454 results about "Composite polymer" patented technology

The invention relates to the technical field of composite polymer cable testing, and discloses a tensile strength detection machine for composite polymer cable testing, which comprises a detection table, and also comprises an operation box fixedly connected to the bottom of the detection table; the bottom plate is fixedly connected to the bottom of the operation box; the two box bodies are fixedly connected to the two sides of the top of the detection table respectively; the pushing mechanism is arranged on the detection table and is used for pulling the composite polymer cable; the discharging mechanism is arranged above the detection table and is used for pushing the tested composite polymer cable to be discharged; and the sliding assembly is arranged on the discharging mechanism and used for limiting the composite polymer cable. Through the arranged pushing mechanism, the two ends of the composite polymer cable fixed in the two movable blocks can be synchronously pushed to move, so that the synchronous pushing effect is achieved, and the tensile strength of the composite polymer cable is detected.

The invention relates to an organic solid electrolyte for an in-situ curing high-voltage positive electrode, a battery and a preparation method. The organic solid electrolyte is formed by in-situ polymerization of ether monomers, ester monomers, a lithium salt and a solvent through synergistic thermal initiation of double initiators. The electrolyte disclosed by the invention has the advantages that the ester polymer monomer and the ether polymer monomer are blended, and then the two monomers are respectively polymerized in a thermal initiation manner to form mutually crossed macromolecular long chains. The strategy can improve the interface stability of the electrode and the electrolyte and reduce the interface impedance of the electrode and the electrolyte. In the formed polymer network structure, the ester chain segment enhances the mechanical strength and widens the electrochemical window; and the ether chain segment provides flexible and lithium ion transmission channels. Due to the chemical complementarity of the ester monomers and the ether monomers, the overall performance of the composite polymer electrolyte is improved.

The invention provides a composite polyaluminum ferric chloride water purifying agent as well as a preparation method and application thereof, and belongs to the technical field of waste resource recycling and municipal sewage treatment. The industrial hazardous waste aluminum ash is subjected to innocent treatment and then reacts with the pickling steel waste liquid of the steel mill, and the polyaluminum ferric chloride meeting the industrial standard is prepared. The polyaluminum ferric chloride and a cationic adsorbent are compounded according to a specific proportion to obtain the composite polyaluminum ferric chloride water purifying agent. According to the method provided by the invention, the resource recycling of hazardous wastes is realized, and the composite polyaluminum ferric chloride water purifying agent obtained by the method is used for treating municipal sewage, so that the treated water quality can reach the first-grade discharge standard A.

The invention belongs to the technical field of adhesives, and particularly relates to a hot-melt pressure-sensitive adhesive and a preparation method thereof.The hot-melt pressure-sensitive adhesive is prepared from, by weight, 100 parts of modified styrene-butadiene-styrene block copolymer, 10-20 parts of rosin pentaerythritol ester, 15-20 parts of polybutylene, 0.5-1 part of antioxidant, 1-5 parts of flexibilizer and 0.5-2 parts of filler; wherein the flexibilizer is prepared from 10-20 parts of lactic acid, 1-5 parts of phenylalanine and 5-8 parts of epoxidized soybean oil through a copolymerization reaction. According to the invention, the styrene-butadiene-styrene block copolymer is modified by lactic acid, the epoxidized soybean oil is activated and modified by lactic acid and phenylalanine, and a winding system is formed through the cooperation of the modified styrene-butadiene-styrene block copolymer, the flexibilizer, pentalyn and polybutylene; and finally, forming a uniform system with the antioxidant and the filler, thereby enhancing the toughness and permanent adhesion of the hot-melt pressure-sensitive adhesive.

Color changeable indicator particles having a meltable, particulate organic core, and at least one color changeable indicator coated on the particulate organic core. Color changeable indicator particles can be incorporated into composite polymer materials while maintaining the efficacy and stability of the indicator. The indicators provide simple, reliable, and cost effective detection means for detecting ammonia and carbon dioxide, and may find use in applications such as food packaging and medical applications.

The invention belongs to the technical field of lithium ion solid-state batteries, and relates to a composite polymer electrolyte membrane as well as a preparation method and application thereof. The preparation method of the composite polymer electrolyte membrane comprises the following steps: generating a precursor salt containing Ba and Ti on the surface of an inorganic solid electrolyte through a wet chemical method, and forming a compact barium titanate coating layer on the surface of the electrolyte in a high-temperature calcination process to obtain the barium titanate surface modified inorganic solid electrolyte; uniformly dissolving a high-molecular polymer material, the barium titanate surface modified inorganic solid electrolyte and a lithium salt in a solvent, heating and stirring to prepare a uniform solution; and drying to form a membrane to obtain the polymer composite electrolyte membrane. Barium titanate has a special piezoelectric property and can be spontaneously polarized in a crystal structure to generate a polarization field, and the polarization field can sensitively sense the nonuniformity of lithium ion transmission dynamics and interact with the nonuniformity to balance the transmission process of lithium ions in the solid electrolyte, so that the bottleneck problem of ion migration in the traditional electrolyte is solved.

A method of preparing a polyamide composite membrane using a vapor-assisted electrostatic spray is provided which relates to the field of preparation of polyamide composite membranes and comprises: step S1, adjusting a relative humidity of a surrounding environment of an electrostatic spray equipment to 80% to 90%; step S2, taking an amine monomer solution and an acyl chloride monomer solution as raw materials and placing the two raw materials in a spray system of the electrostatic spray equipment; step S3, wrapping a polymer ultrafiltration membrane on a receiving roller of the electrostatic spray equipment and setting electrostatic spray process parameters for electrostatic spraying; step S4, taking down an electrostatically-sprayed composite polymer membrane and placing the composite polymer membrane in an environment of 50 to 80° C. for heat treatment of 5 to 20 minutes, to prepare a finished polyamide composite membrane.

The invention discloses a heterogeneous multilayer composite polymer electrolyte and application thereof, and belongs to the technical field of new energy materials, the heterogeneous multilayer composite polymer electrolyte is composed of an intermediate composite polymer electrolyte, a negative electrode side polymer electrolyte and a positive electrode side gel electrolyte, the middle composite polymer electrolyte is located between the negative electrode side polymer electrolyte and the positive electrode side gel electrolyte and is of a sandwich structure; the middle composite polymer electrolyte is composed of a polymer matrix A, a lithium salt and inorganic ceramic, the negative electrode side polymer electrolyte is composed of a polymer matrix B, a lithium salt and an additive, and the positive electrode side gel electrolyte is composed of a polymeric monomer, a lithium salt, a solvent and an additive. According to the invention, the interfacial compatibility between the composite polymer electrolyte and positive and negative electrodes is improved, and the interfacial ion transmission efficiency and the uniform precipitation of lithium ions are promoted.

An exemplary embodiment of the present disclosure provides a method for making an electrolyte, comprising: providing a solid polymer electrolyte (SPE); incorporating boron nitride with the SPE to form a composite polymer electrolyte (CPE), wherein the boron nitride is at least one of exfoliated hexagonal boron nitride (ex-BN) or fluorine-fimctionalized hexagonal boron nitride (BN-F).

The invention belongs to the field of thickening agents, and particularly relates to a multi-component copolymerization thickening agent for fracturing and a preparation method of the multi-component copolymerization thickening agent for fracturing. The preparation method comprises the following steps: reacting acryloyl chloride with 4-(p-hydroxyphenyl)-2-butanol to prepare a phenyl-containing monomer; copolymerizing the modified hydrotalcite, a phenyl-containing monomer, a matrix and a functional monomer to obtain a composite polymer; and drying and crushing the composite polymer to obtain the multi-component copolymerization thickening agent for fracturing. The thickening property and the salt resistance of the multi-component copolymerized thickening agent for fracturing are obviously improved, and the multi-component copolymerized thickening agent for fracturing is high in stability at high temperature and under mechanical shearing.

The invention provides a composite polymer coconut shell charcoal tufted carpet as well as a preparation method and application thereof, and belongs to the field of polymer composite carpets. The adsorption layer is compounded on the back surface of the bonding layer, so that organic matters and toxic and harmful substances in the carpet are efficiently removed. The coconut shell charcoal in the adsorption layer is acidified by nitric acid, then an active functional group is introduced, the coconut shell charcoal and a titanium source are subjected to a hydrothermal reaction, then calcination is performed to improve the crystallinity and the interface bonding force, and the adsorption-photocatalytic decomposition dynamic cycle of volatile organic compounds is achieved. And meanwhile, interlayer adhesion is enhanced by combining a needling process, and high mechanical strength and environmental protection performance are synchronously realized. Through multi-component cooperation and process optimization, a carpet solution with functionality and durability is provided for the fields of automotive interiors and the like.

The invention discloses an epoxy resin-based amorphous polymer electrolyte and a preparation method of a composite polymer electrolyte. The electrolyte is composed of an epoxy resin-based amorphous polymer electrolyte, a metal organic framework and inorganic solid electrolyte powder. In the preparation process of the composite electrolyte, a metal organic framework material is introduced, and lithium salt anions are anchored through unsaturated metal coordination sites, so that the lithium ion transference number of the composite electrolyte is increased. In addition, the introduced inorganic solid electrolyte powder further improves the ionic conductivity of the composite electrolyte, so that the composite electrolyte can meet the charge-discharge cycle requirements of the lithium iron phosphate battery at room temperature and a certain rate. The preparation method of the polymer electrolyte is simple, raw materials are easy to obtain, and the polymer electrolyte has industrial production and application prospects and has a heuristic effect on development of polymer-based solid-state batteries.

The invention discloses a lithium aluminum titanium phosphate composite polymer as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The preparation method of the titanium-aluminum-lithium phosphate composite polymer comprises the following steps: dissolving a polymer monomer and a lithium salt in an organic solvent in an inert atmosphere, then adding silane coupling agent modified titanium-aluminum-lithium phosphate, reacting, and then adding a cross-linking agent to carry out cross-linking polymerization on the polymer monomer and the silane coupling agent modified titanium-aluminum-lithium phosphate to obtain the titanium-aluminum-lithium phosphate composite polymer. And curing to obtain the lithium titanium aluminum phosphate composite polymer. Reaction sites dispersed in a polymer chain react with surface groups of the silane coupling agent modified LATP, so that the modified LATP particles are uniformly dispersed along the polymer chain. The LATP and the polymer are connected through a chemical bond, so that discontinuous conduction of lithium ions caused by an organic-inorganic interface of a traditional composite electrolyte is improved. The introduction of LATP makes the electrolyte have good mechanical properties and thermal stability.

The invention relates to a preparation method of a low-cost and high-safety composite polymer solid electrolyte, and belongs to the technical field of sodium ion semi-solid / solid batteries. The traditional PVDF-based solid electrolyte has the problems of low room-temperature ionic conductivity, insufficient mechanical strength, high interface impedance and the like. The composite solid electrolyte with a three-dimensional interpenetrating network structure is constructed by uniformly dispersing nanocellulose in a PVDF (polyvinylidene fluoride) matrix and combining a solvent casting process. The mechanical strength and the thermal stability of the electrolyte are remarkably improved through the nanocellulose, the interfacial compatibility between the electrolyte and an electrode is effectively improved through the synergistic effect of the nanocellulose and the PVDF, the interface impedance is reduced, and meanwhile, the growth of sodium dendrites is effectively inhibited. The preparation process is simple, the raw materials are environment-friendly, and the obtained electrolyte has high ionic conductivity, excellent mechanical properties and interface stability, is suitable for all-solid-state sodium metal batteries with high energy density and high safety, and has wide application prospects in the fields of electric automobiles and energy storage.

The invention discloses a nanometer antiskid composite material and a preparation method thereof, and belongs to the technical field of antiskid materials. The nanometer antiskid composite material is prepared from the following raw materials in parts by mass: 90 to 110 parts of styrene-ethylene / butylene-styrene block copolymer, 25 to 35 parts of paraffin oil, 0.3 to 0.4 part of antioxidant 1010, 0.2 to 0.8 part of calcium stearate and 5 to 30 parts of nanometer filler, wherein the nanometer filler is carbon nanofiber or Mxene. A thermoplastic elastomer base material is subjected to compound modification by adopting a nanoscale filler, and the surface of the thermoplastic elastomer base material is subjected to damage treatment, so that the problem that in an existing ice surface anti-slip sole material, micron-sized fibers are lower than the base material in wear resistance and are easy to fall off in the wear process, and further the anti-slip performance is not lasting is solved.

The invention discloses a preparation method of a persistent radiation refrigeration film material, which comprises the following steps: preparing a composite polymer of PVDF-HFP and ZnO coated SiO2 nanoparticles, uniformly spraying the composite polymer on a film, and finally preparing the persistent radiation refrigeration film material. According to the PVDF-HFP porous structure prepared by the method, the reflectivity of the film is effectively improved, and an excellent cooling effect is realized. The introduced ZnO coated SiO2 nanoparticles can absorb high-energy ultraviolet photons and convert the high-energy ultraviolet photons into heat with small harm, so that the stability of ultraviolet rays is improved, and the film still keeps excellent cooling performance under long-term ultraviolet irradiation. Therefore, the problem that the radiation cooling performance of a radiation cooling material in the prior art is reduced due to the fact that the radiation cooling material is easily influenced by environmental aging, high temperature and ultraviolet irradiation is effectively solved, and the radiation cooling film has a more durable radiation cooling effect and a longer service life in an outdoor environment.

The invention belongs to the technical field of cosmetics, and particularly relates to a cosmetic delivery system based on a natural wall material, a preparation method and application. The cosmetic delivery system is of a core-shell structure, a core is a cosmetic active component, and a shell layer is a composite polymer gel network of sodium alginate, sophorolipid and cellulose. The natural polysaccharide composite wall material is green and safe, has good biocompatibility and strong compatibility with cosmetic formulas, and does not irritate the skin. The delivery system can effectively protect cosmetic active ingredients from being damaged by illumination and oxygen, and the storage stability of the active ingredients is remarkably improved; meanwhile, slow release and targeted transdermal absorption of active ingredients are realized, and the bioavailability is improved.

The embodiment of the invention provides an electrolyte and a preparation method thereof, a battery and a power utilization device. The electrolyte comprises a polymer electrolyte substrate, an inorganic additive and a functional additive, the functional additive can prevent the inorganic additive from physical agglomeration and chemical denaturation. In the embodiment of the invention, the functional additive is introduced into the composite polymer electrolyte of the polymer electrolyte substrate and the inorganic additive, and the functional additive can maintain the stability of the slurry, so that the physical agglomeration and chemical denaturation of the inorganic additive are prevented, and the problem of poor interface stability between the polymer and the inorganic additive is further improved.

The invention discloses a preparation method and application of an all-solid-state lithium-sulfur battery composite solid electrolyte, and belongs to the technical field of all-solid-state lithium-sulfur batteries. The preparation method comprises the following steps: firstly, preparing organic metal framework MOF particles with an ordered porous structure by adopting an oil bath method, taking polyethylene oxide as a substrate, adding an inorganic filler to prepare a composite polymer electrolyte membrane, and adding the MOF particles on the basis of the electrolyte membrane to prepare the composite solid electrolyte CPE-MOF. The MOF material prepared by the method shows a typical cubic structure, has a micron size, has good repeatability and controllability, and lays a solid foundation for research and application of subsequent material performance. The composite solid electrolyte prepared by the invention is applied to an all-solid-state lithium-sulfur battery, and shows relatively high specific discharge capacity, stable cycle performance and good rate capability.

The present application belongs to the technical field of polymer dielectric energy storage material, and discloses a preparation method of a full-organic small-molecule composite polymer film and a product. The preparation method comprises the following steps: mixing a mixed solution of PVDF and PMMA with a PE EU solution to form a pre-preparation solution; casting the pre-preparation solution on a substrate and heating and drying, and then heat treating in a vacuum environment to obtain the required composite polymer film. The present application also discloses the product prepared by the above preparation method. Through the present application, the problems of low discharge energy density and charge-discharge efficiency of ferroelectric-based polymer films are solved.

The present invention relates to the field of electrolytes for lithium-ion batteries. In a first aspect, the present invention concerns a lithium-ion battery comprising a composite polymer electrolyte, wherein the composite polymer electrolyte comprises a lithium salt, a polymer, and γ- LiAlO2 particles, wherein the average particle size of the γ-LiAlO2 particles is at least 2 μm, and wherein the polymer is selected from a polyether, polycarbonate, polyketone, polyester, polynitrile, copolymers thereof and / or a combination thereof. In a second aspect, the present invention concerns a solution comprising a solvent, a lithium salt, a polymer, and γ-LiAlO2 particles; wherein the average particle size of the γ-LiAlO2 particles is at least 2 μm, and wherein the polymer is selected from a polyether, polycarbonate, polyketone, polyester, polynitrile, copolymers thereof and / or a combination thereof.

The invention relates to a solid-state battery positive pole piece with a composite structure as well as a preparation method and application thereof. The solid-state battery positive pole piece comprises a current collector, a composite positive pole coating attached to the surface of one side of the current collector, and a composite polymer coating attached to the composite positive pole coating, the composite positive electrode coating comprises a positive electrode active material, a first oxyfluoride solid electrolyte, a binder and a conductive agent; the composite polymer coating comprises an in-situ polymerized polymer of a three-dimensional network structure, and a lithium salt and a second oxyfluoride solid electrolyte which are filled in gaps of the three-dimensional network structure; the polymer is formed by initiating in-situ polymerization of a polymer monomer through a thermal initiator; and a composite polymer coating is immersed in a gap of the composite positive electrode coating. The positive pole piece of the solid-state battery has high ionic conductivity, high interface stability and high mechanical reliability, and the cycle performance of the solid-state lithium battery can be improved when the positive pole piece is applied to the solid-state lithium battery.

The invention provides a solid electrolyte membrane and a preparation method thereof, a secondary battery and electric equipment. The solid electrolyte membrane comprises the following components: polyvinylidene fluoride or a copolymer thereof, polyimide or a copolymer thereof, electrolyte salt and amino polycarboxylic acid salt. The solid electrolyte membrane is prepared by taking polyvinylidene fluoride or a copolymer thereof as a matrix, and polyimide and amino polycarboxylate are added to improve the crystallization property of polyvinylidene fluoride, so that the compact flame-retardant composite polymer electrolyte membrane with high Young's modulus is obtained. The Young modulus of the prepared solid electrolyte membrane is larger than or equal to 9.5 GPa under the thickness of 10 microns, the ionic conductivity is larger than 4 * 10 <-4 > S / cm at the temperature of 25 DEG C, and the capacity retention ratio is 85% or above after 600 cycles at the temperature of 1 DEG C.

The invention discloses a formula and application of a long-acting high-molecular polymer dust suppressant, and relates to the field of dust treatment. The long-acting high-molecular polymer dust suppressant comprises the following components: 5%-15% of a composite high-molecular polymer emulsion, 0.5%-3% of an environment-responsive polymer, 0.1%-1.5% of a nano reinforcing material, 0.2%-2% of a bio-based water-retaining agent, 0.05%-0.3% of a crosslinking catalyst and the balance of water. Through the synergistic effect of the composite high-molecular polymer emulsion, the environment-responsive polymer, the nano reinforcing material, the bio-based water-retaining agent and the cross-linking catalyst, a three-layer composite structure is formed, and the environment-friendly dust suppression agent has the advantages of long-acting stable dust suppression, high environmental adaptability, ecological friendliness, restoration function, integration of multiple functions, adaptation to multiple scenes and the like; the defects in the prior art can be effectively overcome.

The invention discloses a composite polymer electrolyte based on surface organic modified lithium titanium aluminum phosphate as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The preparation method of the composite polymer electrolyte based on the surface organic modified titanium aluminum lithium phosphate comprises the following steps: in an inert atmosphere, mixing a polymer monomer, a lithium salt, an organic solvent and silane coupling agent modified titanium aluminum lithium phosphate, and carrying out cross-linking curing to obtain the composite polymer electrolyte based on the surface organic modified titanium aluminum lithium phosphate. Reaction sites dispersed in a polymer chain react with modified LATP surface groups, so that modified LATP particles are uniformly dispersed along the polymer chain, and a compact network structure is formed. The modified LATP and the polymer are tightly connected through a chemical bond, so that discontinuous lithium ion transmission caused by poor contact of an organic-inorganic interface of a traditional composite electrolyte is improved. The introduction of LATP makes the electrolyte have good mechanical properties and thermal stability.

The invention relates to an in-situ polymerization dioxolame polymer solid electrolyte, a magnesium fluoride-containing interface layer, a battery and a preparation method thereof, 1, 3-dioxolame, a lithium salt and magnesium-containing montmorillonite are uniformly mixed to obtain a mixed solution, then the mixed solution is immersed into a support body, the support body, a lithium metal negative electrode and a lithium metal positive electrode are matched and assembled into a total battery, and the total battery is obtained after standing for a period of time. And preparing the polymerized dioxolame composite polymer solid electrolyte through an in-situ polymerization reaction. Magnesium ions spontaneously gathered on the surface of montmorillonite compete for coordination with lithium salt anions, the lithium ion coordination environment in the electrolyte is regulated and controlled, and the number of free lithium ions is increased, so that the ionic conductivity of the electrolyte is improved. Besides, magnesium ions and lithium salt anion ligands are decomposed on a positive and negative electrode interface to participate in formation of an interface layer, inorganic-unit-rich interface layers (CEI and SEI) containing magnesium fluoride are generated, high Young modulus and rapid lithium ion transportation kinematics are achieved, rapid transportation of lithium ions is facilitated, stability of the electrolyte and the positive and negative electrode interface is improved, and good application prospects are shown.

The invention discloses a porous composite polymer solid electrolyte, a preparation method thereof and a solid sodium ion battery. The porous composite polymer solid electrolyte is prepared from a deep eutectic solvent, an additive, a polymer solution and a sodium super-ion conductor, the deep eutectic solvent is composed of a sodium ion-containing hydrogen bond receptor and a hydrogen bond donor, wherein the sodium ion-containing hydrogen bond receptor is selected from any one of sodium hexafluorophosphate, sodium tetrafluoroborate, sodium bis (oxalato) borate, sodium difluoro (oxalato) borate, sodium bis (trifluoromethanesulfonyl) imide, sodium bis (fluorosulfonyl) imide, sodium perchlorate, sodium nitrate, sodium chloride and sodium difluorophosphate; the additives are ethylene carbonate and propylene carbonate; the polymer solution is composed of a polymer and an organic solvent; the mass ratio of the sodium super-ion conductor to the polymer is 1: (2-5). The porous composite polymer solid electrolyte disclosed by the invention has excellent ionic conductivity and flame retardance, relatively strong mechanical property and excellent safety.

The invention discloses a multistage crosslinking formaldehyde-free adhesive with a three-dimensional network structure and a preparation method of the multistage crosslinking formaldehyde-free adhesive, and belongs to the technical field of high-molecular polymers. The environment-friendly formaldehyde-free adhesive is successfully prepared through the precise molecular structure design and the synergistic effect of the components, has high bonding strength, controllable viscosity, excellent water resistance, mildew resistance and flame retardance, is formaldehyde-free and environment-friendly, can effectively achieve bonding of various materials such as wood, paper and fiber products, and has the advantages of being high in adhesive strength, capable of controlling the viscosity and good in flame retardance. The application field is widened, the adhesive is endowed with good weather resistance and flame retardance due to unique composite polymer components and a cross-linked structure, the adhesive can still keep a stable bonding effect in a humid environment and under different weather conditions, the service life of a bonded product is remarkably prolonged, and the application range of the adhesive is widened. And meanwhile, powerful guarantee is provided for home safety by virtue of excellent flame retardant property.

The invention provides a method for removing phosphorus from a cobalt sulfate solution. The method comprises the following steps: providing a cobaltous sulfate solution to be treated; the method comprises the following steps: mixing a to-be-treated cobaltous sulfate solution, a composite polymer soluble ferric salt and a coagulant aid, carrying out precipitation reaction, and separating to obtain phosphorus-containing slag and cobaltous sulfate primary purified liquid; a deep phosphorus removal adsorbent is adopted to adsorb trace phosphorus in the cobalt sulfate primary purification liquid, then trace iron in the cobalt sulfate primary purification liquid generates precipitates in an oxygen-containing atmosphere, and after separation, a cobalt sulfate secondary purification liquid is obtained. According to the method, firstly, the synergistic effect of the composite polymer soluble ferric salt and the coagulant aid is adopted, and primary efficient removal of phosphorus is achieved; then, a deep phosphorus removal adsorbent is used for directionally adsorbing trace phosphorus in the cobalt sulfate primary purification liquid, so that deep removal of phosphorus is further realized; and finally, the residual trace iron is precipitated and separated in the oxygen-containing atmosphere, so that the purity of the secondary purified cobalt sulfate liquid is further guaranteed.

The invention discloses a PVDF / PI-based ultrathin composite electrolyte membrane and a preparation method and application thereof, and belongs to the field of lithium ion solid electrolytes.The preparation method comprises the steps that a PVDF / PI porous membrane is prepared through a non-solvent phase inversion method, after the membrane is immersed in lithium salt, a large number of regular holes are formed in the surface of the membrane in combination with a hot stamping technology, formula slurry of PVDF / inorganic solid electrolyte is coated, and the PVDF / PI-based ultrathin composite electrolyte membrane is obtained. And obtaining the composite electrolyte membrane. According to the PVDF / PI composite polymer electrolyte membrane prepared by the invention, the mechanical strength of a solid electrolyte membrane is improved to a great extent, the crystallization of PVDF is further destroyed, and the ionic conductivity of the solid electrolyte is improved; the thickness of the electrolyte membrane is controllable, the electrolyte membrane is ultrathin, the preparation process is simple, the cost is relatively low, and the electrolyte membrane has a very good application prospect in all-solid-state lithium ion batteries.