34results about How to "Avoid volume" patented technology

This utility model discloses an integrated noise reduction component for energy storage cabinets, including an exhaust noise reduction duct and a cabinet door. The exhaust noise reduction duct is connected to the cabinet door, which includes an outer frame and a door frame. The outer frame is fixed to the energy storage cabinet body, and the door frame is connected to the inner side of the outer frame via hinges. A crossbeam is connected to the middle of the door frame, and a connection hole is formed between the upper end of the door frame and the crossbeam. A sealing plate is connected between the lower end of the door frame and the crossbeam. The connection hole communicates with the air inlet of the exhaust noise reduction duct. Multiple parallel sound-absorbing panels are installed inside the exhaust noise reduction duct. This utility model solves the problems of high noise, large size, and difficult maintenance of existing energy storage cabinets. By connecting the exhaust noise reduction duct to the cabinet door, the exhaust noise reduction duct does not affect the internal layout of the cabinet, and the opening of the cabinet door facilitates maintenance of the cabinet interior.

The application discloses a kind of coronary angiography three-dimensional reconstruction method and system, it is related to medical image processing technical field, including: obtaining multi-angle coronary DSA angiography projection image and executing pre-processing, extract blood vessel initial center line and both sides initial contour, calculate each section contrast agent relative concentration, combined with blood vessel local curvature, concentration difference sign change and anatomical feature adaptive segmentation blood vessel section, filter reliable reference side and generate mirror virtual contour, calculate three kinds of contour deviation, construct multi-constraint objective function and correct center line section by section, integrate corrected center line and fit lumen parameter, solve blood vessel feature point three-dimensional coordinate and complete three-dimensional reconstruction.The application has the advantages that: effectively suppress the center line deviation caused by contrast agent concentration uneven, consider correction accuracy and blood vessel form continuity, the size of three-dimensional model output is accurate, topological correct, can be directly used for clinical quantitative diagnosis and interventional operation planning.

The application discloses a low-vibration active phase modulation composite pulse tube Stirling cryogenic refrigerator and belongs to the technical field of cryogenic refrigerators. The composite refrigerator cold finger integrates a first Stirling component as a high-temperature stage and a second pulse tube component as a low-temperature stage. The innovation is that the phase modulation unit of the second pulse tube component is composed of a second inertia tube wound and fixed in the inner circle of the gas reservoir, and the gas reservoir is integrally connected to the first cold end heat exchanger to improve the system efficiency through low-temperature arrangement. At the same time, the motion state of the compressor piston and the first displacer is monitored and cooperatively controlled in real time through the compressor displacement sensor and the cold finger displacement sensor, active and accurate phase modulation is realized, and the active vibration damper is used to perform reverse compensation according to the motion feedback of the first displacer to significantly offset the vibration output of the whole machine. The application realizes the unity of high efficiency, low vibration and high reliability, and is particularly suitable for vibration-sensitive space exploration and other application scenarios.

This invention discloses a coupling and separation network for composite signal transmission, relating to the field of composite signal transmission. The coupling and separation network includes: a boost module for boosting an AC drive signal; a drive transmission module for transmitting the boosted AC drive signal and outputting it to a parallel resonant module via a cable; and a parallel resonant module for ensuring that the voltage and current on the coaxial cable are in phase. The boost module is connected to the drive transmission module, which in turn is connected to both the parallel resonant module and the boost module. This coupling and separation network drives three types of signals. Compared with existing technologies, the advantages of this invention are: it avoids the problems of relay mechanical reliability and transient interference caused by switching during composite signal transmission, and it utilizes a transducer-matched inductor to achieve high-voltage, high-power, low-frequency signal filtering, avoiding the size and weight costs associated with additional components.

The present application relates to the field of high polymer bonding method, and discloses a kind of in-situ bonding method of decorative film layer and soft glue base material, comprising: the decorative layer with latent reaction layer in back is placed in situ interface reaction field;Initial high polymer bonding matrix is introduced and maintained non-isothermal enthalpy relaxation state to retain free chain segment kinetic activity;Chemical potential gradient is used to induce component migration to interface and form enrichment layer;Secondary heat pulse is applied to induce reaction group and latent reaction layer to covalently bond to construct interpenetrating network;Secondary high polymer bonding matrix is introduced to drive chain segment penetration using hydrostatic pressure, the present application realizes interface chemical reconfiguration by component directional migration, eliminates thermodynamic repulsion effect, changes interface failure mode into bulk cohesive failure, and enhances stability under severe working conditions.

The invention relates to the technical field of craniocerebral injury biomechanical analysis, discloses a semi-automatic craniocerebral injury index CSDM extraction method, and aims to improve CSDM extraction efficiency, applicability and flexibility. The method comprises the following steps: a brain tissue area display state pre-selection step: importing a head model simulation result file into post-processing software, screening and retaining brain tissue entity unit components, hiding irrelevant components and recording parameters; a strain and volume frame-by-frame output step: compiling an automatic script based on a post-processing software secondary development function to realize frame-by-frame output of unit data; and an automatic operation step: automatically calculating the CSDM value of each frame based on the output file through a Matlab calculation program. According to the method, the problems that manual extraction is low in efficiency and prone to errors and a full-automatic method is poor in universality are solved through a manual preprocessing and automatic calculation fusion mode, and the method is suitable for various head models and supports craniocerebral injury mechanism research and clinical assistance.

This invention provides an electronic card cooling device with a multi-dimensional extended structure. Through a collaborative design of a two-dimensional planar array and a three-dimensional cascade, it significantly increases the effective working volume of the electronic card material within a limited space, thus laying the structural foundation for improved cooling capacity. Based on this, the cooperation between the magnetic drive unit and the mechanical linkage module enables stable and rapid reciprocating motion of the electronic card components between the hot and cold ends. Furthermore, the timing delay control of the circuit control system further ensures precise synchronization between the temperature change cycle of the electronic card effect and the mechanical motion cycle, allowing the electronic card material to absorb heat when in contact with the hot end and release heat when in contact with the cold end, avoiding energy loss. This invention, by simultaneously expanding the number of electronic card materials and components in two-dimensional and three-dimensional space, achieves a spatial dimension multiplication of cooling capacity, maximizing the cooling effect in space-constrained scenarios, and providing an effective solution to overcome the bottlenecks of existing electronic card cooling technologies.

The application relates to a flexible charging module control method and device supporting V2G, comprising the following steps: determining whether there is a hard switching risk according to the comparison result of the load power value and the preset threshold value; in the case that there is a hard switching risk, adjusting the resonant frequency of the CLLL topology to the first frequency interval based on a frequency-duty cycle hybrid modulation strategy, making the resonant current phase and the switch tube voltage phase form a preset phase difference, and adjusting the drive signal duty cycle of the primary side switch tube and the secondary side switch tube, so that the conduction time difference of the primary side switch tube and the secondary side switch tube increases with the decrease of the load power value; based on an adaptive frequency spectrum expansion algorithm, the resonant frequency is periodically dithered in the first frequency interval with a preset step, and the dithering period and the switching period of the switch tube are in a nonlinear mapping relationship; the bidirectional power conversion efficiency is improved, the light load hard switching and electromagnetic interference problems are solved, and the reliable operation of the charging module in the V2G scene is ensured.

This invention relates to the field of printing coating preparation technology, and discloses a printable gold coating composition based on resin gold salt. The preparation method includes the following steps: turpentine oil and sulfur powder are stirred and mixed, refluxed at 110-130℃ for 2-4 hours, and after the reaction, the mixture is cooled and filtered to obtain sulfurized balsam, which is stored in the dark for later use; the sulfurized balsam is reacted with chloroauric acid solution to prepare sulfurized balsam gold; a composite resin acid salt additive and a portion of the solvent are ultrasonically premixed, and then the sulfurized balsam gold, a high-molecular organic carrier, and the remaining solvent are added sequentially, stirred, and degassed and aged using a planetary gravity mixer to obtain a printable gold coating composition based on resin gold salt. The obtained gold coating composition possesses good printability, conductivity, surface smoothness, and decorative properties, and is suitable for various coating methods such as screen printing and pad printing, forming a thin and continuous conductive gold film, meeting the industrial preparation requirements of ceramic-based sensor electrodes.

The application discloses an organic-inorganic composite structure for storing metal lithium and a preparation method and application thereof, relates to the technical field of battery materials, and comprises an organic film containing a polymerized ionic liquid and a three-dimensional inorganic frame structure, wherein the organic film is formed by compounding a polymerized ionic liquid, a lithium salt and an organic polymer; the polymerized ionic liquid is formed by photo-polymerization or thermal polymerization of an ionic liquid monomer composed of an imidazole ring cation containing a polymerizable functional group with a carbon-carbon double bond or a triple bond and a functional anion; and the mass ratio of the precursor monomer of the polymerized ionic liquid to the organic polymer is 1:1-1:10. The organic-inorganic composite structure for storing metal lithium and the preparation method and application thereof can provide deposition storage space for metal lithium, effectively inhibit lithium dendrite growth and volume expansion, and improve the internal structure stability and safety in the battery cycle process.

This invention relates to the field of lithium battery technology, and in particular to a method for preparing a lithium-ion battery cell. The invention discloses a method for preparing a lithium-ion battery cell, comprising: first, preparing a positive electrode slurry containing modified titanium aluminum carbide, graphene oxide, etc., and a negative electrode slurry containing aminated carbon nanotubes, zinc aluminum spinel, etc., both processed according to specific proportions and processes; second, coating the positive and negative electrode slurries separately onto a current collector, and obtaining positive and negative electrode sheets through drying, coating with a coating agent, etc.; next, preparing a composite separator coated with a separator coating agent and curing it; finally, winding the separator in a positive-separator-negative-separator sequence, and obtaining a lithium-ion battery cell through drying, encapsulation, electrolyte injection, formation, etc.

A wafer transfer fork arm includes a fork arm body, a support column, and a piston cap. The fork arm body has a main air passage inside, and a chamber is formed on its bearing surface. The support column is disposed within the chamber and has a column air passage communicating with the main air passage. The piston cap is fitted around the outer periphery of the support column, and its sidewall has air holes. The piston cap is configured to move along the support column between an adsorption position and a cleaning position. This application utilizes the air holes on the sidewall of the piston cap, the column air passage of the support column, and the main air passage of the fork arm body to form a single air path. Based on this single air path, cleaning and adsorption operations are achieved by switching between negative and positive pressure, solving the problems of traditional dual-air path solutions.

This invention belongs to the field of environmentally friendly fuel technology, specifically relating to a method for preparing a green, low-carbon, and highly efficient modified fuel for alcohol-hydrogen engines. This invention comprehensively improves fuel performance through a progressive synergistic architecture of a bio-methanol platform – an oxygen-containing combustion-promoting system – a stability barrier – and a low-energy-consumption blending path. Using bio-methanol as a base, it optimizes combustion by compounding with oxygen-containing components such as 2-MTHF and DMM / MF, achieving rapid ignition, emission reduction, and noise reduction. Phase behavior is regulated by isobutanol and polyether-modified silicon, achieving a reversible and stable phase without the need for high-HLB surfactants, preventing deposition and gas lock. A four-fold protective barrier is constructed using GMO and fluorinated silica polyethers, combined with antioxidant synergy to achieve corrosion resistance and aging resistance. The process adopts a sequential design of front-end purification – mid-stage two-phase construction – and end-stage static mixing, achieving low-energy homogenization and ensuring storage, transportation, and operational stability.

The invention belongs to the technical field of lithium ion battery positive electrode materials, and discloses a lithium manganese iron phosphate material with a solid-hollow composite structure and a preparation method thereof.The preparation method adopts a step-by-step reaction and co-sintering method, and comprises the steps that firstly, heterogeneous nucleation is achieved through the solubility product difference of manganese phosphate to form a hollow lithium manganese phosphate precursor; subsequently adding an iron source, a titanium source and other raw materials, and performing spray drying and inert atmosphere sintering to construct a composite structure of solid particles and hollow particles; the lithium manganese iron phosphate material with the solid-hollow composite structure has the characteristics that solid particles provide mechanical support, hollow microspheres increase ion conduction channels and a compact structure formed by a three-dimensional network, and the compaction density gt of a pole piece is realized; 2.5 g / cm < 3 > and 2C rate capacity retention rate gt; and the method has important new energy automobile and large-scale energy storage industrialization application value.

The application discloses a compound based on a PROTAC strategy and a preparation method, a pharmaceutical composition and application thereof, discloses a compound with AR / AR-V7 protein degradation activity and a preparation method, a pharmaceutical composition and application thereof. The structure of the compound is as shown in the formula I. The compound can effectively degrade AR / AR-V7 proteins in vivo and in vitro, has a significant antitumor effect, has no obvious toxic side effects, and can be used for treating castration-resistant prostate cancer. The preparation method of the compound is simple and easy to operate, and is beneficial to structural expansion.

A fluid and solid contact interface simulation method based on flow-solid interface coupling dynamic mesh, the initial mesh of the target geometric model is divided, and the flow field, temperature field and interface evolution driving field are solved according to the initial conditions and boundary conditions, after the theoretical displacement amount of the mesh node in each time step is obtained, based on the interface coupling dynamic mesh (ICDM) method, the local real normal displacement scalar is sequentially executed node state lock protection, equivalent normal projection and parallel synchronous processing; then through the grid node movement, the grid coordinates are updated and the flow field, temperature field and interface evolution driving field are re-solved on the updated grid to obtain a new round of node displacement, and whether the simulation reaches the preset time or the deformation target is judged; finally, the final interface topography, grid node coordinates, grid quality, flow field distribution, temperature field distribution, pressure field distribution and / or heat exchange performance parameters are output. The present application can realize the synchronous iterative update of the deposition behavior and the temperature field and even the flow field, dynamically reflect the influence of deposition on the heat exchange performance, thereby greatly improve the simulation accuracy and physical consistency and be suitable for the subsequent machine learning reverse design of a large number of structure parameters and heat exchange performance samples.

The application discloses a beam-controllable dual-frequency dual-circularly polarized antenna system based on linear polarization regulation. In view of the defects that the existing direct circular polarization reconfigurable unit is complex in design, limited in bandwidth, or the linear polarization regulation needs an external separate polarization converter, resulting in a bulky system, the application adopts a function decoupling architecture: a feed source is used for radiating dual-frequency dual-linear polarization signals; a beam regulation structure independently regulates the phase of the signals keeping the linear polarization state under the control of an electric control module; a polarization conversion structure is arranged on an exit path, and the regulated dual-linear polarization signals are respectively converted into dual-circular polarization signals with opposite rotation directions. In a reflective architecture, the polarization conversion structure and the feed source are spatially coplanar and integrated, eliminating physical obstruction; in a transmissive architecture, the two are stacked. The application retains the advantages of simple design and low cost of the linear polarization unit, and originally obtains dual-frequency dual-circular polarization radiation, and is suitable for reflective and transmissive arrays, and has compact structure and strong architecture versatility.

The invention belongs to the technical field of sodium ion batteries. The invention provides a sodium ion all-solid-state battery positive electrode preparation method, which comprises: S1, coating the surface of chromium-doped sodium nickel manganese oxide with a Na3Al2 (PO4) 3 and sodium dodecyl phosphate composite layer to obtain a modified chromium-doped sodium nickel manganese oxide material; s2, the modified chromium-doped sodium nickel manganese oxide material obtained in the S1, graphite, polyvinylidene fluoride and N-methyl pyrrolidone are mixed according to the mass ratio of 8: (1.4-1.6): (0.75-0.85): (3.8-4.2), and slurry is obtained; and S3, coating an aluminum foil with the slurry obtained in the step S2 to prepare a positive electrode plate, then drying the positive electrode plate, and punching the positive electrode plate into a circle to obtain the sodium ion all-solid-state battery positive electrode with the surface loading capacity of 5.4-6.2 mg / cm < 2 >. According to the invention, the capacity retention ratio of the sodium ion solid-state battery can be effectively improved.

The application discloses a pry-mounted hydrogen mixing ratio detection device for a gas pipeline, which comprises a sampling pipeline, both ends of the sampling pipeline are used for detachable assembly with the gas pipeline, at least one sampling port is arranged on the sampling pipeline, a hoistable support is provided with a containing position, the sampling pipeline is detachably arranged in the containing position, an analyzer is arranged on the hoistable support and connected with the sampling port, a diffusion pipeline is connected with the analyzer, and the diffusion pipeline is also used for being connected with a diffusion point of the gas pipeline. The pry-mounted device is used for integrating and mounting the sampling pipeline, the analyzer and the diffusion pipeline on the hoistable support, and the pry-mounted device can be hoisted to the gas pipeline as a whole, only the two ends of the sampling pipeline need to be connected with the gas pipeline, and the diffusion pipeline needs to be connected with the diffusion point of the gas pipeline, so that the pipeline is shortened, the viscosity and volume delay of gas flowing in the long pipeline are avoided, the data response period is shorter, the on-site workload and construction time are significantly reduced, and the detection precision can be greatly improved.

The application provides a temperature sensor for energy storage battery which is suitable for high temperature and salt conditions, comprising an inner shell, an outer shell, a temperature sensor and two outer leads. The hardness and insulation of the inner shell are higher than those of the outer shell. The temperature sensor for energy storage battery which is suitable for high temperature and salt conditions further comprises a first filling glue and a second filling glue, and the flexibility and stress buffering capacity of the second filling glue are higher than those of the first filling glue. The composite structure of 'rigidity and flexibility' is adopted, that is, the inner shell with high hardness and high insulation forms an internal support and insulation core with the first filling glue to protect the internal structure, and the second filling glue with higher flexibility and stress buffering capacity serves as an intermediate layer to absorb and dissipate mechanical stress and thermal stress from the outer shell, thereby reducing the impact on the internal core. In addition, the outer shell with toughness provides mechanical protection to withstand torsion, impact and external pressure and protect the fragile inner shell and its internal structure.

The invention discloses a binder-free transition metal sulfide composite nitrogen-doped graphene negative electrode material and a preparation method thereof, and belongs to the technical field of secondary battery negative electrode materials. According to the technical scheme, the preparation method comprises the following steps: 1) dissolving zinc nitrate, cobalt nitrate and nitrogen-doped graphene in a mixed solution of ethanol and water, uniformly mixing, adding ammonium fluoride and urea, and continuously stirring; 2) adding foamed nickel and the uniformly mixed solution into a high-pressure reaction kettle for hydrothermal treatment, cooling, washing and drying to obtain a Zn-Co-precursor; (3) calcining the Zn-Co-precursor in an inert atmosphere, and (4) adding the Zn-Co-precursor into a high-pressure reaction kettle containing a sulfur source for hydrothermal vulcanization treatment, washing and drying to obtain the ZnCo2S4-coated NGr / NF negative electrode material.The graphene negative electrode material can improve the overall performance and stability of a secondary battery.

The application discloses a kind of solid hydrogen storage materials and preparation method thereof.The material is dense solid composite, by hydrogen production agent, non-noble metal boride catalyst and composite lithium cobalt oxide carrier is formed by pressure molding, and water can be supplied hydrogen.Hydrogen production agent is based on sodium borohydride or potassium borohydride;The carrier is modified composite lithium cobalt oxide, and has carrier and catalytic function.This application eliminates liquid solvent and porous support structure, builds synergistic catalytic system, to improve mass and volume hydrogen storage density, and ensure stable hydrogen production rate.Preparation method only involves solid phase mechanical mixing and pressing molding, and process is simple, suitable for large-scale production.The material has the characteristics of portable, safe, and can be used as an ideal hydrogen source, applied to hydrogen fuel cell and other fields.

The utility model discloses a sliding leaf lock which comprises a first lock body, a second lock body and a first locking mechanism, the second lock body is hinged to the first lock body, a pivot is located on one side of the second lock body, and the first locking mechanism at least locks closing pivoting of the second lock body between a first state and a second state. The movable sash lock is composed of a single component so as to facilitate installation, and the overall thickness and size are small so as to adapt to narrow-gap installation and use.

This invention discloses a carbon-coated zirconium-doped lithium manganese iron phosphate composite material, its preparation method, and its application, belonging to the field of functional materials technology. The chemical formula of the material is: Li 1‑ 2z Mn x Fe y Zr z PO4 / C; wherein, 0.5≤x≤0.8, 0.15≤y≤0.45, 0.005≤z≤0.05, and satisfying x+y+z=1; its preparation method includes: weighing lithium source, manganese source, iron source, phosphorus source, zirconium source and carbon source according to stoichiometric ratio, mixing them, adding solvent, and dispersing at high speed and grinding to obtain a uniform precursor slurry; after drying, pre-calcining at 300-500℃ for 2-4h under an inert atmosphere, then calcining at 650-750℃ for 6-14h, cooling, crushing and sieving to obtain carbon-coated zirconium-doped manganese iron phosphate; this material, by introducing Zr doping, utilizes its induced charge compensation mechanism and strong covalent bond pillar effect to effectively broaden the one-dimensional diffusion channel of lithium ions, significantly suppressing lattice distortion and manganese ion dissolution during charging and discharging, and obtaining high-rate kinetics and excellent long-cycle stability when used as a positive electrode for lithium-ion batteries.

The utility model discloses a low-thickness and small-size direct-current power converter with a filtering function, which comprises a shell, a cover plate, a direct-current conversion assembly, a filtering anti-interference assembly, a switching printed board and a switching power strip, and is characterized in that the switching printed board is parallel to the cover plate and is arranged between the cover plate and the direct-current conversion assembly; a plurality of contact pins of the direct current conversion assembly are respectively connected with a plurality of corresponding welding holes in the switching printed board in a welding mode, a filtering anti-interference printed board of the filtering anti-interference assembly is perpendicular to the switching printed board and is close to the direct current conversion assembly, and a plurality of L-shaped contact pins are sequentially installed on the switching power strip in the length direction of the switching power strip. One ends of the plurality of L-shaped pins are respectively connected with the plurality of corresponding welding holes on the switching printed board in a welding manner, and the other ends of the plurality of L-shaped pins are respectively connected with the plurality of corresponding welding holes on the filtering anti-interference printed board in a welding manner. According to the utility model, the thickness and the volume of the whole product are reduced, and the electrical industry development requirement of miniaturization of electronic products is met.

This application belongs to the field of battery technology, and particularly relates to silicon-carbon composite materials and their preparation methods, electrodes, and batteries. The method includes: mixing asphalt with potassium hydroxide and dopants uniformly, heating to a first preset temperature, passing a crosslinking agent mixed gas at a first preset flow rate for first activation, cooling to obtain asphalt-based porous carbon; adding the asphalt-based porous carbon to an aldehyde compound solution, then adding a phenolic compound and a catalyst and mixing uniformly, performing a hydrothermal reaction, filtering, and performing a second activation to obtain a hard carbon-coated soft carbon porous carbon composite material; immersing the porous carbon composite material in a liquid silane solution and reacting under closed negative pressure to obtain an intermediate material; heating the asphalt to a molten state, then adding the intermediate material and an organoniobium compound and stirring uniformly to perform carbonization to obtain a silicon-carbon composite material; possessing low expansion, high pore volume, low impedance, and high compaction density, thus improving the electrochemical performance of the battery.

The utility model provides a fixing assembly, a support structure and an energy storage device. The fixing assembly is used for fixing a to-be-fixed part. The fixing assembly comprises a mounting frame, a fixing plate and a fixing piece. The installation frame comprises a guide rail, the guide rail comprises a first face and a second face which are opposite in the first direction, the first face is used for bearing a to-be-fixed part, and the guide rail is provided with an insertion hole penetrating through the first face and the second face. The fixing plate comprises an inserting part and limiting parts which protrude and extend away from the inserting part from the two sides of the inserting part in the second direction, the inserting part penetrates through the inserting hole and is provided with a fixing hole, the fixing hole penetrates through the inserting part in the third direction, in the first direction, the fixing hole is located in the side where the first face is located, and the limiting parts are located in the side where the second face is located; the restricting portion abuts against the second surface of the guide rail. The first direction, the second direction and the third direction are perpendicular to one another in pairs. And the fixing piece is used for penetrating through the fixing hole and a mounting hole in a to-be-fixed piece so as to fixedly connect the inserting part with the to-be-fixed piece.

The present application relates to a negative electrode composition, a negative electrode for a lithium secondary battery comprising the same, and a lithium secondary battery comprising the same.

The application discloses a broadband frequency selective limiting system and a radio frequency device, and relates to the technical field of microwave radio frequency devices. Specifically, the application comprises a first input coupling unit, a first limiting component, a second input coupling unit, a second limiting component and an output synthesis unit. The input end of the second input coupling unit is connected with the first isolation end of the first input coupling unit. The output synthesis unit is electrically connected with the output end of the first limiting component and the output end of the second limiting component. Microwave signals of the first frequency band and the second frequency band are finally uniformly converged by the output synthesis unit. Through the cascading mode of the coupling unit and the limiting component reflection mechanism, the application solves the high insertion loss caused by the equal energy division of the traditional power divider and the large size problem caused by the series filter, greatly reduces the cost, and also expands the effective working bandwidth.

The preparation method comprises the following steps: S1, dissolving a layered oxide positive electrode material, a nitrogen source and a carbon nano tube in a dispersing agent to obtain a first mixed material, dispersing the first mixed material, and uniformly coating the surface of the layered oxide positive electrode material with the nitrogen source and the carbon nano tube to obtain a precursor; and S2, drying the precursor, and calcining to obtain the modified sodium-ion battery positive electrode material, so that the structural stability and the electronic conductivity of the positive electrode material are improved.