30results about How to "Improve chain movement ability" patented technology

The invention provides a composite solid electrolyte, and can solve the problem that the interface of inorganic solid electrolyte and metallic lithium in a solid battery is unstable and low in contact. The composite solid electrolyte is an inorganic oxide electrolyte plate modified with a mixture electrolyte layer used for a surface, and the mixture electrolyte layer is a mixture of a polymer matrix, an alkali metal salt and a sulfide. The invention also provides a preparation method of the composite solid electrolyte, the composite solid electrolyte stable for the metallic lithium can be obtained, and the production cost is reduced.

The invention discloses a zwitter-ion-containing all-solid-state polymer electrolyte membrane, and a preparation method and use thereof. An all-solid-state polymer electrolyte disclosed by the invention is prepared from poly(methyl hydrogen silicomethane), N,N-dimethylallylamine, allyl capped polyether, 1,3-propyl sultone, lithium salt and a cross-linking agent. The preparation method comprises the following steps of: sufficiently mixing PHMS, PEO with DMAA in methylbenzene, and reacting by adding a chloroplatinic acid catalyst; reacting a prepared product with 1,3-PS again; and, mixing the lithium salt and the cross-linking agent in the reacted product in an acetonitrile solvent, crosslinking and forming a membrane in a vacuum oven after sufficiently stirring, and then, obtaining the zwitter-ion-containing all-solid-state polymer electrolyte membrane. The conductivity of the zwitter-ion-containing all-solid-state polymer electrolyte disclosed by the invention is greatly increased; the conductivity is up to 3.39*10<-4>Scm<-1>; an electrochemical window is beyond 5 V; and thus, the zwitter-ion-containing all-solid-state polymer electrolyte can be used for a lithium secondary battery.

The invention provides a compound polymer electrolyte material, a preparation method thereof, an electrolyte membrane and an all-solid-state lithium secondary battery. The electrolyte material is prepared from a polymer matrix, alkali metal salt and sulfide inorganic electrolyte. The sulfide inorganic electrolyte is prepared from lithium-ion conductors with the general formulas in formula I(Li4-x1Ge1-x1Px1S4), the formula II (Li10+x2G1+x2P2-x2S12) and the formula III (Li3+5x3P1-x3S4) or Li2S-M type lithium-ion conductors. In the formula I, x1 is larger than 0 and smaller than 1; in the formula II, x2 is equal to 0 or 1, and G is selected from Si, Ge or Sn; in the formula III, x3 is larger than 3 and smaller than 0.27. M is selected from the compound of P2S5 and D. D is selected from one or more of LiI, Li3PO4, Li4SiO4, P2O5 and P2S3. The compound polymer electrolyte material has high lithium stability, an electromechanical window and high electric conductivity.

The invention discloses a preparation method for a modified graphene oxide-doped solid polymer electrolyte. The preparation method specifically comprises the steps of doping the prepared modified graphene oxide into a mixed solution of polyoxyethylene and polyvinyl alcohol, then adding a perchloric acid lithium salt, performing a solution casting method, pouring the mixed solution into a polytetrafluoroethylene die, and drying the solvent at a normal temperature and in a vacuum drying oven to obtain a polymer electrolyte film. The prepared polymer electrolyte, due to the existence of ether oxygen bonds on the modified graphene oxide, can promote dissociation of the lithium salt and improve ionic conductivity of the polymer electrolyte; meanwhile, the crystalline region of polyoxyethylene can be suppressed by polyvinyl alcohol while the mechanical strength and ionic conductivity of the polymer electrolyte can be strengthened; and the prepared polymer electrolyte has relatively high ionic conductivity, relatively high mechanical strength and high safety performance.

The invention provides a metal pigment pretreatment method. The metal pigment pretreatment method comprises the following steps: metal pigment degreasing treatment: soaking the metal pigment into an alkaline aqueous solution to carry out degreasing treatment; acid treatment: soaking the degreased metal pigment into an acidic aqueous solution to carry out acid treatment, and eroding out nano-scale pits in the surface of the metal pigment by the acidic aqueous solution; pretreatment solution treatment: soaking the metal pigment subjected to the acid treatment into the pretreatment solution for treatment, so that the surface of the metal pigment has an amine treating agent, wherein the pretreatment solution is an aqueous solution of one or several of ammonia, hydrazine, a hydrazine derivative and water-soluble amine series compounds; and drying the metal pigment. The metal pigment pretreatment method has the advantages that the nano-scale pits are formed in the surface of the metal pigment; the pretreatment solution is adopted to treat the surface of the metal pigment with the nano-scale pits, so that the surfaces of the metal pigment nano-scale pits have the amine treating agent; and by virtue of the chemical reaction between reaction radials such as an epoxy group of a compatilizer, an ester group of PC and the like and amine, the resin is driven to enter the pits better.

The invention discloses a preparation method of a low-density high-foaming-rate epoxy resin microporous material, and the method is used for solving the technical problems of low expansion magnification and high foam density of an epoxy resin microporous material prepared by an existing preparation method of an epoxy resin microporous material. According to the technical scheme, bisphenol A epoxyresin and hyperbranched epoxy resin are used as basic materials, polyether amine and 3-glycidyl oxypropyl trimethyl siloxane reactants are used as modifiers, and 2-ethyl-4-methylimidazole is taken asa curing agent, so that the low-density high-foaming-ratio epoxy resin microporous material with a uniform structure and a microporous structure is prepared by mixing the raw materials through a solvent method, carrying out hot-pressing curing molding, carrying out supercritical CO2 gas saturation in a high-pressure kettle, and carrying out subsequent heating and foaming.

The present invention discloses a solid polymer electrolyte and a preparation method thereof. The electrolyte includes the following components in parts by weight: 1 part of nitrile rubber, 0.02-0.8 part of octa-(polyethylene glycol)-polyhedral oligomericsilsesquioxane, and 0.1-3 parts of lithium salt. The preparation method includes the steps of providing a solvent dissolving the nitrile rubber, wherein every 1g of nitrile rubber is corresponding to 15ml-25ml solvent; adding the nitrile rubber into the solvent, and stirring at normal temperature till totally dissolving the nitrile rubber, so as to obtain a nitrile rubber solution; adding the lithium salt into the nitrile rubber solution, continuing to stir at normal temperature till totally dissolving the lithium salt, so as to obtain a primary mixed solution; dropping the octa-(polyethylene glycol)-polyhedral oligomericsilsesquioxane into the primary mixed solution, stirring till dissolving, so as to obtain a secondary mixed solution; and volatilizing the solvent in the secondary mixed solution in a vacuum oven till obtaining a constant weight, so as to obtain the solid polymer electrolyte. The solid polymer electrolyte has high conductivity and good mechanical performance.

The invention discloses an organic coating layer, an electrode material containing the coating layer and a lithium ion battery. The electrode coating layer is a polymer coating layer, and the polymer is obtained by polymerizing a composition comprising the following components: polyester polyol, polysiloxane, electrolyte salt, diisocyanate, an additive, a chain extender and metal chloride. The coating layer provided by the invention has crosslinking sites capable of crosslinking amorphous polymer blocks and also comprises dynamic acting forces such as hydrogen bonds and coordinate bonds, so that the tear resistance of the polymer material can be remarkably improved, the strength, ductility and toughness of the elastomer material are also remarkably improved, and the self-repairing function is realized; therefore, the generation of interface side reaction and electrode expansion can be well inhibited, and the cycle performance of the battery is improved. And meanwhile, the polymer in the coating layer can also form a synergistic effect with the lithium salt, so that the electrode has excellent ionic conductivity, and the lithium ion conductivity at an interface is further improved.

The invention provides an unsaturated sulfur-containing composite electrolyte and a preparation method thereof; the unsaturated sulfur-containing composite electrolyte comprises an unsaturated solublesulfide electrolyte as the general formula I, a polymer matrix and a lithium salt; in Li3-xPS4 in formula I, x is greater than 0 and less than 3; the polymer electrolyte comprises a polymer matrix and a lithium salt, wherein the polymer matrix is one or more of polyoxyethylene, polyether, polyvinylidene fluoride, polymethyl methacrylate and polyacrylonitrile. In the composite electrolyte, the unsaturated soluble sulfide electrolyte with the general formula I and the polymer matrix can be mixed uniformly in the level of atoms / molecules, so that the contact area is large, the crystallinity of the polymer matrix is inhibited, the chain segment movement capability of the polymer matrix is improved, and the carrier concentration is increased; and the electrical conductivity of the unsaturatedsoluble sulfide electrolyte is increased, so that the composite electrolyte has relatively high electrical conductivity, relatively high electrochemical stability and a potential window.

The invention relates to the technical field of chemical materials, in particular to environment-friendly elastic putty and a preparation method thereof.According to the environment-friendly elastic putty, polyether polyol resin and asparaginic acid resin are synergistically compounded, system crosslinking is increased by adding a nanometer reinforcing material, an MDI curing agent and an HDI polyisocyanate curing agent are compounded, and the environment-friendly elastic putty is prepared. The environment-friendly elastic putty is obtained by using an environment-friendly and safe organic bismuth catalyst and adding appropriate pigments and fillers, the putty does not contain toxic organic tin components, the adhesive force of the putty on a blade base material can reach 10 MPa or above, and the impact resistance is gt; the thickness is 100 cm, and the bending resistance is 1t; the putty has the advantages that the thickness is 1 mm, the solid content is 99% or above, the construction time is as long as 8 hours or above, the curing time can be flexibly adjusted by utilizing the catalyst, the polishing is convenient and quick, the construction efficiency is high, and the use requirement of the fan blade putty is met.

The invention relates to a lithium silicate modified solid polymer electrolyte material and a preparation method thereof. The lithium silicate modified solid polymer electrolyte is prepared by selecting lithium silicate as modified filler of the polymer solid electrolyte, polyepoxyethylene as a matrix and lithium perchlorate or lithium bis(trifluoromethanesulfonyl)imide as a lithium salt through asolution casting method. The introduced lithium silicate is decomposed to form amorphous silicon dioxide and lithium oxide which can be used as the electrolyte modified filler, and thereby great contribution to improvement of performance of the electrolyte is achieved. The modified solid polymer electrolyte prepared by the method has good ionic conductivity, electrochemical stability and thermalstability, is suitable for a lithium ion battery under certain conditions, and can greatly improve safety performance.

The invention discloses a cross-linked polymer solid state electrolyte, the raw materials of which include modified polyethyleneimine, cross-linking agent and lithium salt, and the modified polyethyleneimine, cross-linking agent and lithium salt are heated and cross-linked It forms an interpenetrating network material; it has higher thermal stability, ionic conductivity and electrochemical window, and can be widely used in electrochemical energy storage devices such as lithium-ion batteries, supercapacitors or solar cells.

The invention discloses a preparation method of a high-temperature resistant solid-state polymer electrolyte and application of same in a lithium battery. The preparation method of the high-temperature resistant solid-state polymer electrolyte at least comprises the steps of uniformly mixing two or more polymer monomers, a conductive salt and an initiator on a molecular level to form a precursor solution according to a certain proportion, coating the precursor solution on a surface of a substrate or an electrode, and preparing the solid-state polymer electrolyte by a polymerization method. The electrolyte is directly assembled into the battery, and the battery can work in a room temperature and a high temperature. The method has the advantages of high controllability, convenience in operation, low cost and favorable application prospect. The mechanical property and the thermal stability of the polymer electrolyte obtained according to the method are maintained very well, meanwhile, the moving ability and the ionic conductivity of a polymer chain segment are improved, and thus, a synergetic enhancement effect is achieved.

The invention provides an unsaturated sulfur-containing composite electrolyte and a preparation method thereof. The unsaturated sulfur-containing composite electrolyte includes an unsaturated soluble sulfide electrolyte of the general formula shown in formula I, a polymer matrix and a lithium salt; Li 3‑x P.S. 4 , Formula I, where 0

The present invention discloses a solid polymer electrolyte and a preparation method thereof. The electrolyte includes the following components in parts by weight: 1 part of nitrile rubber, 0.02-0.8 part of octa-(polyethylene glycol)-polyhedral oligomericsilsesquioxane, and 0.1-3 parts of lithium salt. The preparation method includes the steps of providing a solvent dissolving the nitrile rubber, wherein every 1g of nitrile rubber is corresponding to 15ml-25ml solvent; adding the nitrile rubber into the solvent, and stirring at normal temperature till totally dissolving the nitrile rubber, so as to obtain a nitrile rubber solution; adding the lithium salt into the nitrile rubber solution, continuing to stir at normal temperature till totally dissolving the lithium salt, so as to obtain a primary mixed solution; dropping the octa-(polyethylene glycol)-polyhedral oligomericsilsesquioxane into the primary mixed solution, stirring till dissolving, so as to obtain a secondary mixed solution; and volatilizing the solvent in the secondary mixed solution in a vacuum oven till obtaining a constant weight, so as to obtain the solid polymer electrolyte. The solid polymer electrolyte has high conductivity and good mechanical performance.

The invention discloses a solid-state electrolyte and a solid-state battery containing the solid-state electrolyte. The solid-state electrolyte is a polymer solid-state electrolyte, and the polymer is obtained by polymerizing a composition comprising the following components: polyester polyol, polysiloxane, electrolyte salt, diisocyanate, an additive, a chain extender and metal chloride. The solid electrolyte disclosed by the invention has excellent chain segment movement capability and rich lithium ion migration sites, cannot be broken under relatively large stress in a circulation process, and can be self-healed even after being broken under limiting conditions. The excellent tear resistance of the solid electrolyte elastomer is derived from a strong and tough dynamic microphase separation structure formed in the solid electrolyte elastomer, and meanwhile, the solid electrolyte also has rigidity and certain elasticity, so that the problem of electrode expansion of the solid battery in the circulating process can be effectively inhibited; and the safety performance of the battery is further improved.

The invention discloses a preparation method and application of a modified polysiloxane-based solid electrolyte membrane (SPE). In the present invention, SPE is made of poly(methylhydrogensilane) (PMHS), cyanoimidazolium ionic liquid (IL-CN), allyl-terminated polyether (PEO), lithium salt and crosslinking agent. The preparation method of the present invention is as follows: 1, PMHS, PEO, IL-CN are fully mixed in anhydrous toluene, add chloroplatinic acid catalyst, react for an appropriate time at a certain temperature; 2, the product in step 1 is dissolved in anhydrous acetonitrile Mix an appropriate amount of lithium salt, cross-linking agent and catalyst into the mixture, pour the solution into a polytetrafluoroethylene mold after stirring well, heat and cross-link and solidify in a vacuum oven, and obtain an all-solid polymer electrolyte membrane. The obtained electrolyte has high electrical conductivity, wide electrochemical stability window and high stability, and can be used in lithium secondary batteries.

The invention discloses a carboxylate / phosphate dual dynamic covalent polymer network material and a preparation method thereof. The preparation method comprises the following steps: carrying out pre-reaction on a uniformly mixed reaction system of cyclic anhydride containing a long-chain side group, an epoxy monomer and a compound containing a phosphate group, and then carrying out curing reaction to obtain the carboxylate / phosphate dual dynamic covalent polymer network material. The carboxylate / phosphate dual dynamic covalent polymer network material prepared by the invention not only has excellent thermal, mechanical, intrinsic flame retardant and degradation properties, but also can realize autocatalytic rapid remodeling processing; and meanwhile, the preparation process is simple, operability is high, industrial production is easy to achieve, the problems that existing epoxy resin is inflammable and difficult to degrade are hopefully solved, and the problem that improvement of thermal and mechanical properties and acceleration of the autocatalytic remodeling rate contradict is solved.

The invention provides a preparation method of a polyurethane-based composite electrolyte membrane and a polyurethane-based composite electrolyte membrane. The preparation method of the polyurethane-based composite electrolyte membrane comprises a uniform mixing and dispersing step, a melt-blowing step and a hot roller pressurizing step. According to the uniform mixing and dispersing step,a polyurethane-polysiloxane block copolymer and a lithium salt are mixed and dispersed, heating is performed to obtain a lithium salt mixture. According to the melt-blowing step, the lithium salt mixture and reinforced fibers are simultaneously mixed and interwoven by adopting a melt-blowing process, and then an obtained product sets on a receiving device to form a composite fiber non-woven fabric; According to the hot roller pressurization step, hot roller pressurization is carried out on the composite fiber non-woven fabric to obtain the polyurethane-based composite electrolyte membrane.

The invention belongs to the technical field of polymer electrolytes, and discloses a polymer electrolyte based on boric acid ester exchange reaction and a preparation method and application thereof.The polymer electrolyte comprises a main chain component, a side chain component and a lithium salt component, a side chain of the copolymer is a polyethylene glycol-polypropylene glycol boric acid side chain, and the polyethylene glycol-polypropylene glycol boric acid side chain can be subjected to reversible exchange reaction with two adjacent hydroxyl groups in a main chain of the copolymer; by utilizing the side chain, the movement capability of the chain segment in the polymer electrolyte can be improved, so that the conductivity of the polymer electrolyte is improved. According to the invention, the dynamic exchange reaction between boric acid ester and two adjacent hydroxyl groups on a main chain is utilized, so that the movement capability of a chain segment in the polymer electrolyte is improved, and the complexing and dissociation processes of a polyoxyethylene chain segment and lithium ions are accelerated, so that the ionic conductivity of the electrolyte is effectively improved.

The invention provides a composite solid electrolyte, and can solve the problem that the interface of inorganic solid electrolyte and metallic lithium in a solid battery is unstable and low in contact. The composite solid electrolyte is an inorganic oxide electrolyte plate modified with a mixture electrolyte layer used for a surface, and the mixture electrolyte layer is a mixture of a polymer matrix, an alkali metal salt and a sulfide. The invention also provides a preparation method of the composite solid electrolyte, the composite solid electrolyte stable for the metallic lithium can be obtained, and the production cost is reduced.

The invention discloses an electrolyte membrane containing a zwitterionic all-solid polymer, a preparation method and application thereof. The all-solid polymer electrolyte of the present invention consists of poly(methylhydrogensilane), N,N-dimethylallylamine, allyl-terminated polyether, 1,3-propyl sultone, lithium salt and cross-linking agent. Fully mix PMHS, PEO, DMAA in toluene, add chloroplatinic acid catalyst to react; the prepared product is then reacted with 1,3-PS; the product of the above reaction is mixed with lithium salt and cross-linking agent in acetonitrile solvent, and fully stirred The film is cross-linked in a vacuum oven to obtain an all-solid-state polymer electrolyte membrane containing zwitterions. The conductivity of the all-solid polymer electrolyte containing zwitterions of the present invention is greatly improved, reaching 3.39×10-4S·cm-1 at room temperature, and the electrochemical window exceeds 5V, which can be used in lithium secondary batteries.

The invention provides a seawater-resistant oil-resistant elastic epoxy ballast tank coating. Dimer acid epoxy resin is introduced into an epoxy coating mainly comprising a bisphenol A resin structure, and the epoxy ballast tank coating with excellent comprehensive performance is obtained by utilizing the synergistic curing effect of a curing agent. The coating comprises a component A and a component B. The component A consists of the following components in percentage by mass: 10.5-15% of dimer acid modified epoxy resin; 15-24% of epoxy resin; 5-15% of self-made aluminum paste; 30-50% of feldspar powder; 5-10% of talcum powder; 0.1-1.0% of a defoaming agent; 0.5-1.5% of an anti-sagging agent; 0.3-1.5% of an anti-settling agent; 5-12% of a xylene solvent; and 0.5-1.5% of benzyl alcohol. The component B is composed of the following raw materials in percentage by mass: 90-95% of curing agent; and 5-10% of a xylene solvent. The component A and the component B are proportioned according to a mass ratio of (8-10):1 when in use.

The invention discloses a composite electrolyte membrane and a preparation method and application thereof. The composite electrolyte membrane is a gel-state composite electrolyte membrane or a solid-state composite electrolyte membrane. The preparation method of the composite electrolyte membrane comprises the following steps of adding a macromolecular polymer material into an organic solvent, and performing stirring to obtain a macromolecular polymer material solution; and adding inertia inorganic solid filler and / or active inorganic solid filler, a lithium salt and an ionic liquid, and performing ultrasonic dispersion, stirring, standing and drying to obtain the composite electrolyte membrane. The composite electrolyte membrane has the advantages of high thermal stability, high electrochemical stability, good ionic conductivity, good interface adhesion tightness and the like, is easy to form and can be completely in contact with an electrode material; the preparation method has the advantages of simple process and the like, continuous production can be achieved; and the composite electrolyte membrane can be applied to a solid-state battery, and the solid-state battery shows relatively good cycle stability and rate performance.

The solid polymer electrolyte membrane is prepared from the following components in parts by weight: 800 to 1200 parts of a rubber material, 800 to 1200 parts of an operation aid, 400 to 600 parts of filler, 400 to 600 parts of lithium salt, 0.1 to 3 parts of ZnO, 0.01 to 0.5 part of stearic acid, 0.1 to 3 parts of a vulcanizing agent and 2 to 8 parts of an accelerant, the vulcanizing agent comprises sulfur and / or a sulfur donor. Correspondingly, the invention also provides a preparation method of the solid polymer electrolyte membrane, and the solid polymer electrolyte membrane is high in mechanical strength, good in heat resistance and high in ionic conductivity.

The invention relates to a metal organic framework material modified PEO-based fire safety type solid polymer electrolyte and a preparation method thereof. The metal organic framework material is usedas a polymer solid electrolyte, polyepoxyethylene and lithium bis (trifluoromethanesulfonyl) imide, and the metal organic framework material modified fire safety type solid polymer electrolyte is prepared through a solution casting method. And the introduced metal organic framework material further releases more lithium ions capable of being freely conducted, so that a great contribution is madeto the improvement of the electrochemical performance of the electrolyte. Meanwhile, due to the unique catalytic property of the metal organic framework material, the formation of a carbon layer can be catalyzed and protected in the combustion process of the polymer, and further combustion is inhibited, so that the fire safety is improved. The modified solid polymer electrolyte prepared by the method has good ionic conductivity, electrochemical stability and thermal stability, is suitable for a lithium ion battery under certain conditions, and can greatly improve the safety performance.

The invention discloses a method for preparing a low-density and high-magnification epoxy resin microporous material, which is used to solve the problems of low expansion ratio and high foam density of the epoxy resin microporous material prepared by the existing epoxy resin microporous material preparation method question. The technical scheme is that the method takes bisphenol A type epoxy resin and hyperbranched epoxy resin as basic materials, and polyether amine and 3-glycidyloxypropyl trimethylsiloxane reactant as modifier, 2-ethyl-4-methylimidazole is used as a curing agent, mixed by solvent method, hot-pressed and cured, supercritical CO in an autoclave 2 The gas is saturated, followed by heating and foaming, and a low-density and high-expansion ratio epoxy resin microporous material with a uniform structure and a microporous structure is prepared.

The invention discloses a gel polymer electrolyte doped with modified particles, a preparation method and application thereof in an electrochromic device. The preparation method comprises the following steps of: (1) dissolving a polymer matrix and a lithium salt in a mixed solution of a plasticizer and a solvent, and continuously stirring at 45-55 DEG C, the polymer matrix being one of polyvinylidene fluoride-hexafluoropropylene, polymethyl methacrylate and polyvinylidene fluoride, (2) adding modified inorganic powder into the solution obtained in the step (1), and continuously stirring for 1-3 hours to form viscous sol, the addition amount of the modified inorganic powder being 3wt%-25wt% based on the total mass of the polymer matrix and the lithium salt being 100%, the modified inorganicpowder being silicon dioxide or titanium dioxide, and the surface being coated with a PMMA layer, and (3) pouring the sol obtained in the step (2) into a mold, and drying at 55-65 DEG C to obtain thegel polymer electrolyte doped with the modified particles.

The invention provides a metal pigment pretreatment method. The metal pigment pretreatment method comprises the following steps: metal pigment degreasing treatment: soaking the metal pigment into an alkaline aqueous solution to carry out degreasing treatment; acid treatment: soaking the degreased metal pigment into an acidic aqueous solution to carry out acid treatment, and eroding out nano-scale pits in the surface of the metal pigment by the acidic aqueous solution; pretreatment solution treatment: soaking the metal pigment subjected to the acid treatment into the pretreatment solution for treatment, so that the surface of the metal pigment has an amine treating agent, wherein the pretreatment solution is an aqueous solution of one or several of ammonia, hydrazine, a hydrazine derivative and water-soluble amine series compounds; and drying the metal pigment. The metal pigment pretreatment method has the advantages that the nano-scale pits are formed in the surface of the metal pigment; the pretreatment solution is adopted to treat the surface of the metal pigment with the nano-scale pits, so that the surfaces of the metal pigment nano-scale pits have the amine treating agent; and by virtue of the chemical reaction between reaction radials such as an epoxy group of a compatilizer, an ester group of PC and the like and amine, the resin is driven to enter the pits better.

The invention provides a preparation method of a polyurethane-based composite electrolyte membrane and a polyurethane-based composite electrolyte membrane. The preparation method of the polyurethane-based composite electrolyte membrane includes a mixing and dispersing step, a melt-blowing step and a hot roller pressing step. Mixing and dispersing step: mixing and dispersing the polyurethane-polysiloxane block copolymer and lithium salt and heating to obtain a lithium salt mixture; melt blowing step: using a melt blowing process to mix and interweave the lithium salt mixture and the reinforcing fibers at the same time, and then settle The composite fiber non-woven fabric is formed on the receiving device; the hot roller pressing step: the composite fiber non-woven fabric is heated and pressed to obtain a polyurethane-based composite electrolyte membrane.