498 results about "Hexafluoropropylene" patented technology

The invention discloses a lithium ion battery composite diaphragm, a preparation method and a lithium ion battery, and relates to the technical field of lithium ion batteries. The lithium ion battery composite diaphragm comprises a base membrane and a functional coating arranged on the negative electrode side of the base membrane, the functional coating sequentially comprises an ion conducting layer, a thermal barrier layer and a self-repairing layer from the position close to the base film to the position far away from the base film; wherein the base membrane is a polyimide and aramid nanofiber blended electrostatic spinning membrane; the ion conducting layer comprises a compound of a modified fast ion conductor and polyvinylidene fluoride-hexafluoropropylene; the thermal barrier layer comprises a cross-linked network of boron nitride nanosheets and polybenzimidazole; the self-repairing layer comprises polyurethane microspheres loaded with dynamic disulfide bonds. The composite diaphragm provided by the invention can remarkably inhibit a purple area on the surface of a negative electrode, and enhance high-temperature self-protection and interface self-repairing of the lithium ion battery, so that the cycle and safety performance of the lithium ion battery are remarkably improved.

The invention belongs to the technical field of lithium battery materials, and particularly relates to an integrated positive electrode / solid-state electrolyte sheet, a preparation method thereof and application of the integrated positive electrode / solid-state electrolyte sheet in a solid-state lithium battery. When the integrated positive electrode / solid electrolyte sheet provided by the invention is prepared, polyvinylidene fluoride-hexafluoropropylene is used as a flexible framework, poly (1, 3-dioxolame) is used as an additive, and an ionic liquid is used as an ionic conductor, solid electrolyte slurry is prepared by mixing, then the slurry is directly coated on the positive electrode sheet, and the integrated positive electrode / solid electrolyte sheet is obtained. The thickness of the solid-state electrolyte layer in the obtained integrated positive electrode / solid-state electrolyte sheet is less than 20 [mu] m, so that the requirement on high energy density of a solid-state lithium battery in industry is met. Meanwhile, the integrated positive electrode / solid-state electrolyte sheet can be randomly bent under the condition of keeping high ionic conductivity and mechanical modulus, so that the solid-state lithium battery assembled by adopting the electrolyte sheet at room temperature has higher specific capacity and good cycling stability, and has good popularization and application prospects in high-energy-storage lithium batteries.

The invention provides a high-temperature-resistant fast-charging PVDF-HFP-based all-solid-state electrolyte membrane as well as a preparation method and application thereof, and relates to the technical field of power batteries. The preparation method comprises the following steps: uniformly mixing a polyvinylidene fluoride-hexafluoropropylene copolymer, a lithium salt and a polar solvent to obtain a PVDF-HFP solution; then uniformly mixing the PVDF-HFP solution with a cross-linking agent and a 2, 2-bis (4-allyloxy-3, 5-dibromophenyl) propane monomer, so as to obtain a precursor solution; uniformly mixing an initiator with the precursor solution to obtain a reaction solution; and finally, coating a substrate with the reaction solution, and heating at 70-80 DEG C for 12-16 hours to obtain the high-temperature-resistant fast-charging PVDF-HFP-based all-solid-state electrolyte membrane. When the high-temperature-resistant and fast-charging PVDF-HFP-based all-solid-state electrolyte membrane is applied to a lithium metal battery, the thermal safety and the high-temperature-resistant and fast-charging performance can be remarkably improved.

The invention discloses a preparation method and application of a composite PVDF-HFP and polylysine nanofiber diaphragm, and belongs to the technical field of lithium batteries. The composite material is prepared by blending polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) and polylysine and then carrying out an electrostatic spinning process. The PVDF-HFP is utilized to provide excellent mechanical strength and chemical stability, rich polar amino functional groups in a polylysine molecular chain are utilized to improve the lyophilic property of the membrane, and anions in an electrolyte are fixed through an intermolecular acting force, so that the transference number of lithium ions is increased, and the lithium ions are induced to be uniformly deposited. The nanofiber membrane combines the characteristics of PVDF-HFP and polylysine, has high porosity, good thermal stability and excellent interface compatibility, can effectively inhibit the growth of lithium dendrites and prevent the diaphragm from being punctured, and can significantly prolong the cycle life and improve the safety performance of the lithium metal battery when being applied to the lithium metal battery.

The invention relates to the technical field of inorganic material preparation and new energy materials, and particularly discloses a lithium metal battery composite solid electrolyte as well as a preparation method and application thereof. Lithium niobate with high lithium ion conductivity and high dielectric constant is used as an inorganic filler, polyvinylidene fluoride-co-hexafluoropropylene is used as a polymer matrix, and the lithium metal battery composite solid electrolyte is prepared. The lithium metal battery solid electrolyte with a continuous lithium ion transport path is constructed through a freeze casting technology, the dielectric constant of the solid electrolyte is effectively improved by adding the dielectric inorganic filler lithium niobate, lithium salt dissociation is promoted, preparation of the modified electrolyte can be simply completed on a large scale, industrial expansion is facilitated, coulombic efficiency is improved, and the lithium metal battery solid electrolyte is suitable for industrial production. According to the present invention, the lithium metal battery electrolyte meets the industrial requirement on the high lithium utilization rate, the lithium negative electrode can be well protected, the cycle life of the lithium electrode can be improved, the battery electrolyte and the lithium electrode show the good interface compatibility and the good cycle stability, and the new feasible way is provided for the application of the lithium metal battery.

The invention discloses a fluororubber cloth clamping material for a V-group sealing element of a large oil cylinder and a preparation method of the fluororubber cloth clamping material. The fluororubber cloth clamping material comprises polyester cloth serving as a framework material and fluororubber compounded on the surface of the polyester cloth through a treating agent, the treating agent is a dopamine-grafted silane coupling agent KH-550, and the curing agent is a curing agent; and the fluororubber is vinylidene fluoride-hexafluoropropylene co-fluororubber. According to the invention, the problem of bonding of fluororubber and polyester cloth is solved, and the obtained fluororubber cloth clamping material has excellent water resistance and salt spray resistance in a marine environment, and can meet the high reliability requirement of a large-scale oil cylinder V-group sealing element within the service life of 20 years.

The invention discloses a two-phase immersed fluorine-containing cooling liquid, the fluorine-containing cooling liquid comprises a hexafluoropropylene dipolymer and hydrofluoroolefin, the molecular formula of the hexafluoropropylene dipolymer is C6F12, and the molecular formula of the hydrofluoroolefin is C6H2F10, the fluorine-containing cooling liquid not only has good electrical insulation performance, but also has the advantage of high heat transfer coefficient, and the fluorine-containing cooling liquid is suitable for being used as a cooling liquid for a motor vehicle. The fluorine-containing cooling liquid provided by the invention is continuously subjected to the phase change process from the liquid state to the gas state and then from the gas state to the liquid state in the circulating heat dissipation process, the evaporation latent heat of the cooling liquid is fully utilized, and the heat dissipation requirement of a high-power heating element can be met.

To provide a heat transfer fluid having a relatively high boiling point.SOLUTION: The present disclosure provides a composition for a heat transfer fluid, which contains hexafluoropropene trimers having specific three structures, (I), (II), and (III), and in which a compound having the structure (I) is contained in an amount of 10 mass% or more and less than 85 mass% relative to the total amount of the hexafluoropropene trimers having the three structures.SELECTED DRAWING: None

The invention discloses a PEM proton exchange membrane for water electrolysis and a preparation method thereof, and relates to the technical field of water electrolysis. The proton exchange membrane is composed of five layers of structures including a modified sulfonated composite resin layer, an enhancement layer, a water retention layer, a catalyst layer and an anti-permeation layer, the preparation method comprises the following steps: the modified sulfonated composite resin layer is prepared by dispersing perfluorinated sulfonic acid resin and sulfonated lignin in a solvent, coating and drying; the reinforcing layer is prepared by blending a PTFE (Polytetrafluoroethylene) emulsion, a carbon nanotube and a tetrafluoroethylene-hexafluoropropylene copolymer, and then carrying out casting sintering, plasma treatment and hot press molding; the water retention layer is prepared by adopting an electrostatic spinning technology; the catalyst layer is formed by spraying a precursor solution step by step and drying; the anti-permeation layer is prepared through photoetching-etching array construction, resin coating and fluorosilane modification. The prepared proton exchange membrane has excellent mechanical strength, proton conductivity and stability, and is suitable for the field of PEM water electrolysis.

The invention discloses a fluorinated COF enhanced PVDF-HFP composite gel polymer electrolyte. The fluorinated COF enhanced PVDF-HFP composite gel polymer electrolyte is prepared from the following raw materials: polyvinylidene fluoride-co-hexafluoropropylene, a fluorinated covalent organic framework containing an ether oxygen bond and a carbon-carbon unsaturated double bond, bis (trifluoromethylsulfonyl) imide anion ionic liquid and fluorine-containing imide lithium salt, the fluorinated covalent organic framework containing the ether-oxygen bond and the carbon-carbon unsaturated double bond is prepared by carrying out condensation reaction on a perfluorophenylene-containing module and the ether-oxygen bond-containing aromatic module. According to the electrolyte, PVDF-HFP is used as a polymer matrix, bis (trifluoromethylsulfonyl) imidogen ionic liquid is used as a functional phase and a plasticizer, imide lithium salt is used as a lithium ion source, fluorinated COF containing ether oxygen bonds and olefinic bonds is introduced, and the electrolyte has high ionic conductivity, high lithium ion transference number, excellent mechanical property and interface stability; the method is especially suitable for a high-safety lithium metal battery system.

The invention discloses a low-temperature high-conductivity composite solid-state electrolyte membrane and a preparation method and application thereof, and relates to the technical field of solid-state lithium battery materials, the low-temperature high-conductivity composite solid-state electrolyte membrane comprises: a polymer matrix composed of poly (1, 3-dioxolame) and a polyvinylidene fluoride-hexafluoropropylene copolymer; the ion conduction network is composed of a metal organic framework filler with the surface modified with-SO3Li groups and sulfonic acid lithiated carbon nanotubes arranged in the axial direction of the polymer matrix; a first anti-freezing interface layer and a second anti-freezing interface layer are arranged on the surfaces of the two opposite sides of the polymer matrix, and the first anti-freezing interface layer and the second anti-freezing interface layer are butanedinitrile-glutaronitrile eutectic plastic crystal layers composed of butanedinitrile, glutaronitrile, lithium salt and a nano reinforcing agent respectively. The solid electrolyte is suitable for polar scientific investigation equipment, spacecrafts and other low-temperature environments, and solves the industrial problems of sharp increase of low-temperature grain boundary impedance and interface contact failure of the traditional solid electrolyte.

The invention discloses lithium ion diaphragm coating slurry and a preparation method and application thereof.The lithium ion battery diaphragm comprises a base membrane and a coating on the base membrane, the coating comprises a dispersing agent, potassium carboxymethyl cellulose and side-chain modified polyvinylidene fluoride, and the method for preparing the side-chain modified polyvinylidene fluoride comprises the steps that vinylidene fluoride, hexafluoropropylene, (S)-4-pentene-1, 2, 4-triazole-1, 2, 4-triazole-1, 2, 4-triazole-1, 2, 4-triazole-1, 2, 4-triazole-1, 2, 4-triazole-1, 3-triazole-1, 3-triazole-1, 2-triazole-1, the preparation method comprises the following steps: uniformly mixing 1, 2-diol, (S)-3-(trifluoromethyl) adipyl dichloride, an initiator, an auxiliary agent and a solvent, and reacting for 9-12 hours in an inert gas atmosphere at 75-80 DEG C under a stirring condition to obtain a reaction solution; and carrying out spray drying on the reaction liquid to obtain the side chain modified polyvinylidene fluoride. The coating slurry provided by the invention can realize firm bonding between the diaphragm and a pole piece at room temperature, improves the stability and safety of a battery structure, and remarkably reduces the internal resistance of the battery diaphragm at the same time.

The application relates to the technical field of batteries, in particular to a composite solid electrolyte membrane and a preparation method and application thereof. The composite solid electrolyte membrane comprises the following layers which are sequentially stacked: a first membrane layer comprising a polymer, a solid electrolyte and a lithium salt; a second membrane layer comprising a polymer, a solid electrolyte and a lithium salt; and a third membrane layer which is an interface layer; wherein the solid electrolyte and the lithium salt content of the second membrane layer are higher than those of the first membrane layer, and the polymer is formed by polymerization of raw materials comprising triacetyl cellulose (TCA) and polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP). The composite solid electrolyte membrane has improved high-temperature resistance and good ion transmission performance.

The invention provides a green and efficient production method of hexafluoropropylene oxide, and belongs to the technical field of synthesis of organic fluorine compounds. The method comprises the following steps: carrying out a continuous oxidation reaction on hexafluoropropylene, oxygen and a perfluoro solvent in an immersed supergravity reactor to generate HFPO and byproducts carbonyl fluoride and trifluoroacetyl fluoride, removing the solvent from the reacted liquid, feeding the liquid into an acyl fluoride rectifying tower, separating low-boiling-point acyl fluoride from the tower top, enriching HFPO, unreacted HFP and a small amount of acyl fluoride from the tower bottom, and carrying out a continuous oxidation reaction on the HFPO and the byproducts carbonyl fluoride and trifluoroacetyl fluoride. Converting acyl fluoride into anhydrous trifluoroacetic acid from a high-boiling-point substance at the bottom of the tower through a hydrolysis tower, carrying out alkali washing on the synthesis gas to obtain an HFPO crude product, and further carrying out drying and extractive distillation to obtain an HFPO product; acyl fluoride rectified by an acyl fluoride rectifying tower is directly used for producing PAVE, and long-chain perfluoroacyl fluoride accumulated in a solvent of oxidation reaction is hydrolyzed to synthesize a non-PFOA emulsifier. The method has the advantages of high HFPO selectivity, short reaction time and high safety; the method realizes resource comprehensive utilization of byproducts, and is environment-friendly and economical.

The invention discloses an ultrathin battery diaphragm with high cohesiveness and safety as well as a preparation method and application of the ultrathin battery diaphragm. The battery diaphragm comprises a polyolefin base material and polyvinylidene fluoride coatings arranged on the two sides of the polyolefin base material, wherein each polyvinylidene fluoride coating comprises aluminum oxide particles, a first polyvinylidene fluoride copolymer and a second polyvinylidene fluoride copolymer; the particle size of the aluminum oxide particles is below 0.4 micron; both the first polyvinylidene fluoride copolymer and the second polyvinylidene fluoride copolymer contain vinylidene fluoride and hexafluoropropylene monomer units, and the molar percentage of the hexafluoropropylene monomer unit in the first polyvinylidene fluoride copolymer is lower than that of the hexafluoropropylene monomer unit in the second polyvinylidene fluoride copolymer. The battery diaphragm has ultra-thin thickness, has high binding power with a metal electrode plate, and is high in battery safety when being used for a battery.

The invention discloses a gel electrolyte, a lithium ion battery and a preparation method of the lithium ion battery, and belongs to the technical field of lithium batteries. The invention discloses a gel electrolyte, which comprises a polymer main matrix, an initiator, a lithium salt, an organic solvent, a solid electrolyte and a coalescing agent, and the polymer main matrix comprises poly (vinylidene fluoride-hexafluoropropylene)-polyacrylonitrile-maleic anhydride-ethylene carbonate. The stability of the gel electrolyte is effectively improved.

The invention discloses a synthesis method of low-molecular-weight perfluoropolyether acyl fluoride, which comprises the following steps: hexafluoropropylene, oxygen, a catalyst and a fluorine-containing solvent are subjected to an oxidative polymerization reaction, the reaction liquid is subjected to light component removal and solvent removal to obtain the low-molecular-weight perfluoropolyether acyl fluoride, and the temperature of the oxidative polymerization reaction is 130-300 DEG C. According to the invention, hexafluoropropylene is used as a raw material and is oxidized by oxygen in a fluorine-containing solvent, so that low-component perfluoropolyether acyl fluoride is synthesized in one step. In the presence of a catalyst, formyl fluoride, trifluoroacetyl fluoride and hexafluoropropylene oxide continue to be added into an oligomer, and the oligomer is mainly perfluoropolyether acyl fluoride with a straight-chain structure. And when the reaction temperature is within the range, the smooth proceeding of the oxidative polymerization reaction can be ensured, the sharp rise of the reaction pressure caused by the overhigh reaction temperature can be avoided, and the model selection of reaction equipment is convenient.

The invention belongs to the technical field of fluorine chemical industry, and particularly relates to a continuous production process of heptafluoroisobutyryl fluoride. The process is carried out in a tubular reactor, the tubular reactor is divided into a first preheating section, a second reaction section and a third reaction section, a fluorinated molecular sieve catalyst is filled in the second reaction section and the third reaction section, each reaction section is respectively heated to a corresponding preset temperature, carbonyl fluoride and hexafluoropropylene which are mixed and preheated are introduced into the tubular reactor, and a fluorinated molecular sieve catalyst is introduced into the tubular reactor. Enabling the gas to sequentially flow through each section of the tubular reactor, contacting and reacting with the fluorinated molecular sieve catalyst in the second reaction section and the third reaction section, and condensing the gas discharged from the outlet end of the tubular reactor to obtain a heptafluoroisobutyryl fluoride product. According to the process, carbonyl fluoride and hexafluoropropylene are used as gas-phase reaction raw materials, and heptafluoroisobutyryl fluoride is synthesized through a one-step continuous flow rapid reaction. The reaction route is short, the reaction conversion rate and selectivity are high, and industrial large-scale production is easy to realize.

The invention belongs to the technical field of radiation refrigeration, and discloses a modified PVDF and HFP composite porous membrane and a preparation method thereof. The modified PVDF and HFP composite porous membrane comprises a substrate layer, a porous bottom layer and a compact top layer. Wherein the porous bottom layer is prepared from acetone, deionized water, a PVDF-HFP copolymer, a mixed dispersion liquid and a modified nanosheet dispersion liquid; the compact top layer is prepared from acetone, deionized water, a PVDF-HFP (Polyvinylidene Fluoride-Hexafluoropropylene) copolymer, synergistic microspheres and a modified nanosheet dispersion liquid; the mixed dispersion liquid is prepared from acetone, silicon carbide, synergistic microspheres and polyvinylpyrrolidone. The radiation refrigeration capacity, hydrophobicity, dimensional stability and aging resistance of the modified PVDF and HFP composite porous membrane are effectively improved by introducing the modified nanosheet dispersion liquid and the synergistic microspheres. Therefore, the method has a wider application prospect.

Disclosed in the present invention is a method for producing 2,3,3,3-tetrafluoropropene from 1,1,2,3,3,3-hexafluoropropene, comprising: (a) introducing 1,1,2,3,3,3-hexafluoropropene and hydrogen into a first reactor for a catalytic reaction to obtain a first reaction product; (b) separating the first reaction product to obtain 1,1,1,2,3,3-hexafluoropropane; (c) introducing 1,1,1,2,3,3-hexafluoropropane into a second reactor for a catalytic reaction to obtain a second reaction product; (d) separating the second reaction product to obtain 1,2,3,3,3-pentafluoropropene; (e) introducing 1,2,3,3,3-pentafluoropropene and hydrogen into a third reactor for a catalytic reaction to obtain a third reaction product; (f) separating the third reaction product to obtain 1,1,1,2,3-pentafluoropropane; (g) introducing 1,1,1,2,3-pentafluoropropane into a fourth reactor for a catalytic reaction to obtain a fourth reaction product; and (h) separating the fourth reaction product to obtain a final product of 2,3,3,3-tetrafluoropropene. The present invention has the advantages of being simple in process, low in cost, high in efficiency, green, and environmentally friendly.

The invention provides a core-shell structured gel polymer electrolyte and a preparation method and application thereof.The core-shell structured gel polymer electrolyte comprises a core-shell structured nanofiber, the core-shell structured nanofiber comprises a core layer and a shell layer, the core layer comprises a polyvinylidene fluoride-hexafluoropropylene copolymer and inorganic nanoparticles, and the shell layer comprises a shell layer and a polyvinylidene fluoride-hexafluoropropylene copolymer; the polyvinylidene fluoride-hexafluoropropylene copolymer and the inorganic nanoparticles are connected through a silane coupling agent; the shell layer comprises a polyacrylate polymer. The gel polymer electrolyte based on the core-shell structure solves the technical problem that the gel polymer electrolyte in the prior art is difficult to consider ionic conductivity, mechanical strength and interfacial compatibility between the electrolyte and an electrode material at the same time.

The invention discloses a roof component based on evaporation and radiation collaborative cooling and preparation and construction thereof. The roof component breaks through the limitation of a single cooling mode through a multi-layer structure coupling evaporative cooling and radiation cooling technology. The reflective film specifically comprises a base layer, an evaporation radiation synergistic cooling material layer and a reflective protection layer. The synergistic material layer is formed by modifying polyacrylamide hydrogel through lithium bromide moisture absorption salt, titanium dioxide nanoparticles are embedded to improve the short-wave reflectivity and long-wave emissivity, and the synergistic material layer has the functions of radiation cooling and moisture absorption evaporation; the reflective protective layer is made of polyvinylidene fluoride-hexafluoropropylene copolymer, so that radiation cooling power is supplemented and pollution is prevented on the premise of moisture permeability; the heat entering a room is reduced by combining an evaporation radiation synergistic cooling material and a reflection protection material; by means of the roof component based on evaporation and radiation collaborative cooling, the limitation of cooling power can be broken through, the cooling effect is enhanced, and the purpose of building energy saving is achieved.

The invention discloses a polyethylene diaphragm for a lithium battery and a preparation method of the polyethylene diaphragm, and belongs to the technical field of key materials of lithium ion batteries. 8 to 12% of a polyvinylidene fluoride-hexafluoropropylene copolymer; 8-12% of a boron nitride nanotube; 5-8% of lithium lanthanum zirconium oxide; 3-5% of temperature-sensitive polymer microspheres; 2-4% of an ionic liquid; wherein the boron nitride nanotubes are BNNTs (boron nitride nanotubes), and the BNNTs are modified by a silane coupling agent KH-550, so that amino groups are introduced into the surfaces of the BNNTs. The diaphragm has temperature response closed pore protection and a three-dimensional heat conduction network, and is relatively small in thermal shrinkage rate and high in ionic conductivity; through the synergistic effect of material components and optimization of process parameters, the heat stability, mechanical strength, ionic conductivity and safety protection performance are comprehensively improved while the light and thin characteristics of a traditional polyolefin diaphragm are kept, and a key material support is provided for a high-energy-density lithium battery.

The invention provides an MXene-based binder, a tungsten-based delay powder and a preparation method, and the preparation method of the MXene-based binder specifically comprises the following steps: mixing a vinyl chloride-vinyl acetate resin solution, a polyvinylidene fluoride-hexafluoropropylene solution and an MXene suspension to obtain a mixed solution; and adding a plasticizer into the mixed solution, stirring, drying, freezing and crushing to obtain the Mxene-based binder. The preparation method of the binder system is simple, large-scale production is facilitated, and the binder system is stable in combustion, high in combustion efficiency, good in mechanical property and low in gas yield when applied to the tungsten delay powder.

To provide a composition for heat transfer fluid as a novel mixture.SOLUTION: The present invention provides a composition for heat transfer fluid containing a hexafluoropropene trimer represented by C9F18, (i) CmF2m and / or CnF(2n-2) (in the formula, m is an integer from 4 to 12 other than 9. n is an integer from 4 to 12), (ii) water (the content of water is 0.0001-0.1 pt.mass relative to 100 pts.mass of the total amount of the hexafluoropropene trimer represented by C9F18), and / or (iii) fluoride ions (the content of the fluoride ions is 0.0000001 to 5 pts.mass relative to 100 pts.mass of the total amount of the hexafluoropropene trimer represented by C9F18).SELECTED DRAWING: None

The invention discloses a perfluoropolyether-based polymer solid electrolyte film regulated and controlled by a mixed solvent as well as a preparation method and application of the perfluoropolyether-based polymer solid electrolyte film, and belongs to the field of organic polymer solid electrolyte preparation. Reacting under the action of an initiator and an RAFT (reversible addition-fragmentation chain transfer) reagent to obtain a perfluoropolyether-based copolymer; the method comprises the following steps: adding a perfluoropolyether-based copolymer into a polyvinylidene fluoride-hexafluoropropylene copolymer solution in which lithium salt is dissolved, the mass of the polyvinylidene fluoride-hexafluoropropylene copolymer accounts for 10%-30% of the mass of the polyvinylidene fluoride-hexafluoropropylene copolymer, the mass of the N, N '-dimethylformamide, the mass of the trifluorotoluene and the mass of the perfluoropolyether-based copolymer account for 10%-30% of the mass of the polyvinylidene fluoride-hexafluoropropylene copolymer, and the perfluoropolyether-based polymer solid-state electrolyte film is obtained by uniformly mixing and then preparing a film. And the comprehensive performance of the composite solid electrolyte serving as the film is improved.

The invention relates to a polyurethane-based composite solid polymer electrolyte film and a preparation method and application thereof, and belongs to the field of organic polymer solid electrolyte preparation. Polyethylene glycol-polypropylene glycol triblock copolymer and hydroxyl-terminated polybutadiene are used as soft segments, isophorone diisocyanate is used as a hard segment, and under the action of a catalyst, the polyurethane-based composite solid polymer electrolyte film is prepared. A chain extender containing disulfide bonds is utilized, and a polyurethane elastomer is prepared through gradual addition polymerization reaction; a polyurethane elastomer and a mixed solution of a lithium salt and a polyvinylidene fluoride-hexafluoropropylene copolymer are uniformly mixed, the polyurethane elastomer accounts for 10%-30% of the mass of the polyvinylidene fluoride-hexafluoropropylene copolymer, a precursor solution is obtained, the precursor solution is prepared into a film, and the polyurethane-based composite solid polymer electrolyte film is obtained. The polymer solid electrolyte membrane with excellent mechanical property and excellent lithium ion conductivity is constructed, and the development requirement of a high-performance lithium metal battery is met.

The invention belongs to the technical field of material physics, and particularly relates to a triboelectroluminescence composite material, a preparation method thereof and a triboelectroluminescence tactile device. The triboelectric electroluminescent composite material is formed by compounding a polymer matrix, a triboelectric reinforcing filler and fluorescent powder, the frictional electricity reinforcing filler is polytetrafluoroethylene; the fluorescent powder is ZnS: Cu; and the polymer matrix is polyvinylidene fluoride-hexafluoropropylene. The triboelectroluminescent composite material is used as a luminescent layer and a triboelectrification layer, and the triboelectroluminescent tactile device constructed by the triboelectroluminescent composite material and a friction material shows an ultra-low pressure detection limit of 0.42 Pa; and along with the increase of the pressure intensity, the output optical signal and electric signal are stronger. The strongest luminous intensity of the triboluminescence tactile device is 1.25 times of the indoor light intensity, and the triboluminescence tactile device can obviously emit light in outdoor sunlight.

The invention discloses a coating diaphragm and a preparation method thereof, the coating diaphragm comprises a base film, a first coating and a second coating, the first coating and the second coating are respectively located on two sides of the base film; the first coating comprises sodium carboxymethyl cellulose, a metal organic framework, a modified solid electrolyte and a first pressure-sensitive adhesive, and the modified solid electrolyte is obtained by modifying a solid electrolyte with silicon resin; and the second coating comprises sodium carboxymethyl cellulose, a polyvinylidene fluoride-hexafluoropropylene copolymer, an emulsion type binder and a second pressure-sensitive binder. The solid electrolyte has a rigid framework to provide a rapid conduction channel, and the metal organic framework has a high specific surface area and can cooperate with the solid electrolyte to construct a three-dimensional network, so that the stable performance of the coating diaphragm is guaranteed.

The invention discloses an application of a PVDF (Polyvinylidene Fluoride) terpolymer as a negative electrode binder of a semi-solid battery, and the PVDF terpolymer is prepared from a unit derived from vinylidene fluoride accounting for 93.5-98.9% of the molar percentage of the terpolymer, a unit derived from hexafluoropropylene accounting for 1.0-5.0% of the molar percentage of the terpolymer, and a unit derived from hexafluoropropylene accounting for 1.0-5.0% of the molar percentage of the terpolymer. The unit derived from acrylic acid accounts for 0.1%-1.5% of the mole percent of the terpolymer; in the first repeating unit, the molecular weight of the PVDF terpolymer is greater than 1.5 million, in the second repeating unit, the randomly distributed second monomer unit part is 22%-40%, and the molecular weight of vinylidene fluoride VDF, hexafluoropropylene HFP, acrylic acid AA and the PVDF terpolymer is greater than 1.5 million, so that the electrolyte and the PVDF terpolymer form a strong gel-state substance through the synergistic effect, the random flow of the electrolyte among solid particles is limited, and the electrolyte can be used for the lithium ion battery. The long-term uniformity and stability of the electrolyte in the electrode are ensured, the cycle retention rate of the prepared semi-solid battery is high, and the cycle life of the semi-solid battery is prolonged.