38 results about "Intrinsic conductivity" patented technology

The invention relates to the technical field of lithium ion batteries, in particular to a chromium-molybdenum double-doped lithium iron phosphate material as well as a preparation method and application thereof. The preparation method is used for solving the problems of low capacity, low electronic conductivity and poor cycling stability of the existing lithium iron phosphate material. According to the preparation method, chromium-molybdenum is doped into lithium iron phosphate, and the bond energy of a Cr-O bond and a Mo-O bond is stronger than that of a Fe-O bond, so that the dissolution loss of Fe < 2 + > in long-term circulation is reduced, and the battery capacity and the intrinsic electron conductivity of the material are improved; lithium iron phosphate is coated with nitrogen-doped carbon nanotubes, and nitrogen is doped in graphite crystal lattices of the carbon nanotubes, so that additional free electrons are provided, the intrinsic conductivity is improved, the resistance is reduced, the rate capability is improved, and the cycle life is prolonged; the polyaniline coating layer forms a barrier layer on the surface of the lithium iron phosphate particles, so that the cycle performance and the battery capacity are improved; the three components cooperate to improve the capacity, conductivity, rate capability and cycling stability of the material.

The invention discloses a zinc ion battery and a preparation method thereof, the zinc ion battery comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte, and the zinc ion battery is characterized in that the positive electrode comprises a vanadium-based material, and the vanadium-based material comprises vanadium pentoxide intercalated by water molecules and metal ions and an MXene coating layer; the electrolyte comprises zinc salt, water and an additive, the additive comprises positive ions and negative ions, and the negative ions have the structure shown in the formula I. According to the zinc ion battery, water molecules and metal ions are used for intercalating vanadium pentoxide and coating MXene, and the water molecules and the metal ions are cooperatively used with the electrolyte with specific composition, so that ions can be quickly intercalated / deintercalated, the intrinsic conductivity of the material is enhanced, the structure of the material is stabilized, vanadium dissolution / metal ion dissolution at the positive electrode side can be prevented, and the service life of the zinc ion battery is prolonged. And the side reactions of interface hydrogen evolution and corrosion caused by decomposition of active water molecules on the zinc negative electrode side are synergistically inhibited. Through the comprehensive action of the factors, the zinc ion battery has excellent electrochemical performance.

The invention relates to the field of sodium-ion batteries, in particular to a high-conductivity carbon-coated sodium-electropolyanion positive electrode material and a preparation method thereof. The nitrogen-containing substance and the high-molecular polymer are compounded, and the high-molecular polymer is an excellent carbon skeleton and a precursor, so that a continuous, compact and uniform carbon coating layer is formed, and a main skeleton of carbon is provided; the rich nitrogen source realizes high-level nitrogen doping, and nitrogen atoms and adjacent carbon atoms form conjugated pi bonds, so that charge transfer and structural stability are facilitated, and the intrinsic conductivity of the carbon layer is remarkably improved; a high-efficiency electronic conductive network can be formed by a strategy of compounding a high-molecular carbon skeleton and a nitrogen-rich molecular dopant, the transmission kinetics of electrons and ions is optimized, high conductivity and good structural characteristics are considered, and the conductivity and stability of the polyanion material are synergistically improved.

This application discloses a cathode material, a secondary battery, and an electrical device, relating to the field of battery technology. The cathode material provided in this application introduces vanadium, a modified element, into the core, and forms an interface layer comprising vanadium on at least a portion of the core's surface. Simultaneously, a conductive layer is introduced on at least a portion of the interface layer's surface. The resulting cathode material exhibits good bulk intrinsic conductivity and excellent structural stability. The corresponding secondary battery possesses high initial discharge specific capacity, as well as excellent initial coulombic efficiency and cycle performance.

The invention discloses a method for constructing a high-performance alpha-phase nickel hydroxide positive electrode plate, and aims to solve the problem that the electrochemical performance cannot be exerted in a total battery due to poor intrinsic conductivity of traditional alpha-phase nickel hydroxide. According to the method, multiple conductive components are introduced in the preparation process of an alpha-phase nickel hydroxide positive electrode to construct a composite conductive network, and the conductive network comprises cobalt-coated beta-phase nickel hydroxide, cobalt-doped alpha-phase nickel hydroxide, cobalt-coated alpha-phase nickel hydroxide, carbon black and the like. Through effective compounding of the material and alpha-phase nickel hydroxide, the electron transmission capability and the structural stability of the alpha-phase nickel hydroxide positive electrode are remarkably improved. After the prepared positive electrode plate is assembled into a nickel-metal hydride battery or a zinc-nickel battery, a performance test is carried out, and a result shows that the nickel-metal hydride battery or the zinc-nickel battery has higher discharge capacity and more excellent cycle life. The method disclosed by the invention is simple in process, high in operability and suitable for development and application of the positive electrode plate of the high-performance alkaline secondary battery, and has a good industrialization prospect.

This invention relates to the field of functional liquid crystal materials technology, and discloses a method for preparing and applying a spiropyran-based ionic conductive cholesteric phase liquid crystal elastomer with multimodal sensing characteristics. This liquid crystal elastomer is prepared by co-polymerization of a spiropyran derivative as the core unit for photo / thermal / mechanical response with polymerizable liquid crystal monomers, chiral agents, thiol crosslinking agents, ionic liquids, and initiators. Its core mechanism is that the microscopic isomerization of spiropyran molecules is amplified into a change in the mesoscopic polymer arrangement through intermolecular synergistic effects. Simultaneously, relying on the intrinsic conductivity difference between the ionic anthocyanin (MC) and non-ionic spirocyclic (SP) phases, precise control of macroscopic conductivity is achieved. This composite material achieves multiple responses with a single spiropyran component, enabling the construction of multimodal flexible sensors. It addresses the pain points of complex structures and poor compatibility in traditional sensors, and has significant research value in fields such as smart wearables, electronic skin, and healthcare.

The invention discloses a sodium ferric sulfate composite positive electrode material with high electronic conductivity and a preparation method thereof, the chemical formula of the sodium ferric sulfate composite positive electrode material is Na < 2-2x > M < x > Fe < z > N < y > (SO4) 3, m is one or more than two of Ca, Mg < 2 + > and Sr; n is one or more than two of Ti, V, Mo and W; the value range of x and y is 0 lt; x is less than or equal to 0.1, 0lt; y < = 0.2; and the values of x, y and z meet the charge balance relationship that the whole compound is electrically neutral. The sodium ferric sulfate composite positive electrode material with high electronic conductivity and the preparation method thereof have the characteristics of high intrinsic conductivity, good structural stability, excellent rate capability and high energy density.

This invention discloses an electrocatalyst with enhanced catalytic performance through an ohmic contact and its applications. A NiMo alloy is anchored on the surface of a semiconductor NiCuP microflower using electrodeposition. By precisely controlling the work function matching between NiMo and NiCuP, an ohmic contact heterointerface is successfully constructed. This effectively eliminates the Schottky barrier at the heterostructure interface and removes the energy barrier for interfacial charge transport, thereby significantly optimizing the intrinsic conductivity of the catalyst and accelerating the transfer of electrons from the catalyst interior to the surface active sites. Benefiting from this efficient interfacial electron transport channel, the catalyst exhibits significantly enhanced catalytic activity in the cathode hydrogen evolution reaction. In the anodic half-reaction, a more thermodynamically favorable FOR is used instead of OER, enabling energy-saving hydrogen production by coupling the cathode HER at a lower battery voltage. Simultaneously, at the anode, furfural, a biomass-derived platform molecule, is efficiently converted into high-value-added furoic acid.

The application discloses a preparation method of a gradient sulfur-doped silicon-based negative electrode material, the negative electrode material and application. The preparation method of the gradient sulfur-doped silicon-based negative electrode material comprises the following steps: metal reduction pretreatment of a silicon-based material by using a metal material to obtain a pretreated product; acid washing of the pretreated product, then water washing and drying to obtain an acid-washed product; treatment of the acid-washed product by using ammonia water, then water washing and drying to obtain a hydroxylated product; the hydroxylated product is placed in a furnace, heated under an inert atmosphere, gradient heating to at least two different temperatures and heat preservation, sulfur doping treatment of the hydroxylated product in the heat preservation stage, then further heating, carbon deposition, sieving and magnetic removal to obtain the gradient sulfur-doped silicon-based negative electrode material. The application can effectively improve the intrinsic conductivity and performance stability of the silicon-based negative electrode material, is beneficial to improving the specific capacity and initial efficiency of the material, and makes the material have higher rate and cycle performance.

The invention discloses an antioxidant copper-based alloy foil tape. The surface of the foil tape is provided with a composite protective film layer; the composite protective film layer comprises a transition bottom layer formed by plasma electrolytic oxidation and a nanocrystalline tin-indium alloy hole sealing surface layer formed by electro-deposition from inside to outside; the total thickness of the composite protective film layer is 15-30 [mu] m. According to the invention, a composite structure of a plasma electrolytic oxidation bottom layer and a nano tin-indium alloy surface layer is created for the first time, so that the foil tape has excellent oxidation resistance and corrosion resistance through the synergistic effect of multiple mechanisms such as physical isolation, chemical passivation and electrochemical protection. Meanwhile, the conductive function is mainly borne by the high-conductivity nano metal layer on the surface layer, the bottom layer is designed to be extremely thin, and the conductivity is optimized through element doping, so that the influence of the composite film layer on the intrinsic conductivity of the substrate is reduced to an extremely low level; and the core contradiction that the protection performance and the conductivity are mutually restricted in the traditional surface treatment technology is successfully solved.

The invention relates to a preparation method of a Mn-EG-MoS2 flexible electrode with a hierarchical confinement structure. The Mn-EG-MoS2 flexible electrode with the hierarchical confinement structure is prepared mainly through a strategy of manganese (Mn) doping and ethylene glycol (EG) covalent intercalation. According to the invention, introduction of manganese atoms can limit and effectively regulate and control the electronic structure of MoS2 from an atomic level, promote conversion from a 2H phase to a 1T phase of MoS2, increase the density of active sites and improve the intrinsic conductivity. EG molecules expand the interlayer spacing of MoS2 through the covalent intercalation effect, so that re-stacking of nanosheets is effectively inhibited, the number of exposed active sites is increased, and meanwhile, a rapid channel is provided for ion transmission. According to the structural design, the specific capacitance and the structural stability of the material are greatly improved. When the material is applied to the negative electrode of the supercapacitor, the mass specific capacitance is increased to more than three times of that of unmodified molybdenum disulfide, and the material shows excellent cycling stability.

The invention relates to the technical field of battery materials, in particular to a high-performance cobaltosic oxide precursor and a preparation method thereof, and the preparation method comprises the following steps: S1, preparation of a first solution, S2, preparation of a second solution, S3, preparation of a third solution, S4, precipitation reaction treatment, S5, pretreatment, and S6, calcination treatment. According to the preparation method disclosed by the invention, the prepared material is treated by adopting the treating fluid, and the specific mixed gas is introduced in the subsequent calcining process, so that the doped carbon coating layer is successfully constructed on the surface of the cobaltosic oxide precursor, thereby solving the core problem of low intrinsic conductivity, and when the doped carbon coating layer is used for preparing the high-voltage lithium cobalt oxide positive electrode, the charge transfer impedance of the electrode can be greatly reduced; and the cycling stability of the battery under high voltage is obviously improved.

This invention relates to the field of electrochemical energy storage technology, specifically providing a high-capacity stable manganese-iodine composite material, its preparation method and application, a cathode material preparation method, a cathode sheet, and a zinc-ion battery. The manganese-iodine composite material comprises manganese oxide, iodide, and a conductive agent. To address the issue of low intrinsic conductivity of manganese oxide, the introduction of highly conductive iodide significantly improves the electronic conductivity of the composite material. The iodide, through a rapid redox reaction, constructs a three-dimensional permeable electron transport network, thereby greatly improving the electronic conductivity of the composite material. A precisely matched redox potential synergistic system is formed between the iodide and manganese oxide. This nearly overlapping electrochemical window enables a "potential relay" synergistic reaction mechanism, effectively reducing the Mn content. 4+ / Mn 3+ The activation energy barrier and reaction kinetics of the reaction. These characteristics together constitute a high-performance, highly stable aqueous zinc-manganese battery system.

The invention relates to a conductive agent and a preparation method and application thereof, in particular to the technical field of batteries. The conductive agent has a core-shell structure, and comprises: a metal core; the gradient titanium nitride layer is coated on the surface of the metal core; the alloy interface layer is formed between the metal core and the gradient titanium nitride layer; wherein the content of nitrogen in the gradient titanium nitride layer is gradually increased from inside to outside in a gradient manner. The conductive agent provided by the invention is used for solving the problems that a traditional carbon-based conductive agent for a sodium ion battery in related technologies limits high rate performance due to low intrinsic conductivity and is easy to oxidize and corrode in an alkaline electrolyte to cause poor cycle stability, and the effective conductivity is severely reduced due to introduction of high interface resistance in an existing surface coating technology.

The invention provides a lithium-rich manganese-based positive electrode material for a solid-state battery as well as a preparation method and application of the lithium-rich manganese-based positive electrode material. The lithium-rich manganese-based positive electrode material sequentially comprises a lithium-rich manganese-based inner core, a first coating layer and a second coating layer from inside to outside, wherein the surface of the lithium-rich manganese-based inner core is coated with the first coating layer; the surface of the first coating layer is coated with the second coating layer; wherein the first coating layer is made of a niobium-tantalum composite oxide, the second coating layer is made of a conductive carbon material and a solid electrolyte material, and the solid electrolyte material is dispersed in the conductive carbon material. The lithium-rich manganese-based core is subjected to multi-stage coating design, so that Li < + > transmission is promoted, interface side reaction is inhibited, and the problem of low intrinsic conductivity of the lithium-rich manganese-based material is solved; and an ion transmission channel is constructed in advance, so that the positive electrode-electrolyte interface impedance is reduced, and the rate capability and the cycle performance of the solid-state battery are improved.

This invention relates to the field of sodium-ion battery materials technology, and discloses a high-entropy doped polyanionic cathode material and its preparation method. It aims to solve the problems of low intrinsic conductivity, poor capacity performance under high compaction density, and easy component segregation in traditional sodium iron pyrophosphate-based cathode materials. The method involves wet mixing of Fe source, at least three M sources, P source, and Na source in deionized water according to the product molar ratio, adjusting the pH to 0-3 to obtain a precursor solution with a total Fe and M ion concentration of 1-4 mol / L. The precursor powder is obtained by spray pyrolysis, then mixed with a carbon source and calcined under an inert atmosphere to obtain the target material. This invention achieves uniform mixing of multiple elements at the atomic scale, optimizes the electronic structure of the material, maintains excellent capacity performance under high compaction density, and significantly improves the volumetric energy density of the battery. Furthermore, the preparation process is short, controllable, and reproducible, showing excellent prospects for industrialization and commercial application.

The invention discloses a method for improving the conductivity of sodium ferric phosphate slurry, and particularly relates to the field of sodium ion batteries. Aiming at the problems of poor intrinsic conductivity, large battery polarization and low rate capability of a sodium iron phosphate positive electrode material, Super P carbon black and a carbon nanotube are compounded as a conductive agent, and an optimized slurry preparation process is combined, so that an efficient three-dimensional conductive network is constructed between active substance particles and between the particles and a current collector. The preparation method comprises the following specific steps: mixing a PVDF glue solution, SP and CNTs through a defoaming machine, adding sodium ferric phosphate and N-methyl pyrrolidone, dispersing to prepare positive electrode slurry, and coating and drying to prepare an electrode. According to the method, by regulating and controlling the proportion and process parameters of SP and CNTs, the slurry resistance, ohmic resistance and charge transfer resistance are remarkably reduced, the conductivity and electrochemical performance of the electrode are improved, high-rate charging and discharging, long cycle life and good low-temperature performance are achieved, and the method is suitable for large-scale preparation of the sodium ion battery positive electrode.

The application discloses a kind of stress-induced lattice distortion and in-situ self-assembly of lithium nickel phosphate anode material and its preparation method, belong to lithium ion battery technical field.The application first prepares defect-rich nickel-based precursor, constructs lattice stress by low-temperature topological phosphorization, in-situ conversion in autoclave, then releases and fixes lattice distortion by ultrafast thermal shock, simultaneously realizes directional carbonization of organic carbon source, forms the dual-conducting structure of lattice distortion conducting channel + in-situ carbon network.The intrinsic conductivity of the obtained material is significantly improved, the 0.1C discharge specific capacity can reach 142mAh / g, the capacity retention rate reaches 91.2% after 200 cycles at 1C, with high specific capacity and excellent cycle stability, suitable for high energy density lithium ion battery.

This invention relates to the field of lithium-ion battery technology, specifically to a chromium-molybdenum dual-doped lithium iron phosphate material, its preparation method, and its application; it addresses the problems of low capacity, low electronic conductivity, and poor cycle stability in existing lithium iron phosphate materials. The preparation method involves doping lithium iron phosphate with chromium-molybdenum, where the bond energies of Cr-O and Mo-O bonds are stronger than those of Fe-O bonds, thus reducing the Fe content during long-term cycling. 2+ The dissolution and loss of lithium iron phosphate improves battery capacity and intrinsic electronic conductivity; nitrogen-doped carbon nanotubes coat lithium iron phosphate, with nitrogen doping in the graphite lattice of carbon nanotubes, providing additional free electrons, improving intrinsic conductivity, reducing resistance, and improving rate performance and cycle life; the polyaniline coating layer forms a barrier layer on the surface of lithium iron phosphate particles, improving cycle performance and battery capacity; the three work synergistically to improve the material's capacity, conductivity, rate performance, and cycle stability.

The application discloses a kind of high-conductivity and high-toughness carbon-coated current collector and preparation method thereof, and relates to the technical field of current collector.The present application aims to solve the problem that the carbon-coated current collector is damaged in subsequent processing, such as slitting, rewinding and positive active material coating, due to mechanical stress on the whole current collector, making it difficult to produce battery packs, and causing a conflict between the requirements of low internal resistance and high conductivity for battery performance. Therefore, by providing PANI / P(BA-co-DVB) core-shell composite microspheres that can be used as a toughening agent in the raw material, they can be easily integrated into the existing carbon-coated slurry homogenization process. This material enables the final carbon-coated layer to achieve excellent toughness to resist processing stress while its intrinsic conductivity also improves the overall electrical performance of the battery.

The application discloses a magnesium-aluminum co-modified manganese iron lithium phosphate positive electrode material and a preparation method and application thereof, and relates to the technical field of battery positive electrode material preparation. x Fe y Mg m Al n PO4, wherein 0.5<=x<0.7, 0.3<=y<0.5, 0.01<=m<=0.04, 0.005<=n<=0.02, and x+y+m+n=1. In the application, magnesium and aluminum are doped into transition metal sites, magnesium doping can effectively inhibit Jahn-Teller effect, and is helpful to stabilize the material crystal structure and improve the cycle stability; aluminum doping can introduce holes, and significantly improve the intrinsic conductivity of the material; and co-doping can simultaneously solve the problems of poor material stability and low conductivity.

The application discloses a kind of electrolyte low temperature conductivity test method, controller, medium and product, it is related to electric variable measurement field.Method includes: in response to test channel temperature reaches target low temperature value, obtains conductivity-time sequence and carries out differential processing, obtains first-order change rate sequence and second-order change acceleration sequence;When sequence meets the quasi-steady condition that first-order rate and second-order acceleration are less than preset threshold value, extract quasi-steady data segment;According to preset evolution function model, the quasi-steady data segment is nonlinearly fitted, and target evolution function is constructed;Finally, the limit value of function when time tends to infinity is calculated as the predicted conductivity.The application aims to solve the problem of long test cycle and non-steady state misjudgment caused by the long and slow change of thermal equilibrium process in traditional low temperature test, by multidimensional derivative determination and model extrapolation prediction, the intrinsic conductivity is accurately obtained when physical thermal equilibrium is not reached, and the detection efficiency and accuracy of electrolyte low temperature conductivity are improved.

This invention discloses a bifunctional nano-modification method for high-performance layered ammonium vanadate cathode materials used in aqueous zinc-ion batteries. The aim is to address the problems of easy collapse of the layered structure, low intrinsic conductivity, and severe vanadium dissolution associated with ammonium vanadate (NVO) as a cathode in aqueous zinc-ion batteries. This method utilizes tetramethylammonium ions (TMA)... + A bifunctional nanoengineering strategy combining the pillar effect and the conductive hybridization of graphene oxide (GO) was employed, firstly by incorporating NH4 in the interlayer of NVO. + Replace with TMA + As a molecular column, TMA was obtained. + Intercalated TNVO was then combined with GO to construct a continuous two-dimensional conductive network, thus obtaining a TNVO@GO nanocomposite cathode material. The modified material of this invention exhibits increased interlayer spacing, significantly reduced lattice strain, and a substantial increase in conductivity, while effectively suppressing vanadium dissolution, thereby significantly improving the electrochemical performance of vanadium-based materials for aqueous zinc-ion batteries.

The application provides a preparation method of a high-conductivity molybdenum disulfide nanosheet catalyst, comprising the following steps: 1) mixing a metal molybdenum salt, a metal chromium salt and thiourea to obtain a first composite carrier; 2) dispersing the first composite carrier in water to obtain a first composite carrier suspension; 3) reacting the first composite carrier suspension under a sealed condition, and post-treating the obtained product; 4) dispersing the obtained second composite carrier and a metal scandium salt in water, and reacting to obtain a catalyst. The molybdenum disulfide nanosheet catalyst prepared by the application introduces transition metal atoms (such as Cr and Sc), utilizes the local electronic effect and defect effect generated in the molybdenum disulfide, creates more carriers, makes the electrons efficiently transfer in the molybdenum disulfide nanosheet catalyst, and improves the intrinsic conductivity of the catalyst; the prepared catalyst has good performance, a good layered structure and uniform dispersion; compared with the existing commercial platinum-based catalyst, the catalyst has a lower cost.

The invention provides a doped modified lithium iron phosphate positive electrode material, a preparation method thereof and a lithium ion battery, and aims to solve the technical problem that high conductivity, high tap density and good low-temperature performance are difficult to consider at the same time in the conventional modification technology. The preparation method comprises the following steps: carrying out wet sanding and spray drying granulation on a lithium source, an iron source, a phosphorus source, a carbon source and a dopant, and sintering in a protective atmosphere. According to the invention, the intrinsic conductivity, the ion diffusion rate and the tap density of the material are remarkably improved through double-site synergistic doping of the Li site and the Fe site. The discharge specific capacity of the obtained material at 0.1 C reaches up to 163mAh / g, the 5C rate capacity retention rate reaches 88%, the low-temperature capacity retention rate at-20 DEG C reaches 67%, and the cycle performance is excellent. The material can be used for preparing lithium ion batteries with high energy density, high power and high and low temperature adaptability. The material has the advantages of high conductivity, excellent rate capability, high tap density and good low-temperature performance.

The invention belongs to the field of electrochemical energy storage materials, and discloses a high-conductivity conjugated coordination polymer as well as preparation and application thereof in a low-temperature battery. According to the polymer, 5, 8-dihydroxy-1, 4-naphthoquinone is taken as an organic ligand, transition metal ions are taken as a metal center, and a pi-d conjugated structure with a plane is formed by removing coordinated water, so that the polymer shows high intrinsic conductivity. As an electrode active material, the material can effectively solve the problem that the capacity of a secondary battery is suddenly reduced due to lattice shrinkage of an electrode material and reaction kinetics hysteresis in a low-temperature environment. The material has rapid charging capability and super-long cycle life, and an organic battery assembled by the material can still keep over 80% of capacity at an extremely low temperature of-40 DEG C. The invention provides a key material solution for developing energy storage equipment with wide temperature range and high performance.

The application discloses a kind of based on melting polymerization hetero-linkage type COFs material, one-pot synthesis method and application thereof, the hetero-linkage type covalent organic framework material based on melting polymerization is formed frame structure by covalently connecting ethene bond and polyimide bond, the one-pot synthesis method includes that active methyl and amino-containing heterocyclic monomer, aromatic aldehyde monomer, aromatic dianhydride monomer are mixed with fluxing agent, under solvent-free condition, melting polymerization reaction is carried out, and the target product is obtained.The application creatively provides a kind of hetero-linkage type COFs material with the covalent connection bond of ethene bond and polyimide bond in frame structure, it contains the redox active site formed by carbonyl and heterocyclic simultaneously in its skeleton and the intrinsic electronic transmission channel constructed by ethene bond, with high active site density and intrinsic conductivity, show excellent structural stability and electrochemical performance, has wide application prospect in battery electrode material and electrocatalysis and other energy fields.

The invention relates to the technical field of MXene materials, in particular to a preparation method of ultrahigh intrinsic conductivity MXene based on segmented regulation and control of functional groups. The method comprises the steps that large-particle Ti3AlC2 MAX is subjected to sufficient etching and oscillation uniform shaking separation to obtain large-area Ti3C2Tx MXene, surface functional groups of MXene are regulated and controlled in a segmented mode through a nucleophilic and electrophilic strategy, conversion of a large amount of Ti-OH / F / Cl to high-state-density Ti-O-Ti functional groups is achieved, meanwhile, an antioxidant effectively prevents fracture of Ti-C bonds in the hydrothermal process, and therefore the integrity of an intrinsic two-dimensional structure of MXene is maintained, and the preparation process is simple and convenient. And the intrinsic conductivity of MXene and the conductivity of a film electrode are obviously improved.

The invention relates to the technical field of equivalent conductivity testing, and discloses a non-continuous conductive layer equivalent conductivity testing system and method based on simulation inversion and a medium, and the system comprises a testing module which is used for testing a first testing sample corresponding to a magnetic conductive layer of a tested magnetic shielding device to obtain each conductivity, the acquisition module is used for acquiring the initial magnetic conductivity of the second test sample under different magnetic field frequencies and acquiring the actual magnetic field intensity of the tested magnetic shielding device in the magnetic shielding space under different magnetic field frequencies and different excitation magnetic field intensities; the processing module is used for determining intrinsic conductivity, a first relation curve and a second relation curve on the basis of each conductivity acquired from the test module, the initial magnetic conductivity under different magnetic field frequencies and the actual magnetic field intensity in the magnetic shielding space under different magnetic field frequencies and different excitation magnetic field intensities, and performing inversion optimization by using a preset simulation model to obtain a simulation result; and obtaining the target equivalent conductivity of the non-continuous conductive layer of the tested magnetic shielding device.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a cycle-stable spinel-phase high-entropy oxide negative electrode material as well as preparation and application thereof. Aiming at the defects of low intrinsic conductivity, poor cycle and rate performance and the like of a high-entropy oxide negative electrode material, the invention provides a cycle-stable spinel-phase high-entropy oxide negative electrode material, the high-entropy oxide (Cr0. 2Mn0. 2Fe0. 2Co0. 2M0. 2) 3O4 with a spinel single phase is prepared by matching different element valence states and regulating and controlling the phase structure of entropy oxide (Cr0. 2Mn0. 2Fe0. 2Co0. 2M0. 2) 3O4 in spinel, and the high-entropy oxide (Cr0. 2Mn0. 2Fe0. 2Co0. 2M0. 2) 3O4 can be used for preparing the spinel-phase high-entropy oxide negative electrode material. M is any one of Li, Na, Mg, Zn, Cu and Al, so that the performance of the material in a lithium ion battery is improved.