374 results about "Porous electrode" patented technology

The invention provides a preparation system and method of porous electrode carbon. The system mainly comprises a two-section temperature-variable carbonization fluidized bed and an activation fluidized bed. According to the method, small-particle-size polymer particles are softened in the carbonization process and bonded with a large number of heat carrier particles to form composite particles, so that self bonding and excessive growth are avoided, and controllable carbonization is achieved in the two-section temperature-changing carbonization fluidized bed; and introducing the composite particles into an activation fluidized bed, carrying out high-temperature activation, and removing the heat carrier to obtain the porous carbon electrode carbon particles. According to the method, adhesion of polymer particles during carbonization is avoided, the problem of instability of superfine particle fluidization operation is solved, the links of grinding and heating and cooling are reduced, and the method has the advantages of being low in cost and capable of being continuously operated.

The invention provides a double-sided patterning method for a hemispherical resonance plate electrode and a plate electrode, and the method comprises the steps: clamping the side surface of an electrode body by adopting an annular clamp with grids, placing the electrode body in a film plating machine, and plating metal films on the front and back surfaces of the electrode body, meanwhile, the side face of the electrode body is plated with a grid metal strip film by adjusting the magnetron sputtering angle and the grid-shaped clamp; the metal films on the front and back surfaces of the electrode body are communicated through the grid metal strip films on the side surfaces; spraying glue on the surface of the coated electrode; the electrode is placed on a suction cup of a photoetching machine, the T-shaped mark on the suction cup is aligned with the grid metal strip on the side face of the electrode, and first alignment is completed; pushing the suction cup into the photoetching machine, and aligning the T-shaped mark on the mask with the T-shaped mark on the suction cup to complete secondary alignment; and developing and corroding to finish the double-sided patterning for the hemispherical resonance plate electrode. According to the technical scheme, an original porous electrode scheme needing a pin cap lead can be simplified.

The invention provides an electric pile operation state stress characteristic evaluation method based on finite element analysis. The electric pile operation state stress characteristic evaluation method comprises the following steps: S1, modeling and assembling according to a physical structure of a solid oxide electric pile to form a full-size electric pile model; s2, simulating a co-sintering process of a porous electrode and a thin-layer electrolyte in the full-size galvanic pile model, obtaining residual stress and a first stress parameter, and calculating first elastic stress and first inelastic stress; s3, acquiring assembly stress and second stress parameters generated in the assembly process, and calculating second elastic stress and second inelastic stress; s4, heating the solid oxide galvanic pile through a temperature control furnace, obtaining thermal stress and third stress parameters, and calculating third elastic stress and third inelastic stress; and S5, integrating the elastic stress and the non-elastic stress as an electric pile operation state stress characteristic evaluation result. The method has the beneficial effects that the limitation in a complex stress coupling scene can be broken through, and the stress superposition effect at different stages can be quantified.

The utility model provides a battery capable of quantitatively repairing the capacity of a lithium ion battery. The battery capable of quantitatively repairing the capacity of the lithium ion battery comprises a shell, and a battery cell, an energy supplementing system and a battery management system which are arranged in the shell, the energy complementing system is connected with the battery management system through a wire harness; the battery cell comprises a cathode, a third electrode and an anode; the third electrode is used for supplementing lithium for the cathode and the anode; the third electrode is a porous electrode or a mesh electrode; the number of the negative electrodes and the positive electrodes is greater than or equal to 1; a layer of third electrode is arranged between each pair of negative electrode and positive electrode; the battery management system is connected with the negative electrode, the third electrode and the positive electrode through wire harnesses. The third electrode serving as a lithium supplementing electrode is arranged between the positive electrode and the negative electrode, the size of the third electrode is equivalent to that of the positive electrode, the third electrode is of a porous structure or a net structure, lithium ion transmission between the positive electrode and the negative electrode is not blocked, and the third electrode can stably exist in the electrolyte when not working (dormancy).

The invention belongs to the field of batteries, and provides a high-current-density long-circulation zinc-bromine flow battery negative electrode electrolyte and battery preparation. The battery comprises a positive electrode, a negative electrode, a diaphragm, positive and negative electrolyte, a current collector and an end plate, the diaphragm is a cation exchange membrane; and the negative electrode electrolyte comprises a metal salt, a supporting electrolyte, an organic carboxylate complexing agent and deionized water. The organic carboxylate complexing agent disclosed by the invention can be adsorbed on a porous electrode, and by increasing zinc deposition sites, inhibiting two-dimensional interface diffusion and promoting zinc mass transfer, zinc dendrites are relieved, and the zinc-bromine flow battery with high current density and long circulation stability is realized.

The invention discloses a distribution characteristic evaluation method and device for a microstructure of a battery electrode and electronic equipment. The method comprises the following steps: constructing a microscopic geometric model of the battery electrode; determining a target segmentation number; segmenting the microscopic geometric model into a target segmentation number of partial microscopic geometric models with the same volume; and determining a porous electrode non-uniformity index according to the overall porosity of the micro-geometric model and the local porosity of part of the micro-geometric model. The evaluation method provided by the invention can more accurately evaluate and compare the uniformity of different electrode designs on the microscopic level.

The invention provides a preparation method of a Ru-based alloy type catalyst and application of the Ru-based alloy type catalyst in acidic water electrolysis, and belongs to the technical field of hydrogen production through water electrolysis. According to the Ru-based alloy type acidic water electrolysis catalyst provided by the invention, Ti-based, Mn-based or Co-based oxides are firstly loaded on a porous substrate, then Ru-based metal is further loaded on the basis of loading the oxides, and the Ru-based alloy is prepared by performing electrochemical reduction on the Ru-based metal. According to the catalyst, a porous substrate serves as a growth matrix, Ti-based, Mn-based or Co-based oxide is prepared through a hydrothermal method, then Ru-based alloy is loaded, an efficient and high-stability three-dimensional self-supporting porous electrode is successfully developed, and a new thought is provided for seawater electrolysis hydrogen production.

An air-coupled ultrasonic scanning platform for an air-coupled ultrasonic non-contact metrology of battery electrodes that maps the local variation in density and thickness, and detect defects during electrode casting and drying, includes: piezocomposite air-coupled transducers (Ultran) at 0.5 to 1 MHz that provide sufficient air coupling to enable sound waves to travel through air from a transmitting transducer, through the thin film electrode coated on metal current collector, and then into the receiving transducer. Non-contact, air-coupled ultrasound may be used as a technique for evaluating battery electrode films. An analytical model was derived from fundamental acoustic wave propagation principles to determine acoustic density. Voltage gain or acoustic density maps of electrode films revealed features that are not visually apparent, attributed to mass gradients.

The present invention discloses a flexible integrated pressure and temperature sensor, which includes: a flexible substrate, a sensing material layer, an adhesive layer, and a foam porous electrode layer; the preparation process of the flexible integrated pressure and temperature sensor, the specific steps are as follows: Step 1: Preparation of a flexible substrate, selecting a flexible electrode material with a conductive layer on the surface as a sensor substrate; Step 2: Preparation of a sensing layer, mixing the pre-prepared GDY dispersion and MXene dispersion in an appropriate organic solvent to form a uniform mixed solution; The mixed solution is evenly coated on a PDMS substrate by a spraying method, and then placed in an oven for baking again to ensure that the nanocomposite material is tightly combined with the substrate. The present invention avoids the problems of slow response, poor compatibility, low stability, complex structural design, and high manufacturing process cost of traditional temperature and pressure sensors, and effectively obtains a dual-function sensor with the advantages of sensitive response, high precision and accuracy, and strong stability.

The invention relates to a charging type moisture power generation device based on a double-layer polymer film and a preparation method thereof, and belongs to the technical field of moisture power generation. Comprising an active electrode, double-layer polymer films and an inert porous electrode which are sequentially arranged, the first polymer film of the double-layer polymer films is a mixture of ferric hydroxide, polystyrolsulfon acid and polyvinyl alcohol, the second polymer film of the double-layer polymer films is poly (diallyldimethylammonium chloride), the first polymer film is in contact with the active electrode, and the second polymer film is in contact with the inert porous electrode. The second layer of polymer film is in contact with the inert porous electrode; the active electrode is made of metal with the standard electrode potential ranging from-1 V to + 0.5 V, and the inert porous electrode is made of metal with the standard electrode potential larger than + 1 V. Through moisture evaporation and an oxidation-reduction reaction, the battery can generate electricity by itself in a moisture environment, and can be self-repaired through the oxidation-reduction reaction when the performance is reduced, so that a charging effect is achieved.

The invention belongs to the technical field of flow batteries, and discloses a universal electrode frame suitable for various flow battery stacks and a flow battery stack.The universal electrode frame is composed of a liquid inlet, a liquid outlet, a liquid inlet main flow channel, liquid inlet branch flow channels at all stages, a reaction area, a liquid outlet main flow channel and liquid outlet branch flow channels at all stages; the reaction area is used for placing a reaction electrode and a runner plate, the liquid inlet is communicated with the reaction area through the liquid inlet main runner and each stage of liquid inlet sub-runner, the reaction area is communicated with the liquid outlet through the liquid outlet main runner and each stage of liquid outlet sub-runner, and the runner plates of each stage of liquid inlet sub-runner and each stage of liquid outlet sub-runner are movably connected with the reaction area; and each stage of liquid inlet sub-runner and each stage of liquid outlet sub-runner are formed by combining changes of shapes, positions, sizes and numbers of the supporting strips. Different runner plates and porous electrodes can be matched to form an optimal flow field structure, so that electrolyte distribution is optimized, concentration polarization in a single section and between different sections is reduced, the voltage efficiency is improved, and the energy efficiency is improved.

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 belongs to the technical field of preparation of a porous gas diffusion layer in an electrolytic cell, and particularly relates to a preparation method of an anode gas diffusion layer porous electrode, which is characterized in that a manganese dioxide / Ti electrode with a porous structure is prepared by coating and sintering a coating solution A containing manganese salt on a titanium substrate. The porous manganese dioxide supporting layer serves as micropore extension of the porous transmission layer, the impact effect of water flow and air flow on the proton exchange membrane is weakened, transmission of an oxygen evolution intermediate in the hydrogen production process is facilitated, and the proton exchange membrane is suitable for strong air flow and liquid impact under high current density.

An electrode sheet, and a preparation method therefor and application thereof. The electrode sheet comprises a current collector, and an active substance layer, which is arranged on the surface of the current collector, wherein the active substance layer comprises a carbon conductive network, a conductive agent and an active substance, the conductive agent and the active substance being dispersed in the carbon conductive network, and the carbon conductive network being obtained from a carbonized polymer precursor; and a continuous carbon network is included in the electrode sheet to tightly connect a porous electrode sheet layer to the current collector, and the active substance, conductive carbon black and other particles in the porous electrode sheet layer are uniformly dispersed in the continuous carbon network structure, thereby greatly improving the conductivity of an electrode while ensuring that a physical contact of the electrode sheet is not damaged, and thus enhancing the rate capability and the reaction kinetics of a battery.

The invention belongs to the technical field of solid-state batteries, and provides a sodium ion solid-state electrolyte as well as a preparation method and application thereof. The electrolyte comprises a polymer matrix, sodium salt and a polar organic compound, the polymer matrix includes a first monomer and a second monomer. The preparation method comprises the following steps: mixing sodium salt and a polar organic compound to obtain a eutectic mixture; mixing a first monomer and a second monomer with the eutectic mixture to obtain a precursor solution; and coating a mold with the precursor solution, and curing. The invention also discloses a solid-state sodium ion battery comprising the electrolyte. The sodium ion solid electrolyte disclosed by the invention is high in room-temperature ionic conductivity, excellent in stretchability, high in breaking strength and tensile elongation and incombustibility. And by introducing the composite material into a porous electrode and tightly combining the composite material with active material particles in the electrode, the problem of stress failure of the electrode under low stacking pressure is solved, and good cycling stability of the all-solid-state battery under the low stacking pressure or even under the condition that no external pressure is applied is realized.

The invention provides a method for assisting and strengthening a chemical reaction of a flow battery based on local ultrasound, which comprises the following steps of: (1) arranging ultrasonic transducers on bipolar plates of a positive half battery and a negative half battery of the flow battery, the arrangement position of the ultrasonic transducer on the bipolar plate and the size of the ultrasonic transducer enable the action area of ultrasound applied by the ultrasonic transducer to cover the flow dead zone in the porous electrode; (2) connecting a signal generator with an ultrasonic transducer through a power amplifier; and (3) in the operation process of the flow battery, starting the signal generator and the power amplifier to apply ultrasound to the flow battery through the ultrasonic transducer, and improving the flow velocity and the flow uniformity of the electrolyte in the porous electrode by utilizing the ultrasound so as to strengthen the chemical reaction of the flow battery. According to the method, the flow uniformity of the electrolyte in the porous electrode can be effectively improved, the flexible regulation and control of the flow field in the porous electrode of the flow battery are realized, and the ultrasonic power consumption of the regulation and control of the flow field in the electrode is reduced.

The invention belongs to the technical field of lithium extraction, and particularly relates to an electric de-intercalation and extraction lithium pole plate and a preparation method and application thereof.The electric de-intercalation and extraction lithium pole plate comprises a modified current collector which comprises a porous current collector base material and a conductive bottom coating, and the conductive bottom coating is arranged on the surface of the porous current collector base material; and the porous electrode slurry layer is arranged on the surface of the modified current collector.

The invention provides a three-dimensional reconstruction method for a porous Ni-YSZ electrode of a solid oxide battery. The three-dimensional reconstruction method comprises the following steps: S1, vacuum cold embedding; s2, argon ion polishing; s3, sample pretreatment and fixation; s4, FIB continuous slicing and In-lens and SE2 dual-channel image acquisition are carried out; and S5, carrying out deep learning analysis. The three-dimensional reconstruction method for the porous Ni-YSZ electrode of the solid oxide battery has the beneficial effects that accurate analysis of a multi-phase material structure is realized by integrating in-situ characterization and intelligent image analysis technologies, and the method has the advantages of high sample preparation stability, good three-dimensional reconstruction precision, high phase identification automation degree and the like. The method is especially suitable for microstructure evolution research of an electrode / electrolyte interface of a solid oxide fuel cell, and has an important value for revealing a material performance attenuation mechanism under high-temperature complex working conditions.

The invention discloses a composite woven porous electrode and an electrolytic bath, an electrolysis device and a method applying the composite woven porous electrode, the composite woven porous electrode comprises conductive hydrophilic silk threads and alkali-resistant hydrophobic silk threads, and the conductive hydrophilic silk threads and the alkali-resistant hydrophobic silk threads are twisted into twisted woven silk threads. The weaving silk threads are woven in an omega shape to form a multi-scale gap network structure, and weaving wave crests and weaving wave troughs are formed. The multi-scale gap network structure adopts a two-dimensional net-shaped stacking structure, and the stacking mode is that weaving wave crests and weaving wave troughs in different stacking layers correspond to each other, so that a macroscopic flow channel is formed; according to the composite woven porous electrode disclosed by the invention, micro-bubbles in electrolyte are reduced, the separation difficulty caused by small diameters of the micro-bubbles is solved, the problem of incomplete separation of a subsequent traditional gas-liquid separator is solved, the gas content in the electrolyte is reduced, the efficiency of hydrogen production by alkaline water electrolysis is improved, and the hydrogen production cost is reduced. And efficient and safe operation of the whole hydrogen production system is ensured.

Compared with a porous IrO2 electrode prepared by a traditional polymer binder, the oxygen evolution electrode prepared by the method provided by the invention has the following two advantages: (1) the polymer binder is canceled, and the hydrophilicity and activity of the surface of the electrode are improved; and (2) the binding force between the catalyst and the porous substrate is remarkably enhanced by IrO2 particles generated by heat treatment, so that the service life of the electrode is prolonged, and the cycling stability of the electrode is improved.

The present invention relates to a porous electrode for use in electrical energy storage or production devices, such as a lithium ion battery. Said porous electrode is a porous layer comprising at least an active electrode material P and an electronic conductive oxide material.

The invention discloses a suspension electrolytic leaching method for a positive electrode material of a retired lithium ion battery. The method comprises the following steps: step 1, discharging, disassembling, pyrolyzing, crushing, sorting and sieving the waste lithium ion battery to obtain positive electrode material black powder; 2, mixing the black powder with a mediating agent according to an active substance proportion control method to obtain mixed black powder A; step 3, adding an acid and a surfactant into deionized water to obtain an electrolyte A; 4, mixing and stirring the electrolyte A and the mixed black powder A, and carrying out suspension electrolysis in an electrolytic tank containing a porous electrode under certain conditions; and fifthly, after suspension electrolysis is completed, the electrode is taken out, electrolyte is filtered, and leachate is obtained. Compared with the prior art, the method is wide in raw material applicability, large in treatment capacity, low in electrolysis energy consumption, free of gassing side reaction and high in production safety, and meanwhile efficient leaching is achieved.

The invention relates to a subassembly for an all-solid-state battery, an all-solid-state battery, and a method of making an all-solid-state battery. The negative electrode subassembly includes a negative electrode current collector, an intermediate layer, and a solid electrolyte layer arranged in the stated order, in which in its initial state or fully discharged state, the intermediate layer includes: a first intermediate layer including a porous carbon material; a porous electrode contacting the solid electrolyte layer and including a porous carbon material having pores partially or completely filled with lithium; a second intermediate layer containing a porous carbon material on the first intermediate layer and having lithium-free pores; and a metal-containing third intermediate layer in contact with the negative electrode current collector and on the porous carbon material-containing second intermediate layer, in which the metal-containing third intermediate layer includes a metal.

According to the membrane-free electrochemical energy storage device, in the thickness direction of a partition plate, a first energy storage device and a second energy storage device are arranged on the two sides of the partition plate correspondingly and connected with the partition plate; the first energy storage device comprises a first end plate, a first sealing gasket, a first current collector, a first gas diffusion electrode, a first porous membrane, a first auxiliary electrode, a second porous membrane, a first porous electrode, a second current collector and a second sealing gasket; the second energy storage device comprises a second end plate, a third sealing gasket, a third current collector, a second gas diffusion electrode, a third porous membrane, a second auxiliary electrode, a fourth porous membrane, a second porous electrode, a fourth current collector and a fourth sealing gasket; the metal strip is connected between the first auxiliary electrode and the second auxiliary electrode. Therefore, the membrane-free electrochemical energy storage device provided by the invention can perform short-term energy storage and can also perform long-term energy storage, and the energy storage effect and the energy storage cost can be both considered.

The invention discloses an N + ion modified alpha-PbO porous electrode, a preparation method thereof and an application of electro-catalytic synthesis of sodium borohydride, and the preparation process of the porous electrode is as follows: firstly ball-milling beta-PbO powder, then stirring by using an N-containing cationic surfactant solution, forming N + modification on the alpha-PbO surface, mixing with sodium metaborate, conductive powder and paraffin, grinding, tabletting, and finally obtaining the N + ion modified alpha-PbO porous electrode. And embedding in aluminum oxide and sintering, thereby finishing the preparation. N + modification is formed on the surface of alpha-PbO, so that the double-electric-layer structure on the surface of a catalytic electrode can be improved, and mass transfer of a reactant B (OH) 4-on a cathode is promoted; meanwhile, Pb-N-O bonds are easily formed on the surface of the modified catalyst, the adsorption effect on-OH is enhanced, and activation of reactants on the surface of the catalyst is facilitated. The N + ion modified alpha-PbO porous electrode is used for solid-phase electrolytic synthesis of sodium borohydride and has efficient performance, and the current efficiency of electroreduction synthesis of sodium borohydride in an alkaline sodium metaborate solution can reach 67.6% or above.

A thermoelectrochemical converter is provided. The converter includes a working fluid, first and second coupled membrane electrode assemblies (MEAs), first and second heat transfer members, a heat sink, and a heat source. Each MEA includes a first porous electrode operating at a first pressure, a second porous electrode operating at a second pressure higher than the first pressure, and an ionically conductive membrane sandwiched therebetween. The first MEA compresses the working fluid and the second MEA expands the working fluid. The first heat transfer member is coupled to and in thermal engagement with the low pressure electrode of the first MEA. The second heat transfer member is coupled to and in thermal interface with the low pressure electrode of the second MEA. The heat sink is coupled to the low pressure side of the first MEA and the heat source is coupled to the low pressure side of the second MEA.

This invention belongs to the field of metal powder preparation technology, and discloses a porous nickel powder, its preparation method, and its applications. The method includes: preparing nickel oxalate powder as a precursor; forming a nickel coating layer on the surface of the nickel oxalate powder by chemical plating to obtain nickel oxalate@nickel core-shell structured composite particles; subjecting the composite particles to pyrolysis annealing treatment, causing the internal nickel oxalate to decompose and generate gas, and the external nickel coating layer to transform into a porous metal framework, thereby obtaining porous nickel powder. This method is simple, low-cost, and produces nickel powder particles with uniform size, stable pore structure, good connectivity, and large specific surface area, making it suitable as a precursor for electrocatalytic active materials or porous electrode materials.

The application discloses a multi-scale hierarchical porous electrode and a preparation method and application thereof, and relates to the technical field of electrode preparation. The multi-scale hierarchical porous electrode comprises a substrate and a carbon network modification layer modified in the substrate; the carbon network modification layer is formed by carbonization of amphiphilic polymers, the amphiphilic polymer molecular chains contain hydrophilic groups and hydrophobic groups at the same time, can be dissolved in water and oil respectively, and can play a stabilizing role at the liquid-liquid interface; the phase separation of the polymers between fibers is driven by solvent controlled evaporation, and solidification is achieved; and finally, the electrode is obtained by high-temperature carbonization. The application improves the active sites without destroying the macro-pores of the carbon cloth, adopts a liquid-liquid phase separation method to construct a multi-scale carbon network on the fiber surface in situ, spontaneously induces a surface tension during a solvent drying process, forms a modification structure with different pores on the surface of the carbon fiber and between the fibers, improves the electrochemical performance of the electrode, and can improve the energy and power density of the battery.

The invention discloses a biochar-based three-dimensional porous electrode material, an electrode preparation method and an electrode application. The method comprises the following steps: pre-treating straw biomass by fully immersing the material in an NH3·H2O solution after crushing the material, preparing straw native biochar by anaerobic pyrolysis, and respectively alkali impregnating, high-temperature activating, acid washing and water washing the product to obtain the biochar-based three-dimensional porous electrode material; mixing the biochar-based electrode material, carboxymethyl chitosan and a solvent in proportion, heating and stirring the mixture to a viscous state, and obtaining a cross-linked layer 1 of the biochar-based porous three-dimensional electrode; mixing the biochar-based electrode material, an acrylic resin emulsion and a solvent in proportion, heating and stirring the mixture to a viscous state, and obtaining a cross-linked layer 2 of the biochar-based porous three-dimensional electrode; rolling the cross-linked layer 1 and the cross-linked layer 2 onto the upper and lower surfaces of a metal mesh respectively and drying the mixture to obtain the biochar-based porous three-dimensional electrode. When the electrode is applied to high-organic-load anaerobic digestion, the electrode can significantly stabilize the pH value of the anaerobic digestion liquid caused by the high-load impact.

The present invention discloses an on-line detection method for the porosity of the electrodes of a dissolution-deposition type flow battery. The specific steps include: measuring the fiber diameter of the porous electrode, then assembling the flow battery and injecting the discharged-state electrolyte; recording the pressure of the electrode to be measured under the rated flow rate; calculating the electrode permeability according to the measured pressure, flow rate, as well as the geometric dimensions of the electrode and the viscosity of the electrolyte; calculating the electrode porosity according to the electrode permeability and in combination with the fiber diameter of the electrode; successively charging the battery to different state of charge and measuring the electrode permeability at each state; fitting a pressure-permeability equation according to the measured electrode permeability and pressure data; inputting the fitting equation into the battery management system to directly read the electrode permeability under the operating state, or reading the pressure and then calculating the real-time electrode permeability by using the fitting equation. This method has a convenient process, does not require complex equipment, has a low cost, and realizes the on-line measurement of the porosity of the electrodes of the dissolution-deposition type flow battery.