1882 results about "Cathode material" patented technology

The invention relates to a method for preparing a lithium iron phosphate / carbon composite material of a lithium ion battery, which belongs to the technical field of lithium ion batteries. The method for preparing the lithium iron phosphate / carbon composite material of the lithium ion battery comprises the following steps of: 1) preparing a suspending graphene-dispersed aqueous solution system, namely, crushing graphite to 1 to 5 microns, adding the crushed graphite into distilled water or purified water, adding 0.1 to 5 percent of surfactant, heating with stirring the mixed solution to 180 to 250 DEG C in a sealing way, performing stirring for 2 to 6 hours and reducing the temperature; 2) crushing lithium iron phosphate to the particle size of 1 to 5 microns, adding the crushed lithium iron phosphate into the distilled water or the purified water, adding with stirring 0.01 to 1 percent of coupling agent, performing uniform stirring, adding the graphene-dispersed aqueous solution, and performing stirring and filtration; and 3) vacuum-drying solid powder obtained by the filtration, and calcinating the dried solid powder for 2 to 12 hours to obtain the graphene-coated lithium iron phosphate cathode material. The method has the advantages of simple process, high material performance, high conductivity, high bulk density, high compacted density and the like.

The invention discloses a high-voltage single-crystal positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps: by taking MOFs (Metal Organic Frameworks) with a porous structure as a template, loading a ternary precursor in pore channels of the template by adopting a solvothermal method to prepare loaded MOFs; mixing the loaded MOFs with a lithium source, carbonizing and calcining in an inert atmosphere for high-temperature solid-phase reaction, carbonizing the template to form a nitrogen-doped porous carbon skeleton, and converting the ternary precursor into single-crystal NCM particles to prepare a calcined product; sequentially carrying out acid pickling, drying and airflow crushing treatment on the calcined product to obtain a composite material; the composite material is sequentially subjected to multi-section penetration type dry coating and sintering treatment, the high-voltage single-crystal positive electrode material is prepared, and the high-voltage single-crystal positive electrode material can balance the capacity, the cycle life and the safety under high voltage.

The invention discloses a battery positive electrode material particle automatic analysis method and system. The method comprises the following steps: inputting an SEM image into a deep learning model, carrying out instance segmentation on particles to obtain a particle contour area, carrying out multi-dimensional quantitative analysis, and extracting geometric and optical quantitative indexes of a particle contour; according to the geometric and optical quantitative indexes of the particle contour, particle quantitative index statistical characteristics are generated, the geometric and optical quantitative indexes and the statistical characteristics are input into a large language model for particle characteristic analysis, and an analysis report is generated. The method and the system can effectively solve the automation problem of particle identification and characteristic analysis in the SEM image, comprehensive particle characteristic data can be obtained without manual intervention, and the system is mainly used for high-precision quantitative analysis of morphological characteristics, size distribution and morphological parameters of battery positive electrode material particles. And key microstructure data support is provided for research and development, quality control and performance optimization of the positive electrode material of the lithium ion battery.

The application provides a coated layered oxide sodium ion battery positive electrode material with excellent cycle stability, the positive electrode material is coated with nano-aluminum oxide and nano-titanium oxide on the surface of Na 0.66 Ni 0.23 Cu 0.1 Mn 0.67 O2 material. The positive electrode material provided by the application exhibits excellent long cycle stability and has a wide commercial development prospect.

The invention discloses a sodium ion battery positive electrode material as well as a precursor, a preparation method and application thereof. The chemical formula of the sodium ion battery positive electrode material precursor is NiaFebMncCudZeMef (OH) 2, wherein 0 < = a < = 0.4, 0 < = b < = 0.5, 0 < = c < = 0.6, 0 < = d < = 0.15, and 0 < = ilt; 0.15, 0 < = f < = 0.05, (a + b + c + d + e + f) = 1, and Me is selected from one or more than two of Ce, Nb, Ta, La, Mo and W; and the content of Me in the precursor of the positive electrode material of the sodium-ion battery is linearly increased along the direction from the body center to the surface of the precursor material. According to the invention, the content of the final doping element is linearly increased from the inside of the particle to the outside by controlling the speed of introducing the nickel source, the manganese source, the iron source, the copper source, the zinc source and the Me source into the reaction kettle in each period of time and the reaction time of each system. The precursor and a sodium source in a proper proportion are uniformly mixed and sintered to obtain the gradient-doped sodium ion battery positive electrode material, and the positive electrode material has good cycle performance, rate capability and relatively high reversible specific capacity.

The invention provides a lithium nickel manganese oxide positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment, and relates to the field of lithium ion batteries. Comprising an inner core and a coating layer, the chemical general formula of the inner core is Li Ni < x > Mn < y > M < z > M'wO < 4 >; m comprises one or more of Al, Mg, Co, Mn, Ni, Ti, Zr, W, Nb, P, Sb, F, Sr and Se; m'comprises one or more of Mg, Co, Mn, Ni, Ti, Zr, W, Nb, P, Sb, F, Sr and Se; the coating layer comprises a LiM ''O-type fast ion conductor, and M'' comprises one or more of Mg, Al, Co, Mn, Ni, Ti, Zr, W, Nb, Sb, La and Se. According to the lithium nickel manganese oxide positive electrode material, M and M'are cooperatively doped, and then fast ion conductor coating is performed, so that the ion conductivity of the positive electrode material and the structural stability of the material under high voltage are remarkably improved.

Some embodiments are directed to systems and methods for direct recycling of batteries. In one aspect, a method includes obtaining spent cathode materials from spent batteries. The method includes wet milling the spent cathode materials in an aqueous medium to obtain deagglomerated particles. The method includes spray drying the deagglomerated particles to obtain a plurality of clusters of particles. The method further includes annealing the plurality of clusters of particles in a gaseous environment to obtain a plurality of single particles.

The invention discloses a long-life lithium manganese iron phosphate positive electrode material and a preparation method thereof, and relates to the technical field of lithium ion battery positive electrode materials. The long-life lithium manganese iron phosphate positive electrode material comprises lithium manganese iron phosphate, a middle coating layer and a carbon coating layer, the surface of the lithium manganese iron phosphate is coated with the middle coating layer, the surface of the middle coating layer is coated with the carbon coating layer, the middle coating layer contains metal fluoride and aluminum-containing sinter, and the aluminum-containing sinter comprises aluminum oxide and lithium metaaluminate. The synergistic coating of the middle coating layer and the carbon coating layer can effectively reduce the contact between the positive electrode material and an electrolyte, inhibit the generation of surface side reactions, improve the stability of the electrode material structure, and have low manganese dissolution and excellent cycle life.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a device and a method for quickly removing refractory organic pollutants by utilizing photoelectric synergy and modified foam zero-valent iron to synchronously catalyze ozone. According to the technical scheme, the device comprises a shell, the interior of the shell is divided into an anode chamber and a cathode chamber through a proton exchange membrane, the shell is provided with a water inlet communicated with the anode chamber and a water outlet communicated with the cathode chamber, and the water inlet is communicated with the anode chamber and the water outlet is communicated with the cathode chamber. An anode material and an LED array are arranged in the anode chamber, a cathode material is arranged in the cathode chamber, and the cathode chamber is further filled with a modified foam zero-valent iron catalyst. The invention provides a device and a method for rapidly removing refractory organic pollutants by utilizing photoelectric synergy and modified foam zero-valent iron to synchronously catalyze ozone.

The invention discloses a niobium-doped and carbon nanotube continuously coated lithium iron nickel phosphate material and a preparation method thereof, and belongs to the technical field of lithium ion battery positive electrode materials. The niobium source and the phosphorus source are added step by step, the concentration gradient distribution of the niobium element in the material is realized, and niobium is preferentially doped in the [100] crystal orientation through three-section temperature control sintering, so that the bulk phase conductivity and the lithium ion mobility are remarkably improved, and the capacity loss caused by excessive doping is avoided while the lattice structure is stabilized. In addition, the carbon nanotubes and the nitrogen-containing carbon source have a synergistic effect, Li-N-C covalent bonds are formed on the surface of the material, the interface stability is enhanced, the interface side reaction is effectively inhibited, and the surface conductivity is improved. According to the method, through double modification of doping and coating, the problems of low conductivity and poor cycling stability of the lithium iron nickel phosphate material are successfully solved, and the final product shows excellent rate capability and long cycle life.

The invention discloses a multi-element differentiated distribution co-doped single-crystal high-nickel positive electrode material and a preparation method and application thereof.The material is doped with a first doping element and a second doping element, the first doping element is in gradient distribution with the concentration gradually increased from inside to outside in material particles, and the second doping element is in gradient distribution with the concentration gradually increased from inside to outside. The second doping elements are basically and uniformly distributed in the material particles; the first doping element is used for strengthening the surface stability of the material, and the second doping element is used for stabilizing the bulk phase structure of the material. The material is obtained by taking a lithium salt and a ternary positive electrode material precursor as raw materials, introducing a first doping source and a second doping source, mixing, ball-milling and calcining according to a preset stoichiometric ratio.

The invention belongs to the field of positive electrode materials, and particularly relates to a core-shell ferromanganese phosphate precursor, a modified lithium ferric manganese phosphate material, a preparation method and application of the modified lithium ferric manganese phosphate material and a lithium ion battery. The core-shell ferromanganese phosphate precursor comprises a core and a shell wrapping the core, and the core is Fe3 (PO4) 2; the shell is MnxFe1-x (PO4) y (ferromanganese phosphate), x is more than or equal to 0.1 and less than or equal to 0.9, and y is more than or equal to 0.67 and less than or equal to 0.75. The invention provides a core-shell ferromanganese phosphate precursor which takes Fe3 (PO4) 2 as a core and MnxFe1-x (PO4) y as a shell, and when the core-shell ferromanganese phosphate precursor is used for preparing lithium ferromanganese phosphate, the problem of component segregation is solved, and the Jahn-Teller effect of manganese is reduced; especially for subsequent doping and coating, doping segregation is expected to be reduced, coating interface impedance is reduced, and rapid charging of the prepared material and cycling stability under large current can be remarkably enhanced.

The invention relates to a lithium battery positive electrode material, in particular to a micron-sized O2 type lithium-manganese-rich positive electrode active material, preparation and application in a solid-state lithium battery. The synergistically modified micron-sized O2-type lithium-manganese-rich positive electrode material is an O2-type lithium-manganese-rich positive electrode active material subjected to bulk phase internal doping and external surface modification; wherein the molecular formula of the O2-type lithium-rich manganese positive electrode active material is Li1 (LixMnaTMy) O2, and TM is a transition element Ni and / or Co; the doping element in the bulk phase is one or more of Al, Ti or Zr elements; the external modification is to modify the surface of the active substance through a sulfur source or a fluorine source. The preparation method provided by the invention can realize regulation and control on the bulk phase, surface structure, morphology and particle size of the O2-type lithium-manganese-rich positive electrode material, realizes preparation of the micron-sized O2-type lithium-manganese-rich positive electrode material with a stable structure, enhances good solid-solid interface contact between the positive electrode active material and the inorganic solid electrolyte, inhibits interface side reaction, and improves the performance of the lithium-manganese-rich positive electrode material. The electrochemical performance of the inorganic solid-state lithium battery is favorably improved.

The invention discloses a sodium-ion battery positive electrode material preparation system, and relates to the technical field of sodium-ion battery production, and the sodium-ion battery positive electrode material preparation system comprises a raw material intelligent management and control module, an equipment linkage control module, a sintering process precise regulation and control module, a quality online monitoring module and a data management and analysis module; through high-precision automatic weighing and closed conveying of the raw material intelligent management and control module, the raw material matching precision is improved, material loss is reduced, by means of a collaborative logic algorithm of the equipment linkage control module, the material circulation efficiency is improved, the production period is shortened, and by means of dynamic regulation and control of the sintering process precise regulation and control module, the production efficiency is improved. The sintering qualified rate is improved, the product batch quality difference is reduced, unqualified products are reduced by using real-time detection and feedback of the quality on-line monitoring module so as to reduce the production cost, process optimization, quality tracing and energy consumption monitoring are realized through the data management and analysis module, the comprehensive energy consumption is reduced, and the production efficiency is improved. And large-scale, high-quality and low-cost production of the sodium-ion battery positive electrode material is realized.

The invention discloses a waste lithium ion battery comprehensive recovery method based on electrochemical driving, and belongs to the technical field of battery resource recovery. The invention relates to a comprehensive recovery method for waste lithium ion batteries based on electrochemical driving, which aims at the problems of low lithium recovery rate, high treatment cost, serious environmental pollution and the like in the traditional wet-process and pyrogenic-process recovery process, and provides a method for inducing lithium to generate electrochemical deposition on an anode / diaphragm interface through a rapid charging process to realize directional enrichment of active lithium and realize comprehensive recovery of the lithium ion batteries. And then through water immersion treatment, efficient separation and recovery of lithium, graphite and the cathode material are realized. The method is simple in process, environment-friendly, low in energy consumption and suitable for selective extraction of lithium in various types of waste lithium ion batteries, and a technical path with a good application prospect is provided for cyclic utilization of lithium resources.

The invention belongs to the technical field of positive electrode materials, and provides a lithium-rich manganese-based positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: mixing a manganese-based metal ion solution, a precipitator solution and a complexing agent solution to obtain a manganese-based composite material precursor suspension, and drying to obtain a precursor; mixing the precursor with a lithium source, and then sequentially mixing and reacting with a phosphate radical source, a borate radical source and a niobium source to obtain a phosphorus boron niobate coated precursor; and mixing the precursor with a lithium source, and sintering. The invention also discloses the lithium-rich manganese-based positive electrode material prepared by the method. The positive electrode of the lithium ion battery comprises the positive electrode material. The lithium-rich manganese-based positive electrode material disclosed by the invention has a gradient coating structure, and the structure enables the positive electrode material to be high in capacity, good in cycle performance and less in interface side reaction; according to the invention, an in-situ co-firing bonding process is adopted, and a liquid-phase impregnation-segmented sintering integrated process is adopted, so that chemical bonding of a coating layer and a matrix is realized, interface falling is avoided, and the structural stability is enhanced.

The application belongs to the field of lithium ion battery cathode material preparation, and particularly relates to a high-voltage type single-crystal lithium manganate, a preparation method and application thereof. The scheme mixes a manganese source compound, a lithium source compound and a transition metal oxide according to a molar ratio of 1:0.5-0.6:0.1-0.3, deoxidizes and sinter, to obtain a single-crystal lithium manganate intermediate product; the obtained intermediate product is used as a raw material to prepare a finished product; the deoxidizing and sintering operation is to raise the temperature from room temperature to 800-1000 DEG C at a temperature raising rate of 20-30 DEG C / min, and keep constant temperature for 2-6 h, no temperature keeping operation is performed in the temperature raising process, after the constant temperature stage is finished, the temperature is lowered to 400-500 DEG C at a temperature lowering rate of 50-100 DEG C / h, and keep constant temperature for 2-4 h, to prepare the high-voltage type single-crystal lithium manganate cathode material. The scheme can significantly improve the capacity and high-temperature cycle performance of the lithium manganate material, and inhibit the battery expansion rate, through fast temperature raising, gradient temperature lowering and the cooperation of radius-matched doping elements. Meanwhile, the application also provides application of the high-voltage type single-crystal lithium manganate cathode material in a battery.

The invention discloses a vanadium iron-site doped iron phosphate material and a preparation method, and relates to the technical field of lithium ion battery positive electrode material preparation, pure water is used as a base solution, and a vanadium salt solution with the pH value of 2.0-3.0, a ferrite solution with the pH value of 1.0-2.5 and a phosphorus-oxygen mixed solution with the pH value of 5.0-7.0 are simultaneously added into a reaction kettle in a three-strand parallel flow mode for a co-precipitation reaction. By controlling the acid environment of a key solution system, reduction of metavanadate radicals or generation of ferric vanadate precipitates is effectively inhibited, and vanadium elements are successfully and uniformly doped to iron sites of iron phosphate crystal lattices; the mass ratio of iron to phosphorus in the obtained iron phosphate material is stabilized at 95-98%, the doping amount of vanadium is 100-10000 ppm, and the vanadium is uniformly distributed. Lithium iron phosphate prepared by taking the material as a precursor has higher discharge capacity and compaction density, and the electrochemical performance of a lithium ion battery is remarkably improved.

The chemical formula of the positive electrode material is Naa (Ni2 / 5Fe1 / 5Mn2 / 5) bCacSrdCueTifLigZnhO2, a is greater than or equal to 0.95 and less than or equal to 1.1, b is greater than or equal to 0.75 and less than or equal to 0.9, c is greater than or equal to 0.006 and less than or equal to 0.007, d is greater than or equal to 0.003 and less than or equal to 0.004, e is greater than or equal to 0.03 and less than or equal to 0.05, f is greater than or equal to 0.08 and less than or equal to 0.12, g is greater than or equal to 0.008 and less than or equal to 0.012, and h is greater than or equal to 0.01 and less than or equal to 0.03. By doping calcium, strontium, copper, magnesium, titanium and zinc elements in the layered structure, the complex phase change of the positive electrode material in the charge-discharge cycle process is inhibited, and the cycle stability of the positive electrode material is improved; by regulating and controlling the molar weight of the doping element in the application range, the O3 type positive electrode material has high charge-discharge specific capacity and can maintain high working voltage.

A lithium manganese iron phosphate cathode material, including a first lithium manganese iron phosphate particle and a second lithium manganese iron phosphate particle. A molar ratio of Mn to Fe in the first lithium manganese iron phosphate particle is greater than or equal to 1. A molar ratio of Mn to Fe in the second lithium manganese iron phosphate particle is smaller than or equal to the molar ratio of Mn to Fe in the first lithium manganese iron phosphate particle. A particle size of the first lithium manganese iron phosphate particle is smaller than or equal to a particle size of the second lithium manganese iron phosphate particle. A preparation method of the lithium manganese iron phosphate cathode material and an application thereof are provided.

The invention relates to an application of a high-magnification nanocrystallization iron molybdate sodium ion battery positive electrode material, and the nanocrystallization iron molybdate sodium ion battery positive electrode material is an iron molybdate positive electrode material subjected to nanocrystallization optimization and is used for preparing a sodium ion battery. The reversible specific capacity of the nanocrystallized iron molybdate sodium ion battery positive electrode material in a sodium ion battery reaches up to 91 mAh / g, most of the capacity is kept under high current, and the capacity retention rate still can exceed 80% after 100 times of circulation. The nano-fibers are sintered into nano-particles, and the loading capacity can be controlled, so that the nano-fibers are used in the sodium-ion battery positive electrode material. Besides, by virtue of the greatly improved ion diffusion rate and structural stability of the nano-sized iron molybdate, high specific capacity, excellent rate capability and long cycle life can be realized at the same time, and the nano-sized iron molybdate is a high-performance sodium battery positive electrode material with great potential.

This invention relates to a high-energy-density lithium iron phosphate cathode material and its preparation method. The method includes: thoroughly mixing anhydrous iron phosphate A and B, containing different amounts of doping elements, with a carbon source, a lithium source, a modifying additive, and a solvent, and then grinding them separately to obtain slurries A' and B' of different particle sizes; mixing slurries A' and B' in a certain proportion and spray-drying them to obtain powder; sintering the powder under an inert atmosphere, followed by grinding and sieving to obtain the lithium iron phosphate cathode material. This invention prepares slurries of different particle sizes from iron phosphate raw materials with different doping amounts and grain sizes, and mixes them in a specific proportion, which can form a good particle size distribution after sintering. The final lithium iron phosphate cathode material has a high compaction density, and the preparation method is simple and easy to operate, suitable for large-scale industrial production.

The application relates to a sodium-intercalated composite hydroxide and a secondary battery positive electrode material, and a sodium composite hydroxide preparation method which comprises the following steps: S1, mixing water, a complexing agent, a precipitant, an optional additive and a mixed metal solution to perform a coprecipitation crystallization reaction, performing solid-liquid separation after the reaction, and obtaining a hydroxide precursor; S2, adding the hydroxide precursor obtained in S1, a sodium metal solution and an oxidizing agent into a pipeline reactor, wherein the molar ratio of the hydroxide precursor to sodium ions in the sodium metal solution is 10:(0.5-5), the reaction temperature in the pipeline reactor is controlled to be 110-300 DEG C, the reaction pressure is 1.0-10 MPa, the continuous reaction is performed for 0.5-20 hours, the pipeline reactor is discharged after the continuous reaction, the solid-liquid separation is performed on the obtained material liquid, the solid phase is obtained, the solid phase is dried, and a sodium-intercalated composite hydroxide is obtained. The sodium-intercalated composite hydroxide is subjected to heat treatment to form a solid solution, is further calcined to form a secondary battery positive electrode material, and the uniformity, stability and cycle performance of the material are improved.

Secondary battery, characterized in that the secondary battery comprises a cathode foil and an anode foil, wherein the cathode foil comprises an active cathode material, the active cathode material comprising an olive-like phosphate and a lithium-containing oxide; wherein the secondary battery satisfies the following: (a×b) / c = 0.6 to 5; where a denotes a slope of a curve segment between a first oxidation plateau and a second oxidation plateau on a charging curve with a unit of V, obtained at 25°C within an operating voltage range of 2.5 V to 4.25 V; wherein a voltage range of the first oxidation plateau is 3.3 to 3.5 V, while a voltage range of the second oxidation plateau is 4.0 to 4.1 V; where b ↑a volume-phase lithium-ion transport impedance of the cathode foil in an EIS test at a SOC value corresponding to a minimum value between a first curve peak and a second curve peak of a dQdV-V curve at 25°C within the operating voltage range of 2.5 V to 4.25 V; where c denotes a decay rate of an anode potential during a charging process of the secondary battery at 25°C within the operating voltage range of 3.7 V to 4.25 V with a unit of V-1.

This application provides a KVOH nanomaterial, its preparation method, and an aqueous zinc-ion battery to address the technical problem of low performance of vanadium pentoxide cathode materials in the prior art. The KVOH nanomaterial provided in this application is obtained by a solvothermal reaction in an aqueous ethylene glycol solution. The introduction of potassium ions in the reaction expands the ion transport channels between the electrode material layers, improving the cycle performance of the battery. At the same time, the introduction of tetravalent vanadium also increases the specific capacity of the battery, thereby solving the technical problem of low performance of vanadium pentoxide cathode materials in the prior art.

Lithium-ion batteries (LIBs) which include a metal phosphate coating material reactive (scavenging) or stable with cathode materials, HF, LiF, PF5−, and LiOH. The metal phosphates may be applied on the cathode material of LIBs.

Lithium-ion secondary battery, characterized in that the lithium-ion secondary battery comprises a cathode foil, an anode foil and an electrolyte, wherein the cathode foil comprises a cathode current collector and a cathode film layer arranged on at least one side of the cathode current collector, wherein the cathode film layer comprises an active cathode material, wherein the active cathode material comprises particles of lithium-containing transition metal phosphate which are coated on at least part of their surface with a carbon coating material, wherein in the cross-sectional area of ​​the cathode film layer along the thickness direction of the electrode foil, the area fraction of particles with a particle size greater than or equal to 1.5 µm is greater than or equal to 8.0% and less than or equal to 20.0%; where in the cumulative distribution curve of the graphitization degree C value of the cathode film layer obtained in a surface scan mode of the laser microconfocal Raman spectrometer, the median of the graphitization degree C 50 greater than or equal to 0.95 and less than or equal to 1.20, where the degree of graphitization is the C-value. G / I D is, where I G a G-peak intensity of the Raman spectrum at 1580±100cm -1 and I D a D peak intensity of the Raman spectrum at 1350±100cm -1 represents.

This invention discloses a rare-earth metal gradient-doped polyanionic cathode material, its preparation method, and its application. The molecular formula of the rare-earth metal gradient-doped polyanionic cathode material is Na. 2+2x‑y RE y Fe 2‑x (SO4)3, in the rare earth metal gradient-doped polyanionic cathode material, rare earth metal elements enter the crystal lattice of the polyanionic cathode material in the form of rare earth metal ions, and the doping content of the rare earth metal ions decreases in a gradient along the direction from the crystal lattice surface to the bulk phase. The polyanionic cathode material is an Alluaudite-type sodium iron sulfate cathode material. This invention effectively solves the kinetic mismatch problem of "fast ions but slow electrons" in rate performance by simultaneously optimizing the electronic structure and sodium ion channels through rare earth doping, significantly improving the structural stability of the material under long-cycle and fast-charge-discharge conditions. Simultaneously, the assembled sodium-ion battery exhibits excellent wide-temperature performance.

This application discloses a cathode material and its preparation method, a cathode, a sodium battery, and an electrical device. The cathode material includes a material with the chemical formula Na... q Ni x Mn y Fe z Zn p M i O j The layered oxide shown has the following properties: 0.8 ≤ q ≤ 1, 0.1 ≤ x ≤ 0.3, 0.2 ≤ y ≤ 0.5, 0.2 ≤ z ≤ 0.35, 0.02 ≤ p ≤ 0.075, 0 ≤ i ≤ 0.1; M is a doped metal element. The cathode material preparation method includes adding Na... q Ni x Mn y Fe z Zn p M i O j The precursor undergoes a sintering process. The positive electrode contains the layered oxide shown in the chemical formula, and the sodium battery contains this positive electrode. The electrical device contains this sodium battery. The layered oxide contained in the positive electrode material of this application exhibits high structural stability, high specific capacity, and good cycle stability of reversible capacity. The sodium battery has high energy density and good cycle performance.