174 results about "Poly(benzimidazole)" 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 discloses a screen cloth enhanced polybenzimidazole porous membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: fully mixing polybenzimidazole, a polar solvent and a template to obtain a mixed solution, coating a base material with the mixed solution, placing a polymer mesh on the previous base material, and carrying out in-situ compounding, polar solvent removal and film formation to obtain a compact mesh reinforced polybenzimidazole film; and then carrying out in-situ etching treatment to prepare the screen cloth enhanced polybenzimidazole porous membrane. The size and connectivity of ion channels in the membrane can be regulated and controlled by regulating and controlling the type and content of templates in the membrane casting process, and the polybenzimidazole porous layer can be ultrathin by combining the effect of enhancing the mechanical property of the polymer mesh cloth, so that the mass transfer resistance of the polybenzimidazole porous separation layer is remarkably reduced, and the performance of the membrane is improved. The mesh-reinforced polybenzimidazole porous membrane has good dimensional stability and pore uniformity, and has the characteristics of high ion selectivity, high ion conductivity and high stability.

The invention belongs to the technical field of waterproof and moisture permeable membrane materials, and particularly relates to a bio-based microporous membrane based on a template and a preparation method and application thereof, and the preparation method comprises the following steps: dispersing one of polybenzimidazole, aminated PI and carboxylated PBO and modified CNF into a DMF / water system; performing electrostatic spinning on the high-viscosity spinning solution; carrying out low-temperature vacuum drying treatment on the modified nanofiber self-supporting framework; coating and filling the bio-based polyurethane resin into the bio-based microporous membrane template, and carrying out negative pressure adsorption until the filling is uniform; and carrying out gradient drying on the bio-based wet membrane to obtain the bio-based microporous membrane. Compared with the prior art, the problems that in the prior art, the mechanical property or stability of bio-based polyurethane is insufficient, and a nanofiber reinforcing technology is difficult to combine with the bio-based polyurethane are solved. A nanofiber self-supporting framework with a stable structure is prepared through an electrostatic spinning technology, and then the nanofiber self-supporting framework is compounded with bio-based polyurethane to form a microporous membrane layer with waterproof and moisture permeable functions.

The invention relates to the technical field of special polymer functional membranes, and discloses a polybenzimidazole gas separation membrane as well as a preparation method and application thereof, the polybenzimidazole gas separation membrane has an interpenetrating network-shaped pore structure, and the polybenzimidazole gas separation membrane has a nanoscale pore structure. The pore size distribution of the nanoscale pore structure is 0.1-30 nm, and the average pore size of the nanoscale pore structure is 1-80 nm. The polybenzimidazole gas separation membrane has an interpenetrating network-shaped pore structure and a nanoscale pore structure, so that the polybenzimidazole gas separation membrane has relatively high gas selectivity and permeability coefficient and also has relatively good mechanical properties.

The invention belongs to the technical field of high polymer materials, and particularly relates to a composite proton exchange membrane and a preparation method thereof. According to the prepared composite proton exchange membrane, the perfluorosulfonic acid resin capable of being industrially applied is selected as a base membrane material, and the modified polybenzimidazole polymer resin is added, so that the problem of high ion permeation rate of a perfluorosulfonic acid proton exchange membrane in the prior art is solved; interpenetration and permeation of the electrolyte in the use process of the perfluorosulfonic acid proton exchange membrane can be reduced, cross contamination of positive and negative electrolyte is greatly reduced, and the service life of the electrolyte is prolonged. The PBI is functionalized, so that the proton transmission capacity of the PBI is improved, and the proton exchange membrane formed by blending the functionalized PBI and the perfluorinated sulfonic acid resin can keep excellent vanadium resistance, excellent proton transmission capacity and relatively high ion selectivity at the same time. The preparation process is simple, and the prepared proton exchange membrane can meet the performance and long-term stability use requirements of a flow battery.

The invention relates to the technical field of polyaryletherketone composite materials, in particular to a modified carbon fiber reinforced polyaryletherketone composite material and a preparation method thereof.The preparation method comprises the following steps that S1, polybenzimidazole is attached to the surface of phosphorus-containing group functionalized carbon fiber; s2, in a protective atmosphere, preheating polyaryletherketone in a mold pressing mold, then uniformly laying the phosphorus-containing group functionalized carbon fibers treated in the step S1 on a preheated polyaryletherketone material, and carrying out stepped mold pressing forming, so as to obtain the modified carbon fiber reinforced polyaryletherketone composite material. The interface shear strength of the carbon fiber reinforced polyaryletherketone composite material is greatly improved through the action of surface modification of the phosphoric acid on the carbon fiber and interface transition of the polybenzimidazole.

The invention relates to the technical field of all-vanadium redox flow batteries, in particular to a high-oxidation-resistance polybenzimidazole proton exchange membrane as well as a preparation method and application thereof. According to the proton exchange membrane, different polymeric monomers with high oxidation resistance are mixed in the reaction process to prepare a polybenzimidazole block copolymer, and after the membrane formed by the polybenzimidazole block copolymer is soaked in high-concentration acid liquor, rapid and selective conduction of protons is achieved. Aiming at the problems that in the application process of poly (2, 2 '-(p-oxybiphenyl)-5, 5'-benzimidazole) in an all-vanadium redox flow battery, a polymer skeleton is easily oxidized by VO < 2 + > ions, so that the battery capacity is attenuated, and the energy conversion efficiency is continuously reduced, the preparation method comprises the following steps: synthesizing a high-oxidation-resistance polybenzimidazole block copolymer main chain; the microphase separation structure of the polybenzimidazole block copolymer membrane can be effectively improved, a rapid ion channel is constructed in the polybenzimidazole block copolymer membrane, and meanwhile, the utilization rate of an acid solution is increased.

The invention relates to the field of fabric preparation, in particular to a cold-proof and oxygen-resistant fabric applied to extreme working conditions and a preparation method of the cold-proof and oxygen-resistant fabric. The fabric is formed by compounding a honeycomb base body outer layer, a middle buffer layer and a functional inner layer. The outer layer is hexagonal honeycomb grid base cloth formed by weaving basalt filaments and PTFE modified polyimide core-spun yarns, and composite colloid is injected for stepped curing; the middle layer is formed by sewing a silicon dioxide aerogel felt subjected to electrostatic spraying of paraffin microcapsules and a flame-retardant pre-oxidized fiber felt; and the inner layer is an oxygen adsorption layer formed by activating polyimide / flame-retardant viscose blended yarns and then grafting the activated polyimide / flame-retardant viscose blended yarns with a ZIF-8 material. All the layers are separated through polybenzimidazole membranes, and the composite fabric with excellent cold resistance, flame retardance, oxygen resistance and structural stability is finally obtained through gradient hot pressing, water-cooling shaping and surface flame-retardant coating treatment and is suitable for protective equipment in an extreme environment.

The invention discloses a submicron ultrathin self-supporting ion conduction membrane as well as a preparation method and application thereof. The polymer is obtained through reaction of organic polymer resin and a cross-linking agent, has a full-cross-linked structure, and does not have interface impedance between a separation layer and a supporting layer; the organic polymer resin is selected from a polybenzimidazole polymer; the cross-linking agent is selected from 4, 4 '-bis (chloromethyl) biphenyl and / or p-chloromethyl benzene. And a reaction-non-diffusion phase conversion method is adopted, and the part which is not crosslinked or has a relatively low crosslinking degree is dissolved after the reaction, so that the sub-micron ionic conduction membrane for the flow battery is prepared. The cross-linking reaction enables the accumulation of polymers to be tighter, the pore size of the membrane is reduced, the mutual mixing of active substances in the flow battery is slowed down, and the coulombic efficiency of the battery is improved; and meanwhile, the transmission path of ions in the membrane can be effectively shortened by reducing the membrane thickness, so that the voltage efficiency of the battery is improved.

The present invention relates to the technical field of polybenzimidazoles. Disclosed are a polybenzimidazole, a polymer film, a preparation method, and a use. The polybenzimidazole of the present invention comprises a structural unit A1 and a structural unit A2 and optionally comprises a structural unit B1 and a structural unit B2, wherein the structural unit A1 has a structure represented by formula (A1), the structural unit A2 has a structure represented by formula (A2), the structural unit B1 has a structure represented by formula (B1), and the structural unit B2 has a structure represented by formula (B2). The polybenzimidazole of the present invention has relatively high light transmittance and relatively low haze, and the film has relatively high elongation at break.

The invention relates to the technical field of polybenzimidazole, and discloses polybenzimidazole and a proton exchange membrane as well as a preparation method and application of the polybenzimidazole and the proton exchange membrane. The polybenzimidazole comprises a structural unit A and a structural unit B, the structural unit A has a structure as shown in a formula (1), and the structural unit B has a structure as shown in a formula (2); wherein X1 is fluorine-containing alkylene,-O-,-SO2-or-CO-, X2 is a connecting bond,-O-,-SO2-or-CO-, and X1 is different from X2; r1 and R2 are the same or different, and are independently selected from any one of arylene, cycloalkylene, alkenylene, heteroalkylene and fluorine-containing alkylene. The polybenzimidazole provided by the invention has good mechanical properties and obviously higher proton conduction performance.

The invention firstly provides a phosphoric acid stable type high-temperature proton exchange membrane with amphiphilic polybenzimidazole and azide type ionic liquid, the ionic liquid in the composite membrane accounts for 30% by mass, and the prepared OHPBI-PIL-Px membrane exchanges anions into H2PO4 <-> through acid-base doping reaction, so that ion pairs are formed, and the proton exchange membrane has the advantages of high-temperature proton exchange, high-temperature proton exchange, high-temperature proton exchange and the like. The composite membrane constructs a proton transfer channel in a system, promotes proton transfer and transfer, provides alkaline quaternary ammonium sites, has strong acid-base interaction with PA, and can effectively reduce PA leakage. The long-term performance of the high-temperature proton exchange membrane can be enhanced. The invention further provides a preparation method of the stable high-temperature proton exchange membrane with the amphiphilic polybenzimidazole and azide ionic liquid phosphoric acid. The OHPBI-PIL-Px membrane is formed by crosslinking through an in-situ free radical polymerization method. The formed high-temperature proton exchange membrane is excellent in electrochemical performance and controllable in cost, has a production prospect and can be applied to the field of high-temperature proton exchange membrane fuel cells.

The invention discloses an electrostatic spinning coated protective diaphragm, which comprises a polytetrafluoroethylene base membrane and a bactericidal electrostatic spinning layer, the bactericidal electrostatic spinning layer is composed of polybenzimidazole, polyacrylic acid and a metal salt, and is obtained by electrostatic spinning and cross-linking agent treatment, the molar ratio of polybenzimidazole to polyacrylic acid is 1: 1, and the molar ratio of polybenzimidazole to polyacrylic acid is 1: 1. The aperture is gradually increased from the side, attached to the polytetrafluoroethylene base membrane, of the sterilization electrostatic spinning layer to the other side of the sterilization electrostatic spinning layer. The invention further discloses a preparation method of the electrostatic spinning coating protective diaphragm, the polyion liquid and the electrostatic spinning method are combined, and the preparation method is simple and easy to implement. The prepared electrostatic spinning fiber is used as an inner layer of a protective garment, can resist bacteria, inhibit bacterial organisms and prevent external foreign matters and bacteria from invading a human body, and has good killing and inhibiting effects on the bacteria and the bacterial organisms, and the diaphragm has a porous structure and aperture gradient and has good air permeability.

A temperature-resistant polymer composition comprising: a. poly-2,5-benzimidazole having an inherent viscosity (IV) between 1.0 dL / g and 2.5 dL / g; and b. at least one binder having a glass transition temperature lower than that of the poly-2,5-benzimidazole and having an inherent viscosity in the range of 0.2 dL / g and 1.5 dL / g, which is subjected to compression at a temperature in the range of 400 °C to 600 °C and a pressure in the range of 689,475.72 Pa (1000 psi) to 689,475.29 Pa (10000 psi), wherein the composition is characterized by: i. a glass transition temperature in the range of 150 to 480 °C; and ii. a ratio of poly-2,5-benzimidazole to binder in a range between 95:5 and 5:95.

This invention discloses a low-functionality photocurable resin and its preparation method, comprising: dissolving polybenzimidazole in a polar aprotic solvent in an inert gas atmosphere to obtain a polybenzimidazole solution; adding sodium hydride in a molar amount equal to 0.8–1.2 times the molar amount of the polybenzimidazole resin to the polybenzimidazole solution, reacting the mixture, then adding allyl bromide in a molar amount equal to 0.8–1.2 times the molar amount of the polybenzimidazole resin, reacting again to obtain a polybenzimidazole prepolymer; dissolving the polybenzimidazole prepolymer in a polar aprotic solvent, adding a crosslinking agent and a photoinitiator, and mixing to obtain a photocurable resin solution; irradiating the photocurable resin solution with ultraviolet light, and drying to obtain a photocurable resin with a functionality of 20%–44%. This invention features a low allyl content, allowing for the curing of aromatic resins with less crosslinking agent, and the cured resin exhibits excellent heat resistance and ultra-high mechanical strength.

The invention belongs to the technical field of flow batteries, and discloses a porous polybenzimidazole membrane, a preparation method thereof and a flow battery, the preparation method comprises the following steps: S1, carrying out nucleophilic substitution reaction on polybenzimidazole and a functional compound to obtain polybenzimidazole grafted with a functional side chain; s2, coating the casting film solution containing the polybenzimidazole grafted with the functional side chain to form a wet film; and S3, carrying out primary shaping on the wet film through pre-drying, and then carrying out heat treatment and pore forming to obtain the porous polybenzimidazole film, the porous polybenzimidazole membrane prepared by the preparation method provided by the invention has excellent conductivity, relatively high selectivity and good mechanical properties, and can fully meet the requirements of an ion conduction membrane for a flow battery.

The present invention provides an ion exchange membrane that has excellent electrolyte resistance and battery characteristics, and facilitates the manufacture of electrochemical cells. [Solution] An ion exchange membrane comprising a polybenzimidazole or a derivative thereof represented by formula (1), wherein the ion exchange membrane comprises a dense layer and a porous layer, the dense layer is provided at either end of the porous layer, and the thickness of the dense layer is 0.1 to 10 μm. JPEG2026104048000009.jpg46146 (In general formula (1), R 1 R is a tetravalent aromatic unit that can form an imidazole ring. 2 (where X represents a divalent aromatic group, and Y represents a group containing an anionic functional group, and Y represents a group containing a hydrogen atom or a cationic functional group.)

This invention relates to a high-temperature resistant industrial coating and its preparation method. The method includes: amylating Fe3O4 nanoparticles; grafting the amylated Fe3O4 nanoparticles with polybenzimidazole to obtain PBI-g-Fe3O4 composite particles; in-situ growing MOF to form polyMOF; and surface modification with a hydrophilic silane coupling agent to obtain a hydrophilic modified polyMOF; simultaneously, co-grafting silica nanoparticles with an aminosilane coupling agent and a long-chain alkylsilane coupling agent to obtain a synergist; finally, dispersing all components in an aqueous polyester resin varnish to prepare a composite coating. This invention achieves stable dispersion and strong interfacial bonding of polyMOF in aqueous polyester through a multi-level chemical bonding structure. The synergist synergistically provides curing and defoaming effects. The resulting coating exhibits grade 0 adhesion, excellent defoaming performance, a pencil hardness of 3H, and a temperature resistance limit of 640℃, showing broad application prospects in the field of high-temperature protection.

The invention belongs to the technical field of gas separation membranes, and relates to a blended gas separation membrane containing benzocyclobutene polyimide and a preparation method of the blended gas separation membrane. The blended composite gas separation membrane comprises benzocyclobutenyl polyimide and polybenzimidazole, wherein the polybenzimidazole contains a Troger base. The blended composite gas separation membrane provided by the invention has excellent gas permeability coefficient and gas selectivity, is easy to process and form and simple in preparation process, and has a wide application prospect in the field of gas separation membranes.

The invention belongs to the technical field of fuel cell proton exchange membrane materials, and relates to a sulfonated polybenzimidazole grafted polyimide proton exchange membrane and a preparation method thereof. The preparation method comprises the following steps: firstly, synthesizing an amino-terminated sulfonated polybenzimidazole prepolymer and carboxyl-containing polyimide, and then forming a branched chain structure through an imidazolation reaction. The grafting modification can introduce a specific molecule or polymer chain into the proton exchange membrane, so that proton exchange sites on the surface of the membrane are increased, the transmission path of protons in the membrane is improved, and the proton conduction performance of the membrane is improved. The introduction of a grafting chain can provide a larger free volume, and adsorption sites of PA are simply and effectively increased, so that the adsorption capacity and retention capacity of PA are increased. A molecular main chain simultaneously contains a polybenzimidazole structure and a polyimide structure, so that the characteristics of the two polymers can be well combined, the N-H bond of the polybenzimidazole is not lost during grafting in the imidazolation reaction, and the condition that the proton conductivity is reduced due to the loss of N-H is avoided.

The application relates to a preparation method of a phosphoric acid / cystine functionalized MXene / polybenzimidazole composite high-temperature proton exchange membrane for high-temperature fuel cells, and relates to a preparation method of a high-temperature proton exchange membrane.The application aims to solve the problem of insufficient oxidation resistance of existing fuel cell proton exchange membranes, and the method is as follows: 1, preparing polybenzimidazole; 2, preparing cystine functionalized MXene; 3, preparing a proton exchange membrane in which the cystine functionalized MXene is compounded with OPBI, and then impregnating in a phosphoric acid solution, and the preparation is completed.The application designs the application of a cystine functionalized MXene / polybenzimidazole composite membrane for high-temperature fuel cells in HT-PEM, improves the conductivity and oxidation resistance of the proton exchange membrane, provides a basis for developing a novel and efficient HT-PEM, and the application is applied to the technical field of proton exchange membrane fuel cells.

The invention relates to a preparation method of furan-containing polybenzimidazole (PBI), in particular to a method for preparing furan-containing polybenzimidazole (PBI) by using bio-based furandicarboxylic acid (FDCA) as a diacid monomer instead of a traditional petroleum-based monomer and by using specific aromatic tetramine including 3, 3 ', 5'-tetracarboxylic acid (FDCA) as a diacid monomer. The novel polybenzimidazole polymer is synthesized by the following steps of: reacting 3, 3 '-diaminobenzidine, 3, 3', 4, 4 '-tetraamino diphenyl ether or 3, 3', 4, 4 '-tetraamino diphenyl sulfone at 150-160 DEG C for 2-4 hours under the protection of nitrogen in the presence of an ionic liquid solvent and a dehydrating agent phosphorus pentoxide, and reacting at 165-215 DEG C for 4-30 hours. The invention solves the problems of high processing difficulty, high cost and fossil raw material dependence of the traditional petroleum-based PBI.

The invention discloses a cathode catalyst slurry introduced with serine polybenzimidazole and a preparation method of the cathode catalyst slurry, and the preparation method comprises the following steps: step 1, taking serine and polybenzimidazole as reactants, and carrying out condensation reaction to obtain the serine polybenzimidazole; and step 2, mixing the serine polybenzimidazole, a binder and a catalyst to obtain the cathode catalyst slurry introduced with the serine polybenzimidazole. According to the high-temperature proton exchange membrane fuel cell, ionomer serine polybenzimidazole is introduced into the cathode catalyst layer, hydroxyl on the ionomer serine polybenzimidazole can be cross-linked with phosphoric acid in a high-temperature environment of the high-temperature proton exchange membrane fuel cell, and phosphoric acid is fixed on the ionomer serine polybenzimidazole, so that adsorption of phosphoric acid to Pt active sites is reduced; meanwhile, migration loss of phosphoric acid in the cathode catalyst layer is reduced, distribution of phosphoric acid in the catalyst layer is adjusted, proton conduction of phosphoric acid is improved, and the output power and stability of the HT-PEMFC are improved.

The application discloses an integrated polybenzimidazole gradient membrane and a preparation method and application thereof. The preparation method comprises the following steps: applying a first solution containing polybenzimidazole, a polar solvent and a small-molecule sacrificial template to a substrate surface, removing the polar solvent, forming a dense small-molecule solvated polymer support layer, applying a second solution containing polybenzimidazole and a polar solvent to the surface of the small-molecule solvated polymer support layer, removing the polar solvent to form a screening layer, and fusing the small-molecule solvated polymer support layer and the screening layer to form an integrated structure, thereby obtaining an integrated polybenzimidazole membrane. In-situ etching treatment is performed to obtain an integrated polybenzimidazole gradient membrane. According to the application, a high-selectivity separation thin layer is constructed on the surface of the polymer support layer, the hydrophilic narrow ion channel size can ensure ion screening, the trade-off effect of conductivity and selectivity is broken through, and the membrane has high ion conductivity, high mechanical property, high ion selectivity and high stability.

The invention belongs to the technical field of proton conducting membrane preparation, and particularly relates to a preparation method of a polybenzimidazole membrane with flexibility and proton conductivity. The preparation method comprises the following steps: dissolving polybenzimidazole resin in a low-boiling-point high-polarity aprotic solvent, adding a high-boiling-point thermal expansion agent and continuously stirring in a swelling state of the polybenzimidazole resin, blade-coating the surface of a glass plate with the prepared resin solution, carrying out heat treatment at a certain temperature, and evaporating the low-boiling-point solvent to obtain a film; putting the obtained film into a leaching solution to leach the thermal expansion agent; and carrying out heat treatment on the retreated film to obtain the polybenzimidazole membrane with both flexibility and proton conductivity. In the preparation process, the cross-linking effect between molecular chains is weakened by controlling the phase inversion temperature, the boiling point of the solvent and the expansion characteristic of the thermal expansion agent, the rigid structure of the polybenzimidazole membrane is relaxed, meanwhile, more free volume is provided for proton conduction, the problems of poor proton conductivity and flexibility of the polybenzimidazole membrane are solved, the operation is simple, and the preparation method is suitable for industrial production. The method is suitable for large-scale production.

The invention relates to the field of fabric manufacturing, in particular to a fireproof fabric, a preparation method and a determination method of the fireproof fabric for comprehensive clothes. The fireproof fabric comprises a surface fabric and an inner fabric; the surface fabric and the inner fabric are the same in warp density, weft density and mass per unit area; an air layer is arranged between the surface fabric and the inner fabric; the surface layer fabric is made of any one of polybenzimidazole, polyimide, para-aramid and meta-aramid, and the inner layer fabric is made of any one of para-aramid and meta-aramid. The surface fabric and the inner fabric of the fireproof fabric are obtained by weaving according to corresponding pattern shapes, and the fireproof fabric with excellent comprehensive performance can be determined through the method for determining the fireproof fabric for comprehensive clothes, so that the flame-retardant and heat-insulating performance and the like of the fireproof fabric are improved.

The present invention addresses the problem of improving carbon fiber productivity.　This method for producing fibers comprises a step for producing carbon fiber precursor fibers by solution spinning using a spinning dope that is a mixed solution comprising a low-molecular-weight carbon compound containing pitch, a high-molecular-weight carbon compound containing a polybenzimidazole derivative, and a solvent.

The fluorinated modified zirconium-based metal organic framework / grafted sulfonated polybenzimidazole composite membrane for the all-vanadium redox flow battery is firstly provided, the fluorinated modified zirconium-based metal organic framework (F-MOF 801) in the composite membrane accounts for 1-5 wt%, and a rigid side chain with a sulfonic acid group and the F-MOF 801 are introduced into the prepared sPBIA5-FMx membrane, so that the composite membrane is prepared. The composite membrane constructs more proton transmission channels in a system, and proton transmission and transfer are promoted. Besides, through size screening of the F-MOF 801 and Tongnan rejection of the polymer, permeation of vanadium ions can be effectively prevented, and the ion selectivity of the composite proton exchange membrane can be enhanced. The invention also provides a preparation method of the fluorinated modified zirconium-based metal organic framework / grafted sulfonated polybenzimidazole composite membrane for the all-vanadium redox flow battery. The sPBIA5-FMx membrane is prepared by grafting, doping and a tape casting method. The formed composite proton exchange membrane is excellent in electrochemical performance and controllable in cost, has a production prospect and can be applied to the field of vanadium redox flow batteries.

This invention proposes a polybenzimidazole microporous ion-conducting membrane and its one-step electrospray preparation method. Polybenzimidazole electrospray solutions are prepared using organic solvents with different boiling points. Electrospray parameters are adjusted under a high-voltage electrostatic field, and the polybenzimidazole electrospray solution is dispersed into nanodroplets using this field. A receiving roller rotates to spread and layer the droplets, followed by rapid drying and solidification, directly preparing the polybenzimidazole microporous membrane. This invention can directly prepare microporous membranes using non-ionic polymer materials, and the membrane preparation process is simple and easily scaled up. It overcomes the problem of high mass transfer resistance of non-ionic polymers, enabling highly selective proton conduction. Simultaneously, the high stability of non-ionic polymers improves the oxidative stability and mechanical strength of the ion-conducting membrane, showing broad application prospects in the field of new energy storage flow batteries.