35results about How to "Good resistance to vanadium" patented technology

The invention relates to the field of membrane electrodes for all vanadium redox flow batteries (VRB), particularly to a preparation method of an integrated composite membrane for all vanadium redox flow batteries. According to the present invention, the performances of the all vanadium redox flow batteries are determined by the voltage efficiency and the current efficiency, wherein the ohmic polarization can cause the voltage loss of the battery so as to affect the voltage efficiency; the integrated composite membrane is prepared by closely combining the electrode and the separation membraneso as to effectively reduce the internal resistance of the battery, reduce the polarization loss of the battery, and improve the performance of the VFB; and the prepared membrane electrode has advantages of good vanadium resistance, good mechanical performance and good electrical conductivity, can improve the performance of the single VRB battery, and can be used in the field of all vanadium redox flow batteries.

The invention discloses poly(2-hydroxyethyl methacrylate) and an anion exchange membrane for a vanadium battery. Poly(2-hydroxyethyl methacrylate) has a structure as shown in the formula (I). The substrate of the anion exchange membrane for the vanadium battery is a hydrophobic porous membrane, the surface of which is covered with a layer of poly(2-hydroxyethyl methacrylate). Poly(2-hydroxyethyl methacrylate) provided by the invention can be prepared into a membrane which can be used in the field of vanadium redox flow batteries, and has good vanadium resistance, proton conductivity, mechanical properties, chemical stability and film forming performance. The membrane conductivity reaches the magnitude of 10<-2>S / cm. The vanadium ion permeability reaches 10<-7>cm<2> / min. In addition, the preparation method of the anion exchange membrane for the vanadium battery has advantages of simple and practicable preparation process and low cost, is suitable for industrial production, and is environmentally friendly.

The invention discloses an ion-exchange hybrid membrane for a vanadium battery and a preparation method thereof, which is composed of silicon dioxide particles coated with acrylic acid and acrylamide copolymer and sulfonated polyether ether ketone, and is formed by casting process. The membrane also includes the following steps: S1: preparing a sulfonated polyether ether ketone solution; S2: preparing pretreated nano-silica; S3: preparing polymer-modified silica core-shell particles; S4: preparing sulfonated polyether ether Ketone / polymer modified silica solution; S4: The ion-exchange hybrid membrane for vanadium battery was prepared. The invention can reduce the cost of the membrane, effectively improve the vanadium blocking ability, and at the same time, the polymer coated on the surface of the silicon dioxide contains a large amount of carboxyl groups and amino groups, which can increase the proton transmission density and maintain its high proton conductivity.

The invention relates to a preparation method of a composite membrane, which belongs to the field of ion membrane preparation. Use perfluorosulfonic acid resin with good chemical stability as the main membrane material, mix polymers with different functions, dissolve the resin through organic solvents to obtain slurry, add additives, mix uniformly to form a gel material; put the gel material into Extruded in the extruder, the formed film is put into the environment of different temperature ranges, and the different temperature ranges are gradually reduced from high to low, and the film after gradient heat treatment enters the extraction agent for extraction, takes out the film and washes it in deionized water, heat Roll calendering and winding to obtain a porous ion exchange composite membrane. The continuous preparation process of the composite membrane of the present invention is simple, and the prepared membrane has low swelling, good dimensional stability, high mechanical strength, low vanadium ion permeability, good chemical and thermal stability, and is suitable for all-vanadium redox flow batteries. The operation is simple, and the requirements for equipment and operators are not high.

A mixed matrix type cation exchange membrane and a preparation method thereof. The cation membrane is based on a sulfonated modified polymer material and doped with Schiff base type covalent organic framework materials loaded with different functional groups. During the preparation, the monomer preparation and polymerization of the covalent organic framework material, the sulfonation modification of the polymer, the uniform mixing of the covalent organic framework material and the sulfonated polymer, and the extension of the membrane are carried out, and finally the cation exchange membrane is obtained by acid treatment. . Based on its rigid porous structure, the covalent organic framework material can effectively improve the vanadium barrier performance of the membrane; the organic porous structure of the covalent organic framework and different functional modifications can partially compensate the loss of the proton conductivity of the membrane caused by the introduction of particles; its rigidity The framework can significantly inhibit swelling in the membrane and improve the tensile strength of the membrane; COFs are composed of organic structures, which can promote the compatibility between sulfonated polymers and covalent organic framework materials; polymers as substrates can improve the synthesis of covalent organic framework materials. Membrane performance, so that it has better mechanical strength.

The invention belongs to the technical field of anion exchange membranes, aims to improve the ion transfer performance and dimensional stability of anion exchange membranes, and provides a polypiperazinium functionalized anion exchange membrane and a preparation method thereof. A polypiperazinium-functionalized polymer with good dimensional stability and mechanical properties is obtained, and then the polymer is quaternized to obtain a dopiperazinium-functionalized polymer, and a film is formed. The prepared membrane has good dimensional stability and good ion conductivity, and can be applied in neutral and all-vanadium redox flow batteries.

The invention belongs to the field of ion exchange membranes of liquid flow batteries, and more specifically relates to a preparation method of a low-cost all-vanadium redox flow battery diaphragm. It uses ethylene-vinyl alcohol copolymer powder as the base material, grafts with monomers containing cation exchange function and anion exchange function by irradiation, and protonates after film formation to obtain an all-vanadium redox flow battery diaphragm, thus solving the current problem The vanadium redox flow battery separator is expensive and has high vanadium permeability technical problems.

The invention provides a preparation method of an electrolyte separator for the vanadium battery. The preparation method comprises the following steps of 1) preparing quaternary ammonium silane; 2) preparing a polymer; and 3) preparing the separator. The invention also discloses the electrolyte separator, obtained by the preparation method of the electrolyte separator for the vanadium battery, forthe vanadium battery and the vanadium battery employing the electrolyte separator for the vanadium battery as an electrolyte separator. Compared with a traditional quaternary ammonium salt negative ion exchange membrane in the prior art, the electrolyte separator for the vanadium battery, prepared by the method has the advantages of lower cost, better mechanical property, better chemical stability and better thermal stability, more excellent vanadium blocking performance, higher ion conductivity and small deformation, and the application requirement of the electrolyte separator for the vanadium battery is met.

The invention belongs to the technical field of membranes, and provides a polyarylpiperidine amphoteric ion exchange membrane containing no aryl ether bonds and a preparation method thereof. A membrane material contains positive quaternary amine groups and negative sulfonic acid groups and contains no aryl ether bonds. The polyarylpiperidine amphoteric ion exchange membrane has the advantages thatby introducing amphoteric ion groups, the ionic conduction capacity and the vanadium resisting performance of the membrane can be effectively improved, the membrane is high in ionic conductivity andionic selectivity. Besides, when polyarylpiperidine polymers containing no aryl ether bonds are adopted, the stability of the membrane is greatly improved.

The invention relates to the field of membranes for all-vanadium redox flow batteries, in particular to a method for preparing an asymmetric SPEEK / PP / FCB composite membrane suitable for all-vanadium redox flow batteries, which solves the problems existing in the prior art Proton exchange membranes have problems such as poor stability, poor proton conductivity, poor vanadium resistance, and high price. The invention uses low-cost polyether ether copper (PEEK) as a raw material to prepare sulfonated polyether ether copper (SPEEK) through a sulfonation reaction; utilizes carbon materials to prepare functionalized carbon tubes (FCB), and the polypropylene nickel-hydrogen battery The polypropylene (PP) diaphragm was used as the reinforced film, and the SPEEK / PP / FCB composite diaphragm was prepared by film-forming methods such as step-by-step casting, slurry coating, and dipping. The invention breaks through the traditional proton exchange membrane concept, and the prepared composite diaphragm has the advantages of good proton conductivity, vanadium resistance, mechanical properties, chemical stability and excellent VRB battery performance, and is a commercial diaphragm for all-vanadium redox flow battery. opened up new avenues.

The invention discloses an ion exchange membrane for a flow battery. The ion exchange membrane comprises an organic porous membrane and a perfluorosulfonic acid ion exchange resin, wherein the organic porous membrane is used as a matrix and the perfluorosulfonic acid ion exchange resin is infiltrated into holes of the organic porous membrane. According to the invention, prepared from the perfluorosulfonic acid ion exchange resin with good chemical stability and the organic porous membrane, the ion exchange membrane for the flow battery has good chemical stability and good compactness, electrical performance and vanadium blocking performance; the cost of the ion exchange membrane is far lower than that of a perfluorosulfonic acid ion exchange membrane with same thickness. The invention further discloses a preparation method for the ion exchange membrane for the flow battery. The preparation method is simple and reliable, has low requirements on equipment, can easily realize large-batch production and conveniently realize large scale commercialization of a vanadium battery and promotes development of new energies like wind energy and luminous energy.

The invention discloses a continuous preparation method of a porous composite ion membrane, belonging to the technical field of all-vanadium redox flow batteries. The method uses perfluorosulfonic acid resin with good chemical stability as the main film material, adds polymers and additives with different functions, puts it into the hopper of the extruder for melting and plasticization, and extrudes the formed film into several The temperature is lowered in each temperature section, and the temperature is gradually decreased from high to low. The cooled film enters the extraction solution for extraction, and the additives are extracted to form pores. Finally, the extracted film is washed in deionized water and wound into a film. A porous composite ion membrane is obtained. The continuous preparation process of the ion composite membrane in the present invention is simple, and the prepared membrane has low swelling, good dimensional stability, high mechanical strength, low vanadium ion permeability, good chemical and thermal stability, and can be applied to all-vanadium redox solutions The flow battery (VRB) is simple to operate and has low requirements for equipment and operators.