810 results about "Hexafluoropropylene" patented technology

The invention relates to a wide-range gradient microstructure ion capacitive pressure sensor and a preparation method thereof. The sensor comprises an outer wrapping layer and a sensor main body part, the sensor main body part is packaged in the outer wrapping layer; the sensor main body part is of a multi-layer combined structure and comprises a top polyimide film layer, a top copper electrode layer, a dielectric layer, a bottom copper electrode layer and a bottom polyimide film layer which are arranged in sequence; the dielectric layer is made of ionic gel, and the ionic gel is formed by mixing polyvinylidene fluoride-hexafluoropropylene and 1-ethyl-3-methylimidazoline bis (trifluoromethylsulfonyl) imide salt; the top polyimide film and the top copper electrode layer are tightly attached and fixed, the bottom polyimide film and the bottom copper electrode layer are tightly attached and fixed, and the dielectric layer is located between the top copper electrode and the bottom copper electrode. And one side, close to the top copper electrode, of the dielectric layer is provided with a uniformly-distributed gradient microstructure with height difference. According to the invention, the sensitivity of the sensor is kept at a high level in a wide range.

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 discloses a multifunctional composite hydrophobic membrane and a preparation method thereof, in the hydrophobic membrane, nano silicon dioxide, hydroxyl multi-walled carbon nanotubes and perfluorooctyl ethyl acrylate are polymerized to obtain a modified composite material, the modified composite material is added into a polyvinylidene fluoride-hexafluoropropylene copolymer, fibers are formed through an electrostatic spinning method, the fibers are deposited on a polyester net base lining, and the multifunctional composite hydrophobic membrane is prepared. Nano-silica and hydroxyl multi-walled carbon nanotubes are modified, agglomeration is effectively avoided, the hydrophobic membrane has good mechanical strength and toughness, and microcosmic multi-dimensional roughness of the surface of the membrane can be achieved by introducing an inorganic-organic nano hybrid material. Fluorine atoms in a perfluorooctyl ethyl acrylate structure have relatively low surface energy, so that the surface energy of the film can be remarkably reduced, the surface of the film has low surface energy and a rough structure, and the film is high in hydrophobicity and good in chemical stability.

The invention discloses a continuous synthesis and purification method of hexafluoropropylene oxide, which comprises the following steps: introducing hexafluoropropylene, oxygen and a fluorine-containing solvent into a supergravity reactor to carry out oxidation reaction at the reaction temperature of 100-200 DEG C under the reaction pressure of 1.0-2.5 Mpa for 10-120 seconds, and after the reaction is finished, overflowing and leading out reaction liquid to obtain the hexafluoropropylene oxide. And purifying to obtain the hexafluoropropylene oxide. According to the method, the problems of mass transfer and heat transfer can be effectively solved by using the supergravity reactor, the reaction selectivity is remarkably improved, meanwhile, the productivity is effectively improved, and the supergravity reactor is combined with extractive distillation treatment, so that the conversion rate of the hexafluoropropylene reaches 79% or above, the selectivity of the hexafluoropropylene oxide is 85% or above, and the purity of the hexafluoropropylene oxide after extractive distillation reaches 99%. The invention further discloses a device used in the continuous synthesis and purification method, and cyclic utilization of hexafluoropropylene and the fluorine-containing solvent can be achieved.

There is provided a fluorine-containing copolymer comprising tetrafluoroethylene unit, hexafluoropropylene unit and perfluoro (propyl vinyl ether) unit, wherein the copolymer has a content of hexafluoropropylene unit of 9.4 to 10.1% by mass with respect to the whole of the monomer units, a content of perfluoro (propyl vinyl ether) unit of 0.8 to 1.78 by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 4.5 to 8.5 g / 10 min, and a total number of a carbonyl group-containing terminal group, —CF═CF2 and —CH2OH per 106 main-chain carbon atoms of 90 or less.

The invention discloses a polyion liquid / polyvinylidene fluoride-hexafluoropropylene-based solid electrolyte with a microscopic liquid phase and a preparation method and application thereof, and the preparation method comprises the following steps: adding a lithium salt into N-methyl-2-pyrrolidone, and stirring until the lithium salt is completely dissolved; then adding imidazolyl polyion liquid to prepare a solution A; adding polyvinylidene fluoride-hexafluoropropylene into N-methyl-2-pyrrolidone to prepare a solution, adding the solution into the solution A, continuously stirring until the solution is fully dissolved to obtain a precursor solution of the solid electrolyte, casting the precursor solution onto a polytetrafluoroethylene mold, and carrying out vacuum drying to obtain the solid electrolyte. And the polyvinylidene fluoride-hexafluoropropylene polymer-based solid electrolyte added with the imidazolyl polyion liquid is prepared by adding the imidazolyl polyion liquid into the polyvinylidene fluoride-hexafluoropropylene polymer-based solid electrolyte. The polymer-based solid electrolyte with a microscopic liquid phase is obtained through an electrolyte preparation process which is mild in condition, simple to operate and easy for large-scale production, and the solid electrolyte has good conductivity and mechanical properties.

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.

There is provided a fluorine-containing copolymer comprising tetrafluoroethylene unit, hexafluoropropylene unit and perfluoro (propyl vinyl ether) unit, wherein the copolymer has a content of hexafluoropropylene unit of 8.5 to 9.5% by mass with respect to the whole of the monomer units, a content of perfluoro (propyl vinyl ether) unit of 1.2 to 1.88 by mass with respect to the whole of the monomer units, a melt flow rate at 372°° C. of 9.0 to 15.0 g / 10 min, and a total number of a carbonyl group-containing terminal group, —CF═CF2 and —CH2OH per 106 main-chain carbon atoms of 100 or less.

There is provided a fluorine-containing copolymer comprising tetrafluoroethylene unit, hexafluoropropylene unit and perfluoro (propyl vinyl ether) unit, wherein the copolymer has a content of hexafluoropropylene unit of 9.4 to 11.4% by mass with respect to the whole of the monomer units, a content of perfluoro (propyl vinyl ether) unit of 1.2 to 2.38 by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 17.0 to 24.0 g / 10 min, and a total number of a carbonyl group-containing terminal group, —CF═CF2 and —CH2OH per 106 main-chain carbon atoms of 120 or less.

The invention discloses a titanium lithium aluminum phosphate solid electrolyte polymer interface modification method and a preparation method thereof. The method comprises the following steps: firstly, selecting LITFSI (lithium ion conductor), PVDF-HFP (polyvinylidene fluoride-hexafluoropropylene) and DMSO (dimethyl sulfoxide) liquid, and mixing to form PVDF-HFP-based polymer mixed liquid; then, the PAN film doped with titanium lithium aluminum phosphate powder is uniformly coated with the mixed solution through a press coating method, and the PVDF-HFPPAN film is obtained through drying treatment. And cutting the membrane, placing the cut membrane on two sides of a ceramic chip solid electrolyte, assembling an all-solid-state battery, activating at 40-80 DEG C until the polymer is attached to a metal lithium negative electrode and the surface of the solid electrolyte in a gel state, and cooling to finally obtain the solid electrolyte with a PVDF-HFPPAN coated LATP coated PVDF-HFPPAN sandwich structure. The modified solid-state electrolyte membrane can effectively inhibit the interface reaction of LATP on the lithium negative electrode side and enhance the wettability of the positive and negative electrode interface, thereby meeting the cycle performance requirement of the solid-state battery under the normal temperature condition.

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 belongs to the field of fluorine-containing fine organic chemical synthesis, and particularly relates to a method for continuously and cleanly producing perfluoroolefin epoxide by using hydrogen peroxide. The invention relates to a method for continuously and cleanly producing perfluoroolefin epoxide by using hydrogen peroxide, which comprises the following steps of: reacting perfluoro-2-methyl-2-pentene serving as a raw material in the presence of a polar solvent and hydrogen peroxide serving as an oxidant under the action of a catalyst to obtain perfluoro-2-methyl-2, 3-epoxypentane. The method has the beneficial effects that the micro-reactor is used, and the oxidizing agent, the catalyst, the cocatalyst and the polar solvent are continuously introduced into the pipeline of the micro-reactor, so that the synthesis from the hexafluoropropylene dimer to the epoxy compound is completed in a short time.

There is provided a fluorine-containing copolymer comprising tetrafluoroethylene unit, hexafluoropropylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of hexafluoropropylene unit of 9.4 to 10.7% by mass with respect to the whole of the monomer units, a content of perfluoro(propyl vinyl ether) unit of 0.5 to 1.7% by mass with respect to the whole of the monomer units, and a melt flow rate at 372° C. of 13.0 to 18.0 g / 10 min.

The invention provides a lithium supplement composite layer and a preparation method thereof, a lithium supplement method, a pre-lithiated negative pole piece, a secondary battery and an electronic device, the lithium supplement composite layer comprises an interface layer and a lithium supplement layer which are laminated, the interface layer comprises interface particles and a binder, the interface particles comprise a lithium intercalation material and / or a conductive agent, and the binder comprises a lithium intercalation material and / or a conductive agent. The lithium intercalation material is selected from at least one of artificial graphite, natural graphite, hard carbon, a silicon-carbon material, a silicon-oxygen material, lithium titanate, tin and a tin-copper alloy, and the conductive agent is selected from at least one of conductive carbon black, carbon fiber, graphene and a carbon nanotube; the binder is selected from at least one of polytetrafluoroethylene, an ethylene-tetrafluoroethylene copolymer, a tetrafluoroethylene-hexafluoropropylene copolymer, polyvinylidene fluoride and polyoxyethylene; the lithium supplementing layer comprises lithium metal and / or lithium alloy. The lithium supplement composite layer meets the above characteristics, lithium supplement is carried out on the negative pole piece, the first coulombic efficiency of the secondary battery can be improved, the cycle capacity attenuation is reduced, and the energy density of the secondary battery is improved.

There is provided a fluorine-containing copolymer comprising tetrafluoroethylene unit, hexafluoropropylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of hexafluoropropylene unit of 11.5 to 12.5% by mass with respect to the whole of the monomer units, a content of perfluoro(propyl vinyl ether) unit of 0.3 to 0.8% by mass with respect to the whole of the monomer units, and a melt flow rate at 372° C. of 0.9 to 5.8 g / 10 min.

The invention discloses a lithium ion battery compound fire extinguishing agent and a preparation method and application thereof, and belongs to the technical field of lithium ion battery fire extinguishing agents. The fire extinguishing agent comprises the following raw materials in parts by weight: 10-50 parts of perfluorohexanone, 20-80 parts of hexafluoropropylene tripolymer and 1-3 parts of preservative. The compound fire extinguishing agent has the beneficial effects of efficient fire extinguishing capacity, excellent cooling efficiency, good corrosion resistance, stability, wide applicability and the like, in the fire extinguishing process, the fluorocarbon organic solvent can rapidly evaporate and absorb a large amount of heat, the temperature of a fire source is remarkably reduced, and therefore fire spreading is further inhibited. And the cooling efficiency can be accurately controlled by regulating and controlling the ratio of different solvents, so that the fire extinguishing requirements of different occasions are met, and powerful support is provided for development and application of the fire extinguishing technology.

There is provided a fluorine-containing copolymer comprising tetrafluoroethylene unit, hexafluoropropylene unit, and a fluoro (alkyl vinyl ether) unit, wherein the copolymer has a content of hexafluoropropylene unit of 11.2 to 13.2% by mass with respect to the whole of the monomer units, a content of the fluoro (alkyl vinyl ether) unit of 0 to 0.4% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 10.0 to 17.0 g / 10 min, and a total number of —CF2H, a carbonyl group-containing terminal group, —CF═CF2 and —CH2OH per 106 main-chain carbon atoms of 90 or less.

The invention discloses a gradient membrane based on continuous distribution of PVDF-HFP-silicon dioxide electronic injection microspheres and a construction method of the gradient membrane, and belongs to the field of gradient membranes, an improved electrostatic spinning and electrostatic spraying technology is utilized, a PVDF-HFP fiber membrane is prepared through the electrostatic spinning technology, PVDF-HFP / SiO2 composite microspheres are electrostatically sprayed, and a collector receiving device is combined, so that the gradient membrane is obtained. The traction speed change of the substrate film is controlled on the blade electrode, and a wettability gradient film with the continuously-changed surface appearance is constructed; on the surface of the prepared fiber membrane, the distribution form of the polyvinylidene fluoride-hexafluoropropylene / silicon dioxide composite microspheres on the surface of the membrane is in gradient change, a microstructure with continuous change is constructed, the contact angle of the fiber membrane is increased from 128 degrees to 153 degrees along with the change of the surface position, and a gradient surface gradually changing from hydrophobicity to super-hydrophobicity is obtained. And the preparation method has an excellent application prospect in the field of gradient films, bubble transmission and bubble micro-reaction.

There is provided a fluorine-containing copolymer comprising tetrafluoroethylene unit, hexafluoropropylene unit and perfluoro (propyl vinyl ether) unit, wherein the copolymer has a content of hexafluoropropylene unit of 8.0 to 9.4% by mass with respect to the whole of the monomer units, a content of perfluoro (propyl vinyl ether) unit of 0.6 to 1.5% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 6.8 to 9.9 g / 10 min, and a total number of a carbonyl group-containing terminal group, —CF═CF2 and —CH2OH per 106 main-chain carbon atoms of 90 or less.

The invention belongs to the technical field of lithium battery materials, and particularly relates to a preparation method of a polyvinylidene fluoride-hexafluoropropylene-based solid-state lithium battery, and the preparation method comprises the steps of preparing a composite solid electrolyte membrane and assembling the battery. Polyvinylidene fluoride hexafluoropropylene, lithium salt and nitrogen-methyl pyrrolidone are used as raw materials, and the plasticizer and the dendritic mesoporous nano silicon dioxide are added to prepare the composite solid electrolyte membrane, so that more conductive channels are provided for migration of lithium ions, and the electric capacity of the electrolyte is improved; according to the preparation method, the interface compatibility between the PVDF-HFP and the dendritic mesoporous nano silicon dioxide is improved, the electrochemical performance is improved, the crystallinity of the PVDF-HFP is reduced, and short circuit and explosion caused by the fact that dendritic crystals pierce the diaphragm are avoided; the invention solves the potential safety hazards caused by the traditional liquid electrolyte, such as leakage, combustion, explosion and the like, and has the advantages of simple preparation method and low cost, and is suitable for industrial large-scale production.

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 discloses a step-by-step polymerization preparation method of fluorinated ethylene propylene, and relates to the technical field of fluorine-containing polymers. According to the method adopted by the invention, ternary polymerization and ternary polymerization are divided into two steps, the first step is copolymerization of tetrafluoroethylene (TFE) and a perfluorovinyl ether monomer, the reaction can be carried out under lower pressure, the concentration of the TFE monomer is lower at the moment, and the polymerization reaction can be carried out according to a preset proportion only by a small amount of the perfluorovinyl ether monomer; the polymer emulsion with very small particle size is obtained. And 2, adding a certain amount of hexafluoropropylene (HFP) into the polymer emulsion, and continuously carrying out polymerization reaction to obtain the final fluorinated ethylene-propylene emulsion. A step-by-step polymerization process is adopted, so that the loss of a perfluorovinyl ether monomer in a fluorinated ethylene propylene ternary polymerization process is reduced, and the production cost is effectively reduced; the step-by-step polymerization can shorten the time of the second-step polymerization reaction and improve the production efficiency.

There is provided a fluorine-containing copolymer comprising tetrafluoroethylene unit, hexafluoropropylene unit and perfluoro (propyl vinyl ether) unit, wherein the copolymer has a content of hexafluoropropylene unit of 11.4 to 12.2% by mass with respect to the whole of the monomer units, a content of perfluoro (propyl vinyl ether) unit of 0.9 to 1.78 by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 4.0 to 13.0 g / 10 min, and a total number of a carbonyl group-containing terminal group, —CF═CF2 and —CH2OH per 106 main-chain carbon atoms of 90 or less.

There is provided a fluorine-containing copolymer comprising tetrafluoroethylene unit, hexafluoropropylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of hexafluoropropylene unit of 10.4 to 11.4% by mass with respect to the whole of the monomer units, a content of perfluoro(propyl vinyl ether) unit of 0.8 to 1.28 by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 7.1 to 9.4 g / 10 min, and a total number of a carbonyl group-containing terminal group, —CF═CF2 and —CH2OH per 106 main-chain carbon atoms of 90 or less.

There is provided a fluorine-containing copolymer comprising tetrafluoroethylene unit, hexafluoropropylene unit and perfluoro (propyl vinyl ether) unit, wherein the copolymer has a content of hexafluoropropylene unit of 8.0 to 9.4% by mass with respect to the whole of the monomer units, a content of perfluoro (propyl vinyl ether) unit of 0.6 to 1.58 by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 2.9 to 5.3 g / 10 min, and a total number of a carbonyl group-containing terminal group, —CF—CF2 and —CH2OH per 106 main-chain carbon atoms of 70 or less.

Dielectric thin film for a solid-state or semi-solid-state lithium battery, wherein the lithium battery comprises a negative electrode and a positive electrode; the dielectric thin film is connected between the negative electrode and the positive electrode; the negative electrode comprises a negative electrode slurry, which is used as a binder, and a plurality of negative electrode particles dispersed in the negative electrode slurry; the positive electrode comprises a positive electrode slurry, which is used as a binder, and a plurality of positive electrode particles dispersed in the positive electrode slurry; the dielectric thin film comprises: a first, a second and a third film layer; wherein the first film layer is connected to the positive electrode and the third film layer to the negative electrode; wherein the second film layer is connected between the first film layer and the third film layer; the first film layer comprises the following: a first polymer material which is used as the base material of the first film layer; wherein the first polymer material is a mixture of PVDF-HFP (polyvinylidene fluoride hexafluoropropylene copolymer), ADN (adiponitrile), GLN (glutaronitrile) and SN (succinonitrile); wherein each of the ADN, GLN and SN is used as a plasticizer in the first polymer material and is dispersed in the PVDF-HFP to disperse a structure of the first polymer material itself; a first lithium salt dispersed in the first polymer material; wherein the first lithium salt is a mixture of LiBOB (LiB(C2O4)2, lithium bis(oxalate)borate), LiTFSI (LiN(CF3SO2)2, lithium bis(trifluoromethanesulfonyl)imide) and LiFSI (F2LiNO4S2, lithium bis(fluorosulfonyl)imide); where ADN, GLN and SN in the first polymer material serve to reduce crystal precipitation of the first polymer material and to support dissociation of the first lithium salt in the first film layer, which increases lithium ion conductivity and malleability of the first film layer; the second film layer comprises the following: a second polymer material used as the base material of the second film layer; wherein the second polymer material is a mixture of PVDF-HFP, PAN (polyacrylonitrile) and SN; wherein PAN and SN are each used as plasticizers in the second polymer material and are dispersed in the PVDF-HFP; a second lithium salt dispersed in the second polymer material; wherein the second lithium salt is a mixture of LiFSI and LiTFSI; wherein PAN and SN in the second polymer material serve to reduce crystal precipitation of the second polymer material and to promote dissociation of the second lithium salt in order to increase lithium ion conductivity of the second film layer; a second inorganic ceramic structure consisting of a plurality of first LLZO particles dispersed in the second polymer material; an outer surface of each of the first LLZO particles is coated with a first dopamine layer (DA, 3,4-dihydroxyphenethylamine); each of the first LLZO particles consists of LLZO (lithium lanthanum zirconium oxide, Li7La3Zr2O) 12 ) or from LLZO doped with at least one metal; and the third film layer comprises the following: a third polymer material, which is used as the base material of the third film layer; the third polymer material is a mixture of PEO (poly(ethylene oxide), polyethylene oxide) and PAN; the PAN in the third polymer material is used as a plasticizer and is dispersed in the PEO; a third lithium salt formed from LiTFSI and dispersed in the third polymer material; a third inorganic ceramic structure formed from a plurality of second LLZO particles dispersed in the third polymer material; an outer surface of each of the second LLZO particles is coated with a second dopamine layer; each of the second LLZO particles is formed from LLZO or doped with at least one metal; and the third inorganic ceramic structure serves to increase the lithium ion conductivity of the negative electrode.

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.

There is provided a fluorine-containing copolymer comprising tetrafluoroethylene unit, hexafluoropropylene unit and perfluoro (propyl vinyl ether) unit, wherein the copolymer has a content of hexafluoropropylene unit of 9.5 to 10.68 by mass with respect to the whole of the monomer units, a content of perfluoro (propyl vinyl ether) unit of 0.5 to 1.5% by mass with respect to the whole of the monomer units, and a melt flow rate at 372° C. of 0.8 to 4.4 g / 10 min.

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.

There is provided a fluorine-containing copolymer comprising tetrafluoroethylene unit, hexafluoropropylene unit and perfluoro (propyl vinyl ether) unit, wherein the copolymer has a content of hexafluoropropylene unit of 10.3 to 11.6% by mass with respect to the whole of the monomer units, a content of perfluoro (propyl vinyl ether) unit of 1.4 to 2.68 by mass with respect to the whole of the monomer units, a melt flow rate at 372°° C. of 24.1 to 39.9 g / 10 min, and a total number of a carbonyl group-containing terminal group, —CF═CF2 and —CH2OH per 106 main-chain carbon atoms of 120 or less.