3129 results about "Flow battery" patented technology

The invention relates to the technical field of power supply devices, in particular to an energy-saving optimization method for an electric energy storage device, and the method comprises the steps: fusing a lithium ion battery solid-liquid phase change kinetic equation, a flow battery fluid mechanics equation and a flywheel rotor rigid-flexible coupling equation through a neural differential equation; constructing a dynamic meta-knowledge base containing cross-time scale nonlinear interaction features; performing dynamic parameter compensation on the polarization voltage hysteresis effect and the electrolyte flow resistance coupling effect by using a physical information neural network to generate a decoupled residual feature vector; according to the method, multi-physics field coupling modeling is achieved through the dynamic meta-knowledge base, and the energy efficiency optimization effect of the energy storage device is improved by combining the physical information neural network and the quantum optimization algorithm.

The invention discloses an intelligent energy scheduling method and system for a flow battery, and relates to the technical field of flow batteries, and the method comprises the following steps: collecting energy operation parameters of the flow battery in real time, and dynamically estimating an electrolyte state to obtain multiple pieces of energy state information; a target to be dispatched is set, and a fuzzy control strategy is formulated through retrograde multi-target optimization; executing a fuzzy control strategy to generate a regulation and control signal set and scheduling; and finally, according to a scheduling result, performing reverse tracing to optimize a fuzzy control strategy, and updating a regulation signal set to obtain a multi-stage regulation instruction to perform intelligent scheduling on the energy of the flow battery. The method solves the technical problems of low matching degree between a scheduling strategy and an actual demand, large power loss and fast battery life attenuation caused by difficulty in accurately capturing an energy state in real time in a traditional flow battery scheduling method, and achieves the purposes of intelligent flow battery energy scheduling, power loss reduction, battery life prolonging and energy conservation. And the matching degree between the scheduling and the actual demand is improved.

The invention provides an intelligent management method and system for photovoltaic energy storage equipment, and the method comprises the steps: analyzing the power fluctuation trend through monitoring the output power and environment parameters of the photovoltaic energy storage equipment in real time, and pre-judging the power fluctuation characteristics; according to the operation state parameters of the supercapacitor and the vanadium redox flow battery and the power fluctuation pre-judgment result, the power distribution proportion and the cooperative working mode of the energy storage element are determined; based on industrial load demand characteristics, an energy storage element is controlled to be flexibly switched between an active adjustment mode and a reactive compensation mode; and voltage regulation and harmonic compensation are realized by monitoring electric energy quality indexes of parallel connection points. According to the invention, the rapid response capability of the photovoltaic energy storage system to the industrial load can be effectively improved, the power supply stability and the electric energy quality are remarkably improved, the system power fluctuation is reduced, the utilization efficiency of the energy storage equipment is improved, and reliable clean energy support is provided for industrial users.

The invention discloses a positive electrode material for a zinc-bromine flow battery and a preparation method and application thereof, and belongs to the technical field of zinc-bromine flow batteries, the preparation method comprises the following steps: crushing and sieving an active carbon source, adding the active carbon source into a graphene oxide aqueous dispersion, stirring, centrifuging, removing supernate, drying, mixing with an activating agent, and activating in an inert atmosphere; washing to be neutral, drying and sieving to obtain a graphene / activated carbon composite material; and attaching the graphene / activated carbon composite material to a carbon-plastic bipolar plate to obtain the positive electrode material for the zinc-bromine flow battery. A graphene / activated carbon composite system is combined with a high-conductivity network, graded holes and surface functional groups, so that the reaction kinetics bottleneck of a traditional carbon material Br2 is broken through.

The invention discloses a method for testing polarization and decoupling of a flow battery. The method aims to quantify and separate three phenomena of ohmic polarization, activation polarization and concentration polarization in the flow battery. Comprising the following steps: firstly, carrying out electrochemical impedance spectroscopy testing under open-circuit voltage and different working currents respectively to obtain ohmic resistance and charge transfer resistance, and carrying out integral calculation to obtain ohmic polarization and activated polarization; then, carrying out a step type constant current charging test to obtain a total polarization curve; and finally, subtracting the ohmic polarization and the activation polarization from the total polarization to obtain concentration polarization. The method is simple and convenient to operate and suitable for various types of flow batteries, a novel and effective solution is provided for polarization analysis of the flow batteries, an accurate test basis can be provided for optimization of battery design, and improvement of performance optimization and research level of the flow batteries is facilitated.

The invention discloses a modified graphite felt electrode for an all-vanadium redox flow battery and a preparation method of the modified graphite felt electrode, and belongs to the technical field of redox flow battery electrode materials. The preparation method comprises the following steps: graphite felt electrochemical oxidation etching treatment; self-assembling a conductive layer on the oxidized and etched graphite felt to obtain the graphite felt attached with the conductive layer; and loading a metal and nitrogen-doped carbon (M and NC) nano catalyst layer on the graphite felt attached with the conductive layer to obtain the modified graphite felt electrode. Various properties of the graphite felt are comprehensively improved through matrix treatment, structure change and load catalysis, mild electrochemical oxidation etching is adopted, a carbon fiber structure is protected, a self-assembled net-shaped conductive layer forms a stable conductive channel, the specific surface area is remarkably increased, a nitrogen-doped carbon shell is adopted to wrap metal nanodots to form an M-NC catalytic layer, and the specific surface area is remarkably increased. The catalyst layer is not easy to dissolve out, the capacity fading rate is obviously improved, the loading capacity of the catalyst layer on the reticular structure conducting layer with a larger specific surface area is larger, and meanwhile, the process is simple and low in cost.

The invention provides a low-cost flow battery and an application thereof, a redox active substance of a positive electrode electrolyte of the low-cost flow battery contains a hydroxylamine cyclic structure group with hindered amine, and the hydroxylamine cyclic structure group with hindered amine is preferably selected from 1-hydroxy-2, 2, 6, 7, 8-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, one or more of a 1-oxo-2, 2, 6, 6-tetrasubstituted piperidine group, a 1-oxo-2, 2, 6, 6-tetrasubstituted piperidine group, a 1-oxo-2, 2, 6, 6-tetrasubstituted piperidine group, and a 1-oxo-2, 2, 6, 6-tetrasubstituted piperidinium group; a redox active substance of the negative electrode electrolyte contains one or more of a titanium element, a vanadium element, a chromium element, an iron element and a zinc element. The low-cost flow battery has the advantages of high output voltage, high energy density, environment friendliness and low cost, and has good application prospects and large-scale popularization potential in the field of energy storage.

The invention discloses preparation and application of a diatomic catalyst modified carbon felt electrode. The preparation method of the modified carbon felt electrode comprises the following steps: dissolving bismuth salt, cobalt salt and urea in water to obtain a complexing solution; immersing the carbon felt substrate subjected to acid activation into a complexing solution for soaking treatment, then taking out the carbon felt substrate, and drying to obtain a precursor-loaded carbon felt; and sequentially carrying out primary heating, cold shock and secondary heating treatment on the precursor-loaded carbon felt, and cooling to obtain the Bi-Co diatom modified carbon felt electrode. The carbon felt electrode can be applied to an all-vanadium redox flow battery. The innovation point of the invention lies in that through the synergistic effect of double atoms and the mutual cooperation of the nitrogen-doped carbon substrate, the intrinsic activity bottleneck of the traditional catalyst is broken through, the comprehensive advantages of high catalytic activity, excellent stability and low cost are achieved, and a new technical solution is provided for the high performance and large-scale application of the flow battery.

The invention discloses a fuel cell coupled flow battery energy supply system and an operation control method thereof. The energy supply system comprises a basic energy supply unit, an energy storage peak regulation unit, a renewable energy power generation unit, an electrolytic hydrogen production unit, a hydrogen storage unit, a first-stage waste heat recycling unit, a second-stage waste heat recycling unit and a heat storage unit. The basic energy supply unit is used for providing a basic power load of the target building group; the energy storage peak regulation unit is used for providing fluctuation power load of the target building group; the first-stage waste heat recycling unit receives first-stage waste heat generated by power generation of the fuel cell and is used for indoor heating or indoor refrigeration. And the second-stage waste heat recycling unit directly receives the first-stage waste heat or second-stage waste heat from the first-stage waste heat recycling unit and is used for preheating the electrolyzed water and / or the hydrogen storage unit. By arranging the first-stage waste heat recycling unit and the second-stage waste heat recycling unit, waste heat is utilized in a multi-stage mode according to requirements, and the waste heat utilization rate is high.

The invention discloses a composite electrode material for a zinc-bromine flow battery and a preparation method and application thereof, and the preparation method comprises the following steps: S1, uniformly stirring a copper salt, a zinc salt, a sodium salt and distilled water at room temperature, aging in air, and then filtering, washing and drying to obtain a zinc-copper composite salt; s2, adding a polymer into an organic solvent under a stirring condition, and stirring under a water bath condition to obtain a spinning solution; then adding zinc-copper composite salt, stirring and then carrying out ultrasonic dispersion to obtain a composite spinning solution; s3, preparing the composite spinning solution into a precursor nanofiber material by utilizing high-voltage electrostatic spinning; and S4, carrying out pre-oxidation and carbonization treatment on the precursor nanofiber material in an atmosphere furnace, and cleaning and drying the carbonized material to obtain the composite electrode material for the zinc-bromine flow battery. According to the invention, the problems of low surface activity of bromine electrode reaction on an electrode material, unstable electro-catalytic performance, bromine permeation and the like in the zinc-bromine flow battery can be solved.

The invention relates to the technical field of flow battery production, in particular to an adsorption tool with a runner electrode plate and a working method. The adsorption tool comprises a suction cup frame, and a suction cup is installed on the suction cup frame; the bottom of the suction cup is provided with a flat-plate-shaped working surface, and the working surface is provided with a plurality of negative pressure adsorption ports for adsorbing the electrode plates; and at least one compensation nozzle is arranged on the working surface and is aligned with a via hole of the electrode plate. The working method comprises the steps that a, the adsorption tool is moved to the position over the to-be-adsorbed electrode plate; b, the negative-pressure adsorption port keeps a negative-pressure adsorption state, and the bottom working face of the suction cup makes contact with the to-be-sucked electrode plate; c, the adsorption tool moves to a release station, d, the negative pressure adsorption opening removes the negative pressure, the adsorbed electrode plate is released, and meanwhile the compensation spray head is started. Through the arrangement, under the condition that a servo system and the release height of the electrode plate are not changed, pressure is compensated below the electrode plate, the falling speed of the electrode plate is slowed down, and the electrode plate is protected.

The invention discloses a flow battery system and a temperature control method thereof. A positive electrode heater and a positive electrode cooler which are used as a positive electrode temperature control assembly are arranged in a positive electrode electrolyte conveying and temperature management unit, and a negative electrode heater and a negative electrode cooler which are used as a negative electrode temperature control assembly are arranged in a negative electrode electrolyte conveying and temperature management unit. Closed-loop or open-loop management is carried out on the positive electrode temperature control assembly and the positive electrode in-pile or out-pile temperature or the temperature adjusting rate of the positive electrode in-pile or out-pile temperature, and closed-loop or open-loop management is carried out on the negative electrode temperature control assembly and the negative electrode in-pile or out-pile temperature or the temperature adjusting rate of the negative electrode in-pile or out-pile temperature, so that the temperature and the temperature change rate can be effectively controlled. Through the implementation of the invention, the system temperature management can be finer, the adaptability of the system under different conditions is improved, the battery performance and the system efficiency can be improved, the operation mode can be adjusted according to requirements in the operation process, and the application is more flexible; the system operation reliability can be enhanced, the system life is prolonged, and the system efficiency is improved.

The invention relates to the technical field of all-vanadium redox flow batteries, in particular to a sulfonated polybenzimidazole proton exchange membrane as well as a preparation method and application thereof. The proton exchange membrane structurally comprises a polybenzimidazole polymer main chain and a sulfonic acid group, the free volume of the polybenzimidazole polymer is regulated and controlled by synthesizing raw materials with different structures, and the polybenzimidazole proton exchange membrane is obtained by sulfonating the polybenzimidazole polymer. Aiming at the problems of cross permeation of vanadium ion electrolyte of a positive electrode and a negative electrode of the all-vanadium redox flow battery, capacity attenuation of the all-vanadium redox flow battery and low energy conversion efficiency, the preparation method comprises the following steps: constructing a polybenzimidazole polymer main chain by selecting raw materials with high rigidity and high free volume; the mechanical property of the polybenzimidazole membrane is improved while a rapid ion channel is constructed in the polymer membrane, and water molecules can be contained to limit swelling of a membrane material.

The invention relates to a flow battery charge state detection device and method, and is applied to the technical field of flow batteries. Compared with the prior art, the reference detection cavity connected with the bipolar plate is formed, the reference electrolyte can be replaced and supplemented without arranging a reference electrolyte storage tank, the adaptability of the detection device is improved, and the reference detection cavity corresponds to the positive electrolyte detection cavity and / or the negative electrolyte detection cavity, so that the detection efficiency is improved. A reference electrode is arranged in a reference detection cavity, the potential deviation of a reference electrolyte can be detected and calibrated in real time, and a calibration voltage value of the reference detection cavity is obtained, so that the potential of a positive electrode electrolyte relative to the reference electrode, the potential of a negative electrode electrolyte relative to the reference electrode and the calibration voltage value are used for calibrating the potential deviation of the reference electrolyte. The concentration of each valence ion is calculated on line through a multi-parameter empirical formula, and the charge state of the flow battery is obtained in real time through the concentration of each valence ion, so that the detection error is reduced, the detection sensitivity is improved, and the real-time monitoring precision of the charge state is improved.

The invention relates to a bismuth-containing modified electrolyte, an all-vanadium redox flow battery and a preparation method and application of the all-vanadium redox flow battery, and belongs to the technical field of all-vanadium redox flow batteries. The bismuth-containing modified electrolyte comprises a vanadium electrolyte, bismuth salt is added into the vanadium electrolyte to serve as a catalyst, and a hydroxyl carboxylic acid complexing agent is added; the molar ratio of the bismuth salt to the hydroxycarboxylic acid complexing agent is (6-8): (0.6-0.8). According to the invention, the catalyst and the complexing agent are added into the electrolyte, the Bi elementary substance is deposited on the electrode through the charging process of the battery, the active sites of the electrode are increased, and the energy efficiency of the battery is improved. Meanwhile, the catalyst can improve the capacity retention ratio of the flow battery, greatly simplify the process steps and reduce the cost.

The invention discloses a flow battery state-of-charge estimation method based on a TCN-BiLSTM neural network and EIS data, and belongs to the technical field of flow battery management. According to the method, temperature, flow velocity, frequency, real part impedance and imaginary part impedance are extracted as input characteristics by measuring EIS data of the flow battery under different SOCs, and a hybrid model fusing a time convolutional network (TCN) and a bidirectional long-short-term memory network (BiLSTM) is constructed. The TCN captures a local time sequence dependency relationship through multi-layer expansion convolution and residual connection, the BiLSTM learns global sequence features by using a bidirectional gating mechanism, and finally, the global sequence features are mapped into SOC values through a full connection layer. According to the model, Min-Max normalization preprocessing data is adopted, a mean square error is used as a loss function and is combined with an Adam optimizer for training, and the estimation precision is evaluated through MAE, RMSE and R2 indexes. According to the method, the TCN-BiLSTM neural network model is trained based on the EIS data, the defects of a traditional SOC estimation method under the dynamic operation condition can be overcome, and the method has the advantages of being high in precision, high in robustness and wide in applicability.

The invention relates to the technical field of new energy storage, and discloses a liquid leakage detection and collection method for a galvanic pile of a flow battery energy storage system, which comprises the following steps of: arranging a humidity sensor, a gas sensor, a temperature sensor, a visual sensor and a pressure sensor in a key area of the galvanic pile to form a high-density detection network of multi-source data; sensor data are collected and transmitted to a control center in real time, multi-source data are fused through Kalman filtering, Bayesian estimation and a deep learning model, and feature information of liquid leakage is obtained; and based on feature information of multi-source data fusion, a multi-point interpolation method and three-dimensional space modeling are used to realize positioning of a liquid leakage area. The intelligent grading response and control technical scheme is adopted, and factors such as leakage diffusion and environmental conditions are dynamically analyzed, so that grading self-adaptive response of operations such as isolation, cooling, load shedding and shutdown is realized, and compared with the scheme that only single isolation or shutdown is adopted to cope with a leakage event in the prior art.

The invention belongs to the field of flow energy storage battery materials, and particularly relates to a multi-dimensional conductive material, a preparation method thereof and application of the multi-dimensional conductive material in an all-vanadium flow battery. Graphite and multi-walled carbon nanotubes are bonded together by adopting a biomass precursor, a carbon base of biomass is converted into graphitized carbon nanotubes through step-by-step pyrolysis, amorphous carbon in the graphite and the original carbon nanotubes is further graphitized, and finally the multi-dimensional conductive material with the carbon nanotubes inserted on a graphite matrix is formed. The multidimensional characteristic of the surface of the multidimensional conductive material is beneficial to formation of a longitudinal conductive path of the bipolar plate and reduction of vertical body resistance of the bipolar plate, and is also beneficial to wetting of epoxy resin among conductive particles and mechanical interlocking of molecular chains of the epoxy resin, so that the mechanical strength of the bipolar plate is improved, the use performance of the bipolar plate is effectively enhanced, and the service life of the bipolar plate is prolonged. The requirement of long-time operation of the flow battery is met, the material cost of the flow battery is relatively reduced, the industrialization of the bipolar plate is powerfully promoted, and the application value is very good.

The present invention relates to novel lignin-derived compounds and compositions comprising the same and their use as redox flow battery electrolytes. The invention further provides a method for preparing said compounds and compositions as well as a redox flow battery comprising said compounds and compositions. Additionally, an assembly for carrying out the inventive method is provided.

The utility model discloses an active flow equalizing device of a flow battery system, which relates to the field of flow batteries and comprises a flow battery module and a flow battery capacity unit, the active flow equalizing device of the flow battery system adopts a standardized design, and one flow battery module is provided with two adjustable distributed circulating pumps. Data are collected through temperature, pressure and flow sensors, a battery management system performs analysis according to a big data algorithm, and independent control of each flow battery module is realized on each module, so that the flow of each electric pile in the module is uniform and controllable; when it is monitored that the galvanic piles in the modules run abnormally and are not controlled, the battery management system can close the control valves of the galvanic piles in time and give an early warning, subsequent fault detection is facilitated, and meanwhile normal running of the other galvanic piles is not affected. According to the utility model, stable output of the circulating pump is realized, and the pile charging and discharging efficiency is greatly improved.

The invention provides a zinc-nickel air flow battery energy storage cabinet. The zinc-nickel-air flow battery energy storage cabinet comprises a control module and a plurality of flow battery energy storage modules, each flow battery energy storage module comprises a plurality of supporting layers, an electrolyte storage tank is fixed to a first supporting layer in the supporting layers in a limited mode, a galvanic pile is fixed to a second supporting layer above the first supporting layer in a limited mode, and the control module is connected with the control module. The third supporting layer above the second supporting layer is used for installing an electric pile sensor module, a liquid delivery pump is arranged below the first supporting layer, and the electric pile, the liquid delivery pump and the electrolyte storage tank are connected through a liquid circulation pipeline; the control module comprises an air compressor; the air compressor is connected with the electric pile through an air pipeline; the control module further comprises an electric energy management system, and the electric energy management system comprises an energy management system, a power conversion system and a battery management module. According to the embodiment provided by the invention, the integration of the zinc-nickel air flow battery is realized.

The invention provides a flow battery composite electrode, a preparation method thereof and a flow battery. The preparation method comprises the following steps: placing a pretreated carbonaceous substrate in a mixed solution of a surfactant, an electrolyte and a transition metal salt, growing a metal oxide nanosheet array on the surface of the pretreated carbonaceous substrate by using an electrochemical deposition process, washing, drying and roasting to obtain the flow battery composite electrode, wherein the feeding ratio of the surfactant to the transition metal salt is (1-2) g: (0.02-0.2) mol. The invention also provides the flow battery composite electrode prepared by the preparation method and a flow battery prepared from the electrode. According to the preparation method, the electrochemical reaction activity of the electrode in the all-vanadium redox flow battery can be optimized by regulating and controlling the chemical composition and the microstructure of the catalyst loaded on the surface of the carbon fiber.

The invention relates to the technical field of batteries, in particular to an all-vanadium redox flow battery performance prediction method based on parameter compensation. The method comprises the following steps: firstly, according to structure parameters of an all-vanadium redox flow battery in an energy storage power station, constructing a multi-physical field coupling simulation model comprising electrochemical reaction, ion transmission, fluid dynamics and thermal management; operating the model according to the operating parameters within a preset operating time period, and obtaining galvanic pile performance index data; carrying out sensitivity analysis on the structural parameters by adopting an orthogonal test method, and obtaining a regression coefficient through multiple linear regression; sorting the regression coefficients, selecting a target regression coefficient, establishing a parameter mapping relation according to a performance index fluctuation value, and performing compensation when the fluctuation value change exceeds a threshold value; and finally, determining a weight factor based on an analytic hierarchy process and an entropy weight method, and screening key structure parameters. According to the method, the limitations of fixed parameters and single environment in a traditional method are overcome, and accurate prediction of the performance of the all-vanadium redox flow battery in different operating environments is realized.

The invention discloses a polybenzimidazole modified ion exchange membrane as well as preparation and application thereof. The polybenzimidazole modified ion exchange membrane comprises a polybenzimidazole-containing porous base membrane, the surface of the porous base membrane is grafted with a sulfonic acid modified layer, and the outer surface of the sulfonic acid modified layer is coated with an aluminum fluoride layer. The preparation method of the membrane comprises the following steps: immersing a polybenzimidazole-based membrane into an ammonium acetate aqueous solution for reaction, taking out the base membrane after the reaction, and drying to obtain a pretreated base membrane; immersing the pretreated base membrane into a sulfonic acid group grafting solution, heating for reaction, cleaning the base membrane after the reaction, and drying to obtain a sulfonic acid modified base membrane; and immersing the sulfonic acid modified base membrane into an ethanol solution of aluminum fluoride for reaction, taking out the membrane after the reaction, cleaning and drying to obtain the membrane. The membrane can be used for assembling a flow battery. According to the invention, the problem that a sulfonic acid modified layer is incompatible with metal fluoride is overcome, and a proper combination of a sulfonating agent and metal fluoride is screened, so that the high-performance ion exchange membrane which can be used for a flow battery is successfully obtained.

This invention discloses an iron-chromium redox flow battery system and a capacity recovery method including a rebalancing device, belonging to the field of flow battery technology. It includes an iron-chromium redox flow battery module, a rebalancing device, and an electrolyte readjustment module. The rebalancing device is used to electrolyze and reduce the ferric ions in the positive electrode electrolyte of the iron-chromium redox flow battery module to ferrous ions. The electrolyte readjustment module is used to correct the concentration of the reduced positive electrode electrolyte in the rebalancing device. The rebalancing device of this invention uses water electrolysis to reduce the Fe in the positive electrode electrolyte of the iron-chromium redox flow battery. 3+ Reduced to Fe 2+ This avoids the emission of electrolysis byproducts and cross-contamination of impurity ions across the membrane, making the entire rebalancing process clean and simple to operate. The electrolyte readjustment module optimizes the concentration and volume of the electrolyte after activity recovery, making it closer to the initial electrolyte composition and avoiding the problem of deteriorated flow battery performance caused by differences in electrolyte volume and concentration after capacity recovery.

The invention relates to the technical field of battery testing, and provides a flow battery bipolar plate flow channel diversion performance testing device, which comprises an intelligent testing galvanic pile, which is composed of a plurality of detachable flow channel units, each flow channel unit comprises a bipolar plate and two flow channel frames, the flow channel frames adopt a modular design, and the flow channel units are connected with the intelligent testing galvanic pile; a plurality of micro pressure sensors, temperature sensors and flow sensors are embedded in the shell; the intelligent liquid path system comprises a plurality of independent liquid path circulating units, and each unit is composed of a liquid tank, an intelligent liquid pump, a liquid supply pipeline and a liquid return pipeline; a plurality of independent test chambers are arranged in the multifunctional shell, and a temperature and humidity control system and an intelligent drainage system are arranged in the shell; and the data acquisition and analysis system consists of a high-performance computer, a data acquisition card, a signal amplifier and analysis software. The problems that in the prior art, the local flow characteristic of the electrolyte on the surface of the carbon felt is difficult to accurately evaluate, and the requirement of optimizing flow channel design on refined data cannot be met are solved.

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 relates to the field of preparation of flow battery electrode materials, and discloses a nano bismuth particle loaded graphite felt electrode and a preparation method thereof. The method comprises the following steps: pretreating a graphite felt electrode to obtain a hydrophilic graphite felt electrode; immersing the hydrophilic graphite felt electrode into a solution containing bismuth ions, taking out and drying to obtain a graphite felt loaded with reduced bismuth precursor crystals; and treating the graphite felt loaded with the reduced bismuth precursor crystal by adopting plasma to obtain the graphite felt electrode loaded with the nano bismuth particles. The bismuth ions adsorbed on the surfaces of the graphite felt fibers are directly reduced into nano-scale bismuth metal particles through a plasma reduction technology. The method can avoid high temperature and complex technological process in a traditional method, realizes a simple and efficient preparation process, and is suitable for large-scale electrode modification.

The invention relates to the technical field of redox flow batteries, in particular to an all-vanadium redox flow battery electrolyte based on bromo-hydrochloric acid and application of the all-vanadium redox flow battery electrolyte. The electrolyte comprises vanadium ions, hydrogen ions, bromide ions and chloride ions, wherein the molar concentration ratio of the chloride ions to the bromide ions is greater than or equal to 2; and the volume ratio of the positive electrode electrolyte to the negative electrode electrolyte is (0.5-0.95): 1. According to the electrolyte disclosed by the invention, on the basis of fully utilizing the capacity provided by vanadium, the capacity provided by bromine is effectively utilized through participation of bromine ions in an electrochemical reaction, so that the capacity of the all-vanadium redox flow battery is improved, and meanwhile, the energy cost is reduced; the electrolyte can improve the high-temperature stability of the all-vanadium redox flow battery.

To provide an electrolyte for a redox flow battery that can reduce deposition of a metal forming an organometallic complex.SOLUTION: There is provided the electrolyte for a redox flow battery, including: an organometallic complex; and an auxiliary complexing agent including at least one type selected from the group consisting of a polycarboxylic acid, a polyol, and an aminocarboxylic acid.SELECTED DRAWING: Figure 1