51 results about "Polarization impedance" patented technology

The invention discloses a battery pack equalization control method and system based on multidimensional state mapping, and the method comprises the steps: obtaining terminal voltage data, working current data and surface temperature data of each single battery in a target battery pack; calculating an ohm internal resistance value and a polarization impedance value of each single battery; calculating an impedance growth rate; according to the impedance growth rate and the surface temperature data, a health state value is determined, and an aging weighting coefficient is determined; determining a polarization safety coefficient of each single battery based on the polarization impedance value; calculating a state-of-charge value of each single battery in the target battery pack, and determining a balance demand deviation degree; determining a basic equalization duty ratio of each single battery according to the equalization demand deviation degree; correcting the basic balance duty ratio to generate a target pulse width modulation duty ratio; and according to the target pulse width modulation duty ratio, controlling equalization circuits connected to the two ends of each single battery to be switched on. The battery pack equalization control efficiency is improved.

The invention provides a composite positive electrode material and a preparation method and application thereof, the composite positive electrode material comprises a matrix and a carbon coating layer on the surface of the matrix, and the matrix comprises a porous LMFP material; the porous LMFP material comprises doped metal elements, and holes of the porous LMFP material comprise a lithium supplement agent. Doping elements in the composite positive electrode material can improve the stability of a crystal structure and reduce high-temperature storage and cyclic gas production, and the lithium supplement agent in the porous LMFP material can prolong the cycle life of the material and can be decomposed to form pores again after first-time charging, so that an electrolyte can enter the interior of material particles, and the service life of the material is prolonged. And the carbon coating layer can improve the conductivity of the material and reduce the polarization impedance of the material, and meanwhile, the processing problems that residual alkali on the surface of the lithium supplementing agent reacts with a glue solution, so that slurry is gelled and the like can be avoided.

The embodiment of the invention discloses a battery charging and discharging power estimation method, electronic equipment and a readable storage medium. The method comprises the following steps: determining an impedance parameter of an equivalent circuit model of a battery according to at least one of the temperature, the state of charge and the rate of the battery; wherein the impedance parameters comprise at least one of ohmic impedance, electrochemical polarization impedance, electrochemical capacitance, concentration polarization impedance and concentration capacitance; according to the impedance parameter, the open-circuit voltage of the battery and the current of the battery, the charging power or the discharging power of the battery is estimated, the charging and discharging power of the battery is estimated under the condition of the dynamic voltage of the battery, and the accuracy of the charging and discharging power estimation of the battery is improved.

The invention discloses a load control method and system for mobile energy storage equipment, a medium and a product, and the method comprises the steps: obtaining the motion state data and environment state data of target mobile energy storage equipment; performing second-order differential operation on the real-time speed to obtain a jerk value; generating a power demand impact sequence; based on the real-time polarization impedance and the real-time open-circuit voltage, calculating a maximum pulse discharge power threshold value under the condition that a preset under-voltage protection threshold value is not triggered; when the maximum power demand value in the power demand impact sequence is greater than the maximum pulse discharge power threshold, determining that the target mobile energy storage equipment has a power supply drop risk in a preset load prediction time window; calculating an energy gap prediction sequence based on waveform integration of the power demand impact sequence; and generating a feed-forward compensation instruction based on the energy gap prediction sequence, and controlling an auxiliary power conversion unit in the target mobile energy storage equipment to execute the feed-forward compensation instruction. And the accuracy of load control is improved.

The invention relates to the technical field of lithium batteries, and provides a lithium battery consistency sorting method and device, a storage medium and computer equipment, during battery sorting, test data of a lithium battery in a sudden charging pulse test process is collected and used for determining open-circuit voltage and ohmic internal resistance, and an equivalent circuit model is established; the polarization characteristic of the lithium battery is accurately reflected; determining time domain response data of the polarization impedance under the relaxation time scale according to the open-circuit voltage, the ohmic internal resistance and an equivalent circuit model, and further solving to obtain a distribution density function of the polarization resistance, thereby enhancing the explanation capability of batteries in different aging states; performing difference value fitting to obtain a fitting curve of the distribution density function, extracting an AC internal resistance characteristic value from the fitting curve, and reducing data redundancy; and finally, a clustering algorithm is adopted to carry out consistency sorting on a characteristic quantity set obtained by combining the parameters, so that the batteries with similar characteristic quantities are gathered together according to a sorting result, the performance difference is reduced, and the sorting precision is improved.

According to the valve-regulated lead-acid storage battery state-of-health assessment method and system provided by the invention, the characteristic frequency points which are not sensitive to the change of the charge state but sensitive to the aging degree in the relaxation time distribution map of the battery are innovatively screened, and the multi-parameter fusion assessment model based on the polarization impedance, the ohmic internal resistance and the residual capacity is established; the defect that a single capacity index cannot reflect a historical aging path of the battery is overcome, the future attenuation trend of the battery can be predicted while the current health state is accurately quantified, the influence of charge state fluctuation on health assessment is effectively avoided based on a dual-stability screening mechanism of a characteristic frequency point, the assessment reliability under a complex working condition is improved, and the assessment accuracy is improved. The full-band impedance test is simplified into specific target frequency point measurement, so that the detection time is greatly shortened, and the on-site rapid evaluation requirement is met.

The invention belongs to the technical field of lithium battery materials, and particularly discloses a porous carbon negative electrode material for a lithium ion battery and a preparation method of the porous carbon negative electrode material. Firstly, a copolymer is prepared through staged polymerization of a functional monomer and a chain transfer agent; secondly, taking nano molybdenum trioxide and zinc acetate dihydrate as raw materials, and performing ball milling and roasting to form a core-shell template; then, mixing and sieving the copolymer, the core-shell template, sodium chloride and the polymethyl methacrylate microspheres to obtain a precursor; and finally, carrying out multi-stage heating carbonization and post-treatment on the precursor to obtain the porous carbon negative electrode material. The obtained negative electrode material has a hierarchical porous structure and a high specific surface area, synergistic doping of multiple elements such as nitrogen, phosphorus and molybdenum is realized, rapid transmission and efficient storage of lithium ions are effectively promoted, the rate capability and cycling stability of a battery are remarkably improved, polarization impedance is reduced, and meanwhile, the electronic conductivity and interface stability of the material are further optimized; excellent comprehensive electrochemical performance is shown in the application of a high-energy-density lithium ion battery.

This invention relates to a medium-temperature solid oxide fuel cell cathode material and its preparation method. The invention employs a sol-gel method to synthesize perovskite oxide Pr 0.1 Ba 0.9 Co 0.8 Zr 0.1 Y 0.1 O 3‑δ The material contains PrBaCo2O with a double perovskite structure. 5+δ BaCo with single perovskite structure 0.8 Zr 0.1 Y 0.1 O 3‑δ Two phases. Multiphase Pr 0.1 Ba 0.9 Co 0.8 Zr 0.1 Y 0.1 O 3‑δ The sample achieved a conductivity of 100 S / cm within the operating temperature range of a mid-temperature solid oxide fuel cell. ‑1 At 700℃, the polarization impedance is 0.06 Ωcm. 2 This meets the requirements for cathode materials in solid oxide fuel cells. The electrolyte-supported single cell achieved a maximum power density of 710 mW / cm³ at 800℃. ‑2 The single cell underwent continuous and stable discharge at a constant current for 200 hours without performance degradation, demonstrating excellent output performance stability. In summary, perovskite oxide Pr 0.1 Ba 0.9 Co 0.8 Zr 0.1 Y 0.1 O 3‑δ It is a potential cathode material for intermediate-temperature solid oxide fuel cells.

The invention discloses an application of a sea urchin-shaped spinel electrode material in a solid oxide fuel cell (SOFC), and the SOFC oxygen electrode material is sea urchin-shaped NiCo2O4 spinel and is prepared by a hydrothermal method. The sea-urchin-shaped spinel is self-assembled to the surface of the YSZ electrolyte through a current polarization induction method, the sea-urchin-shaped spinel electrode can maintain a good nano structure and a high specific surface area without a high-temperature sintering process, an SOFC based on the sea-urchin-shaped spinel oxygen electrode obtains excellent electrochemical performance, and at the working temperature of 700 DEG C, the electrochemical performance of the SOFC is greatly improved. The maximum output power can reach 2.06 W / cm < 2 >, the ohmic impedance is 0.053 ohm cm < 2 >, the polarization impedance is 0.077 ohm cm < 2 >, and excellent long-term stability is shown.

The invention discloses a composite anode material, an anode, an electrolyte-supported solid oxide fuel cell and a preparation method, and relates to the technical field of cells. The composite anode material comprises a double-perovskite anode material and a metal oxide, the double-perovskite anode material comprises YSZ (Yttrium Stabilized Zirconium) and a double-perovskite material, wherein the double-perovskite material is at least one of PrBaMn2O5, PrBa < 0.5 > Sr < 0.5 > Co < 1.5 > Fe < 0.5 > O5, Sr2CoMoO6, LaBaMn2O5, LaBaCo2O5, Sr2FeMoO6, Ba2FeMoO6, Sr2Fe < 1.5 > Mo < 0.5 > O6 and PrBaFe2O5; and the metal oxide is at least one of NiO, Co3O4 and Fe3O4. The preparation method has the beneficial effects that various metal oxides are mixed into the classic double-perovskite anode material, so that the conductivity of the double-perovskite anode can be improved, the polarization impedance of the double-perovskite anode can be reduced, and finally, the relatively large power density improvement of the cell is realized.

This application provides a sheet-like spinel cobalt ferrite, its preparation method, and its application, belonging to the field of solid oxide battery technology. In this application, a Co source and an Fe source are dissolved in deionized water, citric acid is added and stirred until homogeneous, then heated in a water bath until the solution becomes a reddish-brown transparent gel. The gel is then dried and ground to obtain a first powder. The first powder is then subjected to two CO2 laser-induced oxidation processes in air at a laser power of x to obtain a second powder. Wherein, 4W < x ≤ 10W. Finally, the second powder is washed and dried to obtain a sheet-like spinel cobalt ferrite. Compared with ordinary spinel cobalt ferrite, using the aforementioned sheet-like spinel cobalt ferrite as a cathode material in SOFC can reduce the polarization impedance of the battery by 0.023 Ωcm. 2 The maximum power density increased by 0.38 W / cm². ‑2 This improves the oxygen reduction activity and stability of SOFCs. Furthermore, using CO2 laser-induced methods simplifies the preparation process, reduces time costs, and increases production efficiency.

The application relates to the field of power supply circuits and electric energy storage systems, and discloses a full-life-cycle adaptive optimization scheduling method for an energy storage system of a micro-grid cluster, which comprises the following steps: acquiring polarization impedance data of each energy storage branch representing electrode interface charge transfer resistance and an operating state, and decomposing bus net load power into a transient high-frequency sequence and a steady-state low-frequency sequence; distributing high-frequency fluctuation according to the reciprocal of the polarization impedance, adjusting the virtual impedance gain of a power conversion unit control loop to make the output current change rate lower than the physical boundary of ion diffusion rate; and introducing carbon emission intensity weight and loss cost function to correct the power limit value. The application establishes the physical correlation between the battery kinetics and the power fluctuation frequency, smoothes the current waveform by using the virtual impedance adjustment technology, suppresses the concentration polarization and lithium precipitation phenomenon of the electrode interface, and essentially prolongs the service life of the energy storage system.

Methods and systems for controlling and monitoring a vehicle battery pack using a battery impedance model are provided. An electrically powered vehicle (EV) includes a battery pack, one or more sensors, and a vehicle controller. The battery pack includes a plurality of battery cells and is operable to provide at least a portion of propulsion power. The vehicle controller is configured to charge and discharge the battery pack according to a power limit defined by an output of a battery impedance model. The battery impedance model associates a battery impedance value with a frequency-dependent polarized impedance value representative of a diffusion state of the battery cell, and receives a parameter indicative of a measurement of the frequency-dependent polarized impedance value of the battery pack from the one or more sensors.

The invention provides flaky spinel cobalt ferrite as well as a preparation method and application thereof, and belongs to the technical field of solid oxide batteries. The preparation method comprises the following steps: dissolving a Co source and a Fe source in deionized water, adding citric acid, uniformly stirring, heating in a water bath until the solution becomes reddish brown transparent gel, drying, and grinding to obtain first powder; secondly, CO2 laser induction is conducted on the first powder twice in the air atmosphere with the laser power being x, and second powder is obtained; wherein x is more than 4W and less than or equal to 10W. And finally, washing and drying the second powder to obtain the spinel cobalt ferrite with the flaky morphology. Compared with common spinel cobalt ferrite, the flaky spinel cobalt ferrite is applied to the SOFC as a cathode material, so that the polarization impedance of the battery can be reduced by 0.023 ohm cm < 2 >, the maximum power density can be increased by 0.38 W cm <-2 >, and the oxygen reduction activity and stability of the SOFC can be improved. In addition, by adopting the CO2 laser induction method, the preparation process is simplified, the time cost is reduced, and the production efficiency is improved.

The invention provides an SOFC (Solid Oxide Fuel Cell) cathode material as well as a preparation method and application thereof. The chemical formula of the SOFC cathode material is (La < 1-x-y > Sr < x > Y < y >) (Mn < 1-m-n > ComFen) O3, 0 < x < = 0.5, 0 < y < = 0.5, x + y < = 0.5, 0 < m < = 0.5, 0 < n < = 0.5, and m + n < = 0.5. The preparation method comprises the following steps: (1) in the presence of an organic solvent and a complexing agent, mixing lanthanum salt, manganese salt, strontium salt, yttrium salt, cobalt salt and iron salt to obtain sol; (2) calcining the sol; the molar ratio of the lanthanum salt in terms of lanthanum to the strontium salt in terms of strontium to the yttrium salt in terms of yttrium to the manganese salt in terms of manganese to the cobalt salt in terms of cobalt to the iron salt in terms of iron is (1-x-y): x: y: (1-m-n): m: n. The cathode material can reduce the polarization impedance of the battery, improve the oxidation-reduction reaction rate and power density, and further improve the electrochemical performance of the battery.

This invention provides a one-dimensional surface-shared oxide air electrode material, its preparation method, and its application, belonging to the technical field of air electrode materials. The novel one-dimensional surface-shared oxide air electrode material provided by this invention, which is non-stoichiometric, is A5B5O. 14 Type oxide, with the chemical formula Ba 5‑x Co 2.85 Fe 1.9 Ni 0.25 O 14‑δ Where 0 ≤ x ≤ 0.8. This invention modulates the oxygen vacancy concentration by changing the stoichiometric ratio of Ba at the A-site of the oxide, thereby improving its electrochemical performance in proton-conducting ceramic batteries. In Example 3 of this invention, Ba with x = 0.5... 4.5 Co 2.85 Fe 1.9 Ni 0.25 O 14‑δ When applied to proton-conducting ceramic batteries, it exhibits the highest measured electrochemical performance; at 700℃, in fuel cell mode, the measured polarization impedance is only 0.041 Ω·cm. 2 Its maximum power density reaches 2.101 W·cm³. ‑2 In electrolytic cell mode, after introducing humid air to the air electrode side, the current density reached 5.080 A·cm⁻¹ at an electrolytic voltage of 1.3V. ‑2 .

An electrified vehicle (EV) includes a battery pack, one or more sensors, and a vehicle controller. The battery pack includes a plurality of battery cells and is operable to provide at least a portion of motive power. The vehicle controller is configured to charge and discharge the battery pack according to power limits defined by an output of a battery impedance model. The battery impedance model maps battery impedance values ​​to frequency-dependent polarization impedance values ​​representing diffusion states of the battery cells and receives measured parameters from the one or more sensors indicative of the frequency-dependent polarization impedance values ​​of the battery pack.

The present invention proposes a method for characterizing the effect of the spacing between the pole pieces of a lithium-ion battery on the polarization impedance, comprising the following steps: S1, taking a plurality of groups of diaphragms, each group comprising two diaphragms, taking out a diaphragm from each group and attaching different layers of insulating tape on the taken diaphragms, and then assembling each group of diaphragms with the positive pole piece and the negative pole piece into a soft-pack laminated battery; S2, after each battery is formed, adjusting them to a predetermined SOC state for EIS testing; S3, analyzing the impedance spectrum and impedance value of each battery. The present invention increases the spacing between the positive and negative pole pieces of a lithium-ion battery by adhering diaphragms with different layers of insulating tape, simulates the increase in the spacing between the positive and negative pole pieces of a lithium-ion battery caused by factors such as gas production, and combines EIS characterization to analyze the effect of polarization caused by the increase in the spacing between the pole pieces on the battery impedance, which can better analyze the change in the polarization impedance of the battery caused by the increase in the spacing between the positive and negative pole pieces.

The invention discloses a solid electrolyte with a three-period minimum curved surface structure, a solid oxide fuel cell and a preparation method of the solid electrolyte and the solid oxide fuel cell, the solid electrolyte has the three-period minimum curved surface structure, and the three-period minimum curved surface structure is a P-cell structure, an IWP structure or a Neovius structure. According to the solid electrolyte provided by the invention, gas can more conveniently flow into the structure to generate electrochemical reaction, so that the interface contact area of the electrode-electrolyte can be greatly increased, more three-phase boundaries (TPB) can be provided, oxygen reduction (cathode) and fuel oxidation (anode) reactions can be promoted, the electrochemical activity per unit area is improved, and the polarization impedance is reduced.

The invention belongs to the technical field of electrochemical materials, and particularly relates to an anti-Cr poisoning composite current collecting layer for a solid oxide fuel cell as well as a preparation method and application of the anti-Cr poisoning composite current collecting layer. The Cr poisoning resistant composite current collecting layer is a composite current collecting layer constructed by adopting two perovskite materials LCN and LSCN, and the problem of cathode failure caused by volatilization of metal connector Cr is successfully solved by combining the physical barrier characteristic of strontium-free LCN and the chemical capture characteristic of strontium-containing LSCN. The invention aims at an SOFC system using an iron-based alloy as a connector, and aims at solving the technical problem that the catalytic activity of a cathode is attenuated due to chromium species volatilized by a metal connector in a high-temperature oxygen-enriched environment, so that the long-term operation stability of a cell stack is remarkably improved, and the service life of the cell stack is remarkably prolonged. According to the invention, through specific material combination and layered structure design, the contradiction that a single current collecting layer is difficult to give consideration to Cr volatilization blocking and low contact resistance maintaining is solved, and the polarization impedance growth rate of the cell is significantly reduced.

A lithium ion battery polarization anti-energy model and safety state determination method comprises the following steps: obtaining an equivalent circuit model corresponding to a measured electrochemical impedance spectrum through equivalent circuit modeling, embedding the equivalent circuit model into a vehicle-mounted battery management system, and carrying out battery model parameter identification to obtain model parameter values in real time; meanwhile, the electrochemical impedance spectrum of the battery in the actual use process is calculated by utilizing the parameter values, and polarization energy resistance modeling is carried out by taking the area enveloped by the polarization impedance and the coordinate axis of the battery in the actual use process as polarization energy resistance to obtain the polarization energy resistance of the battery at each moment in the use process; and defining the ratio of the polarization energy resistance at each moment to the polarization energy resistance of the battery in a brand new state as a polarization energy resistance state, and judging the safety state of the battery by using the polarization energy resistance state. From the perspective of the reactance of the battery, the invention provides a brand-new battery safety state judgment method, and a new thought is provided for realizing the safety management of the battery.

The present application relates to the technical field of sodium-ion battery health management, in particular to a sodium-ion battery SOC estimation method and system for a DC screen. First, the ohmic impedance and polarization impedance of each battery are obtained, and the reference ohmic impedance and reference polarization impedance are extracted. Further, the capacity loss index is obtained according to the difference between the ohmic impedance of each battery and the reference ohmic impedance, combined with the difference between the polarization impedance and the reference polarization impedance. Further, the historical minimum polarization reference of the battery pack is maintained, and the correction loss value is obtained according to the difference between the current reference polarization impedance and the historical minimum polarization reference, combined with the capacity loss index. Further, the correction loss value is converted into a single battery charge loss amount. Finally, based on the single battery charge loss amount, the system effective SOC of the battery pack is determined according to the series short board effect of the battery pack, and reliable basis is provided for operation and maintenance personnel.

The invention discloses a low-impedance porous support type SOFC (Solid Oxide Fuel Cell) electric pile and a preparation method thereof, and belongs to the technical field of solid oxide fuel cells. The electric pile comprises an anode porous supporting body, an electrode active layer, an electrolyte layer and an interconnection material, and by adopting a porous supporting electrode structure and combining a directional micro-channel design, the ohmic impedance is remarkably reduced by 30%-40%, and the polarization impedance is remarkably reduced by 20%-30%. An electrode and electrolyte interface is optimized by adopting the combination of processes such as an impregnation method, plasma spraying and co-sintering, and the interface resistance is reduced by 25-30% by introducing the gadolinium-doped cerium oxide transition layer, so that the electrochemical performance and long-term operation stability of a galvanic pile are improved. Under the operation condition of 700-800 DEG C, the output power density of the electric pile reaches 1.5 W / cm < 2 >-2.0 W / cm < 2 > which is improved by 30%-50% compared with that of a traditional electric pile, and the thermal cycling stability and the long-term operation stability are also remarkably improved.

The application belongs to the technical field of lithium battery materials, and specifically discloses a kind of porous carbon negative electrode material for lithium ion battery and its preparation method. First, a copolymer is prepared by stage polymerization of functional monomers and chain transfer agent; second, a core-shell template is formed by ball milling and calcination using nano-molybdenum trioxide and zinc acetate dihydrate as raw materials; then, the copolymer, core-shell template, sodium chloride and polymethyl methacrylate microspheres are mixed and sieved to obtain a precursor; finally, the precursor is subjected to multi-stage temperature carbonization and post-processing to obtain a porous carbon negative electrode material. The obtained negative electrode material has a hierarchical porous structure and a high specific surface area, and realizes the synergistic doping of multiple elements such as nitrogen, phosphorus and molybdenum, effectively promoting the rapid transmission and efficient storage of lithium ions, significantly improving the rate performance and cycle stability of the battery, reducing the polarization impedance, and further optimizing the electronic conductivity and interface stability of the material, which exhibits excellent comprehensive electrochemical performance in high-energy-density lithium ion battery applications.

The invention provides a high-entropy perovskite-based composite electrode material, a preparation method of the high-entropy perovskite-based composite electrode material, electrode slurry, an electrode and a solid oxide battery. The chemical formula of the high-entropy perovskite-based composite electrode material is (A < 1-x > Ce < x >) < y > BO < 3-delta >, a is selected from a combination of four or more than five of alkaline earth metal elements and rare earth elements, and A is not Ce; b is selected from one or a combination of more than two of transition metal elements; 0 < x < = 1, 0.5 < = y < 1, and delta is oxygen vacancy content. The high-entropy perovskite-based composite electrode material disclosed by the invention has excellent catalytic activity, shows excellent stability in an air atmosphere and in a severe actual working environment of a battery containing water, Cr and the like, and has relatively low polarization impedance.

This invention relates to the field of intelligent monitoring technology, specifically a monitoring and intervention system based on wearable electromyography (EMG) sensing. The system includes: an impedance compensation acquisition module that applies a variable capacitance bias voltage to acquire discrete EMG parameters; a trajectory vector reconstruction module that generates a coordinate matrix and calculates the cosine of the tangent angle; a spasm identification and judgment module that calculates the output signal when the dispersion exceeds the limit; a residual tension mapping module that generates an attenuation slope based on the over-limit parameters; and a stimulation waveform modulation module that generates an intervention waveform in combination with a safety benchmark. In this invention, high-fidelity discrete signals are acquired by dynamically compensating for the polarization impedance fluctuations of the skin contact surface, mapping the one-dimensional potential of the time sequence to a multi-dimensional phase space and calculating the tangent vector dispersion, accurately capturing the nonlinear abnormal variation characteristics hidden in muscle spasms, dynamically converting the attenuation rate based on the tension difference and setting a safety limit benchmark in combination with the joint range of motion, outputting an intervention waveform adapted to the current tension level, and providing truncation protection when the limit is exceeded.

The invention provides a collaborative test device and method for polarization internal resistance and electrochemical impedance spectroscopy of a storage battery, and relates to the technical field of battery management, and the device comprises a polarization internal resistance test unit, an EIS test unit, a sampling unit and a central processing unit. The polarization internal resistance test unit is used for carrying out polarization internal resistance test control on the storage battery and controlling the sampling unit to carry out sampling; and the EIS test unit is used for carrying out electrochemical impedance spectroscopy test control on the storage battery and controlling the sampling unit to carry out sampling. Polarization internal resistance testing and electrochemical impedance spectroscopy testing of the storage battery are integrated in the same testing device, a collaborative testing framework is constructed, collaborative analysis of the polarization internal resistance and polarization impedance of the storage battery can be obtained through one device, combination of the polarization internal resistance reflecting ohmic polarization and EIS data reflecting electrochemical kinetics is achieved, and the testing accuracy is improved. The state of the storage battery is comprehensively described, the problem of large deviation of single alternating-current impedance evaluation capacity / SOH is solved, and the accuracy and the detection speed of capacity and SOH evaluation results are improved.

The application belongs to the technical field of new materials, and discloses a porous electrode material, an electrode and a preparation method thereof and a solid oxide electrolysis cell. 1.5 Mo 0.5‑x W x O6- δ wherein x represents a molar fraction, and the value range of x is 0 1.5 Mo 0.5 O6 perovskite material, a W-doped Mo is used to replace part of Mo, and a porous electrode material is designed by using the higher valence and electronegativity of W relative to Fe and Mo, and the smaller ionic radius of W relative to Mo. The electrode material not only has high CO2 adsorption, but also has high temperature stability and high catalytic activity. When the electrode material is applied to the oxide solid electrolysis cell, the current density of SOEC electrolysis CO2 is effectively improved, and the polarization resistance of the material is reduced.

The embodiment of the invention provides a polarization impedance determination method and system and a machine readable storage medium, and belongs to the field of energy storage analysis. The determination method comprises the following steps: determining a relaxation time distribution function taking resistance-capacitance impedance and resistance-inductance impedance as variables according to an electrochemical alternating-current impedance spectrum of a target energy storage device under set excitation; further determining a fitting relaxation time distribution characteristic curve of the resistance and inductance impedance; and according to the number of peaks in the fitting relaxation time distribution characteristic curve and the area of a region below a peak curve corresponding to each peak, determining the impedance quantity of each polarization inductance impedance corresponding to each peak. According to the determination method, under the condition that equivalent circuit model pretreatment is not carried out on the energy storage device, polarization characteristic analysis can be carried out on the measured electrochemical alternating-current impedance spectrum, and the data processing workload can be effectively reduced. Meanwhile, the method for determining the polarization impedance can expand the application range of the electrochemical alternating-current impedance spectrum.

The invention provides a one-dimensional surface shared oxide air electrode material and a preparation method and application thereof, and belongs to the technical field of air electrode materials, the non-stoichiometric novel one-dimensional surface shared oxide air electrode material provided by the invention is an A5B5O14 type oxide, the chemical formula of the material is Ba < 5-x > Co < 2.85 > Fe < 1.9 > Ni < 0.25 > O < 14-delta >, and x is greater than or equal to 0 and less than or equal to 0.8. The oxygen vacancy concentration is regulated and controlled by changing the stoichiometric ratio of the Ba element at the A site of the oxide, so that the electrochemical performance of the oxide when the oxide is used for the proton conduction type ceramic battery is improved. When Ba4. 5Co2. 85Fe1. 9Ni0. 25O14-delta with the value of x being 0.5 in an embodiment 3 of the invention is applied to a proton conduction type ceramic battery, the measured electrochemical performance is the highest, the measured polarization impedance is only 0.041 omega.cm < 2 > and the maximum power density reaches 2.101 W.cm <-2 > at 700 DEG C in a fuel battery mode, and the measured polarization impedance is only 0.041 omega.cm < 2 > and the maximum power density reaches 2.101 W.cm <-2 > in an electrolytic tank mode after wet air is introduced into one side of an air electrode under the electrolytic voltage of 1.3 V. And the current density reaches 5.080 A.cm <-2 >.