; and carrying out annealing treatment on the composite solid electrolyte sheet under the protection of inert gas to obtain the sulfide-halide composite solid electrolyte. The sulfide-halide composite solid electrolyte disclosed by the invention can realize synergistic improvement of various properties, has high room-temperature ionic conductivity and a wide electrochemical stability window, is improved in air stability and is good in mechanical property.

The application provides an inorganic compound electrolyte thin film and a preparation method thereof and a solid-state battery formed by the inorganic compound electrolyte thin film, and belongs to the technical field of battery electrolytes. The compound electrolyte thin film comprises a sulfide or halide solid-state electrolyte framework and a polymer electrolyte filled in the framework. By applying a specific pore-forming agent, controlling the particle size of the sulfide or halide and the pore-forming agent and the volume ratio of the sulfide or halide and the pore-forming agent, a self-supporting sulfide or halide solid-state electrolyte framework with uniform and interconnected pore distribution is constructed on the basis of ensuring that no high-temperature phase change or decomposition occurs at a low temperature. The inorganic compound electrolyte thin film significantly improves the air stability of the sulfide and halide solid-state electrolyte, the ion conductivity is greater than or equal to 1.8 mS cm ‑1 at 30 DEG C, the ion transference number is 0.6-0.8, and the electrochemical window is greater than or equal to 4.3 V vs. Li + / Li, the energy density of the solid-state battery of the inorganic compound electrolyte is significantly improved, and the problems of poor contact between the sulfide solid-state electrolyte and the electrode, serious interface side reactions and a narrow electrochemical window are solved.

The present disclosure addresses the problem of providing a means capable of improving lithium ion conductivity in a lithium secondary battery. Provided is a lithium ion conductive composite electrolyte containing a sulfide solid electrolyte, and a mixed salt containing first anions, second anions, and lithium ions.

This application provides a composite electrolyte, a lithium-ion battery, and a gradient film formation method thereof, relating to the field of lithium-ion battery technology. The composite electrolyte includes a first electrolyte, a second electrolyte, and a third electrolyte: the first electrolyte, used for the first injection, comprises a basic lithium salt, an organic solvent, and a first film-forming additive, but does not include a second film-forming additive; the second electrolyte, used for the second injection, comprises a basic lithium salt, an organic solvent, and a second film-forming additive, but does not contain the first film-forming additive, wherein the film-forming potential of the second film-forming additive is lower than that of the first film-forming additive; and the third electrolyte, used for the third injection, comprises a basic lithium salt, an organic solvent, and a supplementary agent, the supplementary agent comprising the first film-forming additive, or the supplementary agent comprising both the first and second film-forming additives. This achieves stable and safe overall performance of the lithium-ion battery.

This invention discloses a halide composite solid electrolyte membrane, its preparation method, and a solid-state battery. The preparation method involves dissolving a polymer in an organic solvent and electrospinning it to obtain a polymer skeleton with a porous fiber structure. A halide electrolyte dispersion is then cast into the skeleton and dried to obtain a first composite electrolyte membrane. A second composite electrolyte membrane is obtained through hot pressing. Finally, a gel electrolyte solution composed of monomers, initiators, lithium salts, and plasticizers is sprayed onto the membrane surface and cured under ultraviolet light to obtain the halide composite solid electrolyte membrane. This invention effectively solves the problems of halide electrolytes being difficult to form films independently, poor air stability, and poor compatibility with metallic lithium anodes. The resulting electrolyte membrane has controllable thickness, is dense and uniform, and the assembled solid-state battery exhibits excellent cycle performance.