167 results about "Manganese phosphate" patented technology

The application discloses a Fe self-catalytic in-situ lithium supplementing and graphite carbon-coated lithium manganese iron phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of lithium batteries. 2+ Catalyze PAN to generate sp 2 Carbon, LiBOB-Li2O microcapsule in-situ lithium supplementing, and then ultra-high speed quenching to obtain the product. 2+ Self-catalysis, integration of carbon coating and in-situ lithium supplementing, greatly improving the conductivity, the first charge-discharge efficiency and the rate performance of the material, simple and controllable process, suitable for industrial production, and the prepared material has high compacted density and excellent cycle stability.

The application provides a lithium ion battery. The lithium ion battery comprises a positive electrode sheet, the positive electrode sheet comprises a positive electrode active material, the positive electrode active material comprises lithium iron manganese phosphate, the surface of the lithium iron manganese phosphate comprises aluminum oxide, the weight percentage content a of manganese elements in the positive electrode sheet, the peak area b of a characteristic peak corresponding to an aluminum oxide (440) crystal face in an XRD characterization spectrum of the positive electrode sheet, and the half-peak width c of a (020) crystal face corresponding to 2theta=17° in the XRD characterization spectrum of the positive electrode sheet satisfy the following formula (I): 0.14<= (a* c* 1000) / b <= 0.95, wherein the unit of b is Counts°, and the unit of c is °. The quantitative relationship can effectively balance the electrochemical stability and the kinetic performance of the positive electrode sheet, effectively alleviate the inherent gas production problem of the lithium iron manganese phosphate battery system, and improve the fast charging performance and the cycle stability of the lithium ion battery.

The application provides a positive electrode sheet, a battery and an electric device. The positive electrode sheet comprises a positive electrode current collector and a positive electrode active layer, the positive electrode active layer comprises a nickel-cobalt-manganese ternary material and a manganese iron lithium phosphate material; the X-ray crystal diffraction spectrum of the positive electrode sheet comprises a first characteristic peak with a 2θ angle of 18.67±0.5° and a second characteristic peak with a 2θ angle of 35.58±0.5°, the peak intensity of the first characteristic peak is I1, and the peak intensity of the second characteristic peak is I2; wherein, 13≤I1 / I2≤30, and the mass percentage of Mn 2+ Mn 2+ 4+ Mn 4+ in the positive electrode sheet satisfies 22%≤W Mn 2+ Mn 4+ ≤62%. The positive electrode sheet of the application has high energy density, good cycle performance and rate performance, and low material cost when applied in a battery.​​​​

This invention belongs to the field of battery active materials technology, specifically disclosing a lithium manganese iron phosphate composite material, its preparation method, and a secondary battery. The lithium manganese iron phosphate composite material includes a core and a first coating layer (carbon layer) and a second coating layer (fast ion conductor layer) sequentially covering the core from the inside out; the core comprises lithium manganese iron phosphate material LiFe. x Mn 1‑x D y PO4, 0 < x < 1, 0 ≤ y ≤ 0.1, D is the doping element; the fast ion conductor layer includes the fast ion conductor Li. a M b A c O d X e M represents titanium and / or zirconium, A represents nitrogen and / or phosphorus, and X represents at least one of fluorine, chlorine, bromine, or iodine, where 1 ≤ a ≤ 4, 0 ≤ b ≤ 5, 0 ≤ c ≤ 3, 0 ≤ d ≤ 12, and 0 ≤ e ≤ 2. This invention improves the structural stability and conductivity of lithium manganese iron phosphate by coating it with a fast ion conductor and a carbon bilayer, thereby enhancing the cycle life and rate performance of secondary batteries.

The application belongs to the technical field of lithium battery cathode material preparation, and relates to a method for recycling and preparing lithium manganese iron phosphate and the lithium manganese iron phosphate. First, recycled lithium iron phosphate black powder, a manganese source and deionized water are uniformly mixed according to a proportion, a precipitant is added in the process, the mixed slurry is filtered after synthesis is completed, and the filter cake is dried to obtain a solid product; the solid product is placed in a calcining furnace for first sintering to obtain a precursor 1; then the precursor 1 is mixed with a phosphorus source, a lithium source and a carbon source according to an element proportion, sand grinding and spray granulation are performed under deionized water as a solvent to obtain a precursor 2; the precursor 2 is placed in an atmosphere furnace for second sintering, and lithium manganese iron phosphate cathode material is obtained after crushing, screening and iron removal. The raw material of the application is recycled material, which is low in price and can reduce the recycling cost; the prepared lithium manganese iron phosphate material is excellent in processing and electrical performance, and the process and operation are easy to be industrialized for large-scale production.

The present disclosure relates to the technical field of batteries, and specifically to a lithium-ion battery and an electrical apparatus. The lithium-ion battery comprises a positive electrode plate, a negative electrode plate, a separator, and an electrolyte; the positive electrode plate comprises a positive electrode film layer; the positive electrode film layer comprises a positive electrode active material; the positive electrode active material comprises at least one of lithium iron phosphate and lithium manganese iron phosphate; the electrolyte comprises an organic solvent, an electrolyte salt, and an additive; the additive comprises a compound represented by formula (I).

This invention relates to positive electrode active materials, electrodes, and batteries. The positive electrode active material comprises olivine-type lithium manganese iron phosphate, wherein the olivine-type lithium manganese iron phosphate contains a first dopant at a phosphorus site and a second dopant at an oxygen site, wherein the first dopant at the phosphorus site has a valence of +4 and a coordination number of 4, and wherein the second dopant at the oxygen site has a valence of -1.

This application provides a positive electrode active material, a secondary battery, and an electrical device. The positive electrode active material includes: an active core comprising lithium manganese iron phosphate; a first coating layer disposed on the surface of the active core, the first coating layer comprising a carbide; and a second coating layer disposed on the surface of the first coating layer, the second coating layer comprising an oxide. This application, through a specific coating treatment of the lithium manganese iron phosphate core as the positive electrode active material, produces secondary batteries with the following characteristics: a cycle life of over 1900 cycles at 25℃@80%SOH, a thermal diffusion time of over 190 min, and a rate performance of over 80%.

This invention provides a method for preparing ferrous manganese phosphate, comprising mixing an iron source, a manganese source, and phosphoric acid, adding a phosphorus source, controlling the pH value to 3.0-4.0, and preparing a mixed solution; then adding an ammonia solution A to a reaction vessel, and simultaneously adding the mixed solution A and ammonia solution B dropwise under an inert gas atmosphere, controlling the pH value throughout the reaction process to (7.5-8.0) ± 0.1, and co-precipitating to obtain ferrous manganese phosphate. The ferrous manganese phosphate prepared by this invention has uniform Mn, Fe, and P content and stable ratio.

A cathode material, its preparation method, and a lithium-ion battery are disclosed, belonging to the field of secondary batteries. The cathode material includes a lithium manganese iron phosphate core and a carbon coating covering at least a portion of the surface of the lithium manganese iron phosphate core. The sphericity of the cathode material is ≥0.9, and the particle size distribution is 1≤Span≤3. In the XRD pattern of the cathode material, the intensity ratio of the diffraction peaks of the (020) crystal plane to that of the (200) crystal plane is I. (020) / I (200) ≥2.8, the grain size D calculated from the (020) crystal plane diffraction peak. （020） The wavelength ranges from 100nm to 210nm. These cathode materials can improve the rate performance of lithium-ion batteries.

The application discloses a carbon-coated manganese iron lithium phosphate composite material and a preparation method and application thereof, and relates to the technical field of battery materials. x Fe y M z PO4; wherein M comprises Re, Ti, Mo and Zr elements; 0.55<=x<=0.65, 0.35<=y=1-x-z<=0.45, 0.025<=z<=0.035. The application can improve ion conductivity, stability of crystal structure, interface dynamics and stability under high temperature and high pressure of the manganese iron lithium phosphate by doping the manganese iron lithium phosphate with Re, Ti, Mo and Zr elements.

The application provides a positive electrode sheet, a battery and an electric device. The positive electrode sheet comprises a lithium iron manganese phosphate material, the X-ray crystal diffraction spectrum of the positive electrode sheet comprises a characteristic peak of a (200) crystal face with 2θ of 17.2±0.5° and a characteristic peak of a (020) crystal face with 2θ of 29.7±0.5°; the average stacking size D(200) on the (200) crystal face, the average stacking size D(020) on the (020) crystal face and the average particle size D 平均 satisfy the following relationships: D(200) / D(020)≥1.15 and 10%≤D(200) / D 平均 ≤30%. The application makes the positive electrode sheet have high lithium ion diffusion rate and cycle stability by special crystal structure and particle size limitation, and further makes the battery have excellent cycle performance and rate performance.

The application provides a lithium manganese iron phosphate positive electrode material and a surface lithiumation compensation process thereof, and belongs to the technical field of new energy batteries. The compensation process comprises the following steps: providing a lithium manganese iron phosphate base material; constructing an interface stabilization layer on the surface of the base material, wherein the interface stabilization layer is a rare earth oxide layer; and constructing a composite functional layer on the interface stabilization layer, wherein the composite functional layer comprises carbon material and composite fluoride, and the composite functional layer simultaneously provides stress buffering and lithium ion conduction functions. The lithium ion battery prepared from the lithium manganese iron phosphate positive electrode material has a significant improvement in cycle life and rate performance, can meet the demand of new energy vehicles and energy storage for high-performance batteries, and has a wide market application prospect.

The present application relates to the technical field of lithium ion battery resource recycling and high value utilization, specifically relates to the process of generating, recycling or refining metal by electrolysis method, and discloses a method for synthesizing manganese ferrite magnetic material from waste manganese iron phosphate lithium positive electrode material: first, waste manganese iron phosphate lithium positive electrode powder is mixed with organic binder and solvent to form slurry, and then the slurry is coated on the surface of titanium mesh to obtain a positive electrode sheet; a blank titanium mesh is used as a negative electrode, and NaOH aqueous solution is used as an electrolyte to construct an electrolytic cell, and Li and P elements are leached by electrolysis; the electrolyte is concentrated, supplemented with phosphorus source, and adjusted in pH to recover lithium phosphate; the manganese iron / graphite remaining on the titanium mesh is separated by ultrasonic, and then acidized and dissolved; the graphite is removed by filtration; the filtrate is gelled with citric acid; and the manganese ferrite magnetic material is obtained by subsequent calcination. The method realizes efficient leaching of Li and P through electrochemical treatment, and simultaneously converts Mn and Fe into high-crystallinity manganese ferrite, which has the advantages of green low consumption and full-element closed-loop recycling.

This invention discloses a method for producing MnSO4-FeSO4 mixed crystals with a controllable manganese-iron atomic ratio using reduced mineral powder. This method allows new energy material companies to control raw materials and ensure product quality stability. The technology for producing MnSO4-FeSO4 mixed crystals with a controllable manganese-iron atomic ratio is of great significance for the production of lithium manganese iron phosphate products.

This invention discloses a method for modifying lithium manganese iron phosphate (LFP) cathode materials coated with MoS2 / NiO / TiO2. The first step involves preparing a precursor, nickel hydroxide. Nickel nitrate, sodium hydroxide, ammonium molybdate, and thiourea are mixed and stirred uniformly, then reacted in a polytetrafluoroethylene (PTFE) hydrothermal reactor to obtain MoS2 and NiO solid particles. The second step involves mixing MoS2, NiO, and tetrabutyl titanate uniformly, then adding potassium chloride and allowing the mixture to stand to obtain MoS2 / NiO / TiO2 composite particles. Finally, these composite particles are mixed with LFP particles and stirred to obtain the MoS2 / NiO / TiO2 coated LFP cathode material. The modified LFP exhibits increased conductivity, significantly improved specific capacity, rate performance, and stability. Its initial charge-discharge specific capacity reaches 153.8–156.7 mAh / g, and its specific capacity at 2C rate reaches 132.4–140.0 mAh / g. The modification method used in this invention has a simple preparation process and is the first to achieve the goal of improving electrical performance by constructing a MoS2 / NiO / TiO2 composite material on the surface of lithium manganese iron phosphate.

The application provides a positive electrode material and a preparation method thereof, a pole piece, a battery and an electrical equipment, and relates to the technical field of lithium batteries. The positive electrode material is a core-shell composite structure in which lithium iron manganese phosphate is taken as a core and a dopant coating layer is coated on the outer surface of the lithium iron manganese phosphate; the dopant coating layer comprises an alloy material and an ester-based quaternary ammonium salt; the alloy material is Fe y Si 1‑y alloy, wherein 10>y>1. The application coats the positive electrode material with the dopant coating layer composed of the Fe y Si 1‑y alloy, so that the performance and safety of the positive electrode material under low-temperature conditions are improved, the cycle stability and electrochemical performance of the material are enhanced, and a new solution is provided for the development of lithium ion battery technology.

The present application relates to the technical field of carbon composite materials, and particularly relates to a preparation method of a composite graphite crucible for sintering of a lithium iron manganese phosphate positive electrode material. The present application aims to solve the problems of poor thermal conductivity, easy thermal shock cracking and high-temperature deformation of traditional refractory castable crucibles. In the method, silica anchor points are constructed on the surface of dopamine site-modified single-walled carbon nanotubes and terminated with silane, and then the silica anchor points are compounded with phenolic resin and boric acid. Finally, the mixture is kneaded, hot-pressed and carbonized in batches with flake graphite of a specific particle size. The prepared composite graphite crucible significantly improves the thermal conductivity, structural stability and thermal shock resistance, optimizes the microstructure uniformity, thereby effectively reducing the sintering energy consumption and greatly prolonging the service life of the crucible in continuous production.

This invention discloses a method for preparing lithium manganese iron phosphate from waste zinc-manganese dry batteries and retired lithium iron phosphate batteries, comprising the following steps: The positive electrode active powder obtained from the recycling of waste zinc-manganese dry batteries is directly used as a manganese source; the black powder from retired lithium iron phosphate batteries reacts with ferric chloride solution to generate iron phosphate precipitate, which serves as an iron source and part of the phosphorus source in the synthesis of lithium manganese iron phosphate, while simultaneously achieving the recycling of iron solution in the filtrate and the enrichment and recovery of lithium. After batching, sand milling, and spraying, the raw materials are sintered in an inert atmosphere to obtain lithium manganese iron phosphate positive electrode material. The manganese extraction process does not require acid leaching pretreatment. According to this invention, the synergistic recovery of various valuable metal elements from waste batteries is achieved. The process is simple, the material has high crystal phase purity and uniform particle distribution, and exhibits good electrochemical performance and promising prospects for industrial application.

The application discloses a kind of double in-situ doped core-shell structure's lithium iron manganese phosphate positive electrode material and preparation method thereof, belong to lithium battery technical field.The application is through the multidimensional synergistic modification of core-shell structure, in-situ doping, double coating, realizes the comprehensive promotion of lithium iron manganese phosphate positive electrode material energy density, kinetics performance, cycle stability and interface compatibility, preparation process is simple and controllable, low in cost, suitable for industrial production, provide new technical scheme for the research and application of high-performance lithium iron manganese phosphate positive electrode material.

This invention discloses a non-stoichiometric sodium iron manganese phosphate cathode material with high phase purity. This sodium iron manganese phosphate cathode material has the following general chemical formula: zMPO4-Na x Fe y Mn a‑y (PO4)2(P2O7) / C, where 3.7≤x≤4.3, 1≤y≤2, 2.92≤a≤3, 0<z≤0.1, and the molar ratio of Na to transition metals Fe and Mn (TM) (Na / TM) is between 1.23 and 1.45, with M being Sc, Y, Ho, or Tb. Through non-stoichiometric design, controllable concentrations of sodium vacancies and interstitial Na are actively introduced into the crystal lattice. + Optimized Na + Transport; then by introducing phosphate MPO4 with zircon-type structure as a diffusion promoter, Mn enrichment is avoided and the formation of NMP impurity phase is reduced, and the phase purity of the material is ≥93%; the synergistic effect of the two greatly improves the capacity and rate performance of the material.

This invention discloses a method for preparing and applying boron ion-doped modified titanium manganese phosphate, belonging to the field of sodium-ion battery cathode material preparation technology. The method includes the following steps: dissolving a carbon source, a sodium source, and a manganese source in an ethanol solution and stirring to obtain a mixture A; dissolving a titanium source in an ethanol solution and stirring to obtain a mixture B; dissolving a phosphorus source and a boron source in a deionized aqueous solution and stirring to obtain a mixture C; slowly adding mixtures B and C sequentially to mixture A and stirring to obtain a mixture D; subjecting mixture D to oil bath heating, drying, and calcination treatment sequentially to obtain boron ion-doped modified titanium manganese phosphate. This invention prepares a boron ion-doped modified titanium manganese phosphate and applies it to sodium-ion battery cathode materials. By doping boron ions into titanium manganese phosphate, a boron ion-doped modified titanium manganese phosphate cathode material with excellent electrochemical performance is prepared.

The application provides a positive electrode material, a preparation method thereof, a positive electrode sheet and a battery. The positive electrode material comprises a lithium iron manganese phosphate core, a first coating layer and a second coating layer. The first coating layer is coated on at least part of the surface of the lithium iron manganese phosphate core, and the second coating layer is coated on at least part of the surface of the first coating layer. The first coating layer comprises a metal oxide material, and the second coating layer comprises a carbon material. The positive electrode material has high structural stability and can improve the cycle performance of the battery.

This invention belongs to the field of lithium-ion battery cathode material preparation, specifically a method for directly preparing lithium iron phosphate (LFP) / lithium manganese iron phosphate (MFP) from conventional aqueous solutions, and the subsequent preparation of LFP / MFP cathode materials. In a conventional (non-high temperature and high pressure) lithium-containing glycine aqueous solution system, this invention utilizes the coordination ability of glycine ligands for metal ions to control the coordination state of the metal ions, allowing direct preparation of LFP or MFP during phosphate precipitation. Carbon-coated sintering of LFP or MFP yields LFP or MFP cathode materials with excellent electrochemical performance. This method avoids the high temperature and high pressure conditions of hydrothermal methods, directly preparing the material from conventional aqueous solutions, significantly reducing the phase inversion reaction time, improving production efficiency, and lowering energy consumption.

The application discloses carbon-coated doped manganese iron pyrophosphate, a preparation method and application thereof. The application controls the ratio of manganese source, iron source and phosphorus source and reaction conditions in the preparation process, so that divalent manganese and divalent iron are precipitated to form manganese iron ammonium phosphate, impurities are removed and crystallization is carried out, and finally, manganese iron pyrophosphate is obtained by calcination. The whole precipitation process does not need inert gas protection, effectively reducing the production cost; the removal of impurities and crystallization can improve the uniformity of the finished product and effectively avoid the existence of non-divalent manganese and divalent iron impurities in the finished product, improving the purity. Meanwhile, the carbon source and dopant are used for coating and doping manganese iron pyrophosphate, so that the carbon-coated doped manganese iron pyrophosphate can inhibit the elution of manganese ions when applied in lithium manganese iron phosphate, the secondary carbon coating makes the carbon layer more uniform and dense, and the performance of lithium manganese iron phosphate is significantly improved. In addition, the synthesis period of the application is short, the cost is low, and the application is suitable for large-scale popularization and application.

This invention provides a graphene-coated lithium manganese iron phosphate, its preparation method, and its application. The preparation method includes the following steps: mixing a precursor, a lithium source, and a phosphorus source to obtain a mixture; the precursor is a co-precipitation product of iron and manganese, and includes doped metal ions; calcining the mixture, and after the heat preservation stage during calcination, introducing carbon source gas to continue heat preservation, thereby obtaining the graphene-coated lithium manganese iron phosphate. The preparation method utilizes metal active sites combined with chemical vapor deposition to obtain uniformly graphene-coated lithium manganese iron phosphate, significantly improving the material's conductivity, cycle performance, and rate performance, reducing battery internal resistance and charge / discharge polarization, and the overall process is simple, easy to operate, and can effectively reduce reaction temperature and cost.

This invention relates to the field of lithium-ion battery materials technology, and in particular to a method for multi-level doping of a manganese iron phosphate precursor, comprising the following steps: S1, preparing a ferrous salt solution, a manganese salt solution, and a copper salt solution; S2, adding the ferrous salt solution and the manganese salt solution to a first reaction vessel, adding a precipitant and a buffer, mixing and reacting, and introducing gas 1 to obtain an MFC precursor; S3, overflowing the MFC precursor from the first reaction vessel to a second reaction vessel, adding the ferrous salt solution, manganese salt solution, buffer, precipitant, and copper salt solution to the second reaction vessel, and introducing gas 1 to obtain an MFCC slurry; S4, purging the slurry washing vessel, introducing gas 2, adding a phosphoric acid solution to obtain an MFCP slurry; S5, after aging, washing, drying, and packaging, obtaining the finished MFCP precursor. This invention allows for multi-level doping and coating to improve the cycle stability and battery capacity of the material, and this process offers high production line flexibility and low cost.

The application provides a lithium manganese iron phosphate material, a preparation method thereof, a pole piece and a battery. The preparation method comprises the following steps: performing first sintering treatment on a lithium manganese iron phosphate precursor at a first temperature, and then performing second sintering treatment on the lithium manganese iron phosphate precursor at a second temperature to obtain the lithium manganese iron phosphate material; wherein the first temperature is lower than the second temperature; the lithium manganese iron phosphate precursor comprises a phosphorus source, a manganese source, an iron source, a lithium source, a carbon source and a complexing agent, the complexing agent comprises a first complexing agent and a second complexing agent; the thermal decomposition temperature of the first complexing agent is not higher than the first temperature, and the thermal decomposition temperature of the second complexing agent is higher than the first temperature and not higher than the second temperature. The method can prepare a lithium manganese iron phosphate positive electrode material which has a high compaction density and a good cycle performance.

This invention belongs to the field of sodium-ion battery technology and discloses a method for preparing and applying a fluorine-substituted sodium titanium manganese phosphate cathode material. The method includes the following steps: (1) obtaining a mixed solution comprising a sodium source, a manganese source, a titanium source, a phosphate source, and a chelating agent; (2) performing a first concentration on the mixed solution to obtain a concentrated solution; (3) adding a fluorine source to the concentrated solution, mixing, and then performing a second concentration to obtain a gel; (4) drying and grinding the gel, and then calcining it under an inert atmosphere to obtain the cathode material. This invention achieves this by controlling the order of fluorine source addition and precisely controlling the Mn / Ti molar ratio and F... ‑ The amount of sodium-ion batteries replaced can be used to achieve a synergistic improvement in capacity, rate performance, and cycle stability.