232 results about "Lithium manganese oxide" patented technology

The invention relates to a surface-modified lithium-rich manganese oxide material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion battery positive electrode materials. The material comprises a layered lithium-rich manganese oxide substrate and layered spinel heterostructures uniformly distributed on the surface of the lithium-rich manganese oxide substrate, the spinel heterojunction is one or two of LiMn2O4 and Li4Mn5O12, and the thickness of the spinel heterojunction is 5 nm to 10 nm; the surface of the modified lithium-rich manganese oxide material also contains an oxygen vacancy structure. Benefited from the existence of the heterostructure and the oxygen vacancy structure, the material disclosed by the invention has relatively high capacity and rate capability; in the electrochemical cycle process, release of oxygen, interface side reaction and irreversible phase change of a layered phase, a spinel phase and a rock salt phase are all inhibited. The lithium ion battery assembled by using the material as a positive electrode has high first-circle coulombic efficiency, and the problem of capacity fading in circulation is also relieved.

The invention belongs to the technical field of lithium batteries, and particularly relates to a lithium manganate positive electrode material, a preparation method thereof and a lithium battery, and the method comprises the following steps: adding a manganese sulfate solution, a precipitator and a complexing agent into a reaction kettle in a parallel flow manner, reacting under a first preset reaction condition, and introducing a first oxidant while reacting to obtain a mixed solution; concentrating the mixed solution to preset solid content, and adding a curing agent for curing reaction to obtain manganous-manganic oxide slurry; adding a manganese sulfate solution, a precipitant and a complexing agent into the reaction kettle in a parallel flow manner again, reacting with the manganous-manganic oxide slurry under a second preset reaction condition, introducing a second oxidizing agent while reacting to obtain a composite manganese oxide mixed solution, and filtering, washing and drying to obtain a composite manganese oxide; the composite manganese oxide and lithium carbonate are mixed, calcined, crushed and graded to obtain the lithium manganate positive electrode material, so that the electrochemical performance of the lithium manganate positive electrode material is improved.

The invention provides a lithium-rich manganese-based positive electrode material, a preparation method thereof and a lithium ion battery, and relates to the field of lithium ion batteries. Comprising a base body, a first coating layer and a second coating layer, the chemical general formula of the matrix is LiaNixCoyMnzMwO (1 + a-b) Rb, M comprises one or more of Al, Mg, Mn, Zr, Ti, W, Nb, Ta, Te, Na, La and Sr, R comprises one or more of Cl, N and S, 1.2 < = a < = 1.4, 0 < = b < = 0.1, 0.25 < = x < = 0.4, 0 < = y < = 0.1, 0.6 < = z < = 0.75, 01t, and 0 < = y < = 0.1. W < = 0.02, and x + y + z + w = 1; the first coating layer comprises spinel phase and / or spinel-like phase lithium manganese oxide; the second coating layer includes a Y-containing compound. And the cycling stability and the ionic conductivity of the lithium-rich manganese-based positive electrode material can be effectively improved.

The invention discloses a high-performance lithium-rich manganese oxide positive electrode material, a preparation method thereof and application of the high-performance lithium-rich manganese oxide positive electrode material to an all-solid-state battery. The lithium-rich manganese oxide positive electrode material coats / composites a lithium-rich manganese positive electrode base material and a lithium ion conductor or a conductive agent in situ through a freeze-drying method. In-situ coating / compounding of a lithium ion conductor or a conductive agent on the lithium-rich manganese oxide positive electrode material is realized through freeze drying, the interface impedance is effectively reduced, the interface stability is improved, and the lithium ion and electron transmission efficiency is improved. The lithium-rich manganese oxide positive electrode material prepared by the invention can inhibit the release and side reaction of lattice oxygen in the cycle process, and improve the structural stability and cycle life of the material; meanwhile, the freeze-drying method can maintain the nano dispersity and uniformity of the material, full solid-solid contact between the lithium-rich manganese material and a lithium ion conductor or a conductive agent is realized, and the high specific capacity of the lithium-rich manganese positive electrode material in all-solid-state battery application is ensured. The prepared lithium-rich manganese-based all-solid-state battery has the reversible specific capacity as high as 273 mAh / g, the bottleneck that the capacity release of the lithium-rich manganese oxide positive electrode material in an all-solid-state battery system is limited is broken through, the strategy provides a new design thought and technical path for the construction of the high-specific-energy all-solid-state battery positive electrode material, the adopted process is simple and controllable, and the method is suitable for industrial production. The method is suitable for large-scale preparation.

The invention discloses a La < 3 + >-doped lithium manganese oxide lithium ion sieve as well as a preparation method and application thereof, and belongs to the technical field of salt lake lithium extraction. The preparation method comprises the following steps: by taking Mn2O3 and LiOH as raw materials, carrying out hydrothermal reaction to generate LiMnO2, mixing the LiMnO2 with La2O3, grinding and calcining to form a La < 3 + >-doped spinel structure precursor La-LMO, and carrying out acid pickling to prepare La-HMO. La < 3 + > replaces part of Mn < 3 + >, the average valence state of manganese is improved, meanwhile, the structural stability of the manganese is enhanced through the high bond energy of La-O bonds, the number of exposed manganese atoms is reduced, manganese solution loss caused by Mn < 3 + > disproportionation reaction in the acid treatment process is effectively inhibited, the adsorbed oxygen content and active sites are increased, and the lithium ion adsorption capacity is remarkably improved. The material has high-selectivity adsorption capacity on lithium ions in salt lake brine in a strong alkaline environment, the manganese solution loss rate is obviously lower than that of traditional HMO, the cycle life is remarkably prolonged, and the industrial application potential is remarkably improved. The preparation process of the lithium ion sieve is simple, the raw material cost is low, and the technical bottlenecks that an existing manganese-based lithium ion sieve is poor in structural stability and high in manganese solution loss are solved.

The lithium-ion battery provided comprises a separator, a cathode electrode, an anode electrode, and an electrolyte, wherein a coating of the cathode electrode comprises a cathode material; the cathode material comprises a cathode active material, a conductive agent, and a binder; the cathode active material comprises at least one selected from the group consisting of lithium iron phosphate and lithium manganese oxide. The coating of the cathode electrode further comprises an anode SEI layer-forming additive; and / or, the electrolyte comprises an anode SEI layer-forming additive; the anode SEI layer-forming additive comprises at least one selected from the group consisting of elemental sulfur and a metal sulfide. The electrolyte comprises a SEI layer-forming solvent. The lithium-ion battery provided in the present disclosure can effectively improve the cycling performance of lithium-ion batteries using lithium iron phosphate or lithium manganese oxide as a cathode active material.

The invention provides a positive electrode material and a preparation method thereof, a battery and an electric device. The positive electrode material comprises a substrate and a coating layer, the coating layer coats at least one part of the surface of the substrate, the substrate comprises spinel lithium manganese oxide and layered lithium manganese oxide distributed on the surface layer of the spinel lithium manganese oxide, the chemical formula of the layered lithium manganese oxide comprises LicMndOe, c is greater than or equal to 1 and less than or equal to 3, c / d is greater than 0.5, (2e-c) / d is greater than or equal to 3 and less than or equal to 4, and the coating layer comprises a solid electrolyte.

The invention belongs to the field of preparation of a lithium ion battery positive electrode material, and particularly relates to high-voltage type single crystal lithium manganate, a preparation method and application of the high-voltage type single crystal lithium manganate. According to the scheme, a manganese source compound, a lithium source compound and a transition metal oxide are mixed according to the molar ratio of 1: (0.5-0.6): (0.1-0.3), deoxidized and sintered, and a single-crystal lithium manganate intermediate product is obtained; and preparing a finished product by taking the obtained intermediate product as a raw material. The deoxidation sintering operation comprises the steps of heating from room temperature to 800-1000 DEG C at a heating rate of 20-30 DEG C / min, keeping the temperature for 2-6 hours, not carrying out heat preservation operation in the heating process, cooling to 400-500 DEG C at a cooling rate of 50-100 DEG C / h after the constant temperature stage is ended, and keeping the temperature for 2-4 hours, so as to prepare the high-voltage type single crystal lithium manganate positive electrode material. According to the scheme, the capacity and the high-temperature cycle performance of the lithium manganate material can be remarkably improved and the expansion rate of the battery can be inhibited under the cooperation of the doping elements with rapid heating, gradient cooling and radius matching. Meanwhile, the invention also provides an application of the high-voltage single-crystal lithium manganate positive electrode material in a battery.

The invention relates to a preparation method and application of a lithium-rich manganese oxide positive electrode material with high capacity and long cycle stability, and the method comprises the following steps: mixing lithium acetate dihydrate, nickel acetate tetrahydrate, cobalt acetate tetrahydrate, manganese acetate tetrahydrate and citric acid monohydrate, adding into deionized water, uniformly stirring, adding oleic acid to prepare a precursor solution, and carrying out spray drying to prepare a precursor material; and carrying out heat treatment on the precursor material in an air atmosphere to prepare the lithium-rich manganese oxide positive electrode material Li < 1.2 > Ni < 0.13 > Co < 0.13 > Mn < 0.54 > O < 2 > with high capacity and long cycle stability. The lithium-rich manganese-based positive electrode material has the advantages that the lithium-rich manganese-based positive electrode material compositely modified by oleic acid and citric acid is simple in process, a spinel phase with high lithium ion conductivity is generated, and the lithium-rich manganese-based positive electrode material has high specific capacity and excellent cycle performance under high current density when being applied to a positive electrode of a lithium ion battery.

The invention belongs to the field of resource recycling, and particularly relates to a method for preparing a lithium iron manganese phosphate positive electrode material from a waste lithium manganate battery positive electrode material. The waste lithium manganate battery is discharged, roasted, disassembled and ground to obtain the lithium manganate positive electrode material. The method comprises the following steps: adding dilute phosphoric acid and ascorbic acid into a lithium manganate positive electrode material to carry out synergistic acid leaching reaction, carrying out suction filtration to obtain filtrate containing manganese, lithium and phosphorus, adjusting the pH of the filtrate to form manganese-containing precipitate and lithium-containing filtrate, adjusting the pH of the lithium-containing filtrate, and carrying out evaporation concentration to obtain lithium-containing precipitate. And carrying out solid-phase grinding on the manganese precipitate, the lithium precipitate, carbon, iron and phosphorus, and carrying out high-temperature roasting to obtain the lithium ferric manganese phosphate positive electrode material. The method has the advantages of low cost, simple process, high recovery rate and the like, and solves the problem of recycling of the waste lithium manganate battery.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to lithium battery positive electrode slurry and a preparation method thereof.The slurry is composed of a lithium-manganese-rich layered oxide positive electrode material, a conductive agent, a water-based binder, deionized water and a functional additive lithium difluorophosphate. The stability of the slurry in the preparation and coating process is ensured, and meanwhile, the electrochemical performance of a pole piece in the later period is also improved. The preparation method comprises the following steps: adding a water-based binder into deionized water to form a binder glue solution; adding the lithium-rich manganese oxide positive electrode material, conductive carbon black SuperP and lithium difluorophosphate into the binder glue solution to prepare slurry; uniformly stirring the slurry by using a defoaming stirrer, and adding a solvent to adjust the concentration of the slurry. A stable interface layer can be formed on the surface of an active substance, so that the battery internal resistance is improved, the rate capability is improved, the cycle life is prolonged, the long-term stability of the battery can be remarkably enhanced, and the method is suitable for large-scale industrial application of the lithium ion battery.

This application provides a lithium-rich manganese-based cathode material, its preparation method, and a lithium-ion battery, relating to the field of lithium-ion batteries. It includes a substrate and a first coating layer and a second coating layer sequentially stacked on the surface of the substrate; the substrate has the general chemical formula Li. a Ni x Co y Mn z M w O (1+a‑b) R b Wherein, M includes one or more of Al, Mg, Mn, Zr, Ti, W, Nb, Ta, Te, Na, La, and Sr, R includes one or more of Cl, N, and S, 1.2≤a≤1.4, 0≤b≤0.1, 0.25≤x≤0.4, 0≤y≤0.1, 0.6≤z≤0.75, 0

The invention provides a multi-element lithium supplement agent and a preparation method thereof, a positive pole piece and a lithium ion battery, the multi-element lithium supplement agent comprises an inner core, a first coating layer and a second coating layer, the inner core comprises lithium-rich lithium aluminum ferrite, the first coating layer comprises lithium-rich lithium manganate, and the second coating layer comprises lithium-rich lithium nickelate; the chemical general formula of the multi-element lithium supplement agent is LixFeaAlbMncNidOy, 0.1 < = d / (a + b) < = 0.9, 0.62 < = a < = 0.96, 0.04 < = b < = 0.38, 0.005 < = c / (a + b) < = 0.02, 5a + 5b + 2c + 2d < = x < = 5.5 a + 5.5 b + 2.1 c + 2.1 d, and y = (x + 3a + 3b + 4c + 2d) / 2. Iron and aluminum are adopted as main elements, and lithium-rich lithium manganate and lithium-rich lithium nickelate are coated at the same time, so that the stability of the lithium supplementing agent can be improved, gas production can be reduced, the ionic conductivity can be improved, and the capacity exertion of the lithium supplementing agent can be promoted.

The invention discloses a method for preparing high-purity lithium sulfide by recycling a waste lithium ion battery positive electrode material. The method comprises the following steps: selectively leaching lithium from lithium manganate, lithium iron phosphate and a waste ternary positive electrode material; the lithium-rich lixivium is subjected to precipitation, purification and impurity removal, and a high-purity lithium sulfate refined solution is obtained; drying the high-purity lithium sulfate refined liquid to obtain anhydrous lithium sulfate; mixing and ball-milling anhydrous lithium sulfate and carbon powder to obtain a first precursor; carrying out high-temperature calcination on the first precursor in an inert gas atmosphere to obtain a second lithium sulfide precursor; dissolving, evaporating and crystallizing the second precursor to obtain a lithium sulfide intermediate; and crushing the lithium sulfide intermediate, and carrying out secondary sintering to obtain the high-purity lithium sulfide. The preparation method is simple, lithium is selectively extracted from the positive electrode material of the waste lithium ion battery, the loss of lithium ions is reduced, the preparation cost of lithium sulfate is reduced by adopting the high-purity lithium sulfate filtrate, the method is simple in process, and the purity of the obtained lithium sulfide can reach 99.5% or above.

The invention provides a preparation method and application of a lithium manganese iron phosphate composite material, and the preparation method comprises the following steps: (1) mixing a manganese source, an iron source, a phosphorus source, lithium carbonate, glucose and a dopant in proportion, sanding and spraying to obtain a yellow material; dividing the yellow material into two parts, respectively sintering and mixing at high temperature and low temperature to obtain a mixed sintered material; (2) mixing the mixed sintered material, a carbon source and an additive according to a ratio, sanding, spraying and sintering to obtain a lithium manganese iron phosphate sintered material; and (3) uniformly mixing the lithium manganese iron phosphate sintered material and lithium manganate, and carrying out secondary sintering to obtain the lithium manganese iron phosphate composite material. The whole preparation process is simple, the raw material utilization rate is high, byproducts or material waste is avoided, and the method has good industrialization prospects.

The invention discloses a manganese adsorbent and a preparation method thereof.The preparation method comprises the following preparation steps that S1, waste lithium manganate positive electrode powder reacts with reducing acid, and after metal impurities are removed, a Li-Mn mixed solution is obtained; s2, adding a structure-directing agent into the Li-Mn mixed solution to generate a lithium ion sieve precursor; and S3, etching the lithium ion sieve precursor, and acidifying to obtain the manganese adsorbent. According to the manganese adsorbent, the waste lithium manganate battery pole pieces are used as preparation raw materials, the problem of recycling of the waste lithium manganate batteries can be solved, meanwhile, the raw materials of the manganese adsorbent are saved, and a new solution thought is provided for green chemistry and a salt lake lithium extraction technology.

To provide a lithium secondary battery which has excellent charge-discharge cycle characteristics at high temperatures, while having low resistance and excellent output characteristics.SOLUTION: Provided are: spinel-type lithium manganese which contains phosphate and is represented by the chemical formula Li1+XMn2-X-YMYO4 (where 0.02≤X≤0.20, 0.05≤Y≤0.30, and M represents Al or Mg), in which the pore volume of pores having a pore diameter of 0.6 μm or less is from 0.003 cm3 / g to 0.2 cm3 / g inclusive and the relative standard deviation of the secondary particle diameters is from 25% to 45% inclusive; a method for producing the spinel-type lithium manganese; and a use of the spinel-type lithium manganese.SELECTED DRAWING: None

The invention discloses a preparation method and application of hollow lithium manganate microspheres based on a sound-induced microbubble template, and belongs to the field of lithium ion batteries. The method comprises the following steps: dissolving a surfactant in deionized water to prepare a surfactant solution with the concentration of 1-2g / L; high-power ultrasonic waves are applied to the surfactant solution, micron-sized bubbles are generated in the surfactant solution, and microbubble template liquid is obtained; adding manganese salt and an oxidizing agent into the microbubble template liquid under the continuous action of ultrasound, so that the manganese salt is oxidized at a gas-liquid interface of the micron-sized bubbles to form a hollow manganese dioxide precursor; centrifugally collecting, washing and drying to obtain hollow manganese dioxide microspheres; the hollow manganese dioxide microspheres and a lithium source are uniformly mixed and then subjected to segmented heat treatment, and the hollow lithium manganate microspheres are obtained after natural cooling, so that the problems that the template removal step is tedious, impurities are possibly introduced, the temporary template stability is poor, and the size distribution is non-uniform are solved.

This invention belongs to the field of battery technology, specifically disclosing a lithium-rich manganese oxide cathode material with excellent comprehensive performance, its preparation method, and its applications. The lithium-rich manganese-based cathode material provided by this invention has the chemical formula Li. 1.26 Ni 0.074+0.5x Co 0.074+0.5x Mn 0.593‑x O2, where x = 0.06–0.15, with a fixed total transition metal content, by simultaneously increasing Ni and Co while decreasing Mn content, not only is the capacity contribution of the transition metals significantly improved, enhancing electron and ion transport, but a spinel layer is also formed on the surface, reducing transition metal dissolution. At x = 0.09–0.15, the material exhibits a large (003) interplanar spacing, resulting in better rate performance. At x = 0.09, the lithium-rich manganese oxide cathode material of this invention demonstrates excellent comprehensive performance, with significantly improved specific capacity and cycle stability. At a current density of 0.1C, the initial discharge specific capacity reaches 296 mAh / g, and after 500 cycles at 1C, the capacity retention rate is as high as 90.47%, and the voltage retention rate is as high as 79.08%.

The present invention relates to a positive electrode active material and comprises a first lithium-excess manganese oxide in single-particle form and a second lithium-excess manganese oxide in secondary-particle form, wherein the first lithium-excess manganese oxide and the second lithium-excess manganese oxide simultaneously contain a Li2MnO3 phase and a LiMO2 phase (where M is an element comprising one or more elements selected from Ni, Co, and Mn), and the first lithium-excess manganese oxide has a larger average particle size (D) than the second lithium-excess manganese oxide. 50 The present invention relates to a bimodal type positive electrode active material having a small ) and a weight ratio of 1:1.5 to 8 between the first lithium-excess manganese oxide and the second lithium-excess manganese oxide, a positive electrode containing the same, and a lithium secondary battery.

The present disclosure relates to the technical field of battery manufacturing, and in particular relates to a lithium-ion battery. The lithium-ion battery comprises a separator, a cathode electrode, an anode electrode, and an electrolyte, wherein a coating of the cathode electrode comprises a cathode material; the cathode material comprises a cathode active material, a conductive agent, and a binder; the cathode active material comprises at least one selected from the group consisting of lithium iron phosphate and lithium manganese oxide. The coating of the cathode electrode further comprises an anode layer-forming additive; and / or, the electrolyte comprises an anode layer-forming additive; the anode layer-forming additive comprises at least one selected from the group consisting of elemental sulfur and a metal sulfide. The electrolyte comprises a layer-forming solvent. The lithium-ion battery provided in the present disclosure can effectively improve the cycling performance of lithium-ion batteries using lithium iron phosphate or lithium manganese oxide as a cathode active material.

An electrochemical device and an electronic device comprising the electrochemical device, the electrochemical device comprising a negative electrode tab and a positive electrode tab, the negative electrode tab comprising a negative electrode active material layer, the negative electrode active material layer comprising a negative electrode active material, the positive electrode tab comprising a positive electrode active material layer, the positive electrode active material layer comprising a positive electrode active material, the positive electrode active material comprising a lithium manganese oxide; when the SOC of the electrochemical device is 15%, the lattice parameter of the lithium manganese oxide has good high-temperature storage performance and cycle performance.

The present disclosure provides a positive electrode plate and a lithium-ion battery using the positive electrode plate. The positive electrode plate includes a current collector and a positive electrode active material layer. The positive electrode active material layer includes a first active material layer and a second active material layer, both of which are provided in a composite manner. The first active material includes a lithium manganese oxide spinel material and a ternary material, and the second active material layer includes a phosphate material; single crystal sizes of the lithium manganese oxide spinel material and the ternary material are D1 and D2, respectively, which meet a condition D2≥3.2*D1.

The invention discloses a method for preparing a manganese lithium ion sieve by using ozone, which comprises the following steps of: introducing ozone into a solution containing bivalent manganese salt and lithium salt, reacting to obtain a lithium manganese oxide intermediate LiMnO2, and calcining and annealing the lithium manganese oxide intermediate to obtain a manganese lithium ion sieve precursor. The manganese-series lithium ion sieve precursor is subjected to lithium removal transformation in an acid solution to obtain the manganese-series lithium ion sieve, and the manganese-series lithium ion sieve can be used for selectively adsorbing lithium ions from a lithium-containing solution. According to the method, dangerous strong oxidants such as potassium permanganate, hydrogen peroxide and persulfate can be prevented from being used, and the effects of safety, energy conservation and cost reduction are achieved.

The invention relates to the technical field of battery diaphragm winding, and discloses a lithium manganate battery diaphragm winding frame convenient for winding production, which comprises a fixed plate, supporting legs fixedly mounted at the bottom of the fixed plate, a vertical plate fixedly mounted at the top of the fixed plate, and a processing assembly arranged on the side wall of the fixed plate, the machining assembly comprises an adjusting mechanism installed on the side wall of the fixing plate, the adjusting mechanism is located on the left side of the top of the fixing plate, and a winding mechanism is installed on the top of the fixing plate. The device solves the problems that an existing device pushes a sliding block to move through a fixing bolt, the position of a sleeve is effectively limited under the action of a connecting rod, and since diaphragms adopted by batteries of different specifications are different, the length and the position of the sleeve are different, and the service life of the sleeve is prolonged. And the device is difficult to adjust the position of the connecting rod according to the length of the sleeve, so that the device has certain limitation.

The invention discloses a lithium manganate positive electrode material, a preparation method and an applied lead-lithium battery, relates to the technical field of lithium manganate positive electrode materials, and solves the problems that the existing lithium manganate positive electrode material is poor in structure and interface stability and poor in rate and cycle performance. The positive electrode material is composed of a lithium manganate matrix and a double-layer composite coating, the matrix is prepared by taking lithium carbonate and manganous-manganic oxide as raw materials and doping magnesium hydroxide, aluminum hydroxide and titanium dioxide multi-plasma phase; the lithium manganate positive electrode material is prepared by uniformly compounding a lithium manganate matrix modified by a spinel inner layer, vinyl functionalized MOF and a polyvinylidene fluoride-hexafluoropropylene copolymer on the surface of an aluminum foil receiver through an electrospinning-electrospray synergistic process. The material is applied to the lead-lithium battery, shows excellent electrochemical performance and has good practical application value.

An embodiment of the present invention provides an electrode for a secondary battery, and a lithium secondary battery, the electrode including an electrode current collector and an electrode layer formed on one surface or both surfaces of the electrode current collector, wherein the electrode layer includes a lithium-based active material including: an over-lithiated manganese-based oxide in which a molar ratio of lithium to transition metals other than lithium is more than 1 and a molar content of manganese in the transition metals is 50 mol % or more; and a coating layer formed on a surface of the over-lithiated manganese-based oxide, and the coating layer includes Co in an amount of 3000 ppm to 8000 ppm on the basis of the total weight of the lithium-based active material.

This invention relates to the field of high-entropy lithium manganese oxide cathode materials, specifically to a method for preparing high-entropy lithium manganese oxide cathode materials. This method addresses the problems of short cycle life, poor structural stability, and inadequate rate performance in traditional lithium manganese oxide cathode materials due to Jahn-Teller distortion and manganese leaching. The method involves ball milling a manganese source, lithium salt, and dopant ions M to obtain a mixture, followed by sintering in a muffle furnace, cooling, grinding, and sieving to obtain a lithium manganese oxide matrix material. The lithium manganese oxide matrix material and a silane-containing triphenylmethane-structured polyimide are then ball milled, coated with a low-temperature heat treatment solution, cooled, and sieved to obtain the high-entropy lithium manganese oxide cathode material. This high-entropy lithium manganese oxide cathode material exhibits high cycle stability, excellent rate performance, and good high-temperature safety, making it suitable for high-performance lithium-ion batteries.

This application relates to a secondary battery and an electronic device. Specifically, this application provides a secondary battery comprising: a positive electrode, a negative electrode, and an electrolyte. The positive electrode includes a positive electrode current collector and an insulating layer and a positive electrode material layer disposed on the positive electrode current collector. The insulating layer comprises boehmite, the positive electrode material layer comprises lithium iron phosphate and lithium manganese oxide, the lithium iron phosphate comprising zirconium and boron, and the lithium manganese oxide comprising antimony. The electrolyte comprises lithium difluorophosphate. This application not only improves the float charging safety of the secondary battery but also reduces the particle breakage rate.