57 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 provides a composite positive electrode material and a preparation method and application thereof. The composite positive electrode material comprises a lithium manganese iron phosphate inner core, and an inorganic coating layer and an organic coating layer which sequentially coat the surface of the lithium manganese iron phosphate inner core, wherein the inorganic coating layer comprises a lithium niobate tantalate material, and the organic coating layer comprises polypyrrole and polyolefin. By adopting an inorganic-organic composite coating strategy, on one hand, the high stability of the lithium niobate tantalate material is taken as a core support, the volume expansion of the positive electrode material in the charging and discharging process is inhibited, the structural stability of the material in a high-temperature and high-voltage environment is enhanced, and the potential safety hazard is reduced; on the other hand, by means of high conductivity of polypyrrole, the problem that the intrinsic conductivity of the positive electrode material is low is solved, the rate capability of the battery is effectively improved, meanwhile, the interface protection effect of polyolefin is utilized, the interface side reaction and dissolution of metal ions such as Mn and Fe are inhibited, and the cycle life of the battery is prolonged.

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 present disclosure pertains to a method of sensing an analyte in a sample by: (1) exposing the sample to an electrode that includes a covalent-organic framework with a plurality of metal-coordinated aromatic units that are linked to one another by aromatic linkers; (2) detecting a change in a property of the electrode; and (3) correlating the change in the property to the presence or absence of the analyte. The present disclosure also pertains to said covalent-organic framework and methods of making the covalent-organic frameworks.

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.

The invention discloses a copper-graphene composite material and a preparation method thereof.The composite material comprises a copper matrix and graphene serving as a reinforcing phase, the graphene is dispersed and distributed at the grain boundary of the copper matrix and in the grain boundary, and the graphene at the grain boundary is of a three-dimensional network structure and wraps the copper matrix; in the cross section of the composite material, the sum of the lengths of the graphene horizontally oriented in the crystal boundary accounts for 60% or above of the sum of the lengths of all the graphene in the crystal boundary, and the variable coefficient of the grain size of the copper matrix is smaller than or equal to 30%. The composite material has excellent strength, corrosion resistance, high-temperature oxidation resistance and intrinsic conductivity, the tensile strength of the composite material is larger than or equal to 280 MPa, the conductivity of the composite material is larger than or equal to 95% IACS, the thickness of an oxidation layer obtained after 180 DEG C / 100 h high-temperature oxidation is smaller than or equal to 20 micrometers, and the local pitting corrosion area rate obtained after 1000 h salt spray test is smaller than 10%. The composite material is excellent in comprehensive performance and low in manufacturing cost, has a good industrialization prospect, and can meet the key requirements of the electronic and electrical industry on high-conductivity, high-temperature stability and long-life conductors.

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 relates to a high-strength and high-conductivity rhenium and / or rhenium oxide dispersion strengthened copper alloy and a preparation method thereof, and belongs to the technical field of metal-based composite materials. The alloy is prepared by taking rhenium (Re) and rhenium oxide (ReOx) as dispersion strengthening phases through a composite process of airflow crushing, cold isostatic pressing, hydrogen reduction, spark plasma sintering and hot extrusion. The intrinsic conductivity and rhenium effect of rhenium and / or rhenium oxide are utilized, the alloy strength is remarkably improved, and meanwhile the problem that the conductivity and the heat conductivity are reduced due to a traditional Al2O3 dispersed phase is effectively solved. The density of the obtained alloy is not lower than 99.5%, the tensile strength reaches 500 MPa or above, the electric conductivity exceeds 90% IACS, the heat conductivity can reach 350 W / (m.K) or above, and the alloy has high strength, high electric conductivity and high heat conduction performance. The method is suitable for high-temperature and high-conductivity scenes such as lead frames, resistance welding electrodes and heat sink materials.

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.

This invention discloses a magnesium-doped sodium fluorinated iron phosphate material with a double coating of sodium phosphate and carbon layer, its preparation method, and its application. The magnesium-doped sodium fluorinated iron phosphate material uses Na₂Fe₂O₃ as the substrate. x Mg y The core is composed of PO4F, coated with a sodium phosphate layer, and an outermost conductive carbon layer. Fe has a +2 valence, 0.05 ≤ y ≤ 0.10, and x + y = 1. This invention achieves surface phosphate enrichment through a single ball milling process by adding excess phosphorus and sodium sources. Molten sodium phosphate is then pre-sintered to coat the pre-sintered particles, improving the material's cycle performance. High-temperature sintering achieves carbon coating, enhancing electronic conductivity. This single ball milling and sintering process forms a uniform sodium phosphate and carbon double coating on the material surface, reducing interfacial side reactions between the material and the electrolyte and improving problems such as low discharge capacity and poor rate performance caused by the material's low intrinsic conductivity.

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 application belongs to the field of battery materials, and particularly relates to a kind of conductive nickel phthalocyanine metal organic framework sodium ion battery positive electrode material and its preparation method and application.NiPc-Ni MOF molecular formula is [Ni3(C 32 H 16 N 16 )] n ;NiPc-Ni MOF molecule is in situ deposited on the surface of foam nickel, and is coated on the outer layer of foam nickel matrix, and presents a stacked sub-micron spherical morphology.The application adopts solvothermal, rotary evaporation, extraction and chromatographic column separation method and electrodeposition method to prepare conductive NiPc-Ni MOF@NF positive electrode material, which can be directly used as a positive electrode sheet without adding additional current collector and additives;Phthalocyanine-based MOFs have high intrinsic conductivity, which is conducive to accelerating electron conduction, the porous structure is beneficial to Na + Fast transmission, the formation of extended conjugated structure also greatly improves the stability of the material, and excellent cycle performance and rate performance can be shown.

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 relates to the technical field of electrochemical energy storage, and particularly provides a high-capacity stable manganese-iodine composite material, a preparation method and application thereof, a preparation method of a positive electrode material, a positive plate and a zinc ion battery. The manganese-iodine composite material comprises manganese oxide, iodide and a conductive agent. In order to solve the problem of low intrinsic conductivity of manganese oxide, iodide with high conductivity is introduced, so that the electron conduction capability of the composite material is remarkably improved. The iodide constructs a three-dimensional permeable electron transport network through a rapid oxidation-reduction reaction, so that the electronic conductivity of the composite material is greatly improved. An accurately matched redox potential synergistic system is formed between the iodide and the manganese oxide, a potential relay type synergistic reaction mechanism can be realized by the iodide and the manganese oxide due to an almost overlapped electrochemical window, and the reaction activation energy barrier and the reaction kinetics of Mn < 4 + > / Mn < 3 + > can be effectively reduced. The characteristics jointly construct a high-performance and high-stability aqueous zinc-manganese battery system.

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 present invention relates to a method for preparing a positive electrode material for a polyanion sodium ion battery. The method comprises the following steps: (1) mixing raw materials and a carbon source; (2) spray drying; (3) coating the precursor surface with a sodium supplementation layer; and (4) microwave sintering. The present invention improves the intrinsic conductivity and ion deintercalation rate of the positive electrode material by doping with transition metal elements to replace vanadium sites; improves the electronic conductivity of the positive electrode material by coating with a carbon layer, thereby improving the cycle performance and rate performance of the battery; and coating the surface with a sodium supplementation layer not only reduces side reactions between the positive electrode material and the electrolyte, but also effectively solves the problem of irreversible sodium consumption in sodium ion batteries.

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.

This invention relates to a sodium-ion battery cathode material, its preparation method, and its applications, belonging to the field of secondary battery technology. The core of this cathode material is a two-phase composite of vanadium trioxide and sodium vanadium phosphate-based cathode materials. Vanadium trioxide possesses metal-like properties, and its intrinsic channel structure greatly facilitates ion transport. Therefore, the presence of vanadium trioxide can improve the low intrinsic conductivity of sodium vanadium phosphate-based cathode materials, enhancing their rate performance. Simultaneously, the localized structural distortion and chemical-mechanical coupling at the phase interface of the coexisting two phases accelerate ion and electron diffusion, generating additional electrochemical active sites and mitigating volume expansion, thereby enhancing structural stability. Furthermore, substituting vanadium elements at vanadium sites in the sodium vanadium phosphate-based cathode material with substitution elements mitigates environmental and cost issues caused by the inherent properties of vanadium. Finally, the carbon-based shell enhances the electronic conductivity of the cathode material.

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 invention discloses an anti-corrosion film formed on the surface of metal copper in situ and a preparation method of the anti-corrosion film, and belongs to the technical field of metal material surface treatment and protection engineering. The anti-corrosion film is a coordination polymer of copper ions and thiol compounds, and is formed in situ on the surface of copper through anodic electrochemical deposition. Metal copper is used as a working electrode, a solution containing a thiol compound and a supporting electrolyte is used as an electrolyte, and a three-electrode system is adopted for electrochemical deposition to prepare the electrode. The obtained corrosion-resistant film is compact, uniform and stable, copper can keep excellent stability and protection performance in a chlorine-containing environment and various corrosion environments such as acid, alkaline and high-temperature environments while intrinsic conductivity of copper is not affected, the corrosion-resistant film has corrosion resistance and conductivity, meanwhile, raw materials are low in price and easy to obtain, the process is simple, conditions are mild, and the corrosion-resistant film is suitable for industrial production. The method is suitable for large-scale preparation and has an important application prospect.