19 results about "Electrochemical kinetics" patented technology

The invention relates to the technical field of battery management systems, in particular to a battery control method of a BMS (battery management system), which comprises the following steps of: acquiring a voltage sampling value, a temperature sampling value, an internal resistance sampling value and a charge state sampling value of each single battery according to a BMS sampling period, and constructing a single multi-dimensional feature vector; according to the method, the electrochemical dynamic characteristics in the internal polarization elimination process of the battery can be captured by calculating the voltage relaxation rebound slope. And the calculated value is compared with a slope limit dynamic threshold retrieved according to the current temperature and the charge state, so that non-intrusive online quantitative evaluation of the lithium precipitation risk on the surface of the negative electrode is realized. The charging request current is dynamically adjusted or cut-off control is executed according to the lithium precipitation abnormal state judgment index, it is ensured that the battery always works within the nondestructive electrochemical boundary, the fast charging requirement is met, capacity fading and internal short circuit hidden dangers caused by lithium precipitation are avoided, and the safety of the whole life cycle of the battery is improved.

The application discloses a kind of manganese-rich precursors and preparation method and positive electrode material thereof, and is related to lithium ion battery material technical field.The preparation method includes that metal salt solution, precipitant and complexing agent are simultaneously added to reaction kettle by metering pump and carry out coprecipitation reaction, and hydrogen peroxide solution is pumped into reaction system by metering pump in stages during reaction process and carries out liquid phase micro-oxidation treatment.The prepared precursor is spherical secondary particle, and is composed of nanoscale particle and interwoven sheet-shaped primary particle.The method utilizes the direct and uniform oxidation effect of hydrogen peroxide in liquid phase, and in-situ constructs stable high-valence manganese oxide on the surface of precursor, so that the prepared positive electrode material simultaneously has excellent electrochemical kinetics and structural stability.

The invention discloses a proton exchange membrane water electrolysis hydrogen production electrochemical kinetics correction calculation method. The method comprises the following steps: S1, model assumption; s2, constructing an electrochemical model; S2.1, solving two charge balance equations in an electron conduction domain and an electrolyte domain, and completing coupling calculation of potential distribution and electrochemical kinetics; s2.2, introducing the volume fraction and the stoichiometric coefficient of each component into an equilibrium potential equation and a Butler-Volmer equation to complete the correction of the equations, and establishing a corrected PEMWE three-dimensional simulation model; and S3, verifying the accuracy of the corrected PEMWE three-dimensional simulation model and the calculation method. According to the electrochemical kinetics correction calculation method for hydrogen production through water electrolysis of the proton exchange membrane, electrochemical kinetics calculation of the electrolytic tank is corrected, and the problem that the electrochemical reaction rate of the electrolytic tank is affected by the concentration of reactants in actual calculation is solved.

The present inventions relate to methods, systems, apparatuses, controllers, software, and composition of matter associated with electrochemical energy storage devices. The present inventions relate to one or more additives for batteries, e.g., silicon-based batteries. The additives are integrated in the electrode counter-electrode, and / or electrolyte. The additives are configured to enhance electrochemical kinetics, reduce overpotential, suppress parasitic reactions, stabilize passivation layers, suppress dendrite formation, improve capacity retention, enable fast charging, increase coulombic efficiency, enhance reversibility over extended cycling, or any combination thereof.

The invention discloses a bimetal negative electrode liquid metal battery simulation model and simulation method. The method comprises the following steps: S1, constructing a battery geometric model; s2, establishing an ion transfer and current control equation of a molten salt electrolyte domain; s3, establishing electrochemical kinetic equations of a negative electrode-electrolyte interface and a positive electrode-electrolyte interface; s4, establishing a material transfer control equation of the negative electrode domain and the positive electrode domain; s5, establishing and coupling replacement reaction boundary conditions at a negative electrode-electrolyte interface; and S6, according to the equations and boundary conditions established in the steps S2 to S5, allocating corresponding physical field interfaces to each domain of the geometric model established in the step S1, and completing the establishment of the bimetal negative electrode liquid metal battery simulation model. According to the invention, modeling is carried out on the discharge participation process of the two metals in the Na-Li bimetal negative electrode liquid metal battery for the first time, and the specific competition process of the discharge participation of the two metals Na and Li and the physical and chemical change in the battery can be observed through simulation.

The invention relates to the technical field of battery pole pieces, in particular to a pole piece slurry processing method for improving solid content and reducing viscosity. Comprising the following steps: mixing active substance particles with a temporary binder to prepare a pole piece slurry, and enabling the active substance particles to form a temporary aggregate in the pole piece slurry through the temporary binder; the temporary binder can be removed from the pole piece slurry at a temperature not higher than the baking temperature of the pole piece. According to the preparation method, the temporary binder easy to remove is introduced in the material mixing stage to promote the small-particle-size active substance particles to form the temporary aggregate, so that the number of the high-surface-energy small-particle-size particles is effectively reduced, the viscosity of the slurry is reduced, and the solid content can be improved. And in the subsequent pole piece baking stage, the temporary binder can be completely removed, and at the moment, the active substance particles can recover the original primary particle state, so that the excellent electrochemical dynamic performance of the active substance particles is ensured.

The invention relates to a natural graphite and artificial graphite composite derived negative electrode material, preparation and a lithium ion battery, and belongs to the technical field of lithium ion batteries. Natural graphite and artificial graphite are used as main active substances, a proper amount of polyvinylpyrrolidone is added to serve as a polymer binder and a dispersing agent, and the electrode microstructure is optimized by accurately regulating and controlling the dosage of each substance, so that the cycling stability and the rate capability of the graphite negative electrode are improved. The composite strategy can effectively combine the high-capacity characteristic of natural graphite and the structural stability of artificial graphite, and the cycle life of the material is remarkably prolonged while the electrochemical dynamic behavior of the material is improved.

The invention discloses a flow battery electrode material and a preparation method thereof, and belongs to the technical field of flow battery energy storage, a graphite felt electrode is immersed in an MXene dispersion liquid, MXene is loaded on the surface of the graphite felt, and freeze drying is performed to obtain the flow battery electrode material. The MXene material is adopted to modify the graphite felt electrode, adsorption energy and motion energy of metal atoms are regulated and controlled, uniform deposition of Zn / Fe atoms on the electrode material is promoted through high atom motion energy and low adsorption energy of MXene, so that formation of metal dendrites on the electrode material is effectively inhibited, the energy efficiency and the area capacity of the flow battery are remarkably improved, and the flow battery has good application prospects. The electrochemical kinetics is optimized, and the activation energy is reduced by more than 50%. The preparation method provided by the invention has high efficiency and expandability, inhibits the generation of hydrogen evolution side reaction, prolongs the service life of the flow battery, and provides a solution for high-safety and low-cost large-scale energy storage.

The invention relates to the technical field of battery management systems, discloses an all-vanadium redox flow battery state-of-charge prediction method based on hierarchical physical prior strengthening, and aims to realize accurate prediction of the battery state-of-charge. The method comprises the following steps: collecting an endogenous time sequence and an exogenous time sequence of all-vanadium redox flow battery operation; respectively performing embedding processing on the endogenous time sequence and the exogenous time sequence to obtain an endogenous feature marker and an exogenous feature marker; wherein the endogenous time sequence is a charge state sequence, and the exogenous time sequence comprises current, terminal voltage, open-circuit voltage and temperature. And sequentially carrying out local time sequence feature extraction, physical memory state tracking, electrochemical dynamic state correction, endogenous and endogenous feature fusion and thermodynamic constraint enhancement processing on the endogenous feature mark and the exogenous feature mark, and outputting a feature vector after physical consistency enhancement. And performing constraint adjustment on the feature vector after physical consistency enhancement based on the law of conservation of charge, and outputting a final state of charge prediction result.

The invention provides a cross-scale battery cell leakage characteristic identification method based on deep learning, and the method comprises the steps: collecting the multi-source operation parameters of a battery cell in real time, such as an electrochemical parameter and a physical field parameter; the electrochemical parameters of the discrete time sequence and the physical field parameters of the continuous space are mapped to a unified feature space through a space-time alignment frame; constructing a hybrid neural network architecture to extract cross-scale features, wherein the architecture comprises a deep bidirectional LSTM network and a graph convolutional network; training a hybrid neural network architecture by adopting a loss function driven by a first principle, wherein the loss function is formed by weighting a data fitting error term and an electrochemical kinetics constraint term through a dynamic weight factor; and finally, inputting the fused feature vectors into a classifier, and outputting a battery cell leakage risk level. According to the invention, the sensitivity and accuracy of early detection of battery cell leakage can be improved, the calculation complexity is reduced, and the safe operation of a lithium ion battery system is ensured.

The application discloses a zinc negative electrode, a preparation method thereof and a water-based zinc-based electrochemical energy storage device. The zinc negative electrode comprises a negative electrode substrate formed by metal zinc and a tungsten oxide protective layer; the tungsten oxide protective layer is formed by in-situ electrochemical reaction of metal zinc and tungsten acid root. The preparation method comprises the following steps: providing a negative electrode substrate; contacting with a reaction solution and generating in-situ electrochemical reaction to deposit a tungsten oxide protective layer, thereby obtaining a zinc negative electrode; wherein the reaction solution contains tungsten acid root. The zinc negative electrode provided by the application has excellent corrosion resistance, can significantly reduce the occurrence of water-induced side reactions in an acidic electrolyte, avoid additional zinc loss, improve the coulomb efficiency and utilization rate of the zinc negative electrode; and the polarization degree of the zinc negative electrode is low, and a strong interaction of chemical bond is formed between the protective layer and the metal zinc, so that the electrochemical energy storage device composed of the zinc negative electrode provided by the application has excellent electrochemical kinetic performance and cycle performance.

The application discloses a Mo gradient doped high-nickel material and a preparation method and application thereof. The Mo gradient doped high-nickel material prepared by the application realizes body phase Mo doping and surface Li2MoO4 coating. A Mo-O-Ni spring structure formed by the material can delay harmful phase transition hysteresis, inhibit more serious cation mixing, enhance stable ion / electron transmission, Mo doping can effectively improve electrochemical kinetics under high voltage and enhance the rate performance. The Li2MoO4 coating can inhibit electrolyte decomposition and hinder oxygen escape in the body phase, promote reversible oxygen oxidation and reduction, build a stable thin and dense CEI layer, and prolong the cycle life. The application shows excellent electrochemical performance in a half-cell system, and also shows broad application prospects in a full-cell system matched with commercial graphite.

The invention provides a potassium ion / metal battery high-entropy negative enthalpy Prussian blue analogue positive electrode material and a preparation method thereof, the material also comprises ions of at least five different metal elements in addition to potassium ions, and the preparation method comprises the following steps: synthesizing the material by using a cyanide complex with the chemical formula of Kx [M '(CN) 6], potassium salt and salts of various metals as raw materials and adopting a coprecipitation method. On the basis of the design of the high-entropy component, the disorder of an N coordination environment can be remarkably improved, and then generation of anion defects is inhibited; the high-entropy negative enthalpy structure can significantly enhance the structural stability of the material, and further inhibits complex phase state transition caused by Jahn-Teller lattice distortion, Fouli repulsion, d-pi orbit overlapping and coulomb gravitation change. The regulated electronic structure can eliminate band gaps and reduce potassium ion diffusion barriers, so that the electrochemical dynamic behavior is enhanced; the high element compatibility in the high-entropy component can significantly weaken the accumulation of lattice stress in long-term circulation so as to enhance the electrode stability. Therefore, the prepared series of high-entropy negative-enthalpy electrode materials have high reversible specific capacity, high working voltage and excellent rate capability and cycling stability.

The invention provides a micro cylindrical mirror array manufacturing method based on electrochemical corrosion, and belongs to the technical field of optical element precision manufacturing, and the method comprises the steps: cutting the surface of a substrate through a precision cutting technology to form an initial groove structure, then placing the initial groove structure in an electrolyte, constructing an electrochemical reaction system, and forming a micro cylindrical mirror array; applying an electric field to guide ions in the electrolyte to generate a selective dissolution reaction with the surface of the groove; and regulating and controlling process parameters of an electrochemical reaction system, so that the bottoms of the grooves are gradually rounded, bent and evolved under the driving of interface energy and the action of electrochemical kinetics, then the sections of the grooves evolve to form a cylindrical form with a target curvature, and finally, the micro cylindrical mirror array is obtained. The technical problems that in existing micro cylindrical mirror array manufacturing, a curved surface is difficult to construct accurately, the array consistency is insufficient, the process is complex, the material adaptability is poor, and products with high surface quality, controllable curvature radius and high array consistency cannot be efficiently obtained under the condition that a complex photoetching structure and high-energy beam processing are not needed are solved.

The present invention pertains to the field of battery technology and provides a 3DP-nano-micro composite electrode material for high-performance lithium-ion storage, along with its preparation method. In this disclosure, a the V2O5—Ti2C3—Au nanocomposite cathode material featuring a hierarchical heterostructure for high-performance lithium ion energy storage is disclosed, comprising a 3D-printed V2O5—Ti2C3—Au cathode, in which an in-situ TiO2 interface forms via synergistic interactions between V2O5, Ti2C3Tx, and Au nanoparticles. The TiO2 interface introduces abundant oxygen vacancies that act as Li+ adsorption sites. Au nanoparticles contribute to interfacial redox dynamics, catalysis, and conductivity, forming Au—Ti intermetallics that act as conductive bridges, reduce interfacial resistance, and reinforce mechanical stability. The 3D-printed nanocomposite cathode is manufactured by DIW printing technology, which can accurately control the structure and spatial distribution of the active material, thereby shortening the ion / electron pathway and improving the electrochemical kinetics.

The invention relates to the field of batteries, in particular to a positive electrode material, a preparation method thereof and a battery. The positive electrode material comprises an inner core and a coating layer coating the surface of the inner core, the chemical general formula of the inner core is Na3V < 1.925-x-y > Mn < x > Al < y > Mg < 0.075 > (PO4) 3, x is smaller than or equal to 0.4, and y is smaller than or equal to 0.3; and the coating layer comprises a carbon coating layer. The positive electrode material provided by the invention comprises a manganese, aluminum and magnesium co-doped NVP inner core and a carbon coating layer coating the surface of the inner core, al < 3 + >, Mn < 2 + > and Mg < 2 + > are synergistically introduced into a Na3V2 (PO4) 3 crystal lattice, and the outer layer of the Na3V2 (PO4) 3 crystal lattice is coated with a carbon layer, so that crystal structure regulation and control and collaborative optimization of electrochemical kinetics can be realized, and the working voltage and low-temperature sodium storage capacity of the material are effectively improved while the structural stability is maintained, so that the application requirements of energy storage and low-temperature starting equipment in a cold region are met.

The invention discloses a manganese-rich precursor, a preparation method thereof and a positive electrode material, and relates to the technical field of lithium ion battery materials. The preparation method comprises the following steps: simultaneously adding a metal salt solution, a precipitator and a complexing agent into a reaction kettle through a metering pump to carry out coprecipitation reaction, and pumping a hydrogen peroxide solution into a reaction system in stages through the metering pump in the reaction process to carry out liquid-phase micro-oxidation treatment. The prepared precursor is spherical secondary particles and is formed by interweaving nanoscale particles and flaky primary particles. According to the method, the stable high-valence manganese oxide is constructed on the surface of the precursor in situ by utilizing the direct and uniform oxidation effect of hydrogen peroxide in a liquid phase, so that the prepared positive electrode material has excellent electrochemical kinetics and structural stability at the same time.

The invention provides a double-layer interface coated positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment, and relates to the field of lithium ion batteries. The double-layer interface coated positive electrode material comprises an inner core, and a first coating layer and a second coating layer which are sequentially stacked on the surface of the inner core, wherein the first coating layer comprises metal sulfide; the second coating layer comprises a metal nitride; the chemical general formula of the inner core is LiCoxY (1-x) O2, Y comprises at least one of Ni, Mn and Al, and x is more than or equal to 0.03 and less than or equal to 1. The double coating layers are subjected to targeted interface improvement, the ionic conductivity and low-temperature dynamic performance of the material are improved, the initial impedance of the material is reduced, an ion-electron double high-conductivity network is constructed through internal-external cooperation, the defect of single crystallization of the positive electrode material is overcome, and the electrochemical kinetics, cycling stability and other performance of the positive electrode material are improved.

The invention discloses a distribution order equivalent circuit modeling method for representing the aging state of a lithium battery, and relates to the technical field of lithium battery modeling. The method comprises the following steps: firstly introducing a distribution order calculus theory into equivalent circuit modeling of the lithium ion battery, defining a distribution order weight function in a continuous order interval, then introducing a double-Beta distribution hybrid model to carry out parametric modeling on the distribution order weight function, and further providing an identification strategy for mutual decoupling of an intensity parameter and a normalized weight function. And meanwhile, in combination with weighted nonlinear least square and physical constraint optimization, stable and interpretable identification of continuous order distribution is realized. Therefore, a characterization index system of the aging state of the lithium battery is constructed, the mapping relation between the characterization index system and a specific aging mechanism is determined, and quantitative expression of hidden aging information in a continuous time scale from the impedance spectrum is achieved. The problem that traditional integer order and single fractional order equivalent circuit models are limited in the aspect of describing the multi-time-scale electrochemical dynamic behavior of the lithium ion battery is solved.