55results about How to "Increase the diffusion coefficient" patented technology

The invention belongs to the technical field of lithium batteries, and discloses a lithium nickel manganese oxide positive electrode material, a preparation method thereof and a lithium ion battery. Wherein the lithium nickel manganese oxide positive electrode material has a regular truncated octahedron single crystal structure, and the ratio K of a (111) crystal face orientation parameter to a (100) crystal face orientation parameter in an XRD (X-Ray Diffraction) spectrogram of the lithium nickel manganese oxide positive electrode material is 1-1.6. The lithium nickel manganese oxide positive electrode material provided by the invention has excellent rate capability and cycling stability, and can be well applied to production and manufacturing of lithium ion batteries.

The invention discloses a composite solid electrolyte diaphragm which comprises a bacterial cellulose membrane, fluorinated metal modified PEO electrolyte particles and functional group modified particles, and the fluorinated metal modified PEO electrolyte particles and the functional group modified particles are loaded in a three-dimensional network structure of the bacterial cellulose membrane. The functional group modified particles are functional group modified silicon dioxide particles and functional group modified LATP particles, the functional group modified silicon dioxide particles uniformly wrap the functional group modified LATP particles, and fluorinated metal of the fluorinated metal modified PEO electrolyte particles is combined with functional groups of the functional group modified particles through coordinate bonds. The invention also discloses a preparation method of the electrolyte diaphragm and a battery with the electrolyte diaphragm. The ionic conductivity of the electrolyte diaphragm is improved.

The invention discloses a high-rate lithium nickel manganese oxide material modified by high-entropy doping site design, a preparation method thereof and a lithium ion battery, and belongs to the technical field of lithium nickel manganese oxide materials, the preparation method comprises the following steps: adding a lithium source, a nickel source and a manganese source into water according to LiNi < 0.5-x > N < x > Mn < 1.5-y > M < y > O < 4 >, and stirring to obtain a mixture; and adding soluble salt or metal oxide of covalent or heterovalent doped ions M with radius close to that of Mn < 4 + > ions and soluble salt or metal oxide of covalent or heterovalent doped ions N with radius close to that of Ni < 2 + > ions into the first solution, adding a complexing agent and a viscosity regulator, regulating the pH value, aging, drying and sintering. Ions with similar atomic radiuses are selected for different atomic sites for design replacement, and lattice distortion is avoided. High-valence metal ions such as V < 5 + > / Nb < 5 + > / Sb < 5 + > / Mo < 6 + > are added, so that the cation disorder of the material is improved, and the ionic conductance and the electronic conductance of the crystal material are further improved.

The invention discloses a preparation method of a metal oxide coated high-nickel ternary positive electrode material, which comprises the following steps of: dissolving a solution containing coated metal in an organic solvent under a stirring condition to obtain a solution containing metal oxide; adding the high-nickel ternary material powder into an organic solvent under ultrasonic operation to obtain a solution of the high-nickel ternary positive electrode material powder; dropwise adding the solution containing the metal oxide into the solution of the high-nickel ternary positive electrode material powder under ultrasonic operation to obtain a mixed solution; heating the mixed solution under a magnetic stirring condition to volatilize the solvent, collecting the material, and drying in a vacuum drying oven; and calcining the dried material in pure oxygen to obtain the metal oxide coated high-nickel ternary positive electrode material. The electrochemical performance of the high-nickel ternary positive electrode material at low temperature can be effectively improved, specifically, the surface of the positive electrode is regulated and controlled, the contact area of the surface of the ternary positive electrode material and electrolyte at low temperature is reduced, so that side reaction is reduced, and meanwhile, the coating layer with certain mechanical strength can be formed in the long-term cycle process at low temperature, so that the electrochemical performance of the high-nickel ternary positive electrode material is improved. Positive electrode breakage is effectively reduced, and the cycling stability of the high-nickel ternary positive electrode at low temperature is effectively improved.

The invention relates to the technical field of image processing, and discloses an interactive processing method for an infrared image, comprising the following steps: S1, acquiring an infrared image to be processed; s2, preprocessing the infrared image, and extracting noise characteristics, edge characteristics and scene characteristics; s3, receiving feedback information input by the user through the user interaction interface, wherein the feedback information comprises enhancement intensity, denoising intensity and definition of the region of interest; s4, constructing an optimization model based on a variational method, wherein the optimization model guides image processing by describing denoising, detail enhancement and image smoothing optimization targets; and S5, introducing partial differential equation constraints. Through an energy functional optimization model and partial differential equation constraint, the denoising and detail retention capability of the infrared image is improved; parameters are dynamically adjusted in combination with a user interaction mechanism, and personalized requirements are met; an explicit time step iteration method is adopted, calculation efficiency is improved, precision and stability are both considered, and the method adapts to complex scenes.

The invention discloses a multiplying power type electrolyte additive, electrolyte and a lithium ion battery, and belongs to the technical field of lithium ion, the multiplying power type electrolyte additive is a silane group dimethyl ether compound containing two symmetrical structures, and the general formula of the additive is # imgabs0 #; the lithium ion battery comprises a positive plate, a negative plate, an isolating membrane and the multiplying power type electrolyte. According to the invention, the dimethyl ether compound of the methoxy silane group with a symmetrical structure is used as an additive to be applied to the preparation of the lithium ion battery electrolyte. According to the present invention, the dimethyl ether compound containing the methoxy silane group with the symmetric structure is combined with the auxiliary additive so as to provide characteristics of low cell impedance, excellent battery charge-discharge and cycle performance, and high temperature performance of the cell in the high energy density battery system; the electrolyte is used for manufacturing the lithium ion battery, and the obtained battery has excellent charge-discharge performance.

The invention provides a modified diaphragm for a polyanion solid sodium battery and a preparation method of the modified diaphragm. The modified diaphragm comprises: a base membrane; the solid electrolyte layer is arranged on at least one side surface of the base membrane, and the solid electrolyte layer comprises an oxide solid electrolyte and a polymer solid electrolyte; and the gel electrolyte layer is arranged on the outer surface of the oxide solid electrolyte layer. According to the invention, the diaphragm can better adapt to a high-pressure system, the transmission rate and the diffusion coefficient of sodium ions are improved, so that the cycle life of a polyanion solid sodium battery is prolonged, the rate capability and the low-temperature performance of the battery are improved, the thermal stability of the diaphragm is improved, and the service life of the battery is prolonged. The adverse effects of positive and negative electrode contact, chemical reaction and the like caused by thermal shrinkage of the diaphragm are avoided; in addition, the puncture resistance of the diaphragm is improved while the air permeability is not influenced and the dynamics is ensured, the addition amount of the liquid electrolyte is obviously reduced, and the safety performance of the battery is effectively improved.

The invention belongs to the technical field of battery materials, and particularly relates to a modified high-nickel ternary positive electrode material and a preparation method and application thereof. The preparation method of the modified high-nickel ternary positive electrode material provided by the invention comprises the following steps: 1) mixing a lithium source, a precursor, a tellurium source and a divalent metal compound, and performing first calcination to obtain a first calcined product; (2) dissolving tellurate in an organic solvent, mixing and grinding the formed tellurate organic solvent solution and the first burning product obtained in the step (1), and then carrying out second burning to obtain a second burning product; the tellurate is selected from at least one of potassium tellurite and sodium tellurite; and (3) washing the secondary calcined product obtained in the step (2) with water, mixing with boric acid, and carrying out third calcination to obtain the modified high-nickel ternary positive electrode material. Through the specific preparation method and the synergistic effect among the steps, the obtained modified high-nickel ternary positive electrode material has good specific capacity, first effect and cycle performance.

The invention discloses a method for preparing 2, 5-furandicarboxylic acid through selective catalytic oxidation of 5-hydroxymethylfurfural by using a nano-microstructured multi-metal oxide, which comprises the following steps: mixing different metal salts and an alkaline additive in a solvent, and preparing 2, 5-furandicarboxylic acid by using the characteristics of excellent dissolving capacity and diffusion performance of the solvent in a subcritical state. According to the method, metal ions are fully contacted and rapidly crystallized in subcritical fluid, the temperature and pressure in the reaction process are regulated and controlled to regulate and control the microstructure of the multi-metal oxide, so that multi-metal active sites are excited, and then roasting is performed to prepare the multi-metal oxide catalyst. And the 5-hydroxymethylfurfural can be efficiently and selectively converted into the 2, 5-furandicarboxylic acid under alkaline and aqueous solution conditions. The catalyst prepared by the method has the advantages of high dispersity, strong controllability and rapid crystallization. Compared with a noble metal catalyst, the multi-metal oxide catalyst prepared by the method disclosed by the invention is relatively low in cost, high in stability, recyclable and wide in application environment.

This invention discloses a method and system for predicting the dissolution time of bubbles in oil-paper insulation, belonging to the field of electrical equipment insulation technology. The method includes: calculating the amount of various gases dissolved per unit volume of oil after the gas dissolution in oil reaches equilibrium; using 47℃ as a reference temperature, extrapolating this data to other temperatures and solubilities using the Arrhenius relation, and calculating the diffusion coefficients of various gases in oil at each temperature; calculating the diffusion coefficients of various gases in paper at each temperature; establishing a prediction model for the dissolution time of bubbles in oil-paper insulation, and calculating the dissolution time. This invention considers three factors—gas solubility in oil, diffusion coefficient in oil, and diffusion coefficient in paper—that vary with temperature and gas type, and calculates the dissolution time of a single stationary bubble in oil-paper insulation. This effectively reduces the risk of bubbles during transformer operation and can be widely applied to oil-paper insulation systems with the same kinetic description.

The invention relates to a controllable low-oxygen silicon preparation method capable of reducing oxidation of silicon wafer cutting waste, and belongs to the technical field of silicon wafer cutting waste recovery and utilization. The method comprises the following steps: crushing and shaping silicon wafer cutting waste blocks to obtain silicon wafer cutting waste particles; then the silicon wafer cutting waste particles are evenly laid in a microwave heating furnace in a layered mode, the silicon wafer cutting waste particles on the adjacent horizontal layers are isolated through cloth in the vertical direction, and gaps are reserved between the adjacent silicon wafer cutting waste particles on the same horizontal layer; according to the initial water content, the initial oxygen content, the expected oxygen content, the device vacuum degree, the set temperature and the particle size, the preset time of microwave heating controllable dewatering and drying of the silicon wafer cutting waste particles is determined; under the vacuum condition, microwave heating can controllably dehydrate and dry to reduce the actual moisture content of the silicon wafer cutting waste and the actual oxygen content of the product, so that the controllable preparation of the low-oxygen silicon product is realized by reducing the oxidation of the silicon wafer cutting waste.

The negative plate comprises a current collector and a coating layer, the coating layer is arranged on at least one side of the current collector in the thickness direction, the coating layer comprises a first coating layer and a second coating layer, the first coating layer is arranged on at least one side of the second coating layer in the width direction of the current collector, and the second coating layer is arranged on at least one side of the second coating layer in the width direction of the current collector. The electrode plate is positioned in the edge area of the negative plate; wherein the hard carbon content of the first coating is higher than that of the second coating. The hard carbon content of the first coating is higher than the hard carbon content of the second coating, and the lithium ion diffusion coefficient of the hard carbon is obviously higher than that of the graphite, so that the charging rate of the first coating is obviously higher than that of the graphite. And the problem of lithium separation caused by lithium ion accumulation is reduced.

The present invention discloses a rate-type electrolyte additive, an electrolyte and a lithium-ion battery, which belong to the field of lithium-ion technology. The rate-type electrolyte additive is a dimethyl ether compound containing two symmetrically structured silane groups, and the general formula of the additive is:; The lithium-ion battery comprises a positive electrode sheet, a negative electrode sheet, a separator and the above-mentioned rate-type electrolyte. The present invention uses a dimethyl ether compound of a symmetrically structured methoxysilane group as an additive to manufacture a lithium-ion battery electrolyte. The dimethyl ether compound containing a symmetrically structured methoxysilane group is used in combination with an auxiliary additive, and in a high-energy-density battery system, it has lower cell impedance, better battery charge-discharge and cycle performance, and can also take into account the high-temperature performance of the cell. The electrolyte is used to manufacture a lithium-ion battery, and the resulting battery has excellent charge-discharge performance.

The application provides a positive electrode active material, a preparation method of the positive electrode active material and a potassium ion battery, and relates to the field of secondary batteries. The positive electrode active material comprises a core and a carbon layer covering the core, and the chemical formula of the core is K 3+x V 3‑x Ni x (PO4)4, 0.05<=x<=0.5. In the application, Ni 2+ is doped in the KVP material, so that the structural stability and the electrochemical performance of the positive electrode active material are effectively improved. Specifically, by doping Ni 2+ , the product purity and the crystalline integrity of the positive electrode active material are significantly improved, the structural stability of the product is enhanced, and the problems of low product purity and many impurities in the existing preparation method are solved. Moreover, the reaction kinetics and the cycle performance of the positive electrode active material are synergistically optimized.

The invention discloses a layered oxide positive electrode material of a sodium-ion battery and a preparation method of the layered oxide positive electrode material, and belongs to the technical field of batteries. The method comprises the following steps: preparing a NaNi < 0.33 > Mn < 0.33 > Fe < 0.33 > O2 precursor, mixing the precursor with a Na2S and P2S5 mixture under argon, carrying out heat treatment at 500 DEG C, and sintering with sodium hydroxide in an oxygen atmosphere at 800 DEG C to obtain the material. The core of the material is that a continuous super-ion conductor phase is formed on a grain boundary, a three-dimensional ion transmission network and a mechanical strengthening framework are constructed, the ion diffusion efficiency and the structural stability are remarkably improved, high-rate and long-cycle performance breakthrough is achieved, the process is controllable, and the industrialization potential is large.

The present invention discloses an electrode material of a biomass-derived carbon composite transition metal sulfide solid solution, comprising a biomass-derived carbon skeleton with a three-dimensional network hollow tubular structure and transition metal sulfide solid solution nanoparticles loaded on the carbon skeleton; the electrode material has a chemical composition represented by ABX@BDC, wherein A and B are independently selected from one of transition metal elements Fe, Co, Ni, Cu, Mn, Zn and Sn, X is a non-metallic element S or Se, and BDC is a biomass-derived carbon skeleton. The electrode material prepared by the present invention has high specific capacity, excellent cycle stability and rate performance. And it has attractive reversible capacity, ultra-long cycle life and good structural stability at ultra-high rate. The raw material resources are abundant, the cost is low, the preparation process is simple, the time consumption is short, the reaction conditions are also very easy to achieve, and it can be mass-produced, convenient for commercial application, and shows great application prospects in sodium ion batteries.

The invention relates to the field of lithium batteries, and discloses a method for preparing lithium iron phosphate from waste lithium iron phosphate, which comprises the following steps: carrying out first sintering on waste lithium iron phosphate to obtain red powder I; detecting the contents of main elements and impurity elements in the red powder I; supplementing at least one of a lithium source, a phosphorus source, a titanium source and a vanadium source by taking the iron element as a reference according to a detection result; or detecting the contents of main elements and impurity elements in the waste lithium iron phosphate, supplementing the lithium source according to the detection result, sintering, and then supplementing at least one of the phosphorus source, the titanium source and the vanadium source; and finally, grinding, spray drying and sintering to obtain the lithium iron phosphate material. By accurately controlling the molar ratio of lithium, iron, titanium, vanadium and phosphorus, the lithium ion diffusion coefficient of lithium iron phosphate is improved from the atomic level, generation of magnetic foreign matters in the high-temperature sintering process of lithium iron phosphate crystals is inhibited, meanwhile, material particles are uniform, and the main phase purity is greatly improved.

The invention relates to the field of high polymer materials, in particular to composite resin and a preparation method and application thereof, and a gas separation membrane and a preparation method and application thereof. The composite resin comprises polyimide and a zeolite molecular sieve chemically bonded with amino groups on the surface. The polyimide composite resin provided by the invention is high in gas permeability coefficient and difficult to plasticize, and relieves the Trade-off effect to a certain extent. The method is especially suitable for preparation of gas separation membranes.

The application provides a GaN-based light-emitting diode epitaxial structure and a preparation method thereof, wherein a Zn source is introduced as a surface activator during the growth of a P-type AlGaN electron blocking layer, a P-type AlGaN electron blocking layer structure with a gradient distribution of Zn concentration along the direction of the P-type AlGaN electron blocking layer is constructed, and specifically, through the core role of the Zn surface activator and the innovative design of the gradient distribution of the Zn concentration, the valence band Ev is smoothly and non-peaked along the whole process, and the hole injection is smooth along the whole process under the premise of ensuring that the conduction band Ec is smoothly and non-peaked and the strong electron blocking capability is not lost.

The invention discloses a ternary positive electrode material, a preparation method thereof and a lithium ion battery. The general formula of the ternary positive electrode material is LiNixCoyMnzM1-x-y-zO2, x is larger than or equal to 0.6 and smaller than 1, y is larger than 0 and smaller than or equal to 0.2, z is larger than 0 and smaller than or equal to 0.2, M is a doping element, and M is selected from one or more of Nb, W, Ta, Ti, Hf, Mo, La, Ce and Zr; the ternary positive electrode material is tested through an X-ray energy disperse spectroscopy (EDS), the molar percentage content of M tested under the energy of 10 keV is recorded as P1, the molar percentage content of M tested under the energy of 20 keV is recorded as P2, and the ternary positive electrode material meets the condition that P2 / P1 is larger than 0.2 and smaller than 0.9. According to the method, deep transition metal ion doping of the surface layer of the ternary material is achieved, in the circulation process, the deep doped ions play a stronger rivet role in the structure, and long-term circulation structural stability can be achieved.

The invention discloses a rare earth magnet and a preparation method thereof, belonging to the technical field of rare earth magnets. The rare earth magnet is obtained by coating a diffusion source on a neodymium iron boron base material, performing diffusion and aging treatment, wherein the diffusion source alloy component is R α M β B γ Fe 100‑α‑β‑γ , where R refers to at least one of Nd and Pr, M refers to at least one of Al, Cu and Ga, and NdFeB magnet is R a M b B c Fe 100‑a‑b‑c , wherein R refers to at least one of Nd, Pr, Ce, and La, M refers to at least one of Al, Cu, Ga, Ti, Zr, Co, Mg, Zn, Nb, Mo, and Sn, and the remaining component is Fe. A rare earth magnet and a preparation method thereof of the present invention has a remanence reduction range of less than 0.3 kGs and an Hcj increase range of more than 4 kOe.

The invention belongs to the technical field of energy storage materials, relates to a lithium ion battery electrode material, and discloses a titanium niobate material rich in stacking fault defects and a preparation method and application thereof. The crystal structure of the titanium niobate material at least comprises a fault defect, the fault defect is that an atomic layer is inserted into the normal sequence of the crystal of the titanium niobate, the stacking sequence of the atomic layer is different from that of the other atomic layers, and two reverse-sequence stacking layers appear at the position. The precursor subjected to heat treatment is subjected to quenching treatment, the fault defect structure is introduced, the electron energy band structure of the TNO crystal is changed through introduction of the fault defect structure, the forbidden band width of quenched TNO is shortened, the electronic conductivity of the material is improved, impedance is reduced, and the electrochemical performance of the material is improved. Meanwhile, the Li < + > diffusion rate is increased, the ionic conductivity is improved, and the electrochemical performance is improved.

The invention relates to the technical field of sintered type NdFeB permanent magnets, in particular to a high temperature resistant magnet. There is provided a preparation method for the magnet including a step of preparing a mixture of the NdFeB alloy flakes and a low melting point powder, wherein the low melting point powder comprises at least one of NdCu, NdAI and NdGa.

This invention discloses a preparation method and application for improving the fast-charging performance of graphite composite materials. The preparation method involves mixing a graphite precursor with a catalyst and a conductive liquid, ball milling the mixture, followed by pre-carbonization, low-temperature graphitization, and acid washing to obtain a graphite precursor material. Then, the graphite precursor is mixed with a heteroatom polymer, a phosphorus compound, and an organotitanium compound, and heat-treated to obtain the graphite composite material. The graphite composite material prepared by this invention utilizes a catalyst to enhance the anisotropy of carbon during graphitization, and improves electronic conductivity through the conductive agent doped into the core. The titanium dioxide coating on the composite material's outer shell has the characteristics of large interlayer spacing, low expansion rate, and structural stability, which improves the lithium-ion insertion / extraction rate and rate performance. Since phosphorus itself has high specific capacity and a high voltage plateau, phosphorus doping improves the specific capacity and voltage plateau of the composite material, thus enhancing its fast-charging performance.

The present invention belongs to the technical field of sodium ion batteries, and discloses a manganese-rich sodium ion positive electrode material and a preparation method and application thereof. The general formula of the sodium ion positive electrode material is Na(Z k Ni t Mn f )O2 / M‑C, k+t+f=1,0

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 invention relates to a semi-solid alloying method for preparing a metal alloy material. The method comprises the following steps: firstly, obtaining a solid-liquid coexistence temperature interval suitable for treatment based on a phase diagram and thermodynamics calculation; then selecting metal raw materials forming the target component, and assembling the metal raw materials into an original blank with a close contact interface; and in the semi-solid temperature interval, a heat-force coupling process is adopted, a solid-liquid coexisting semi-solid structure is formed through local liquefaction induced by diffusion / mass transfer, and macroscopic flow mixing and microstructure reconstruction of the material are enhanced under the shear deformation or stirring effect, so that uniform alloying and structure refinement of the target alloy material are achieved. Compared with the prior art, the method has the advantages that uniform alloying and structure refinement of the alloy material can be realized under the condition that the traditional multi-step series connection of smelting, casting, heat treatment, deformation processing and the like is not needed, the alloy material with uniform components, fine matrix structure and uniformly distributed second phase is obtained, the process flow is simplified, and the energy consumption is low.

The invention discloses a method for improving the diffusion coefficient of a perovskite thin film and intercepting the high diffusion coefficient of the perovskite thin film to normal pressure under high pressure, which comprises the following steps of: crushing a (FAPbI3) 0.95 (MAPbBr3) 0.05 polycrystalline thin film, picking a proper sample by using a needle, and putting the proper sample into a diamond anvil cell; diffusion coefficient changes of the polycrystalline film under different pressures are carried out through a space-time resolution fluorescence imaging system, the pressure is increased from normal pressure to 1.8 GPa, the pressure is released after the pressure is maintained for 12 h, and the diffusion coefficient changes of the polycrystalline film at different moments after pressurization are recorded. According to the invention, the diffusion coefficient test of the polycrystalline film under different pressures is realized. As the pressure increases, the diffusion coefficient of the polycrystalline film increases first and then tends to be unchanged. The diffusion coefficient of the high polycrystalline film under the high pressure is successfully kept to the normal pressure after the pressure is relieved after the pressure is maintained for a long time at the high pressure point.

The invention relates to the technical field of lithium battery positive electrode materials, and discloses a modified positive electrode material and a preparation method thereof. The preparation method comprises the following steps: 1, mixing a positive electrode material and a dopant, and calcining to obtain a doped positive electrode material; m is greater than or equal to 1 and less than or equal to 2, and n is greater than or equal to 1 and less than or equal to 5; e is selected from one or more of Zr, Y, Mg, Ti, Ca, Ce, La, Al, Nb, Ta, W, Mo, Sn, Sb and Sr; 2, adding a solid electrolyte, an organic weak acid, an additive and the doped positive electrode material into a solvent to obtain mixed slurry, and performing acid pickling coating on the doped positive electrode material in the mixed slurry to obtain an acid pickling coating material; the additive is borate and / or phosphate; and 3, roasting the acid-washed coating material to obtain the modified positive electrode material. According to the method provided by the invention, the lithium ion migration rate of the modified positive electrode material can be improved, the total alkali content on the surface is reduced, and the rate capability, the cycle performance and the safety performance of the battery can be further improved.

The application provides an amorphous iron nitride sulfide thin film positive electrode material, a preparation method thereof and a thin film lithium battery containing the same. The positive electrode material uses nitrogen atoms to replace part of sulfur atoms in amorphous ferrous sulfide to form amorphous iron nitride sulfide, and the atomic ratio of iron, sulfur and nitrogen in the iron nitride sulfide is 1:(0.3-0.6):(0.3-0.6). The amorphous structure of the iron nitride sulfide can avoid the volume expansion of the crystalline material caused by lattice distortion; and the presence of nitrogen atoms can effectively inhibit the shuttle effect of polysulfides generated in the cycle process, so that the positive electrode thin film can be more firm, the diffusion of the active material into the electrolyte can be avoided, and the capacity and cycle life of the battery can be improved. The preparation method is simple, and the obtained iron nitride sulfide positive electrode material has the advantages of good conductivity, fast growth speed, high specific capacity, long cycle life, low preparation temperature and the like.