550 results about "Overpotential" patented technology

The invention discloses a composite three-dimensional current collector prepared based on chemical plating, a metal negative electrode and a metal secondary battery, and belongs to the technical field of metal secondary batteries. The composite three-dimensional current collector comprises a nonmetal three-dimensional skeleton matrix and a metal coating which is uniformly distributed on the surface of the matrix through chemical plating. When the metal battery works, Mg, Li, Na, Ca, Zn and other metals are induced to be subjected to uniform electro-deposition and stripping on the surface of the composite three-dimensional current collector by virtue of affinity among metals, and the three-dimensional porous structure of the matrix provides a buffer space for metal deposition, so that metal ions are subjected to rapid and uniform electro-deposition; the stability of an electrode interface can be enhanced, dendritic crystal growth is reduced, the electrodeposition overpotential of metal is reduced, and the service life of a metal negative electrode is prolonged. The composite three-dimensional current collector prepared on the basis of chemical plating solves the problem of non-uniform growth of a metal negative electrode, and is an effective way for commercialized production of a metal secondary battery.

The invention relates to a non-noble metal-based self-supporting electrode, a preparation method thereof and application of the non-noble metal-based self-supporting electrode in efficient electrolyzed water. The self-supporting electrode comprises a non-noble metal substrate layer, and a transition layer and a catalytic activity layer which are sequentially arranged on the surface of the non-noble metal substrate layer, the transition layer comprises NiFe unit cell nano particles; the catalytic activity layer comprises CoFeLDH, and the CoFeLDH is of a cactus spherical structure formed by a nano needle-shaped array; and a heterojunction interface is arranged between the transition layer containing the NiFe unit cell nanoparticles and the catalytic activity layer containing the CoFeLDH. The catalyst has low oxygen evolution overpotential and has high current density and excellent stability under the working condition, the transition layer is constructed between the catalytic active layer and the foamed nickel substrate, interface contact between the catalytic active layer and the substrate can be optimized, more uniform stress distribution and better interface adhesion can be achieved, charge transfer and mass transfer are enhanced, and the catalytic activity of the catalyst is improved. Therefore, the electrode interface stability is realized.

The invention provides a three-loop control lithium ion battery flexible fast charging method and system, and the method comprises the steps: obtaining the current charging current and voltage of a lithium ion battery, calculating the overpotential through an electrochemical-thermal-aging coupling model, carrying out the constant overpotential lossless charging, and obtaining a preliminary control current; performing constant strain charging according to the initial control current in combination with the obtained internal strain of the lithium ion battery, and limiting the charging current in the stage by taking the expansion strain when the residual electric quantity is set as a strain boundary in the charging process; performing constant-temperature charging according to the charging current in combination with the obtained temperature of the lithium ion battery, and adjusting the charging current rate within a set temperature range; constant overpotential lossless charging control is used as an outer ring, constant strain charging is used as a middle ring, constant temperature charging is used as an inner ring, a final control current is determined through three-ring control, and flexible fast charging is achieved. According to the invention, a plurality of parameters of the battery can be monitored and controlled, and the contradiction between charging safety and rapidity is solved.

The invention provides a method for regulating and controlling cooling time after Joule heating and a high-entropy oxide electrocatalyst based on the method, and belongs to the technical field of electrocatalytic electrolysis of water. According to the method, the relationship between the graphite substrates with different mass area ratios and the cooling time is determined based on the Newton's law of cooling by carrying out volume segmentation on the graphite substrates; the structure and performance of the high-entropy oxide electrocatalyst are regulated and controlled on the basis of a cooling time regulation and control strategy; the prepared high-entropy oxide electrocatalyst has excellent oxygen evolution reaction catalytic activity in an alkaline environment, the structure of the high-entropy oxide electrocatalyst with the cooling time of 0.3 s is a nanowire assembled by fine nano-particles, the high-entropy oxide electrocatalyst shows the optimal electrochemical performance, and under the current density of 10 mA cm <-2 >, the high-entropy oxide electrocatalyst has excellent oxygen evolution reaction catalytic activity. And the overpotential is only 219 mV. The method provided by the invention is simple and efficient, and can be widely applied to preparation and performance optimization of the electrocatalyst.

The invention relates to the technical field of electrocatalytic materials, in particular to a deep self-reconstruction high-entropy sulfide electrocatalyst and a preparation method and application thereof. When the potential reaches 1.8 V vs.RHE, the current density of the deep self-reconfigurable high-entropy sulfide electrocatalyst is close to 600 mA cm <-2 >, low overpotential and high current density are shown, the overall efficiency of hydrogen production through water electrolysis is remarkably improved, and powerful support is provided for utilization of renewable energy sources and large-scale preparation of hydrogen energy.

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

The invention discloses a lithium-oxygen battery electrolyte and a preparation method and application thereof. The lithium-oxygen battery electrolyte comprises a lithium salt, an additive and a solvent, the additive is 1, 3-dimethylimidazole iodized salt. The redox medium (organic iodized salt) is added into the ether electrolyte of the lithium oxygen battery, anions of the redox medium can reduce the charge-discharge overpotential of the lithium oxygen battery, cations of the redox medium can form an in-situ protection layer on a lithium negative electrode, the redox medium is prevented from reacting with the lithium negative electrode, lithium corrosion and lithium dendrite growth are effectively inhibited, and the service life of the lithium oxygen battery is prolonged. And the lithium-oxygen battery has excellent electrochemical performance and long cycle stability.

The invention relates to the technical field of batteries, in particular to an all-vanadium redox flow battery SOC dual monitoring correction method and system. The method comprises the following steps: acquiring first SOC data through potential monitoring, wherein the first SOC data comprises a positive charge-discharge state SOC positive, n and a negative charge-discharge state SOC negative, n; second SOC data including SOC positive ', n and SOC negative', n are obtained through electrolyte valence state concentration monitoring; calculating correction coefficients kappa positive and kappa negative according to the first SOC data and the second SOC data; and finally, correcting the third SOC data by using the correction coefficient to obtain an actual SOC value. According to the method, a dual monitoring mode is adopted, the real-time online characteristic of potential monitoring is utilized, the high-precision advantage of electrolyte concentration monitoring is combined, the two monitoring methods are organically combined through a correction coefficient, and the problems that single potential monitoring is affected by hydrogen ion concentration and the electrolyte concentration monitoring cannot realize real-time online monitoring are solved. According to the method, the correction frequency of 0-10 days is designed, the correction timeliness and sampling interference are reasonably balanced, and the accuracy of SOC monitoring is improved.

The invention discloses a negative electrode current collector, a battery monomer, a battery and a power utilization device, the negative electrode current collector comprises a substrate and an alloy layer located on at least one side of the substrate, the alloy layer comprises a first metal element and a second metal element, and the substrate comprises a third metal element, the nucleation overpotential of the elementary substance of the second metal element is smaller than the nucleation overpotential of the elementary substance of the first metal element, the nucleation overpotential of the lithium metal of the elementary substance of the first metal element is larger than or equal to 0.10 V, and the nucleation overpotential of the elementary substance of the second metal element is smaller than the nucleation overpotential of the elementary substance of the third metal element. According to the invention, the battery has high coulombic efficiency, high reliability and long cycle life.

An electrocatalyst, a method of producing hydrogen gas by a hydrogen evolution reaction, and a method of producing oxygen gas by an oxygen evolution reaction. The electrocatalyst includes manganese oxide nanoparticles, and silver containing nanoparticles disposed on the manganese oxide nanoparticles, the silver-containing nanoparticles include a shell of silver tungstate disposed on a core of Ag. The electrocatalyst has an electrical resistivity of 0.50×107 ohm (Ω) to 6.0×107Ω, a charge transfer resistance of 325Ω to 450Ω, a Tafel slope of 55 mV / dec to 125 mV / dec, and an overpotential at 10 mA / cm2 of 0.05 mV to 200 mV.

The present application belongs to the technical field of batteries, and specifically relates to an electrolyte, a secondary battery, and an electrical apparatus. The electrolyte provided in the present application comprises a sodium salt and a lithium salt, a deposition overpotential of lithium metal in the electrolyte is higher than that a sodium metal deposition overpotential, and the electrolyte has film-forming selectivity, improving cycle performance of the secondary battery. The secondary battery provided in the present application comprises said electrolyte, and also comprises a positive electrode plate, an active material in the positive electrode plate comprising a sodium ion positive electrode active material and a lithium ion positive electrode active material. The charging platform voltage of the sodium ion positive electrode active material in the battery is lower than the charging platform voltage of the lithium ion positive electrode active material in the battery. The electrolyte in the secondary battery is compatible with the positive electrode plate, and the storage performance of the secondary battery is further improved.

The invention belongs to the field of electrode materials, and particularly relates to an alkaline hydrogen production electrode and a preparation method thereof.The alkaline hydrogen production electrode comprises an electrode substrate and a catalyst loaded on the electrode substrate; the catalyst comprises the following components: Ni, Fe, Mo, Cr and Mn, the molar percentage of Mo is 5-15%, and the total molar percentage of Fe and Mo is 35%. By alloying, introducing Mo and controlling the content of Fe and Mo, the catalytic activity is enhanced, compared with existing binary Raney nickel, the catalytic activity is higher, the HER reaction overpotential can be effectively reduced, so that the energy consumption of an electrolytic bath is reduced, and the corrosion resistance of an electrode can be enhanced through Cr and Mn.

The invention discloses a charging optimization method for inhibiting lithium electroplating based on a mechanism model, and belongs to the technical field of battery charging. According to the method, firstly, a lithium ion battery electrochemical model P2D model is constructed and linearized to serve as a state space of the model prediction control method so as to obtain response of lithium electroplating overpotential to charging current, and the response is one of main factors for promoting battery aging. And then, designing a multi-objective optimization task for rapid charging and limiting the lithium electroplating potential, and improving the charging current to the greatest extent while inhibiting the lithium electroplating reaction in the lithium battery, so that a rapid charging scheme for inhibiting the lithium electroplating reaction of the battery is realized. Besides, by constructing an LSTM model and utilizing current and voltage data of the battery to identify the aging condition of the battery, an experimental result shows that the charging strategy can improve the charging speed under the condition of keeping the lithium plating potential of the battery within a certain range, and can effectively adjust the aged batteries of different degrees, so that the universality of the charging strategy is remarkably improved.

The invention relates to the technical field of sodium ion batteries, and discloses a low-overpotential uniform sodium deposition composite electrolyte and a preparation method of a sodium metal battery, the composite electrolyte comprises a sodium salt, a solvent, a film-forming additive and a sodium deposition regulating agent; the film forming additive is selected from at least one of NaPO2F2, NaDFOB and Na2SO3; the sodium deposition regulating agent is selected from at least one of CsTFSI, SnCl2 and Bi (OTf) 3. Through the synergistic effect of the film-forming additive and the sodium deposition regulating agent, a stable and firm SEI film can be formed on the interface of the negative electrode current collector, the overpotential of sodium deposition is obviously reduced to 20 mV or below, the growth of sodium dendrites is effectively inhibited, and dense and uniform deposition of sodium is realized. The negative-electrode-free sodium metal battery based on the composite electrolyte shows high first efficiency (greater than or equal to 90%), high coulombic efficiency (greater than 99.5%) and excellent cycling stability, and an effective scheme is provided for solving the core challenge of a sodium metal negative electrode.

The invention discloses an electrode and a preparation method thereof and a solid-state battery, the electrode comprises a current collector and a carbon nanotube layer covering the current collector, and catalysts are distributed at the bottom and the top of the carbon nanotube; when the electrode in the technical scheme is applied to the battery, as the catalyst is arranged at the bottom and the top of the carbon nano tube, lithium metal can be synergistically induced to be uniformly deposited on the surface and the bottom of the carbon nano tube electrode, and when lithium ions are uniformly distributed on the surface and inside of the electrode (inside and among the carbon nano tube), the condition that the local lithium ion concentration is too high does not occur; the generation of local overpotential can be avoided through uniform deposition, so that lithium precipitation is prevented; meanwhile, by designing and controlling the deposition amount of lithium not to exceed the maximum in-tube and inter-tube deposition capacity of the carbon nanotubes, the whole electrode is free of expansion and shrinkage in the charging and discharging process, and lithium metal expansion is effectively limited.

The invention discloses a composite cathode and anode plate made of a lead-carbon composite material, the composite cathode and anode plate comprises a current collector, a transition layer and an active layer which are compounded in sequence, the transition layer tightly coats the outer surface of the current collector, the active layer tightly coats the outer surface of the transition layer, and the composite cathode and anode plate is prepared by the following method: S1, preparing the composite cathode and anode plate; raw material pretreatment: placing the carbon material in a vacuum oven; according to the invention, the structural design of the composite negative plate and the preparation process are integrated, so that accurate matching of the raw material ratio and the process parameters is realized, and many defects of the traditional electrode are effectively solved; the three-layer gradient structure improves the interface bonding force, and delamination is avoided; the optimized raw material system and the preparation process have a synergistic effect, so that the hydrogen evolution overpotential is remarkably improved, the internal resistance is reduced, the cycle life is prolonged, the low-temperature performance is improved, the energy density is improved, and a reliable technical scheme is provided for the application of the lead-acid storage battery in the high-end field.

The invention relates to the technical field of fuel cell membrane electrode voltage distribution testing, in particular to a fuel cell membrane electrode voltage distribution testing method and system, and the method comprises the steps: arranging a potential sensor array, and synchronously collecting an original voltage vector through the potential sensor array in the loading operation process of a fuel cell; a reference electrode is arranged in the non-reaction area, a stable reference signal is applied to the reference electrode, and a feedback signal of the reference electrode is collected after preset stable time is delayed; carrying out difference calculation on the feedback signal and the stable reference signal to obtain a system measurement drift distance; and performing joint calibration on the original voltage vector according to the system measurement drift amount and the spatial continuity constraint of the membrane electrode voltage distribution to obtain the voltage distribution vector of the fuel cell membrane electrode. And the authenticity and reliability of the voltage distribution data in the long-period test process of the fuel cell are ensured by continuously compensating the drift of the measurement precision.

A method for determining a condition indicating imminent thermal runaway in a power source includes changing a state of charge of the power source during one of a plurality of charge cycles and a plurality of discharge cycle. In response to the state of charge in each of the one of the plurality of charge cycles and the plurality of discharge cycles, the method includes matching a first condition measuring the state of charge of the power source and determining an overpotential value based on the measured state of charge. The method also includes determining a trend based on a plurality of the overpotential values and identifying an indication of possible thermal runaway in the power source based on the trend indicating a downward trend of the plurality of overpotential values.

The invention discloses a palladium-doped Ir-Sn oxide titanium anode with high catalytic activity and a preparation method of the palladium-doped Ir-Sn oxide titanium anode, and belongs to the technical field of electrolytic anodes. The anode comprises a titanium substrate, a TiO2-Ta2O5 intermediate layer and an Ir-Sn-Pd oxide catalyst layer, the molar ratio of Ir to Sn to Pd in the catalyst layer is (5-6): 3: (1-2), and the total metal ion concentration is 0.3 mol L. The preparation method is realized through titanium substrate pretreatment (sand blasting and etching), intermediate layer coating sintering (a TiCl4-TaCl5 solution) and catalyst layer circulating coating sintering (an H2IrCl6-SnCl4-PdCl2 mixed solution). The relatively cheap palladium element is introduced, the electron structure of the catalyst layer is optimized by utilizing the defect effect, the charge transfer resistance is reduced to 6.7 omegacm, and meanwhile, the iridium consumption is reduced by more than 30%. Experiments show that the cell voltage of the anode is stabilized at 0.95 V (the current density is 5Acm <-2 >), the accelerated life reaches 1630 hours, the coating binding force is 62N, and the corrosion rate in an acidic electrolyte is only 0.01 mm / year. Compared with a traditional iridium tantalum anode, the cost is reduced by 40%, and the overpotential in the oxygen evolution reaction is as low as 0.45 V.

The invention discloses a low-temperature sodium metal battery electrolyte and a preparation method and application thereof, and belongs to the technical field of energy storage batteries. The low-temperature sodium metal battery electrolyte provided by the invention is prepared by dissolving sodium salt in ethylene glycol diethyl ether (EGDEE) and cyclopentyl methyl ether (CPME). The ethyl chain at the tail end of EGDEE in the electrolyte prepared by the invention allows more anions to enter the first solvation sheath of the hybrid solvent, so that the ionic conductivity at the ultralow temperature of-40 DEG C is greatly improved. Meanwhile, a novel anion-rich solvation structure can be spontaneously formed at low temperature, and the kinematic mechanics rate of Na < + > is increased. Meanwhile, two organic solvents with non-cyclic ether structures are adopted, so that the problem of easy ring opening in the prior art is solved, ultralow sodium nucleation overpotential is shown, and uniform sodium deposition can be realized, so that the composite material has excellent reversibility and cycling stability at room temperature and low temperature, has excellent electrochemical performance, and is suitable for industrial production. And the prepared sodium metal battery has a wide application prospect.

The present application provides a negative electrode plate, an electrochemical device and an electronic device of a sodium ion battery, wherein the negative electrode plate includes a negative electrode current collector, a carbon material coating formed on at least a portion of the surface of the negative electrode current collector, and a sodium metal layer formed on at least a portion of the surface of the carbon material coating away from the negative electrode current collector, the thickness of the carbon material coating is less than or equal to 10 μm, the carbon material coating includes a carbon material and a polymer binder, the carbon material includes an oxygen-containing group, and the mass content of oxygen atoms in the carbon material is ≥ 0.1%. The negative electrode plate of the sodium ion battery provided by the present application deposits metallic sodium on the surface of the negative electrode current collector during the first charge, and the metallic sodium formed by the deposition can adhere to the carbon material coating on the surface of the negative electrode current collector, and the carbon material coating can effectively reduce the overpotential of sodium metal deposition, inhibit the formation of sodium dendrites, and is conducive to improving the cycle performance of the battery.

The invention provides a preparation method of a negative electrode current collector with a sodium-philic composite coating, the negative electrode current collector and a negative-electrode-free all-solid-state battery, and relates to the technical field of sodium ion battery cells, and the preparation method comprises the following steps: S1, depositing a layer of MAX phase film on the surface of the negative electrode current collector; and step S2, removing the aluminum layer in the MAX phase film so as to form a sodium-philic composite coating coated with multiple layers of MXene on the surface of the negative electrode current collector. The preparation method has the beneficial effects that the sodium-philic composite coating coated with multiple layers of MXene can be formed on the surface of the negative electrode current collector through two-step operation, so that the MXene layer with ionic conduction and the metal layer with electronic conduction are mixed together, the effect of mixed conduction of ions and electrons is realized, and further by virtue of the two-dimensional structure and the sodium-philic characteristic of the MXene material, the performance of the negative electrode is improved. The deposition overpotential of sodium electricity can be reduced, and sodium ions are induced to be uniformly deposited on the surface of the current collector; in addition, high mechanical strength and good conductivity of MXene can effectively inhibit volume expansion of the electrode, so that the cycle life of the battery is prolonged, and the safety of the battery is improved.

The present application provides an electrode assembly, a battery cell, a secondary battery, and an electric device. The electrode assembly comprises a positive electrode sheet, a negative electrode current collector and a separator located between the positive electrode sheet and the negative electrode current collector; the electrode assembly further comprises a modification layer, the modification layer is located between the negative electrode current collector and the separator, and the modification layer comprises a base material and an active material dispersed in the base material; the lithium metal nucleation overpotential of the base material is greater than or equal to 80 mV, and the lithium metal nucleation overpotential of the active material is less than that of the base material. The modification layer in the electrode assembly of the present application can reduce volume expansion during the deposition of metals such as lithium and sodium on the negative electrode current collector, so that the risk of piercing the separator caused by volume expansion is reduced, thereby improving the reliability and the cycle performance of batteries.

The invention provides a gradient composite graphene electrolysis electrode plate and an in-situ preparation method thereof. The electrode plate comprises a metal conductive base material (such as titanium alloy), a porous ceramic skeleton layer (Al2O3-40% ZrO2, the porosity of which is 30 + / -5%), a chemical copper plating layer for filling pores, an electroplated nickel-ruthenium alloy catalytic layer (Ni: Ru = 9: 1) and 3-5 graphene functional layers (ID / IG is less than or equal to 0.08) grown in situ, wherein the porous ceramic skeleton layer (Al2O3-40% ZrO2) is laser-cladded on the surface of the porous ceramic skeleton layer (Al2O3-40% ZrO2). The preparation method comprises the following steps: performing laser cladding on a ceramic skeleton, wherein the power density is 300-500W / mm < 2 >, and sintering at 1600 DEG C to form metallurgical bonding; gradient plating: electroless copper plating (containing nano-diamond enhancement) and pulse electroplating of Ni Ru (duty ratio is 1: 5); and performing directional CVD growth: after reducing the catalyst layer by H2 at 1050 DEG C, introducing CH4 / H2 (the volume ratio is 1: 4) in a pulse manner, and realizing full coverage of the inner wall of the mesh by vortex air intake. The technical effects are as follows: (1) the overpotential of chlorine evolution in saturated salt water at 80 DEG C is as low as 268mV (1A / cm < 2 >); (2) strong acid environment service life gt; the time is 100 thousand hours (12 times that of the national standard); (3) the production cost is lt; and 620 / m < 2 > (90% lower than that of a traditional ruthenium-iridium coating). The problems of graphene transfer damage and special-shaped electrode covering are solved.

The invention relates to a high-entropy alloy composite material with excellent performance under normal-temperature and normal-pressure conditions and application of the high-entropy alloy composite material to electrolyzed water. According to the method, an electrochemical workstation is used for carrying out constant-voltage electrodeposition, the high-entropy alloy material NiFeCoZnCuMnCr is loaded on the surface of the treated carbon paper, the influence of multiple influence factors on the performance and morphology of the high-entropy alloy composite material is explored, and the optimal preparation condition of the high-entropy alloy composite material is found. The high-entropy alloy composite material with a core-shell structure of which the shell is made of multi-metal hydroxide (NiFeCoZnCuMnCr) LDH and the core is made of high-entropy alloy NiFeCoZnCuMnCr HEAs is optimally synthesized by regulating and controlling the total concentration of a precursor solution to be 0.21 mol L <-1 > and the proportion of metal salts to be Ni: Fe: Co: Zn: Cu: Mn: Cr to be 1: 5: 15: 3: 1: 1: 1, the overpotentials required by the high-entropy alloy composite material OER and HER to reach the current density of 100 mA cm <-2 > are 378 mV and 331 mV respectively, and the high-entropy alloy composite material has excellent electro-catalytic performance.

A method and system for optimizing the charging process of lithium-ion batteries by utilizing a determined parameter (e.g., Lyapunov Exponent) as a cell degradation (e.g., anode overpotential) indicator are disclosed. The system and method enable intelligent charging, which may involve integrating a controller that adjusts the charging current in real-time (or near real time or otherwise) based on the cell degradation indicator, calculated from probing the battery. This approach has various possible benefits to which the method and system may be tuned including extending battery lifespan, charge timing, and safety.

The invention relates to a method for improving the reaction efficiency of alkaline electrolyzed water, a buffering agent is added into an alkaline electrolyzed water reaction system to maintain the local pH stability of the surface of an electrode so as to reduce the overpotential, the buffering agent forms a buffering system, and the buffering system is composed of one or more chemical substances of K3PO4, K2HPO4, Na2SiO3 and organic amine buffering agents. Compared with the prior art, the method has the advantages that the buffer agent is added into the alkaline electrolyzed water reaction system to maintain the stability of the local pH of the surface of the electrode, so that the overpotential is reduced, and the electrolysis efficiency is improved. The buffer system disclosed by the invention is composed of a plurality of chemical substances, and can be independently used or used in proportion in a combined manner so as to adapt to different alkaline electrolysis conditions and electrolysis process requirements.

The invention discloses a preparation method and application of a lattice-gap mixed RuO2 solid solution acidic oxygen evolution electrocatalyst. According to the RuO2 electrocatalyst and the preparation method thereof, high-valence metal is introduced into RuO2 unit cells at the same time to serve as a lattice substitution doping component, nonmetal serves as an interstitial doping component, and a lattice-interstitial mixed RuO2 solid solution structure is constructed, so that the activity and stability of the RuO2 electrocatalyst are remarkably improved. The preparation method comprises the following steps: dissolving soluble ruthenium salt, high-valence metal salt, non-metal salt and a molten salt medium in deionized water, and stirring to form a solution; the solution is freeze-dried to prepare a precursor, and then the precursor is subjected to heat treatment to obtain the lattice-gap mixed RuO2 solid solution acidic oxygen evolution electrocatalyst. According to the lattice-gap mixed RuO2 solid solution acidic oxygen evolution electrocatalyst prepared by the invention, the overpotential required by a catalytic oxygen evolution reaction under the current density of 10mA cm <-2 > can be as low as 168mV, and the electrocatalyst can continuously and stably work for more than 500h in an acidic environment, so that the application requirements of the acidic oxygen evolution electrocatalyst can be greatly met.

The invention discloses a current collector active material and a preparation method and application thereof, and relates to the technical field of electrochemical energy storage. Comprising the following steps: dissolving acid, a niobium precursor and aniline in water to form a solution A; dissolving ammonium persulfate in water to form a solution B, adding the solution B into the solution A, uniformly mixing, standing for reaction, carrying out suction filtration and drying to obtain niobium-doped polyaniline carbon nanotubes, and carrying out heat treatment on the niobium-doped polyaniline carbon nanotubes in a protective atmosphere to obtain amorphous carbon nanotubes embedded with niobium pentoxide nanoparticles. The method can be used for preparing a negative-electrode-free sodium metal battery current collector and a negative-electrode-free sodium metal battery. According to the method, hectogram or even kilogram-level superfine amorphous carbon nanotubes embedded with niobium pentoxide nanoparticles can be prepared in a single batch in a macroscopic manner, and Nb2O5 nanoparticles anchored in the carbon tubes are subjected to reversible intercalation pseudocapacitance reaction, so that the sodium ion migration rate is remarkably increased, sodium ions are preferentially adsorbed, the nucleation overpotential is greatly reduced, and the performance of the carbon nanotubes is improved. And the assembled negative-electrode-free sodium metal total battery shows an extremely high capacity retention ratio.

The invention provides a battery internal uniformity analysis method and system, electronic equipment and a storage medium, and relates to the technical field of lithium ion batteries, the method comprises: constructing a three-dimensional multi-physics field coupling model of a target battery, the three-dimensional multi-physics field coupling model comprising a three-dimensional geometric sub-model, an electrochemical reaction sub-model and a thermal field sub-model; a plurality of tab design schemes are set, tab parameters of the tab design schemes are different, and the tab parameters at least comprise the number of tabs, the width of the tabs and the positions of the tabs; simulation analysis is conducted according to the three-dimensional multi-physics field coupling model and the tab design scheme, a uniformity analysis result is obtained, and simulation analysis at least comprises discharge curve analysis, direct current internal resistance test analysis, current distribution and current density analysis, current collector ohmic loss analysis, active material overpotential analysis and battery temperature distribution analysis. The method is based on all-parameter uniformity simulation analysis, and spatial distribution of key parameters in the battery can be quantified.