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

The invention relates to a mixed matrix type cation exchange membrane and a preparation method thereof. The cation exchange membrane takes a sulfonated modified polymer material as a substrate and isdoped with Schiff base type covalent organic framework materials loaded with different functional groups. The preparation method comprises the following steps of: sequentially performing monomer preparation and polymerization of a covalent organic framework material, sulfonation modification of a polymer, uniform mixing of the covalent organic framework material and a sulfonated polymer, and flow-spreading film formation; and finally, performing acid treatment to obtain the cation exchange membrane. The covalent organic framework material can effectively improve the vanadium resistance of themembrane based on the rigid porous structure; the organic porous structure of the covalent organic framework and the different functional modifications can partially compensate the loss of membrane proton conductivity caused by the introduction of particles; the rigid framework can obviously inhibit the swelling in the membrane and can improve the tensile strength of the membrane; COFs is composedof organic structures and can promote compatibility between sulfonated polymers and covalent organic framework materials; and moreover, the polymer as the substrate can improve the film forming performance of the covalent organic framework material, so that the covalent organic framework material has the better mechanical strength.

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 vanadium cell nafion proton membrane and a preparation method thereof. The vanadium cell nafion proton membrane is prepared from a cross-linking substance of nafion resin and polyether amine. The preparation method comprises the following steps: carrying out crosslinking to hydrophilic macromolecular polyether amine and the nafion resin in a solution so as to carry out cross-linking reaction on amino groups at two ends of a hydrophilic macromolecular polyether amine molecular chain and the sulfonic acid group of the nafion resin; and volatilizing a solvent to prepare the hydrophilic cross-linking nafion proton membrane. The proton membrane disclosed by the invention has the characteristics of high compact degree, good vanadium blocking performance, high proton conductivity and high reliability, and the energy efficiency of a pile is effectively improved; and the preparation method is easy to operate and high in production efficiency, and is suitable for mass production.

The invention relates to the field of an ion exchange membrane for an all-vanadium redox flow battery (VRB), in particular to a preparation method of a functional porous polyvinylidene fluoride (PVDF)membrane for the all-vanadium redox flow battery, which solves the problems that a currently used perfluorosulfonic acid proton exchange membrane is high in vanadium ion transmission, expensive in price and the like. The preparation method comprises the steps of adopting the PVDF as a raw material dissolving through an organic solvent, adding an additive, uniformly mixing, coating the uniform solution on a clean glass plate, keeping warm in a drying box for a certain time, and cooling to obtain the PVDF membrane; after forming the membrane, immersing the membrane into a solvent, leaching themixed additive to form holes, modifying the porous membrane, and preparing the functional porous polyvinylidene fluoride (PVDF) membrane. The method provided by the invention is simple in process, andthe prepared membrane is low in soluble inflation, good in size stability, high in mechanical strength, low in vanadium ion permeability, favorable in chemical stability and heat stability, low in price, and applicable to the all-vanadium redox flow battery (VRB).

The invention relates to the field of a diaphragm of an all-vanadium redox flow battery, and concretely relates to an asymmetric SPEEK/PP/FCB composite diaphragm suitable for the all-vanadium redox flow battery, and thereby, the problems of poor stability of a proton exchange membrane, poor conductivity of proton, poor vanadium resistance, and high cost in the prior art are solved. The composite diaphragm breaks through a traditional proton exchange membrane concept, the prepared composite diaphragm has good proton conductivity, vanadium resistance, mechanical properties, chemical stability, and good VRB battery performance, and provides a novel approach for commercialized preparation of the diaphragm of the all-vanadium redox flow battery.

The invention belongs to the field of ion exchange membranes of liquid flow batteries, and particularly relates to a preparation method of a low-cost all-vanadium redox flow battery diaphragm. According to the preparation method, an ethylene-vinyl alcohol copolymer is used as a substrate, and the substrate is subjected to irradiation grafting with a monomer containing a cation exchange function and an anion exchange function, and then protonation is carried out after film forming to obtain the all-vanadium redox flow battery diaphragm, so as to solve the technical problems that the existing vanadium flow battery diaphragm is expensive in price and high in vanadium permeability.

The invention discloses a modified PES (polyether sulfones)-PVP (polyvinylpyrrolidone) hybrid anion exchange membrane for a vanadium redox battery. The modified PES-PVP hybrid anion exchange membrane for the vanadium redox battery is prepared by blending of quaternization modified PES and PVP, wherein the quaternization modified PES is a mixture of quaternary ammonium base type quaternization modified PES and imidazole type quaternization modified PES. By blending of the quaternary ammonium base type quaternization modified PES, the imidazole type quaternization modified PES and the PVP, superior properties of the three are combined. In application to all-vanadium redox flow batteries, the modified PES-PVP hybrid anion exchange membrane has excellent vanadium resistance and ion selection performances and has advantages of high stability, superior mechanical properties, high coulombic efficiency and long service life.

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 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 belongs to the technical field of anion exchange membranes, aims to improve the ion transfer performance and dimensional stability of an anion exchange membrane, and provides a novel polypiperazinium functionalized anion exchange membrane and a preparation method thereof. According to the preparation method, a polypiperazinium-containing functionalized polymer with good dimensional stability and mechanical properties is synthesized, quaternization is carried out on the polymer to obtain the polypiperazinium-containing functionalized polymer, and the polypiperazinium-containing functionalized polymer is made into a membrane. The prepared membrane has relatively good dimensional stability and relatively good ionic conductivity, and can be applied to neutral and all-vanadium redox flow batteries.

The invention relates to the field of ion exchange membranes used for all-vanadium redox flow batteries (VRB), and specifically discloses a preparation method of a composite membrane with a catalytic function for positive and negative electrodes used for the all-vanadium flow batteries. The membrane of a majority of all-vanadium flow batteries has the problem that the requirements, in some aspects, of the batteries can be met so that a proton conduction membrane with excellent overall performance is difficult to obtain, namely the problem is a balance problem between vanadium resistance and conductivity performance. Metal salt with an obvious catalytic function in reactions of the positive and negative electrodes is introduced into two sides of the membrane by adopting a step-by-step tape casting method, and the membrane has the catalytic function, so that the composite membrane with the catalytic function is prepared. The composite membrane prepared by the invention has good vanadium resistance performance, mechanical property and good single VRB battery performance, and the composite membrane can be widely applied to the field of the all-vanadium redox flow batteries.