1757 results about "Flow battery" patented technology

The invention discloses a zinc-bromine flow battery multifunctional negative electrode electrolyte and a preparation method thereof, and belongs to the technical field of electrochemical energy storage, and the method comprises the following steps: uniformly stirring and mixing a solvent, deionized water and a cosolvent, adding an electrolyte, stirring until the electrolyte is completely dissolved, then adding a supporting electrolyte and a negative electrode additive, stirring until the supporting electrolyte and the negative electrode additive are completely dissolved, and obtaining the zinc-bromine flow battery multifunctional negative electrode electrolyte. The multifunctional negative electrode electrolyte of the zinc-bromine flow battery is obtained; the negative electrode cosolvent is dimethylformamide; and the negative electrode additive is at least one of saponin and cinnamyl aldehyde. Saponin molecules are adsorbed on the surface of the zinc electrode, and electronegative carboxyl groups of the saponin molecules form an electrostatic repulsion net in an electric double layer, so that zinc ions are forced to be uniformly dispersed, local ion concentration hot spots are eliminated, and dendritic crystal nucleation is inhibited from the source. In cinnamyl aldehyde, the strong electronegativity of oxygen atoms and the electronegativity of aldehyde oxygen are far higher than those of hydrogen, so that electrons are strongly attracted, adjacent carbon atoms are positively charged, polar adsorption sites are formed, the hydrogen evolution reaction is effectively inhibited, and the stability and the cycle life of the battery are greatly improved.

The invention belongs to the technical field of electrochemical energy storage, and discloses a composite bipolar plate for a zinc-bromine flow battery and a preparation method thereof.The preparation method comprises the steps that carbon fibers, ketjen black and graphene dispersion liquid are stirred to be uniform, and a conductive carbon composite material is obtained; a binder, a dispersing agent and the conductive carbon composite material are subjected to ball milling, and a bipolar plate prefabricated material is obtained; carrying out melt blending on the bipolar plate prefabricated material, and extruding to obtain a substrate; and spraying the nitrogen-doped porous carbon material on the surface of a substrate, and performing hot pressing. The graphene, the carbon fibers and the ketjen black are stirred and compounded, the carbon fibers and the ketjen black enter the space between graphene sheet layers, and the ketjen black is attached to the surfaces of the carbon fibers and the graphene, so that the structure not only can prevent the graphene from generating a re-stacking effect in the mixing process, but also can form a'point-line-surface 'ternary interpenetrating high-conductivity network, so that the conductivity of the graphene is improved. According to the preparation method disclosed by the invention, the deposition uniformity of zinc is improved, so that the voltage efficiency and the cycling stability of the battery are improved.

The invention provides a flow battery energy storage power station full life cycle health degree assessment management method. The method comprises the following steps: constructing an initial health reference library, collecting electrochemical parameters through a reference electrode, collecting electrolyte physical parameters and environmental parameters through a sensor, synchronously recording operation and maintenance data, and carrying out time-space synchronization processing; introducing a hierarchical fusion assessment mechanism, assessing data integrity and constructing an attention mechanism model, calculating a dynamic weight according to a parameter relative change rate and a health degree correlation coefficient, generating a weighted feature vector, and predicting a short-term health degree index by adopting a bidirectional long-short-term memory network Bi-LSTM; a particle filter (PF) algorithm is introduced to be combined with a physical parameter drift distance to correct a long-term health degree index, and then a real-time health degree index is output through fuzzy comprehensive evaluation. The method can achieve the linkage evaluation of the health state in the operation period and the full life cycle trend, corrects the long-term SOH through the PF algorithm in combination with the physical parameter drift distance, and reduces the error of long-term prediction.

The invention discloses an aqueous flow battery negative electrode electrolyte based on water-soluble organic disulfide, an application of the aqueous flow battery negative electrode electrolyte and an aqueous flow battery, and belongs to the field of flow batteries. The negative electrode electrolyte comprises a water-soluble aliphatic organic disulfide, a catalyst, a supporting electrolyte and water, wherein the general formula of the water-soluble aliphatic organic disulphide is R-S-S-R, wherein R is alkyl of which the end part contains a hydrophilic group; the catalyst is one or a combination of two of selenium, sulfur and tellurium. The obtained negative electrode electrolyte is used in the flow battery, the flow battery has high energy density, excellent rate capability and excellent long cycle stability, and the cycle capacity retention rate of 2000 cycles is still greater than 95%; meanwhile, the cost is low, and the application prospect is wide.

The utility model provides a tubular flow battery liquid storage tank which comprises an electrolyte liquid storage tank body, a turbulent flow mixing part is arranged at the bottom of the electrolyte liquid storage tank body, the liquid outlet end of the turbulent flow mixing part is connected to a liquid outlet pipe, the electrolyte liquid storage tank body is filled with electrolyte, and the electrolyte flows to the liquid outlet pipe through the turbulent flow mixing part. And a plurality of inlet ends are arranged on the turbulent flow mixing part, and the multiple inlet ends are used for carrying out turbulent flow mixing on the electrolyte filled in the electrolyte storage tank body. According to the tubular liquid storage tank for the flow battery disclosed by the utility model, a plurality of inlet ends are arranged aiming at a square groove liquid storage tank which is most commonly used by a prefabricated cabin type flow battery, so that an electrolyte can form vortexes in a plurality of areas in a flowing process in the tank, and the electrolyte can be fully mixed to reduce flowing dead zones; the mixing degree and turbulence degree of liquid in the tank are improved, a flowing dead zone is avoided, and the utilization rate of electrolyte is improved.

The invention discloses an all-vanadium redox flow battery positive and negative electrode storage tank liquid level automatic balance control device which comprises a positive electrode electrolyte storage tank, a negative electrode electrolyte storage tank and a galvanic pile, a first circulation loop is formed between the positive electrode electrolyte storage tank and the galvanic pile, and a second circulation loop is formed between the negative electrode electrolyte storage tank and the galvanic pile. Venturi tubes are arranged on the positive electrode electrolyte return pipeline and the negative electrode electrolyte return pipeline, liquid pumping holes of the Venturi tubes are communicated with the negative electrode electrolyte storage tank and the positive electrode electrolyte storage tank through an electrolyte pumping pipeline, and a liquid level monitoring device is arranged on the electrolyte pumping pipeline. The venturi tube is communicated with the electrolyte suction pipeline, and redundant electrolyte in one electrolyte storage tank is sucked into the other electrolyte storage tank by means of pressure difference generated by the venturi tube, so that the design of the positive and negative electrolyte storage tanks is not limited by the relative height of the electrolyte level, and the space of the storage tanks can be fully utilized; the integration level of the battery system is improved, and the occupied area is reduced.

The invention relates to a method and device for determining the state of health of a flow battery, and relates to the technical field of flow batteries, and the method comprises the following steps: obtaining a plurality of operation parameters of the flow battery; the multiple operation parameters are input into a health feature extraction model, multiple health state parameters are obtained, the health feature extraction model is coupled with a spatial feature extraction module and a time sequence feature extraction module, and the spatial feature extraction module is used for extracting short-term coupling relations and fluctuation features of the multiple operation parameters; the time sequence feature extraction module is used for extracting a long-term dependency relationship and evolution features of a plurality of operation parameters; inputting the plurality of health state parameters into a state evaluation model to obtain an initial health index of the flow battery; obtaining a correction coefficient corresponding to the operation condition of the flow battery, wherein the correction coefficient is used for representing the influence degree of the operation condition on the aging rate of the flow battery; and determining the health state of the flow battery according to the initial health index and the correction coefficient.

The invention discloses a preparation method of a modified zinc-bromine flow battery carbon felt negative electrode and the carbon felt negative electrode prepared by the method, and belongs to the field of zinc-bromine flow batteries. According to the method, after the carbon felt is soaked in a mixed solution of cuprous sulfate, water and acetonitrile, the acetonitrile is gradually evaporated from the solution through heating, the cuprous sulfate is gradually subjected to disproportionation reaction, and the copper elementary substance generated by the disproportionation reaction of the cuprous sulfate is deposited on the surface of the carbon felt, so that the purpose of loading the modified carbon felt with the copper elementary substance is achieved. The copper elementary substance is relatively stable in chemical property and has good zinc affinity, and the copper elementary substance is loaded on the surface of the carbon felt, so that the overpotential of zinc nucleation can be reduced, and reaction active sites on the surface of the carbon felt are increased. Besides, relatively strong acting force exists between copper and zinc, so that uniform deposition / stripping of zinc in the charging and discharging process is facilitated, a more uniform zinc deposition layer is formed on the surface of the carbon felt, formation of zinc dendrites is reduced, and the electrochemical performance of the zinc-bromine flow battery is improved.

The invention discloses a preparation method and application of a zinc-bromine flow battery positive electrode material, and belongs to the field of zinc-bromine flow batteries. The preparation method comprises the following steps: firstly, cleaning and activating a carbon-based three-dimensional conductive network substrate by adopting plasmas, performing oxygen / argon plasma etching, and performing chemical vapor deposition on carbon to prepare three-dimensional porous carbon; then growing a metal oxide nanocrystalline array on the three-dimensional porous carbon by a hydrothermal method, and carrying out ammonia gas calcination to convert the metal oxide nanocrystalline array into a metal nitride nanocrystalline array; then preparing an electro-deposition solution containing tin bismuth salt and an aniline-bromine source polymerization solution, and constructing Sn-Bi bimetallic nanoparticles and a polyaniline-bromine complex layer on the metal nitride nanocrystalline array / three-dimensional porous carbon precursor through electro-deposition and electro-polymerization in sequence to finally prepare the high-performance zinc-bromine battery positive electrode material. The positive electrode material has high conductivity, excellent Br2 / Br <-> catalytic activity and structural stability, and the coulombic efficiency, the voltage efficiency and the energy efficiency of the battery are remarkably improved.

The invention discloses a method for detecting the concentration of vanadium ions in an electrolyte of an all-vanadium redox flow battery, and relates to the technical field of batteries. The method for detecting the concentration of vanadium ions in the electrolyte of the all-vanadium redox flow battery comprises the following steps: preparing trivalent and tetravalent vanadium ion reference solutions and trivalent and tetravalent vanadium ion standard solutions with different concentrations; performing baseline correction by using a high-concentration reference solution, setting an absorbance difference value between a corresponding reference cell and a sample cell as 0, and obtaining a trivalent vanadium ion standard curve and a tetravalent vanadium ion standard curve by using standard solutions with different concentration gradients; and detecting the absorbance difference value of the electrolyte stock solution to be detected, and substituting the absorbance difference value into the corresponding standard curve to calculate the vanadium ion concentration. According to the present invention, the detection can be performed without diluting the electrolyte stock solution during the detection, the interference of the adjacent valence vanadium ions is not easily generated, and the detection result is accurate.

The invention belongs to the technical field of flow batteries, and discloses a flexible graphite bipolar plate with a self-repairing function and a preparation method and application thereof. The flexible graphite bipolar plate comprises a flexible graphite-polymer composite matrix, microcapsules and a graphene conductive layer, wherein the graphene conductive layer is arranged on the surface of the flexible graphite-polymer composite matrix; the microcapsule is dispersed in the flexible graphite-polymer composite matrix, the core of the microcapsule is a liquid metal alloy, the liquid metal alloy contains Ga, and the shell of the microcapsule is polyurethane. The microcapsules containing the liquid metal alloy are introduced into the flexible graphite bipolar plate in situ, and when the flexible graphite bipolar plate generates microcracks due to mechanical stress, thermal cycle and the like, the internal microcapsules are broken at the first time to release the liquid metal and fill the cracks, so that the graphite bipolar plate still keeps relatively high mechanical strength and air tightness, and the service life of the flexible graphite bipolar plate is prolonged. Therefore, the conductive stability and the use durability of the flow battery are improved.

The invention discloses a mixed ferrovanadium flow battery based on a redox targeting reaction, and belongs to the technical field of flow batteries. The problems that an existing vanadium-based flow battery is high in cost and limited in energy density are solved. According to the invention, the iron salt with low price is used for partially replacing the vanadium salt with high price, and the cost of the electrolyte is effectively reduced and the capacity and the energy density of the battery are effectively improved through the redox targeting reaction between the ferrovanadium electrolyte double-medium and the solid active substance; the battery keeps stable circulation and coulombic efficiency under relatively high current density, so that large-scale application of the vanadium-based flow battery becomes possible.

The invention discloses an MPC-SP-based all-vanadium redox flow battery constant-power charging and discharging control method, which is applied to an energy storage control system composed of an MPC-SP controller, a PCS and an all-vanadium redox flow battery, and is characterized in that the controller dynamically and accurately adjusts the power output to the battery based on preset SOC interval division, and the power output to the battery is increased along with the increase of the actual SOC value of the battery. The power is increased in stages. Meanwhile, the controller pays attention to the voltage Ud of the battery end all the time, and when the Ud reaches a voltage limiting value, the constant voltage mode is switched, so that the battery is effectively prevented from being damaged due to overhigh voltage. The state-based dynamic power management is much safer, more flexible and more intelligent than traditional fixed constant power control. According to the invention, the change rate of current in the charge-discharge process of the all-vanadium redox flow battery can be reduced, the service life of the battery is prolonged, and the safety is guaranteed.

The invention discloses a zinc-bromine flow battery multifunctional electrolyte and a preparation method thereof, and belongs to the technical field of electrochemical energy storage, and the method comprises the following steps: dissolving an electrolyte in a solvent, and sequentially adding a supporting electrolyte, a positive electrode complexing agent and a positive electrode additive to obtain a positive electrode electrolyte; the positive electrode additive is zinc iodide; i <-> in zinc iodide and Br2 in a Br2 / Br <-> reaction system form mixed halide ions, so that the bromine resistance function is achieved, and the overall conductivity and comprehensive electrochemical performance of the electrolyte are improved; dissolving an electrolyte in a solvent, and sequentially adding a supporting electrolyte and a first negative electrode additive to obtain a negative electrode electrolyte; the first negative electrode additive comprises sodium acetate and sodium citrate; sodium acetate and sodium citrate are combined to form a wide-range buffer system, the pH value of the electrolyte can be dynamically adjusted and stabilized, the long-term stability of the battery is improved, the cycle life is prolonged, and the positive electrode electrolyte and the negative electrode electrolyte form the multifunctional electrolyte for the zinc-bromine flow battery; and the zinc deposition behavior is cooperatively regulated and controlled through sodium salt buffering and ion coordination.

The invention relates to an online capacity balancing method and system for a vanadium redox flow battery system. The method mainly comprises the following steps: detecting the liquid level heights of the positive electrode electrolyte tank and the negative electrode electrolyte tank in real time; the liquid level difference and the liquid level deviation rate of the positive electrode electrolyte tank and the negative electrode electrolyte tank are calculated; an electromagnetic valve control signal is generated according to the liquid level difference and the liquid level deviation rate, and the duty ratio of an electromagnetic valve between the positive electrode electrolyte tank and the negative electrode electrolyte tank is adjusted, so that electrolyte flowing between the positive electrode electrolyte tank and the negative electrode electrolyte tank is controlled, and capacity balance is achieved. According to the method, online capacity balance can be realized in the system operation process, so that the downtime is shortened, the operation process is simplified, the overall operation efficiency of the system is improved, and the problem that the efficiency, the automation degree and the economical efficiency are obviously limited in the prior art is solved.

The invention discloses a zinc-bromine flow battery multifunctional bipolar plate and a preparation method and application thereof.The method comprises the steps that polyaniline is added into a cetyltrimethylammonium bromide ethanol solution, after stirring and ultrasonic treatment, a mixed solution is obtained and sprayed to the positive electrode side of a pretreated polypropylene bipolar plate, and after drying, the zinc-bromine flow battery multifunctional bipolar plate is obtained; the polyaniline modified polypropylene bipolar plate is obtained; the preparation method comprises the following steps: dissolving beta-cyclodextrin in a NaOH solution, adding epoxy chloropropane, stirring for reaction, washing to be neutral, drying, grinding and sieving to obtain a cyclodextrin polymer, dispersing the cyclodextrin polymer in a Nafion solution to obtain a cyclodextrin polymer solution, spraying the cyclodextrin polymer solution on the negative electrode side of a polyaniline modified polypropylene bipolar plate, and drying to obtain the multifunctional bipolar plate of the zinc-bromine flow battery. Polyaniline is loaded on the positive electrode side of the bipolar plate to reduce a bromine permeation source and bromine reaction activation energy, a cyclodextrin polymer Nafion solution is used for modifying and stabilizing the pH value of an electrolyte on the negative electrode side, uniform and compact deposition of zinc is promoted, formation of sharp dendrites is reduced, and the electrochemical performance and long-term stability of the battery are improved.

The invention relates to a liquid flow battery electrolyte storage device, and relates to the technical field of liquid flow battery electrolytes.The liquid flow battery electrolyte storage device comprises a tank shell and a heat exchange pipe, a spiral storage pipe barrel arranged in the vertical direction is arranged in the tank shell, electrolyte is arranged in the storage pipe barrel, the storage pipe barrel is connected with a liquid pump, the heat exchange pipe is spiral, and the heat exchange pipe is connected with the liquid pump. The storage pipe barrel is arranged vertically in a spiral mode and arranged outside the storage pipe barrel in a sleeving mode, heat exchange liquid is arranged in the heat exchange pipe, the heat exchange pipe is connected with a liquid supply circulating device, the flowing direction of the electrolyte is opposite to that of the heat exchange liquid, the storage pipe barrel is vertically arranged in a spiral mode, the electrolyte in the storage pipe barrel can form ordered layering in the storage pipe barrel, and therefore the heat exchange effect is improved. According to the utility model, the generation of a flowing dead zone is avoided, the occurrence of a side reaction, namely a hydrogen evolution reaction, caused by the mixing of two different ions is also reduced, the heat exchange area is increased, countercurrent flow heat exchange is realized, and the heat exchange efficiency of the device is further ensured.

The invention specifically discloses an all-vanadium redox flow battery multi-target operation optimization control method based on a particle swarm algorithm, and relates to the technical field of all-vanadium redox flow battery energy storage system control. The method comprises the following steps: firstly, collecting and preprocessing real-time operation data of a VRB system; constructing a multi-objective optimization function including charging time, input / output energy and pump energy consumption in a charging and discharging mode; taking the charge-discharge current density and the electrolyte flow as decision variables, taking the temperature, the voltage and the SOC value as constraint conditions, and carrying out optimization solving through a particle swarm optimization algorithm to obtain optimal parameters; and finally, realizing full-process automatic closed-loop control by combining data acquisition, function calculation, parameter adjustment and simulation feedback. According to the method, through multi-target dynamic optimization, decision variable and constraint condition and closed-loop adaptive control, collaborative optimization of shortening the charging time of the all-vanadium redox flow battery, improving the system efficiency and reducing the pump energy consumption is realized, and the operation safety, stability and complex scene adaptability of the system are enhanced.

The invention discloses a carbon felt electrode for a zinc-bromine flow battery as well as a preparation method and application, and belongs to the technical field of zinc-bromine flow battery production, the method comprises the following steps: immersing a carbon felt into an acid solution for chemical etching, etching uniform grooves in the carbon fiber surface of the carbon felt, cleaning and drying to obtain a pretreated carbon felt; the preparation method comprises the following steps: dissolving tin salt and nickel salt in deionized water, and adding a hydrolysis inhibitor to obtain a precursor solution; and immersing the pretreated carbon felt into the precursor solution, carrying out electro-deposition under constant current by adopting a direct-current power supply by taking the re-selected untreated carbon felt as a counter electrode, washing the pretreated carbon felt subjected to electro-deposition with water, and drying for the second time to obtain the carbon felt electrode for the zinc-bromine flow battery. By utilizing the zinc affinity of Sn and Ni, zinc is preferentially deposited on Sn and Ni sites of the carbon felt electrode, the deposition depth is obviously enlarged, the zinc deposition space is optimized, the zinc deposition area capacity is effectively improved, and the problem that the surface capacity of the carbon felt electrode is limited is solved.

The invention belongs to the technical field of bipolar plate materials for flow batteries, relates to a composite bipolar plate material as well as a preparation method and application thereof, and is suitable for bipolar plate materials for flow batteries. According to the bipolar plate of the flow battery, the three-dimensional porous foam metal is used as the matrix and is positioned in the middle layer, so that the overall strength and toughness of the bipolar plate can be improved, and meanwhile, the problems of local overheating and the like caused by non-uniform heating of zinc deposition in a charge-discharge test of a sedimentary flow battery such as a zinc ferroelectric pile are solved, so that the long-term operation of the battery is influenced; and the porous foam metal can well transfer heat and enable the heat to be uniformly distributed, so that the porous foam metal has a good application prospect in the sedimentary flow battery. The composite material is adhered to the two sides of the bipolar plate through a hot pressing process, so that the corrosion resistance of the bipolar plate can be ensured, meanwhile, the foam metal constructs an efficient conductive network in the bipolar plate, the foam metal and the composite material can form a synergistic conductive effect, and the electron transmission capability of the bipolar plate is also improved; in the manufacturing process, carbon paper / carbon fiber cloth is added to the upper side and the lower side at the same time, so that the surface resistance of the bipolar plate is reduced, and the performance of the bipolar plate in a flow battery is further improved.

A flow cell battery that includes at least one electrochemical cell. The electrochemical cell includes: an ion exchange membrane; a 1 mm to 4 mm thick anode; an anode current collector; a first bipolar plate disposed between the anode and the anode current collector; a first flow frame that defines first flow channels; a first tank including an anolyte that includes V4+ and V5+; a first pump to flow the anolyte from the first tank into the first flow channels; a 1 mm to 4 mm thick cathode; a cathode current collector; a second bipolar plate disposed between the cathode and the cathode current collector; a second flow frame that defines second flow channels; a second tank including a catholyte that includes V2+ and V3+; and a second pump to flow the catholyte from the second tank into the second flow channels.

The invention discloses an intelligent operation and maintenance system and method based on flow battery digital twinning, and relates to the technical field of flow battery energy storage. According to the method, through multi-source heterogeneous data fusion, electrical, fluid and environmental parameters and image data are collected and uniformly processed; constructing a mixed index database to add spatio-temporal information; optimizing the neural network through a PSO-BP algorithm to generate a space fusion model; constructing a multi-physics field real-time simulation model by combining data driving and a mechanism model; and finally, dynamic interaction and fault prediction of the physical and virtual systems are realized through three-dimensional virtual mapping. The system comprises a data preprocessing module, a mixed index database and the like. Unified fusion and efficient management of multi-source heterogeneous data are achieved, and the problem of data fragmentation is solved; a multi-physical-field state is simulated in real time through a digital twinning technology, and a fault is accurately predicted; and preventive maintenance is supported, the operation and maintenance cost is reduced, and the safety and economic benefits of the flow battery system are improved.

The invention discloses a flow battery proton exchange membrane, and particularly discloses a flow battery proton exchange membrane which is prepared by sequentially soaking a substrate material in a water phase solution and an organic phase solution, generating a skin layer film through interfacial polymerization, and then performing ultraviolet irradiation and post-treatment. 3, 3 '-diaminobiphenyl and an organic monomer are subjected to interfacial polymerization reaction on the surface of a substrate material, the proton exchange membrane with a cross-linked structure is formed through ultraviolet irradiation, and the proton exchange membrane is thin in separation layer, resistant to acid and alkali and good in chemical stability. The proton exchange membrane for the redox flow battery can be applied to an all-vanadium redox flow battery, an iron / chromium redox flow battery, a zinc / bromine redox flow battery, a sulfur / bromine redox flow battery, a sulfur / iron redox flow battery, a vanadium / bromine redox flow battery or a vanadium / iron redox flow battery.

The invention relates to the technical field of flow batteries, in particular to a flow battery electrode frame assembly and a battery unit.The flow battery electrode frame assembly comprises a mother frame, a public flow channel is formed in the mother frame, an internal flow channel set and an electrode cavity are formed in the mother frame, and the internal flow channel set communicates with the public flow channel and the electrode cavity; when the two adjacent mother frames are attached face to face, the internal flow channel sets on the two mother frames coincide and communicate with each other in the thickness direction of the mother frames, and the common flow channels on the two mother frames communicate with each other. The son frame is arranged on the mother frame; and the bipolar plate is arranged between the secondary frame and the primary frame. The electrode frame has the effect of increasing the depth of the flow channel within the limited thickness of the electrode frame.

The invention relates to the field of methods or devices for directly converting chemical energy into electric energy, and provides a vanadium ion valence state automatic adjusting system and method and an all-vanadium redox flow battery system. The automatic adjusting system comprises an optical detection module, a central processing module and a reducing agent adding executing mechanism. The optical detection module collects electrolyte from the running all-vanadium redox flow battery and detects light absorption data, and the central processing module determines the concentration of multivalent vanadium ions according to the light absorption data and calculates the additive amount of a reducing agent; and the reducing agent adding executing mechanism adds a reducing agent into the all-vanadium redox flow battery according to the reducing agent adding amount. According to the invention, online real-time monitoring and accurate adjustment of the vanadium ion valence state of the all-vanadium redox flow battery in operation are realized, and the problems of lagging off-line detection response, frequent manual intervention, high cost of an electrolytic regeneration method and the like in the prior art are solved, so that the efficient operation of the all-vanadium redox flow battery is maintained, the coulombic efficiency is improved, the attenuation rate is reduced, and the manual maintenance is reduced.

The invention relates to the technical field of all-vanadium redox flow batteries, and discloses a supported electrolyte of all-vanadium redox flow battery positive and negative electrolyte and a preparation method thereof, and the supported electrolyte comprises an aqueous solution containing vanadium ions, sulfonate ions, sulfate ions and phosphonic acid groups. The sulfonic acid group (-SO3H) has strong polarity and high ionization degree, after the sulfonic acid group (-SO3H) is mixed with the phosphonic acid group (-PO3H2) and sulfuric acid, the ionic environment of the electrolyte can be optimized, the activation energy of V (II) / V (III) and V (IV) / V (V) electricity on electron transfer is reduced, and compared with an existing sulfuric acid supported electrolyte, the reversibility of electrochemical reaction is remarkably improved, and the electrochemical activity of the electrolyte is enhanced; meanwhile, phosphonic acid groups have high complexing ability, can form stable chelates with vanadium ions and can form complexing-dispersing synergy with sulfonic acid groups, the solubility of the vanadium ions is improved, and agglomeration and crystallization of the vanadium ions are inhibited.

The application discloses a carbon nitride / carbon felt electrode for a vanadium redox flow battery and a preparation method thereof, and belongs to the technical field of battery materials. The preparation method comprises the following steps: (1) soaking carbon felt in an ethanol solution containing an iron salt compound and then drying; (2) suspending the dried carbon felt in a closed container, adding a pyrrole monomer, and reacting at a constant temperature under an inert atmosphere to obtain a polypyrrole / carbon felt, which is cleaned and dried; (3) soaking the polypyrrole / carbon felt in an ethanol solution containing a zinc salt compound and then drying; (4) gradually increasing the temperature of the dried polypyrrole / carbon felt under an inert atmosphere to perform high-temperature carbonization, and obtaining carbon nitride / carbon felt; and (5) performing pickling and water washing on the carbon nitride / carbon felt, and obtaining the carbon nitride / carbon felt electrode after drying. In the application, the iron salt is used to catalyze the polymerization and deposition of pyrrole on the surface of the carbon felt, and finally high-temperature carbonization is performed to form various nitrogen-doped structures on the surface of the carbon felt, so that the liquid affinity and the electrochemical reaction activity of the electrode surface are significantly improved, and the energy efficiency of the battery is improved.

The present invention relates to the field of flow batteries, and discloses an electrode frame structure and a flow battery, the electrode frame structure comprises an electrode and an electrode frame, the electrode frame comprises an electrode frame body, an electrolyte reaction zone arranged in the electrode frame body, and an end surface arranged on the outer side of the electrode frame body, the inlet convex block and the outlet convex block are fixedly connected to the outer side of the electrode frame body; under the condition of keeping the active area and the output power of the electrolyte reaction area unchanged, the concentration polarization on the electrolyte reaction area can be reduced only by increasing the length of the electrolyte reaction area and reducing the width of the electrolyte reaction area, the energy efficiency of the battery and the utilization rate of the electrolyte are improved, and the production cost is reduced. The length-width ratio of the electrolyte reaction area is preferably controlled between 3: 1 and 2: 1, the change difficulty and the processing cost of the battery structure are low, and the performance of the battery can be improved at low cost.

The invention relates to an all-vanadium redox flow battery positive electrode electrolyte additive, a preparation method, a positive electrode electrolyte and application, and relates to the technical field of all-vanadium redox flow battery electrolytes.The all-vanadium redox flow battery positive electrode electrolyte additive comprises a main chelating agent, an auxiliary chelating agent, a pH buffering agent and a dispersing agent, the main chelating agent is selected from one or more than two of citric acid, tartaric acid, 1-hydroxyethylidene-1, 1-diphosphonic acid and trisodium methylglycine diacetate, and the auxiliary chelating agent is selected from one or more than two of disodium ethylene diamine tetraacetate, trisodium nitrilotriacetate and tetrasodium glutamate diacetate; the mass ratio of the pH buffering agent to the main chelating agent to the auxiliary chelating agent to the dispersing agent is (3.6-4.1): (0.6-1.5): (2.5-3.2): (1.7-2.5). According to the positive electrode electrolyte additive for the all-vanadium redox flow battery, the electrolyte has a remarkable high-temperature anti-precipitation effect, the energy density and the electrochemical performance are not sacrificed, and the preparation process is simple and controllable.

The application relates to the technical field of all-vanadium redox flow batteries, and discloses an integrated electrode plate and a preparation method and application thereof, which comprises the following steps: mixing and calcining a metal organic framework material and polyvinylpyrrolidone to obtain a porous carbon material; uniformly melting and mixing the porous carbon material, resin and conductive carbon material, and performing die forming to obtain a modified bipolar plate; using silver-coated copper powder as a conductive filler, and using epoxy modified acrylic resin as an organic carrier to prepare ultraviolet light curing silver-coated copper conductive adhesive; and bonding the electrode and the modified bipolar plate through ultraviolet light curing to prepare the integrated electrode plate. The porous carbon is obtained by using a polyvinylpyrrolidone-assisted limited carbonization method, the conductivity of the bipolar plate is improved, epoxy modified acrylic resin is used as the organic carrier, the silver-coated copper powder is uniformly distributed in the organic carrier, the conductivity of the conductive adhesive is improved, and the integrated electrode plate improves the performance of the flow battery.