197 results about "Lithium nitrate" patented technology

The invention relates to the field of lithium metal batteries, and provides a lithium metal battery, a manufacturing method thereof and electric equipment, which are at least beneficial to improving the interface stability and safety of the lithium metal battery. The manufacturing method comprises the following steps: preparing an initial battery cell, injecting a first electrolyte into the initial battery cell, and then carrying out a first formation process, the first electrolyte comprising the following components: 8-23 wt% of a lithium salt, 0.01-5 wt% of carbon dots, 0.1-10 wt% of lithium nitrate and an ether solvent; a second formation process is carried out after a second electrolyte is injected into the initial battery cell, the second electrolyte comprises the following components: 8-23 wt% of a lithium salt, 5-40 wt% of a film-forming additive and an ionic liquid, and the ionic liquid comprises pyrrolidinium cations.

A method of synthesis of single crystal nickel-rich cathode materials can include preparing a precursor solution by dissolving lithium nitrate, nickel nitrate, manganese nitrate, and cobalt nitrate in water, aerosolizing the solution of a) in a stream of air using an ultrasonic sprayer, preheating the resulting droplets, premixing the droplets with methane, decomposing the droplets by passing through a co-flow burner, depositing solid particles on a filter, and calcinating the solid particles in a furnace in oxygen to produce a single crystal cathode material.

The invention provides a preparation method and application of lithium sulfide. The preparation method comprises the following steps: reacting a lithium source with a sulfur source; the lithium source is a solid lithium-containing substance with the purity of 99% or above and the whiteness of 86 or above; the solid lithium-containing substance is selected from one or more of anhydrous lithium hydroxide, lithium hydroxide monohydrate, lithium carbonate, lithium chloride, lithium bromide and lithium nitrate. According to the method, a solid lithium-containing substance with the purity of 99% or above and the whiteness of 86 or above is used as a lithium source and reacts with a sulfur source, and the ionic conductivity value of the Li6PS5Cl solid electrolyte prepared from the obtained lithium sulfide is stable. Experimental results show that the ionic conductivity can stably reach more than 2mS / cm.

The invention relates to an organic eutectic salt modified, regenerated and repaired waste lithium nickel cobalt manganate positive electrode material and a method, and the method comprises the following steps: uniformly mixing the waste lithium nickel cobalt manganate positive electrode material, an aluminum doping source and an organic eutectic salt to obtain mixed powder; the organic eutectic salt is a mixture of lithium hydroxide, lithium nitrate and lithium salicylate; carrying out primary calcination on the mixed powder, cooling, washing and drying to obtain a primary calcined material; and adding a lithium supplement agent into the primary calcined material, uniformly mixing, and carrying out secondary calcination to obtain the regenerated nickel cobalt lithium manganate positive electrode material. According to the method, the characteristics of high lithium ion concentration and low melting point of the organic eutectic salt are utilized, meanwhile, the organic eutectic salt can be used for modifying, regenerating and repairing the waste lithium nickel cobalt manganese oxide positive electrode material under the matching action of the aluminum doping source, and the method is simple, short in process, easy in raw material obtaining and suitable for industrial application; the regeneration effect is excellent, the initial capacity of the regenerated material is high, and the cycling stability is excellent.

An electrolyte solution for a lithium secondary battery, including a first solvent comprising a heterocyclic compound having at least one double bond, and any one of an oxygen atom and a sulfur atom; a second solvent including at least one of an ether-containing compound, an ester-containing compound, an amide-containing compound, and a carbonate-containing compound; a lithium salt; lanthanum nitrate; and an additive including lithium nitrate.

The invention discloses a preparation method of a lithium iron phosphate positive electrode material, and belongs to the technical field of lithium ion batteries. A preparation method of a lithium iron phosphate positive electrode material comprises the following steps: S1, dissolving lithium nitrate, ferric nitrate and ammonium dihydrogen phosphate in water to form a solution; mixing polyvinylpyrrolidone with the solution to form a mixed solution; s2, heating the mixed solution for the first time to convert the mixed solution into homogeneous gel; s3, the homogeneous gel is heated for the second time, so that the homogeneous gel is burnt, and a mixture is obtained; uniformly mixing the mixture with a carbon source; and S4, calcining the mixture which is uniformly mixed with the carbon source in a reducing gas atmosphere to obtain lithium iron phosphate powder. The invention provides the lithium iron phosphate positive electrode material prepared by the solution combustion method which is high in efficiency, strong in universality, simple in process and low in cost.

The preparation method comprises the following steps: dissolving lithium nitrate, manganous nitrate, cobalt nitrate, nickel nitrate, an organic fuel and an organic carbon source in deionized water to obtain a uniform mixed solution, atomizing the mixed solution to form carbon-containing fog drops, and preparing the lithium-rich manganese-based positive electrode material with the hierarchical pore micro-nano structure by taking nitrogen as a protective gas and a carrier gas, so as to obtain the lithium-rich manganese-based positive electrode material with the hierarchical pore micro-nano structure. Carrying out self-propagating combustion reaction on the carbon-containing fog drops at a certain ignition temperature to obtain combustion product powder; placing the combustion product in a crucible, and calcining in an inert atmosphere to obtain calcined powder; placing the calcined powder in a crucible, and calcining in an air atmosphere to remove carbon; and fully grinding the calcined product to obtain the lithium-rich manganese-based positive electrode powder with the hierarchical pore micro-nano structure. The lithium-rich manganese-based positive electrode material with the microporous-mesoporous hierarchical pore micro-nano structure is obtained, and the cycling stability of the lithium-rich manganese-based positive electrode material can be effectively prolonged. The method is simple and convenient in process, low in energy consumption, low in price and high in capacity preservation rate, and has a relatively good industrial application prospect.

The invention relates to the field of lithium metal batteries, and provides a lithium metal battery, a manufacturing method thereof and electric equipment, which are at least beneficial to improving the stability of a cathode-free lithium metal battery. The manufacturing method comprises the following steps: carrying out winding treatment or lamination treatment on a positive plate, a negative current collector and a diaphragm, and then putting into a shell to form a battery cell assembly; a first liquid injection process is carried out on the cell assembly, a first electrolyte is injected into the cell assembly, and the first electrolyte comprises the following components: lithium polysulfide, lithium nitrate, lithium salt and the balance of a non-aqueous organic solvent; performing a first formation process on the cell assembly; a second liquid injection process is carried out on the cell assembly, a second electrolyte is injected into the cell assembly, and the second electrolyte comprises fluoroethylene carbonate, a lithium salt, an electrostatic shielding additive, an anchoring filling additive and the balance of a non-aqueous organic solvent; and performing a second formation process on the cell assembly.

The invention relates to the field of lithium metal batteries, and provides a lithium metal battery, a manufacturing method thereof and electric equipment, which are at least beneficial to realizing stable work of a high-voltage lithium metal battery in a wide electrochemical window. The manufacturing method comprises the following steps: forming an initial battery cell; injecting a first electrolyte containing lithium nitrate, a lithium salt and an ether organic solvent into the initial cell; performing a first formation process; injecting a second electrolyte containing fluoroethylene carbonate, a lithium salt, a cyclic phosphazene derivative and a nitrile organic solvent into the initial cell; wherein the structural formula of the cyclic phosphazene derivative is shown in the specification, or R1-R8 are independently selected from alkoxy, cyano-containing alkoxy or fluorine-containing alkoxy, and at least one cyano-containing alkoxy and one alkoxy or fluorine-containing alkoxy exist in R1-R6; and performing a second formation process.

A method of synthesis of aluminum-doped Li6.25Al0.25La3Zr2O12 (Al-LLZO) can include preparing a precursor solution by dissolving lithium nitrate, aluminum nitrate, zirconium (IV) oxynitrate, and lanthanum nitrate in stoichiometric amounts according to the composition Li6.25Al0.25La3Zr2O12 in water, and decomposing droplets by passing through a co-flow burner. Also disclosed is a method of produce producing a thin-tape comprising Al-LLZO.

The invention discloses a lithium titanate battery, and relates to the technical field of batteries. The battery comprises a positive electrode, a negative electrode, an electrolyte and a diaphragm, and an addition product synthesized by dimethyl fumarate and benzidine according to a specific molar ratio is added into the electrolyte as a viscosity modifier, so that the viscosity increasing trend of the electrolyte at a low temperature is effectively reduced, and the migration rate of lithium ions is improved. And the electrolyte also comprises a lithium salt, an organic solvent and an auxiliary additive, so that the low-temperature performance and the cycling stability of the battery are favorably optimized. A positive active material is one or more of lithium iron phosphate, lithium manganate, lithium cobalt oxide or nickel manganese cobalt ternary materials, a negative active material is lithium titanate, and additives such as lithium nitrate and fluoroethylene carbonate are further combined, so that the capacity retention ratio and the charge-discharge efficiency of the battery in an extreme low-temperature environment of-40 DEG C are remarkably improved. The lithium titanate battery provided by the invention has excellent low-temperature adaptability, safety and long cycle life, and is applicable to power batteries and energy storage systems in alpine regions.

The invention provides a lithium ion battery and a preparation method thereof. According to the battery and the preparation method, a composite lithium metal negative electrode comprises lithium metal and lithium nitrate attached to the surface of the lithium metal; the gel polymer electrolyte is prepared from the following components in percentage by mass: 1 to 10 weight percent of comonomer, 60 to 85 weight percent of organic solvent, 5 to 20 weight percent of lithium salt and 0 to 10 weight percent of additive, the organic solvent comprises cyclic fluorocarbonate, chain fluorocarbonate and a fluoroether compound; the comonomer is an acrylate monomer; and the mass ratio of lithium nitrate in the composite lithium metal negative electrode is less than or equal to 25%. According to the lithium ion battery, lithium nitrate attached to the surface of lithium metal can be decomposed into Li3N on the surface of the negative electrode, and a stable and uniform Li3N-rich SEI film is formed. And the three solvents are fluorinated solvents, so that the lithium ion battery has high energy density and excellent normal-temperature and high-temperature cycle performance at the same time under the action of the two aspects.

The invention discloses a lithium ion battery electrolyte and a lithium ion battery. The lithium ion battery electrolyte comprises an organic solvent, a composite lithium salt and an additive, the composite lithium salt comprises lithium hexafluorophosphate, lithium bis (fluorosulfonyl) imide and lithium nitrate; the additive comprises a compound 1. By adopting the low-concentration composite lithium salt and the electrolyte containing the compound 1, the oxygenolysis of the electrolyte is inhibited, the solvation energy of solvated lithium ions is reduced, the kinetics of the electrolyte is improved, and the rate discharge, high temperature and cycle performance of the battery are improved.

The invention discloses a novel solvent system-based low-temperature lithium battery electrolyte and a production process, the novel solvent system-based low-temperature lithium battery electrolyte comprises the following components: a carbonic ester solvent, a lithium salt combination and an additive, the carbonic ester solvent comprises ethylene carbonate, fluoroethylene carbonate, 1, 3-dioxolame and ethyl methyl carbonate, and the lithium salt combination comprises a lithium salt combination and an additive; the lithium salt combination is a mixed system of lithium bis (fluorosulfonyl) imide and lithium hexafluorophosphate, and the additives are vinylene carbonate, succinonitrile, lithium nitrate, triphenyl phosphate and aluminum trifluoromethanesulfonate; according to the low-temperature lithium battery electrolyte, the performance bottleneck of a traditional electrolyte at the temperature of-40 DEG C to-30 DEG C is broken through through multi-level cooperation of solvent-lithium salt-additive preparation of the low-temperature lithium battery electrolyte, the solvent maintains low viscosity while reducing the freezing point, and low-temperature high dissociation and interface stability are achieved through lithium salt compounding; the compatibility of the solid electrolyte interfacial film structure and current collection is finely regulated and controlled through the additive, and the application requirement in the extremely cold environment is met.

This invention provides a method for preparing a positive electrode lithium supplement, comprising the following steps: Step S1: Mixing and grinding lithium nitrate and lithium hydroxide monohydrate; Step S2: Melting the material after mixing and grinding in Step S1 to obtain a mixed lithium salt of lithium nitrate and lithium hydroxide; Step S3: Mixing the mixed lithium salt with an iron source and glucose, and then pressing it into tablets; Step S4: Calcining the material after tableting in Step S3 under inert gas protection; Step S5: Cooling and sieving the calcined material after Step S4 to obtain the positive electrode lithium supplement Li5FeO4. The method of this invention for preparing Li5FeO4 has excellent properties such as small particle size, low energy consumption, short sintering time, low cost, and low calcination temperature.

The invention discloses a carbonic ester-based electrolyte containing lithium nitrate, a preparation method of the carbonic ester-based electrolyte, a lithium metal battery and a lithium ion battery, and relates to the technical field of batteries. The electrolyte comprises a carbonic ester solvent, a lithium salt, a LiNO3 additive and a non-polar anion receptor additive, the content of the non-polar anion acceptor additive is 1 vol%-10 vol%. The preparation method comprises the following steps: adding the lithium salt into the carbonic ester solvent, uniformly mixing, and adding the LiNO3 additive and the non-polar anion acceptor additive, thereby obtaining the lithium ion battery positive electrode material. The invention also provides a lithium metal battery and a lithium ion battery comprising the electrolyte. The non-polar anion acceptor additive is added to promote LiNO3 to be dissolved in the carbonic ester electrolyte, so that the solvation structure of the electrolyte is regulated and controlled, and the electrolyte enters a solvation sheath layer and is preferentially decomposed at a negative electrode interface to form SEI rich in Li3N; and dendritic crystals generated by non-uniform deposition of the lithium metal negative electrode in the lithium metal battery in the circulation process are inhibited.

The present invention relates to a preparation method of a hemispherical array Li3VO4 / C anode material for lithium-ion batteries. Polyvinyl alcohol, lithium nitrate, ammonium metavanadate, and oxalic acid are added to an appropriate amount of deionized water and stirred evenly to obtain a green solution A. To construct a microreaction environment, an appropriate amount of ethylene glycol is directly measured and filled into syringes for double-needle mixed electrospray, and the mixture is collected on a rotating receiver covered with aluminum foil with a negative voltage of 2-5 kV, dried, and calcined to obtain a hemispherical array Li3VO4 / C composite material. For the first time, the present invention uses a simple double-needle electrospray to synthesize a hemispherical Li3VO4 / C composite material as an anode material for lithium-ion batteries. For the first time, ethylene glycol is used to construct a microemulsion reaction environment, and the combination of microemulsion and electrospray is used to solve the problem of difficult morphology control in electrospray. The prepared hemispherical Li3VO4 / C composite material shows excellent electrochemical performance as an anode material for lithium-ion batteries.

The invention provides a lithium metal battery and a manufacturing method thereof, an energy storage system and electric equipment, which are beneficial to improving the performance of the lithium metal battery. The method comprises the following steps: providing a positive plate, a negative current collector and a diaphragm; winding or laminating the positive plate, the negative current collector and the diaphragm, and putting into a shell to form an initial battery cell; a first electrolyte is injected into the initial battery cell, the first electrolyte comprises a lithium salt, lithium nitrate and a solvent, the solvent at least contains 70 wt% or above of a short-chain ether solvent, and the number of carbon atoms of the short-chain ether solvent is smaller than or equal to 6; performing a first formation process on the initial battery cell; a second electrolyte is injected into the initial battery cell in a pulse type liquid injection mode, the second electrolyte comprises a lithium salt, 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether and a solvent, and the molar concentration of the lithium salt in the second electrolyte is larger than that of the lithium salt in the first electrolyte; and performing a second formation process on the initial battery cell to form the lithium metal battery.

This method comprises: mixing a first solution containing a metal nitrate with a second solution containing lithium hydroxide to precipitate a metal hydroxide; thermally decomposing lithium nitrate produced from the metal nitrate and the lithium hydroxide; and recovering lithium oxide contained in the thermal decomposition product of the lithium nitrate. This method may further comprise converting lithium oxide into lithium hydroxide and reusing the lithium hydroxide.

This invention provides a method for preparing a lithium-rich manganese-based cathode material, comprising the following steps: D1: Lithium nitrate, manganese nitrate, nickel nitrate, and cobalt nitrate are dissolved in deionized water at a molar ratio of 1.2:0.54:0.13:0.13 to prepare a metal salt solution. 1.2 Mn 0.54 Ni 0.13 Co 0.13 O2 is co-precipitated with a precipitant and a complexing agent in a solvent to generate a lithium-rich manganese-based core; D2: The lithium-rich manganese-based core is mixed with an interfacial bridging agent in an organic solvent and stirred for 2-4 hours. After drying, an interfacial bridging agent layer is formed on the lithium-rich manganese-based core; D3: The material obtained after step S2 is mixed successively with three metal salt solutions of different concentrations, and different NCM shells are coated on the outside of the interfacial bridging agent layer; D4: After high-temperature sintering, a lithium-rich manganese-based cathode material is obtained. In this invention, the LMRO core, Li2ZrO3 bridging agent, and gradient NCM shell work synergistically to greatly enhance the inhibition of lattice oxygen migration, improve structural stability, and thus significantly improve the first-time efficiency and suppress the cumulative gas release.

Certain aspects of the present disclosure may include a battery including a cathode including a fluorinated carbon material and manganese oxide, an anode including one or more of a lithium metal or a lithium alloy, and a non-aqueous electrolyte including: an organic solvent, one or more lithium salts including lithium perchlorate, and an additive material having lithium nitrate and tris-trimethyl silyl phosphite.

The present invention discloses a method for preparing ultrafine particles of low-dielectric ceramic materials for 6G, relates to the technical field of dielectric ceramic materials, and belongs to patent classification number C04B35 / 00. The specific preparation method is to first prepare a sol using tetraethyl orthosilicate, calcium nitrate, magnesium nitrate, aluminum isopropylate, zirconium oxychloride and lithium nitrate, heat the sol and let it stand for gelation, then use supercritical CO2 to dry, obtain aerogel, heat and reduce calcination to obtain (Ca, Mg) SiO3-ZrO2 nanopowder, and use atomic layer deposition technology to coat a TiO2 layer on the surface of the nanopowder to obtain ultrafine particles of dielectric ceramic materials. The ceramic particles prepared by the present invention not only have a low dielectric constant, but also have a smaller particle size and a higher density under low-temperature sintering.

A process and system are disclosed for producing lithium oxide from lithium nitrate. In the process and system, the lithium nitrate is thermally decomposed in a manner such that a fraction of the lithium nitrate forms lithium oxide, and such that a remaining fraction of the lithium nitrate does not decompose to lithium oxide. The thermal decomposition may be terminated after a determined time period to ensure that there is a remaining fraction of lithium nitrate and to thereby produce a lithium oxide in lithium nitrate product. The lithium oxide in lithium nitrate product may have one or more transition-metal oxides, hydroxides, carbonates or nitrates added thereto to form a battery electrode. The lithium oxide in lithium nitrate product may alternatively be subjected to carbothermal reduction to produce lithium metal.

In order to improve the circulation and high-temperature storage performance of a silicon-based battery, the lithium ion battery comprises a positive electrode, a negative electrode and an electrolyte, the negative electrode comprises a negative electrode active material layer, the negative electrode active material layer comprises a negative electrode active material, the negative electrode active material comprises pure silicon particles, the electrolyte comprises a lithium salt and an impregnating compound, and the impregnating compound comprises a lithium ion battery positive electrode and a lithium ion battery negative electrode. The lithium salt comprises lithium nitrate and lithium bis (fluorosulfonyl) imide; the mass percentage content of the impregnating compound in the electrolyte is A%; the mass percentage content of the lithium nitrate in the electrolyte is B%; the mass percentage content of the lithium bis (fluorosulfonyl) imide in the electrolyte is C%; the Lc thickness of the pure silicon particles is Hnm, and the Lc thickness is the crystallite size, obtained through X-ray diffraction, of the pure silicon particles in the c-axis direction; the lithium ion battery meets the formula 1: 0.009 < = (B / C) * A / H < = 0.667, so as to improve the cycle and high-temperature storage flatulence of the silicon-based battery.

The invention provides a preparation method of titanium mine fireworks and the titanium mine fireworks. The preparation method of the titanium mine fireworks comprises the following steps: carrying out ball milling on lepidolite lithium extraction tailings until the particle size is less than or equal to 20 microns to obtain a tailing powder material; the tailing powder is immersed in a lithium nitrate solution for lithium enrichment treatment, and filter residues are filtered and collected; drying the filter residues to obtain lithium-enriched tailing powder; and under the protection of inert gas, 30-50 parts of lithium-enriched tailing powder, 25-35 parts of potassium nitrate, 15-25 parts of titanium powder or magnesium-aluminum alloy powder, 5-10 parts of nano iron oxide and 2-4 parts of hydroxypropyl methyl cellulose are mixed, and the titanium mine firework medicament is obtained. In the application, the lepidolite lithium extraction tailings replace part of titanium powder and sulfur, so that the emission of heavy metals and sulfur oxides is reduced, the pollution to the environment is reduced, and the environmental protection requirement is met. Silicon dioxide and aluminum oxide in the tailings are used as inert fillers to be doped into the fireworks, so that the consumption of raw materials is reduced, the sensitivity of the medicament is reduced, and the safety is enhanced.

The present invention relates to an electrolyte for a lithium-sulfur battery, and a lithium-sulfur battery comprising the same, the electrolyte comprising: a first solvent comprising a heterocyclic compound comprising at least one double bond and simultaneously comprising an oxygen atom or a sulfur atom; a second solvent comprising at least one of an ether-based compound, an ester-based compound, an amide-based compound, and a carbonate-based compound; a lithium salt; lithium nitrate; and a borate-based lithium salt.

The invention relates to a novel lithium metal battery ether electrolyte and a preparation method thereof, the electrolyte comprises the following components: a non-aqueous organic solvent system, a lithium salt and an additive, the non-aqueous organic solvent system is preferably selected from ethylene glycol dimethyl ether and 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether; the additive is preferably selected from lithium nitrate, lithium difluoro (oxalato) borate, tris (pentafluorophenyl) borane and pentafluorophenoxy cyclotriphosphazene; the lithium salt comprises at least one of lithium bis (fluorosulfonyl) imide, lithium bis (trifluoromethylsulfonyl) imide, lithium difluoro (oxalato) borate, lithium hexafluorophosphate and lithium tetrafluoroborate; the invention also provides a preparation method of the electrolyte and a battery formed by the electrolyte. The electrolyte provided by the invention realizes low impedance, high conductivity and long cycle life while maintaining high energy density, and provides an effective solution for safe and reliable operation of a metal lithium battery under harsh working conditions of high surface capacity, high current density and the like.

The present invention belongs to the technical field of lithium-ion batteries, and discloses a mixed lithium salt electrolyte, a preparation method thereof and an application thereof. The mixed lithium salt electrolyte of the present invention comprises the following raw materials: an electrolyte lithium salt, an inorganic lithium compound additive, an organic additive and a carbonate solvent. By adding an inorganic lithium additive mixed with 4 lithium compounds to the electrolyte of the existing lithium-ion battery, the present invention can play a role in efficient film formation, and the high-entropy system formed by these 4 lithium compounds can promote the dissolution of some lithium salts with low solubility, such as lithium nitrate LiNO3. In addition, the weaker solvation effect caused by the higher disorder of the system leads to the improvement of lithium ion kinetics, and the existence of the anion solvation structure can promote the rapid formation of a stable interface on the electrode surface at low temperature, thereby effectively improving the performance of the battery.

The invention belongs to the technical field of lithium ion battery electrolyte, and particularly relates to high-voltage electrolyte for a fast-charging lithium ion battery as well as a preparation method and application of the high-voltage electrolyte. Comprising the following substances: a main solvent, which comprises diethyl carbonate (DEC), dimethyl carbonate (DMC) and ethylene carbonate (EC); the diluent is 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether (HFE), and the diluent is 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether (HFE); lithium hexafluorophosphate (LiPF6); the film-forming additive is LiDFOB lithium difluoro (oxalato) borate; a film forming additive tri (trimethylsilyl) phosphate TMSP; and lithium nitrate LiNO3. The method provided by the invention is simple and easy to implement and low in cost, and the obtained electrolyte shows excellent specific capacity, charge-discharge cycle stability and rate capability as an electrode material of a lithium ion battery and a sodium ion battery.

The present invention provides a multi-level porous micro-nanostructured lithium-rich manganese-based positive electrode material and a preparation method thereof. First, lithium nitrate, manganese nitrate, cobalt nitrate, nickel nitrate, organic fuel, and organic carbon source are dissolved in deionized water to obtain a uniform mixed solution. Then, the mixed solution is atomized to form carbon-containing droplets. Nitrogen is used as a protective gas and a carrier gas to cause the carbon-containing droplets to undergo a self-propagating combustion reaction at a certain ignition temperature to obtain a combustion product powder; the combustion product is placed in a crucible and calcined in an inert atmosphere to obtain a calcined powder; the calcined powder is placed in a crucible and calcined in an air atmosphere to remove carbon; the calcined product is fully ground to obtain a multi-level porous micro-nanostructured lithium-rich manganese-based positive electrode powder. The present invention obtains a multi-level porous micro-nanostructured lithium-rich manganese-based positive electrode material with both micropores and mesopores, which can effectively prolong the cycle stability of the lithium-rich manganese-based positive electrode material. The present invention has a simple process, low energy consumption, low price, high capacity retention rate, and good industrial application prospects.