1682results about "Regenerative fuel cells" 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 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 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 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 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 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 present disclosure relates to organic electrolyte solutions including organic electrolytes (e.g., aromatic imides, ferrocenes, spiro fused compounds, or cyclopropenium compounds), and redox flow batteries and systems including the same.

To provide an ion conductive polymer having improved ion conductivity, and a separation membrane containing the same.SOLUTION: The present disclosure relates to an ion-conducting polymer having a repeat unit comprising a quaternary ammonium and at least one ether group.SELECTED DRAWING: None

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 discloses a method for preparing a vanadium electrolyte by electrochemistry-ultrasonic synergistic reduction of a waste vanadium catalyst in the technical field of solid waste resource utilization, which comprises the following steps of: roasting the waste vanadium catalyst by NaOH and leaching by sulfuric acid, applying 80Hz pulse current by adopting a titanium-based lead dioxide anode and a graphite cathode in a three-chamber electrolytic bath, synchronously starting a 25kHz and 300W ultrasonic field for synergistic reduction, and controlling the reaction temperature to be 35 + / -2 DEG C until the V < 5 + > concentration is less than 0.05 g / L; and then adding a chitosan-tea polyphenol composite stabilizer, and concentrating through a PVDF (Polyvinylidene Fluoride) ultrafiltration membrane to obtain electrolyte with the vanadium concentration of 1.8 mol / L, wherein the molar ratio of V < 4 + > to V < 3 + > is 1: 1.2, Fe < 3 + > is less than 15 ppm, and Al < 3 + > is less than 10 ppm. In the process, the vanadium recovery rate reaches 95.2%, the energy consumption is 2.8 kWh / kg vanadium and is reduced by 65% compared with that of a traditional process, and the cycle life of the electrolyte is prolonged to 1200 times or above.

The invention discloses a method for separating vanadium and iron in a high-iron-vanadium electrolyte. The method comprises the steps of pH regulation and control, iron removal, vanadium extraction and vanadium reverse extraction. In the step of iron removal, an iron ion targeted complexing agent and a solid phase adsorbent are added into the high-iron vanadium electrolyte with the pH adjusted, reaction is conducted for 10-15 min under stirring, then direct filtering is conducted, and low-iron vanadium electrolyte and a solid phase are obtained; in the vanadium extraction step, vanadium in the low-iron vanadium electrolyte is extracted by adopting a mixed solvent of pretreated P204, TBP and sulfonated kerosene, and a vanadium-containing organic solution is obtained; and the vanadium reverse extraction comprises the step of carrying out reverse extraction on the vanadium-containing organic solution through a sulfuric acid solution with the concentration of 2.0-5.0 mol / L to obtain a vanadium electrolyte. The method can be used for treating iron ions in all valence states, particularly ferric ions which are easier to extract than vanadium ions, qualified vanadium electrolyte with the iron ion concentration meeting the industrial standard can be directly obtained after reverse extraction, and a complexing agent and an adsorbent can be recycled.

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 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. A copper organic matter precursor is heated and gasified in a double-temperature-zone tubular furnace, molecules of the partially gasified copper organic matter precursor are loaded to the position where a carbon felt is located by hydrogen and adsorbed on the carbon felt, the copper organic matter precursor reacts with the hydrogen to form a copper elementary substance, and the copper elementary substance is attached to the surface of the carbon felt to form a load. Therefore, the purpose of modifying the carbon felt by loading the copper elementary substance is achieved. According to the method, the obstruction of low conductivity of the loaded oxide on electron transfer in the zinc deposition / stripping process is overcome; inactivation caused by reaction of loaded metal active sites and electrolyte acidic components is avoided; and the problem that the internal fibers of the carbon felt are difficult to uniformly load metal elementary substances or oxide particles due to high surface tension between the metal salt solution and the carbon felt is solved, efficient and uniform loading of the copper elementary substances on the carbon felt is realized, and the negative electrode performance of the zinc-bromine flow battery is remarkably improved.

The invention relates to the technical field of redox flow batteries, and discloses a low-temperature-resistant redox flow battery electrolyte, a preparation method and a zinc-bromine redox flow battery, the low-temperature-resistant redox flow battery electrolyte comprises water, an electrolyte salt, a supporting electrolyte, a 2-phenylbenzopyran type cationic additive and an alcohol solvent. Wherein the 2-phenylbenzopyran type cationic additive has a dual regulation and control function, and can synchronously solve the problems of a multi-bromide shuttle effect and irreversibility of a zinc negative electrode, so that the high-performance zinc-bromine flow battery is constructed. The alcohol solvent not only has little influence on the conductivity and viscosity of the electrolyte, but also can reduce the freezing point of the electrolyte and improve the reaction kinetics of zinc under the low-temperature condition. Through interaction of the alcohol solvent and the 2-phenylbenzopyran type cationic additive, the zinc-bromine flow battery can operate more stably and efficiently in a low-temperature environment, and the problem of low energy efficiency of the zinc-bromine flow battery in the prior art under the low-temperature condition is solved.

The invention belongs to the technical field of electrochemical energy storage, and provides a negative electrode electrolyte, a preparation method thereof and a zinc-bromine flow battery. The negative electrode electrolyte comprises the following components: zinc bromide, supporting electrolyte, a negative electrode additive and water, and the negative electrode additive comprises malic acid; and the concentrations of the zinc bromide, the supporting electrolyte and the malic acid in the negative electrode electrolyte are 2.0 to 2.5 mol / L, 2.0 to 3.0 mol / L and 0.02 to 0.04 mol / L respectively. Zinc dendrites and hydrogen evolution reaction are effectively inhibited, and cooperative improvement of coulombic efficiency, voltage efficiency and energy efficiency is achieved. Therefore, the malic acid is introduced into the negative electrode electrolyte, so that the zinc dendrite and hydrogen evolution reaction in the zinc-bromine flow battery can be effectively inhibited, and the cooperative improvement of coulombic efficiency, voltage efficiency and energy efficiency is realized.

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.

This disclosure provides redox cyclable molecules for energy storage. These molecules belong to either the 4H-pyran-4-ylidene family or include a six-membered aromatic ring with one nitrogen atom at position 1 (pyridinium family) or two nitrogen atoms at positions 1 and 4 (pyrazinium family) or at positions 1 and 3 (pyrimidinium family). Molecules in these families are used as analytes in redox flow batteries.

The invention relates to a flow battery system and an online flow calibration method thereof. The system mainly comprises a controller, an electrolyte storage tank, a flow calibration tank and a galvanic pile, a liquid level sensor is arranged on the flow calibration tank, and a first circulating pump, a pressure sensor and a flowmeter are sequentially arranged on a main circulating pipeline close to one side of an inlet of the galvanic pile in the liquid flow direction. A first electric control valve is arranged on the main circulating pipeline close to one side of the electric pile outlet; the electric pile is connected with the flow calibration tank through a first branch, and a second electric control valve is arranged on the first branch; the flow calibration tank is connected with the electrolyte storage tank through a second branch, and a second circulating pump and a third electric control valve are sequentially arranged on the second branch in the liquid flow direction; and the controller is used for calculating the actual flow in real time and automatically compensating the real-time output value of the flow meter on line. According to the invention, long-term stability and accuracy of electrolyte flow measurement can be ensured.

The invention provides a method for preparing a nearly 3.5-valent vanadium electrolyte by reducing ammonium metavanadate with coke oven gas, which comprises the following steps: (1) reducing and calcining ammonium metavanadate in coke oven gas to obtain a reduced product; (2) carrying out replacement deamination on the reduced product in the step (1) to obtain a nearly 3.5-valent vanadium oxide, wherein the nearly 3.5-valent vanadium oxide contains V4O7; and (3) a mixed sulfuric acid solution and the approximately 3.5-valent vanadium oxide are subjected to a dissolution reaction, and the approximately 3.5-valent vanadium electrolyte is obtained. The process method disclosed by the invention is simple and easy to implement, the approximately 3.5 valence vanadyl sulfate electrolyte product with high vanadium concentration and low ammonia content can be obtained by taking the ammonium metavanadate and the coke oven gas as raw materials, and the application prospect is wide.

The invention belongs to the field of electrochemical energy storage, and discloses an electrode suitable for an organic flow battery and a preparation method of the electrode. The electrode comprises a porous electrode substrate and an amino functional group loaded on the surface of a pore channel, and the electrode substrate is prepared by taking mixed powder of noble metal, rare earth metal and titanium alloy as a raw material. A selective laser melting process is adopted to prepare a porous electrode substrate, and then an electrostatic self-assembly process is adopted to load amino functional groups on the surfaces of pore channels. The electrode has a porous structure with a high specific surface area, and can provide sufficient reaction sites for electrochemical reaction. Meanwhile, the loaded amino functional group can enhance the activity and stability of positive and negative electrode electrochemical substances. The electrode base material comprises a noble metal with catalytic activity and a rare earth metal, and an active rare earth oxide layer doped with a noble metal oxide can be formed on the surface of the electrode after printing. According to the electrode, the energy efficiency of the organic flow battery can be improved, and the stable cycle index and the service life are prolonged on the basis of maintaining the energy efficiency.

The invention relates to the field of all-vanadium redox flow batteries, in particular to a sulfurized polyacrylonitrile-based electrode, a preparation method thereof and application of the sulfurized polyacrylonitrile-based electrode as an all-vanadium redox flow battery negative electrode material. The invention provides a negative electrode of an all-vanadium redox flow battery, which takes a carbon felt electrode as a matrix and is loaded with sulfurized polyacrylonitrile. The sulfurized polyacrylonitrile is used as a negative electrode catalytic material for the all-vanadium redox flow battery, so that the electrocatalytic activity of a negative electrode reaction can be improved, the reaction kinetics is accelerated, and the battery performance is improved. Meanwhile, the sulfurized polyacrylonitrile and the negative electrode matrix carbon felt have the same molecular skeleton, so that the sulfurized polyacrylonitrile can grow on the surface of the carbon felt in situ, the adhesive force of the catalyst sulfurized polyacrylonitrile and the carbon felt is improved, and the cycling stability of the all-vanadium redox flow battery is further improved. In addition, the power density of the all-vanadium redox flow battery under high current density can be improved by using the sulfurized polyacrylonitrile as the negative electrode catalyst.

The invention belongs to the technical field of safety monitoring of energy storage systems, and relates to a monitoring method and system for an all-vanadium redox flow battery with a safe liquid level. According to the technical scheme, the effective sectional area of a safe liquid storage tank is obtained, the quantitative volume is determined, and a theoretical liquid level response benchmark is established according to the ratio; counting the liquid level and conductance noise in the stable baseline section and generating a corresponding error boundary; performing quantitative injection and quantitative extraction active self-inspection on the interlayer, extracting injection / extraction liquid level response amplitude and return difference, and judging whether a monitoring link is healthy or not; and when the link is not healthy, the hidden inner leakage is judged by taking increment and continuity of conductance of the liquid collecting cavity relative to the base line as main evidence. Therefore, electrolyte invasion can still be reliably recognized under the working condition that the safe liquid level change is not obvious or even reverse double-fault covering is achieved, report omission is reduced, and monitoring reproducibility and engineering reliability are improved.