34results about How to "Increase working voltage" patented technology

The invention discloses a preparation method and sodium storage application of a sodium-enriched sodium ferric sulfate composite material. The preparation method comprises the following steps: carrying out low-speed ball milling on iron-based sulfate and dispersed CNTs (Carbon Nanotubes), carrying out vacuum drying, carrying out heat treatment, and naturally cooling to room temperature to obtain FeSO4 / CNTs; the preparation method comprises the following steps: mixing FeSO4 / CNTs and anhydrous Na2SO4 according to a molar ratio of Na to Fe of 7: 5.5, carrying out low-speed wet ball milling, carrying out vacuum drying, and grinding to obtain Na2SO4 / FeSO4 / CNTs; and compacting Na2SO4 / FeSO4 / CNTs, placing the Na2SO4 / FeSO4 / CNTs in a tubular furnace, preserving heat at 350-400 DEG C for 10-24 hours, cooling to room temperature, and grinding to obtain the Na7Fe5.5 (SO4) 9 / CNTs composite material. The Na7Fe5.5 (SO4) 9 positive electrode material disclosed by the invention has good sodium storage specific capacity, excellent rate capability and stable long cycle life.

The invention provides a preparation method and application of a high-specific-energy and high-stability manganese-based phosphate positive electrode material, and belongs to the technical field of sodium-ion batteries. Comprising the following steps: 1) preparing a citric acid solution, adding transition metal raw materials, namely a manganese source, a titanium source, a chromium source and a doped metal ion source, into the citric acid solution, and stirring for 20-40 minutes to completely dissolve and fully complex; then adding a sodium source and a phosphorus source, and continuously stirring for 40-60 minutes to obtain a uniform solution; 2) stirring the solution in a hot water bath until gel is formed, then placing the gel in an air dry oven to completely remove the solvent, and grinding to obtain precursor powder; 3, the precursor powder is placed in a tubular furnace, high-temperature calcination is conducted under inert atmosphere protection, and the manganese-based phosphate positive electrode material.The preparation method has the advantages that the preparation process is simple and easy to operate, conditions are controllable, repeatability is good, and the sodium-ion battery positive electrode material shows the characteristics of high energy density and long cycle life and has excellent application prospects.

The invention relates to the technical field of electrochemistry, in particular to a supramolecular ionic liquid gel electrolyte of a solid-state zinc-iodine battery for a high-voltage platform, which is characterized in that free water in hydrogel is replaced by supramolecular interaction between ionic liquid and polyvinyl alcohol molecules to construct a water-poor ionic liquid polymer network; zinc bromide is introduced to serve as an ion carrier in a polymer network through the HofMichael effect, and preparation of the high-voltage solid-state zinc-iodine battery is finally achieved through the chemical coupling effect of bromide ions and iodide ions; the solid electrolyte is prepared from an ionic liquid and a hydrogel solution, imidazole cations of the ionic liquid have a strong electron withdrawing effect, and anions of the ionic liquid are combined with zinc ions and bromide ions to form polyanions. And the ionic liquid is used for replacing water in the hydrogel, so that the ionic liquid gel electrolyte with good chemical stability, mechanical property and electrochemical property is prepared.

This invention relates to the field of semiconductor optoelectronic device technology, specifically to a method and application for reducing the contact resistance of high-Al-content n-AlGaN materials in device manufacturing processes. The method involves surface atom adsorption and annealing of the n-AlGaN layer under a protective gas atmosphere; the atoms are Si and N atoms. This method significantly increases the carrier concentration on the material surface, thereby contributing to excellent ohmic contact performance and reducing the material's contact resistivity. It solves the problem of difficult ohmic contact preparation for high-Al-content n-AlGaN materials, especially the difficulty in forming ohmic contacts after etching. The method is simple and reproducible, effectively avoiding the complexity and instability of existing processes such as acid / alkali corrosion or high-temperature annealing. It ensures large-scale mass production and has no adverse effects on subsequent device fabrication, exhibiting good process compatibility.

The invention discloses an opening and closing mechanism and a control method and device thereof, a storage medium and a household appliance, the opening and closing mechanism comprises an opening and closing clamping plate, the opening and closing clamping plate is opened and closed through a motor, and the control method comprises the following steps: acquiring position information of the opening and closing clamping plate in the closing process of the opening and closing clamping plate; when it is determined that the opening and closing clamping plate is located at a first preset position according to the position information, the working voltage of the motor is controlled to be reduced by a preset voltage threshold value, and whether the motor generates locked-rotor current or not is judged; if the motor generates the locked-rotor current, the motor is controlled to rotate reversely until the opening and closing clamping plate is located at a second preset position, and then the motor is controlled to rotate forwards to close the opening and closing clamping plate; and if the motor does not generate the locked-rotor current and the opening and closing clamping plate is located at a third preset position, the working voltage of the motor is controlled to be increased to a preset voltage threshold value until the opening and closing clamping plate is closed, so that the anti-pinch function of the opening and closing mechanism is achieved, the service life of the opening and closing mechanism is prolonged, the use safety of the opening and closing mechanism is improved, and meanwhile the personal safety of a user is guaranteed.

The utility model provides an insulation structure of a sodium ion battery box, the battery box comprises a battery shell and a cover plate, the cover plate is connected above the battery shell, two battery modules and a protection plate are arranged in the battery shell, each battery module consists of a plurality of rows of battery cell groups, each battery cell group consists of a plurality of battery cells, a first insulation plate is arranged on each surface outside the battery module, and a second insulation plate is arranged on each surface outside the battery module. The plurality of first insulating plates form an insulating shell, so that the battery module is insulated; a protective plate is arranged on one side, close to the cover plate, outside the insulating shell, and a second insulating plate is arranged above the protective plate, so that the protective plate is insulated; a first filling block is arranged between the upper part of the second insulating plate and the battery shell, so that a gap between the second insulating plate and the battery shell is filled, and meanwhile, a buffering effect is achieved; a plurality of second filling blocks are further arranged on the two side edges of the protection plate, the second filling blocks are higher than the protection plate, the upper surfaces of the second filling blocks make contact with the second insulating plate, and the lower surfaces of the second filling blocks make contact with the epoxy shell.

The application discloses a mine-used four-way explosion-proof and intrinsic safety type direct-current power supply with a communication function, which comprises five non-intrinsically safe AC_DC modules and DC intrinsic safety circuits connected with the non-intrinsically safe AC_DC modules, and is recorded as non-intrinsically safe AC_DC module 0-non-intrinsically safe AC_DC module 4. The non-intrinsically safe AC_DC module 0 is responsible for power supply of a power management module. Two power supplies of the non-intrinsically safe AC_DC module 1 and the non-intrinsically safe AC_DC module 2 are converged through the power management module to form a double-path power supply A. Two power supplies of the non-intrinsically safe AC_DC module 3 and the non-intrinsically safe AC_DC module 4 are converged through the power management module to form a double-path power supply B. The double-path power supply A is fused with a CAN bus and a vehicle-mounted Ethernet unit into an 8-core composite cable. The double-path power supply B is fused with another CAN bus and the vehicle-mounted Ethernet unit into an 8-core composite cable. The power supply internally adopts a four-way power supply parallel mode, can realize power supply with a larger power, has a higher power conversion efficiency, has a lower heat generation, and improves the safety of the power supply system.

The invention discloses a light-emitting element, and the element comprises an LED chip which is provided with a first surface, a second surface opposite to the first surface, and a side wall connected with the first surface and the second surface. The wavelength conversion layer is at least arranged on the first surface of the LED chip; the electrode expansion structure is arranged on the second surface of the LED chip; the packaging layer at least surrounds the LED chip, the wavelength conversion layer and the electrode expansion structure; and at least one functional structure module selected from the group consisting of the following structure modules. The method can flexibly adapt to different application scenes.

The utility model relates to the technical field of extrusion forming machines, and particularly discloses a ceramic powder hot extrusion automatic forming machine which comprises a forming machine body, a raw material box is fixedly connected to one side of the top of the forming machine body, and a nitrogen preparation circulating system is fixedly connected to one side of the inner bottom wall of the forming machine body. A nitrogen pressure detection system is arranged on one side of the nitrogen preparation circulating system and one side of the inner bottom wall of the forming machine main body, and a reciprocating filling system is fixedly connected to the other side of the top of the forming machine main body; according to the utility model, nitrogen is charged through intelligent control equipment to form positive pressure on a working surface to isolate air instead of vacuumizing, a prepared finished product is automatically cooled, and after raw materials are filled, one-key starting and full-automatic production are realized, so that manual operation and manufacturing procedures are reduced, the working voltage of an electric heating body is improved by the manufactured ceramic tube, and the production efficiency is improved. And the power distribution cost is reduced, so that the effect of integrally and automatically manufacturing the ceramic tube is achieved, and the manufacturing efficiency is conveniently improved.

The invention discloses a sodium manganese ferric phosphate pyrophosphate positive electrode material and a preparation method and application thereof. The chemical formula of the sodium ion positive electrode material is Na3 (Mn0. 8Fe0. 2) 2 (PO4) (P2O7), the sodium ion positive electrode material is of a regular nanosheet structure, the particle size is 2 microns, and the compaction density is 2.3-2.5 g / cm < 3 >. According to the method, the ferromanganese source precursor is synthesized under the assistance of a sol-gel method and freeze drying, various conditions in the reaction process are easy to control, and the repeatability of the product is relatively good. The sodium manganese ferric phosphate pyrophosphate positive electrode material synthesized by the method is nanoparticles which are uniformly distributed; and when being used as the positive electrode material of the sodium ion battery, the material has the advantages of good air stability, high working voltage (3.4 V), good rate capability and stable cycle stability.

The invention discloses an alternating copolymer, and belongs to the technical field of lithium battery materials, a molecular main chain of the alternating copolymer is formed by rigid fragments and flexible fragments in an alternating manner, the rigid fragments contain rigid benzene ring structures and ferrocene structures, and the flexible fragments are ethyl structures. The invention also discloses a synthesis method of the alternating copolymer and an application of the alternating copolymer in a lithium battery positive electrode material. The alternating copolymer not only contains a rigid conjugated structure beneficial to electron transmission, but also has a flexible twisted structure beneficial to rapid ion transmission, the defects of a full-rigid chain segment or a full-flexible chain segment are effectively avoided through the rigid-flexible structural design, and meanwhile, the alternating copolymer has the advantages of the rigid conjugated structure and the flexible twisted structure; according to the present invention, the material has the rapid electron and ion transmission performance under the condition of no damage to the electrode energy density, and can provide excellent rate performance, high specific capacity and good long cycle performance when the material is adopted as the lithium battery positive electrode.

The invention discloses a radio frequency power supply circuit and electronic equipment. The radio frequency power supply circuit comprises a power supply module, a first inductor, a power tube, a peak value detection module and a control module. The first end of the first inductor is connected with the power module; the first end of the power tube is connected with the second end of the first inductor and coupled with a load, the second end of the power tube is grounded, and the control end of the power tube is configured to input a radio frequency signal; the peak detection module is connected with the first end of the power tube, and the peak detection module is configured to obtain the peak voltage of the first end of the power tube; the control module is connected with the peak value detection module and the power supply module, and the control module is configured to control the power supply module to reduce the output voltage when the peak value voltage is larger than a first voltage threshold value. Through the above mode, the mismatch risk of the power tube can be effectively reduced, and the overvoltage protection of the power tube can be realized.

The invention discloses an epitaxial structure, an LED chip and a manufacturing method thereof, the epitaxial structure comprises N stacked light-emitting units and tunnel junctions located between two adjacent light-emitting units, N is greater than or equal to 2, and N is a positive integer; the light-emitting unit comprises a first type waveguide layer, an active layer and a second type waveguide layer; the tunnel junction comprises a first type material layer and a second type material layer which are stacked; the forbidden bandwidths of the first type doping layer and the second type doping layer of the tunnel junction in the light emitting direction are not changed or are gradually increased; the array substrate further comprises a plurality of first-type reflecting layers; the first type reflection layer is laminated on the surface, facing the first type waveguide layer, of each tunnel junction; or the first type reflection layer is laminated on the surface, deviating from the active layer, of each first type waveguide layer. The epitaxial structure is combined with a plurality of light-emitting units through tunnel junctions to form a multi-junction structure, so that the working voltage is effectively improved. And moreover, the occupied area is small, and the epitaxial area loss is reduced. Through the arrangement of the forbidden band width of the tunnel junction, the top light absorption from the epitaxial structure along the light emitting direction is reduced, and the higher light emitting efficiency is ensured.

The present application relates to an electroluminescent device comprising a compound of formula (I) and a compound of formula (II) and a display device comprising said organic electroluminescent device.

The invention relates to an integrated circuit (IC) device, a voltage regulating method, a power supply system and electronic equipment. A first input end (101) of the IC device (10) is used for being connected with a power supply input end (203) of the host (20), a voltage output end (102) of the IC device (10) is used for being connected with a first voltage feedback end (3015) of a first power module (301) in the first slave (30), and the first power module is used for supplying power to the host. Wherein the IC device is used for obtaining a power supply voltage of a host through a first input end; obtaining a first feedback voltage according to first voltage regulation data configured by the host and the power supply voltage of the host; and outputting the first feedback voltage to the first voltage feedback end through the voltage output end, so that the first power supply module adjusts the output voltage of the first power supply module according to the first feedback voltage. According to the scheme, the output voltage of the power supply module can be changed, so that the power supply voltage of the host is adjusted, and the working voltage of the chip can be optimized according to the design of an actual product.

The invention provides a dielectric body insulation-based high-voltage low-inductance perforation connection assembly and a perforation connection structure, which are used for solving the technical problem that the transmission efficiency of voltage pulses is restricted due to the defects of large size, loose structure, high inductance and the like of the existing perforation connection assembly. According to the perforated connection assembly based on dielectric body insulation provided by the invention, a double-shielding structure design of the connection shielding body and the perforated shielding body is adopted, and the outer contour size of the perforated shielding body is smaller than that of the connection shielding body; an insulation space problem along the current horizontal transmission direction of the connection structure is converted into a vertical scale space problem; meanwhile, the portions, corresponding to the connecting structures, of the two angular transmission lines to be connected form a connecting shielding body through the sunken connecting grooves, the size space requirement in the horizontal direction is lowered to the maximum extent, and the connector has the advantages of being simple in structure, high in working voltage and the like.

The application discloses an encoder power supply switching circuit, which is characterized by comprising a first switching circuit, a second switching circuit and a power output end, wherein the power output end is used for connecting an encoder load, the first switching circuit is arranged between an encoder power supply and the power output end, the first switching circuit comprises a first diode, the positive electrode of the first diode is connected with the encoder power supply, and the negative electrode of the first diode is connected with the power output end; the second switching circuit is arranged between an encoder battery and the power output end, the second switching circuit comprises a first Pmos tube, the drain electrode of the first Pmos tube is connected with the encoder battery, the source electrode of the first Pmos tube is connected with the power output end, and the gate electrode of the first Pmos tube is connected with the encoder power supply. The application has the advantages that the automatic switching of the power supply of the encoder is realized, the problem of power supply voltage drop is solved, and the power supply switching circuit has a smaller voltage drop.

This invention relates to a wide-temperature-range ether-based electrolyte with a customized high-voltage-resistant interface layer in alkali metal batteries, its preparation method, and its application. The wide-temperature-range ether-based electrolyte comprises a base electrolyte, an anion acceptor additive, and an anion additive containing a specific elemental alkali metal salt. The base electrolyte comprises an alkali metal salt and an ether solvent. In the wide-temperature-range ether-based electrolyte, the concentration of the alkali metal salt is 0.1–1.5 mol·L⁻¹. ‑1 The concentration of the anion acceptor additive is 0.5~5wt%, and the concentration of the alkali metal salt anion additive containing specific elements is 0.1~5wt%. Compared with the prior art, the CEI layer in the wide-temperature-range ether electrolyte of the present invention is more dense and exhibits enhanced chemical and thermal stability, effectively suppressing the positive electrode oxidation reaction and alleviating ion transport limitation, improving the high-temperature, room-temperature, and low-temperature cycle performance of the battery, and increasing the battery's service life.

The invention provides a lithium ion battery. The lithium ion battery comprises a positive plate, a negative plate, electrolyte and a diaphragm, wherein the positive plate comprises a positive active material, the positive active material comprises an O2-phase cobalt oxide layered oxide, the electrolyte comprises a boron compound, and the boron compound comprises one or more of compounds as shown in a formula I, a formula II, a formula III and a formula IV. The boron compound and the cobalt oxide layered oxide cooperate with each other, so that the lithium ion battery has relatively high energy density, capacity and cycle performance in a high-voltage environment.

The application discloses a kind of solid electrolyte and preparation method thereof, polymer composite solid electrolyte and solid lithium battery, belong to solid lithium battery technical field, solid electrolyte includes lithium-containing transition metal oxide and doped element doped in lithium-containing transition metal oxide;The chemical formula of the solid electrolyte is Li x M (1‑y) N y O z ;Wherein, M is any one of transition metal, and the transition metal includes any one of Co, Ni or Mn, N is any one or more of doped element, x>0, 0.001≤y≤0.5, z>0.The solid electrolyte provided by the application has high ionic conductivity, controllable electronic conductivity, good interface compatibility, strong environmental stability and low cost, and is suitable for existing solid lithium battery system.

The utility model discloses a module combined power lithium cell module and battery pack, including first backboard, second backplate and battery assembly, and battery assembly includes positive terminal piece, negative terminal piece and electric core unit, and electric core unit is located between positive terminal piece and negative terminal piece, and positive terminal piece and negative terminal piece include electrode assembly, and electrode assembly includes electrode plate and pole, and electrode plate includes first connecting part and second connecting part, and first connecting part and second connecting part are bent and connected in right angle, and first connecting part is connected with electric core unit, and pole is connected on second connecting part, and the positive pole of electric core unit is electrically connected with positive terminal piece, and the negative pole of electric core unit is electrically connected with negative terminal piece, and the both sides of positive terminal piece are connected with first backplate and second backplate respectively, and the both sides of negative terminal piece are connected with first backplate and second backplate respectively. Therefore, the utility model is assembled through the pre-modularized component, can reduce the difficulty of assembly on one hand, promotes the efficiency when assembling.

The invention discloses an arc extinguishing system and an electric appliance switch thereof, and belongs to the technical field of electric appliance equipment, the arc extinguishing system comprises a front arc extinguishing grid plate group and a rear arc extinguishing grid plate group which are connected in parallel, and the front arc extinguishing grid plate group is connected with a static arc striking grid plate and a movable arc striking grid plate; when one rear arc extinguishing grid plate group is arranged, two ends of the rear arc extinguishing grid plate group are respectively connected with the static arc striking grid plate and the movable arc striking grid plate, and when multiple rear arc extinguishing grid plate groups are arranged, one end of the first group is connected with the static arc striking grid plate, and one end of the second group is connected with the movable arc striking grid plate; when a plurality of groups of rear arc extinguishing grid sheet groups are arranged, the arc extinguishing grid sheet structure also comprises arc striking grid sheet groups, the front ends of the arc striking grid sheet groups are attached and inserted among the arc extinguishing grid sheets of the front arc extinguishing grid sheet group, the rear ends of the arc striking grid sheet groups are respectively connected with the end parts of different rear arc extinguishing grid sheet groups, and the different rear arc extinguishing grid sheet groups are connected in series through the arc striking grid sheet groups. According to the invention, the intervention time of the arc extinguishing grid sheets can be shortened, the initial arc energy is greatly reduced, the duration of the metal phase arc is reduced, the number of the arc extinguishing grid sheets can be increased, and the breaking capacity and the electrical life of the electric appliance switch are greatly improved.

The invention discloses a control circuit for quick closing of a relay and an implementation method thereof, and relates to the technical field of relay control circuits, the control circuit comprises a relay S1, a diode D1, voltage stabilizing diodes D2 and D3, triodes Q1 and Q2, an energy storage capacitor C1, and resistors R1, R2, R3, R4 and R5, a point 3 and a point 4 of the S1 are connected to two ends of a load; a point 1 of the S1 is simultaneously connected with a negative electrode of the D1 and a positive electrode of the C1, the positive electrode of the D1 is connected with a 12V power supply, a negative electrode of the C1 is grounded through the R1 and is simultaneously connected with a collector electrode of the Q1, and a base electrode of the Q1 and an emitter electrode are jointly connected with the 12V power supply through the R2 and the R3 which are connected in series; a point 2 of the S1 is grounded through D3 and is connected with a collector electrode of Q2, a base electrode of the Q2 is connected with a trigger signal through R4, and an emitter electrode of the Q2 is grounded; the collector electrode of Q2 is also connected with the cathode of D2, and the anode of D2 is connected with a 12V power supply through R5 and R3 which are connected in series. By changing the trigger signal, the working voltage of the coil can be increased at the moment that the relay is connected, and the coil recovers to the normal working voltage after the contact is closed.

The embodiment of the present invention discloses a chip design method and device, which relates to the field of computer technology and can effectively improve the performance of a chip after aging. The method includes: obtaining unit constraints of a pending unit in a chip, wherein the unit constraints include factory performance constraints, factory energy consumption constraints, aging performance constraints, and aging energy consumption constraints of the pending unit; according to the unit constraints, selecting a target unit in a standard cell library corresponding to the pending unit as the pending unit, wherein the factory performance parameters, factory energy consumption parameters, aging performance parameters, and aging energy consumption parameters of the target unit all meet the corresponding unit constraints, and the target unit is the standard unit with the lowest aging energy consumption parameter among all standard units in the standard cell library that meet the unit constraints. The present invention is applicable to chip design.

One embodiment discloses a semiconductor device, including: a semiconductor structure, the semiconductor structure including a first conductive semiconductor layer, a second conductive semiconductor layer and an active layer arranged between the first conductive semiconductor layer and the second conductive semiconductor layer and including a plurality of first recesses and a second recess, the plurality of first recesses being arranged to penetrate the second conductive semiconductor layer and the active layer to a partial area of ​​the first conductive semiconductor layer, the second recess being arranged between the plurality of first recesses; a plurality of first electrodes being arranged in the plurality of first recesses and electrically connected to the first conductive semiconductor layer; a plurality of second electrodes being electrically connected to the second conductive semiconductor layer; and a reflective layer being arranged in the second recess, wherein the sum of the areas of the plurality of first recesses and the areas of the second recesses is 60% or less of the maximum area in a first direction of the semiconductor structure, the areas of the plurality of first recesses and the areas of the second recesses are areas formed on a lower surface of the semiconductor structure, and the first direction is perpendicular to a thickness direction of the semiconductor structure.

This invention belongs to the field of electrochemical power source technology, and relates to a multi-metal ion-substituted V site M x V₂O₅ materials, their preparation methods, and applications. The preparation steps are as follows: Citric acid monohydrate, anhydrous oxalic acid, and ammonium metavanadate are sequentially added to deionized water and stirred until completely dissolved to obtain a first solution; citric acid monohydrate and a salt containing metal cation M are added to deionized water and stirred until the salt containing metal cation M is completely dissolved to obtain a second solution; the two solutions are mixed evenly and reacted under a preset temperature to form a gel-like product; the gel-like product is dried to obtain a precursor dry gel; then, after grinding and high-temperature annealing, M is obtained. x V₂O₅ material. The M x When V2O5 is used as a cathode material for lithium-ion secondary batteries, it exhibits excellent reversible capacity and cycle stability, and eliminates the problems of voltage drop and poor cycle stability of traditional V2O5 during discharge.

The application discloses a positive electrode of a dual-ion battery, a battery, and a preparation method and application thereof. The dual-ion battery comprises a positive electrode, and the positive electrode comprises a positive electrode material layer, wherein the positive electrode material layer comprises a polymer generated by in-situ electro-polymerization reaction of an active material; and the active material is selected from carbazole and / or carbazole derivatives. In the application, the active material in the positive electrode undergoes in-situ electro-polymerization reaction during charging, and is converted from a small molecule into a polymer, thereby reducing the solubility in an electrolyte, improving the energy storage stability of the positive electrode, and enabling the dual-ion battery containing the positive electrode to have excellent specific capacity and cycle stability. In the application, the positive electrode and the negative electrode of the dual-ion battery store anions and cations, respectively, during operation. The embedding and de-embedding of large-size anions (bisfluorosulfonylimide ions / bistrifluoromethanesulfonylimide ions) enable the battery to have a high working voltage, excellent specific capacity and cycle stability.

This invention discloses a method for preparing a high-entropy sodium ferrous sulfate / carbon composite cathode material and its application in high-temperature sodium-ion batteries, belonging to the technical field of sodium-ion battery cathode materials. The general formula of the sodium ferrous sulfate / carbon composite cathode material is Na. 2.4‑ 2a Fe 1.8‑x+a M 2+ y N 3+ z (SO4)3 / C, where 2x = 2y + 3z, 0 ≤ a ≤ 0.2, 0 < x ≤ 0.2, 0.01 ≤ y ≤ 0.1, 0.01 ≤ z ≤ 0.1; M is selected from at least four of Mg, Ca, Mn, Co, Ni, Cu, Zn, and Ba, and N is selected from Al or Cr. This invention utilizes a high configurational entropy to suppress the dissolution of transition metals, structural collapse, and abnormal grain growth under high-temperature conditions, enabling the material to maintain structural integrity and performance stability during high-temperature cycling, thus possessing broad application prospects.

The invention belongs to the field of batteries, and specifically discloses a double-doped sodium iron sulfate positive electrode material and a preparation method and application thereof; the positive electrode material comprises a doped sodium iron sulfate material; the chemical formula of the doped sodium iron sulfate material is Na 2+a Fe 2‑b‑c TM c (SO4) 3‑d (SeO4) d , wherein TM includes at least one of cobalt and nickel. The positive electrode material of the present invention uses Se and TM (such as cobalt and / or nickel) to simultaneously dope sodium iron sulfate material, which significantly improves the conductivity, stability and rate performance of the positive electrode material. The battery assembled with the positive electrode material prepared by the present invention obtains a higher operating voltage, and obtains a relatively excellent discharge specific capacity and cycle performance at room temperature and high and low temperatures.