114results about "Iron compounds" patented technology

A carbon-coated cathode material (3) and a preparation method thereof. The carbon-coated cathode material (3) includes a lithium metal phosphate particle (P) and a carbon coating layer (C). The carbon coating layer (C) is coated on the lithium metal phosphate particle (P). The carbon coating layer (C) is formed by a first heat treatment and a second heat treatment. A first carbon source is added in the first heat treatment, and a second carbon source is added in the second heat treatment. The first carbon source has a first weight percentage relative to the lithium metal phosphate particle (P). The second carbon source has a second weight percentage relative to the lithium metal phosphate particle (P). The first weight percentage of the first carbon source is equal to or less than the second weight percentage of the second carbon source.

The application relates to the technical field of sodium ion battery positive electrode materials, in particular to a Na2Fe2(SO4)3@Na3Fe2(SO4)3F@CNT positive electrode material.The Na2Fe2(SO4)3 and Na3Fe2(SO4)3F precursors are mixed and sintered, and are coated by CNT, so that the electrochemical performance of the Na2Fe2(SO4)3 is remarkably improved, the conductivity of the material is improved, the material can be used as a sodium ion battery positive electrode material, has a high discharge specific capacity, and has cycle performance and rate performance.

This invention provides a NiZn-based ferrite that offers excellent productivity and can suppress the increase in the rate of change of complex relative permeability with respect to temperature, as well as a noise filter using the same. [Solution] A NiZn-based ferrite containing Fe in the form of "48.06 mol% or more and 48.43 mol% or less" in Fe2O3 equivalent, Zn in the form of "29.47 mol% or more and 29.96 mol% or less" in ZnO equivalent, Cu in the form of "5.70 mol% or more and 6.30 mol% or less" in CuO equivalent, and Ni in the form of "15.70 mol% or more and 16.34 mol% or less" in NiO equivalent, wherein when the total amount of Fe2O3, ZnO, NiO and CuO is taken as 100 mol%, the total amount of Fe2O3 and ZnO is "77.51 mol% or more and 78.39 mol% or less".

This application provides a lithium-rich lithium iron ferrite (LFO) material, its preparation method, a positive electrode sheet, and a secondary battery, belonging to the field of secondary battery technology. The preparation method includes: mixing a lithium source and an iron source to obtain a mixture; subjecting the mixture to preheating sintering, a first sintering, a first pulverization process, a second sintering, and a second pulverization process sequentially to obtain a sintered material; dispersing a carbon source and a phosphorus source in an organic solvent to obtain a coating solution; dispersing the sintered material in the coating solution and drying to obtain an intermediate product; sintering the intermediate product and pulverizing it to obtain the lithium-rich lithium iron ferrite material; wherein the lithium source is lithium hydroxide or a mixture of lithium hydroxide and lithium oxide; the temperature of the first sintering is controlled within the range of 410~550℃, and the temperature of the second sintering is controlled within the range of 600~780℃. This application aims to solve the technical problem of high production cost in existing LFO synthesis methods.

The application provides a kind of iron ion Fe 3+ Doped spinel structure fluorogallate near-infrared fluorescent powder and its preparation method and medical flaw detection application.The iron ion Fe 3+ Doped spinel structure fluorogallate near-infrared fluorescent powder has the chemical formula MgGa2O4:xFe 3+ , yF ‑ ; wherein, 0.00025≤x≤0.016, 0.05≤y≤1.2. Respectively, the compound containing magnesium ion Mg 2+ , the compound containing gallium ion Ga 3+ , the compound containing fluorine ion F ‑ And the compound containing iron ion Fe 3+ As raw materials, the product is obtained by calcination treatment. The Fe 3+ Doped spinel structure fluorogallate near-infrared fluorescent powder can be applied in biomedical non-destructive flaw detection.

The application discloses a kind of Li + The application discloses a P2-type layered oxide sodium-ion battery positive electrode material and a preparation method thereof, and belongs to the technical field of sodium-ion battery materials. + The stable layered crystal framework is constructed by doping, and the material microstructure is optimized by combining a urea chelation hydrothermal method with a gradient high-temperature solid-phase sintering process. + The P2-O2 irreversible phase transition under high voltage is effectively inhibited by means of the "support effect" of Li The sodium-ion transmission path is shortened, and the electrode / electrolyte interface contact efficiency is improved, so that the cycle stability and interface kinetics performance of the material are simultaneously improved.

This invention discloses a P2-type high-entropy layered oxide, its preparation method, cathode material, and sodium-ion battery, relating to the field of sodium-ion battery material technology. By employing a low-nickel, cobalt-free, or low-nickel, low-cobalt formulation, the material preparation cost is effectively reduced in terms of composition. The rational control of the content of each metal element, combined with an optimized preparation method, effectively avoids the precipitation of the second phase in the P2-type high-entropy layered oxide. This successfully and efficiently prepares a high-entropy layered oxide free of impurities and possessing a single-phase P2-type crystal structure, which is beneficial for improving the preparation efficiency and stability of the P2-type high-entropy layered oxide, achieving a stable improvement in the electrochemical performance of sodium-ion batteries. This strategy can be extended to other high-entropy layered oxide systems.

This invention discloses a composite modified lithium manganese oxide cathode material, its preparation method, and its applications, belonging to the field of cathode material technology. The structural formula of the composite modified lithium manganese oxide cathode material is: LiX a O b @LiYO2 / LiMn2O4, comprising: a core composed of LiYO2 and LiMn2O4, and LiX coating at least a portion of the surface of the core. a O b The coating layer; wherein: LiMn2O4 has a porous structure, and LiYO2 fills the channels of LiMn2O4. The cathode material in this invention uses lithium manganese oxide as a matrix, with LiYO2 filling the channels of the matrix, and LiX coated on the surface of the matrix. a O b Filling the pores with LiYO2 can reduce the Jahn-Teller effect of lithium manganese oxide without affecting the specific capacity of the cathode material. Moreover, LiYO2 can accelerate the lithium-ion diffusion rate, thereby improving the rate performance of the material.

This application provides a lithium-rich lithium ferrite material, a method for producing the same, and a use thereof, and belongs to the field of cathode materials. The lithium-rich lithium ferrite material comprises a core-shell structure particle, the core-shell structure particle comprising a core, a first coating layer covering the outside of the core, and a second coating layer covering the outside of the first coating layer, wherein the core is Li5FeO4, the first coating layer is a carbon layer, and the second coating layer is a mixed layer containing polyoxyethylene and a lithium salt, the mass ratio of the first coating layer to the core is (2:100) to (10:100), and the mass ratio of the second coating layer to the core is (3:100) to (13:100). This application helps to improve the stability of lithium ferrite in air and can also increase the ionic conductivity of the entire electrode.

The present application relates to a kind of A site non-stoichiometric oxygen ion conductor fuel electrode, preparation method and use in solid oxide electrolysis cell.The symmetry balance of double perovskite structure is broken by introducing A site Sr defects, not only effectively induce the in-situ desolution of B site Fe species, also significantly improve the migration rate of lattice oxygen and surface oxygen vacancy concentration.At the same time, with the increase of the reducing property of pre-treatment atmosphere (P O2 reduction), Sr 1.8 Fe 1.5 Mo 0.5 O 6‑δ Fuel electrode has experienced the change process from surface oxygen vacancy to in-situ desolution of metal Fe nanoparticles.After H2-Ar atmosphere treatment, the in-situ precipitated Fe nanoparticles form rich multi-phase interface with matrix perovskite, which not only increases more surface reaction sites, but also significantly accelerates the adsorption and activation of CO2 molecule.In addition, A site defects also enhance the thermochemical stability of the material, and promote the kinetic diffusion of internal components, which shows excellent CO2 reduction reaction performance.

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.

The invention relates to active electrode materials and to methods for the manufacture of active electrode materials. Such materials are of interest as active electrode materials in lithium-ion or sodium-ion batteries. The invention provides an active electrode material expressed by the general formula [M][Nb]y[O]z; wherein the active electrode material is oxygen deficient; wherein M consists of one of Mg, Cr, W, Mo, Cu, Ga, Ge, Ca, K, Ni, Co, Al, Sn, Mn, Ce, Sb, Y, La, Hf, Ta, Zn, In, or Cd; y satisfies 0.5≤y≤49; and z satisfies 4≤z≤124.

The invention relates to active electrode materials and to methods for the manufacture of active electrode materials. Such materials are of interest as active electrode materials in lithium-ion or sodium-ion batteries. The invention provides an active electrode material expressed by the general formula M1aM21-aM3bNb49-bO124-c-dQd.

The application belongs to the technical field of solid oxide fuel cell anode catalyst, and particularly relates to a preparation of a multi-doped layered perovskite anode and application thereof in ammonia solid oxide fuel cells. x Ba 1–x Mn 1–y TM y O 3–δ (0.4<=x<=0.6, 0<=y<=0.3, TM=Co, Fe, Cu), the precursor is phase changed under a reducing atmosphere to form a PrBaMn2O 5+δ layered perovskite with rich oxygen vacancies, and the doped transition metal is precipitated in the form of an alloy and anchored on the surface of the layered perovskite. The anode catalyst has a simple synthesis method, low cost, rich and flexible adjustable element composition. The obtained anode catalyst is made into a slurry and then assembled into a solid oxide fuel cell single cell sheet. The solid oxide fuel cell prepared by the application has good power output, electrical conductivity and stability at medium and high temperatures.

The application relates to the technical field of battery materials, and discloses a lithium secondary battery positive electrode coating material as well as a preparation method and application thereof. 3+z Nb 1‑ x M x O 4‑y R y wherein M is selected from one of Fe, Ti, Mn, Mo, W, V, Ta and Cr; R is selected from one of F, Cl, Br and I; 0<=x<1, 0<=y<=4, and the values of x, y and z satisfy the charge balance of the positive electrode coating material. The application integrates the triple functions of thermodynamic interface protection, fast ion conduction and charge compensation in a single material through cation, anion or anion-cation co-doping design based on Li3NbO4 as a matrix; the positive electrode coating material can significantly reduce the solid-solid interface impedance in a full solid-state battery, improve the first circle coulomb efficiency, and greatly improve the long cycle stability of an electrode; meanwhile, the positive electrode coating material can effectively inhibit the decomposition of high-voltage electrolyte in a traditional liquid battery, and improve the cycle life of a positive electrode material.

This invention discloses a lithium replenishing agent coated with a metal-organic framework (MOF), its preparation method, and its application, belonging to the field of lithium-ion batteries. The lithium replenishing agent comprises a matrix and a coating layer. The matrix is ​​lithium ferrite, and the coating layer is a MOF with a thickness of 0.5-10 nm. The MOF is prepared using fluorine-containing and carboxyl-containing compounds as ligands and zirconium tetrachloride as the metal source via a solvothermal method. The preparation method includes the following steps: preparing and activating a lithium ferrite intermediate; adding the activated lithium ferrite intermediate to a buffer solution containing dissolved dopamine hydrochloride to prepare lithium ferrite intermediate @PDA; performing in-situ growth of the MOF to construct a hydrophobic MOF-coated precursor; adding a lithium source to the precursor and performing programmed sintering to obtain the lithium replenishing agent. The lithium replenishing agent provided by this invention achieves excellent air stability, low gas production, and excellent conductivity.

The present invention relates to a cathode active material for a lithium secondary battery, the cathode active material comprising a lithium metal oxide of a lithium-excess composition containing iron (Fe) and manganese (Mn), wherein the lithium metal oxide has a molar ratio (Fe / Me) of iron to all metals excluding lithium of 0.15 to 0.49, the lithium metal oxide has a molar ratio (Mn / Me) of manganese to all metals excluding lithium of 0.51 to 0.85, and the lithium metal oxide has a molar ratio of lithium thereto of 1.05 to 1.4.

The present application provides a kind of nitrogen-doped catalyst and catalytic wet oxidation method, catalyst is carried out by the coprecipitation reaction of soluble salt of iron, lanthanum and copper, and in rotary evaporator device, aging, dry and then mixed with nitrogen-containing precursor grinding, calcination is obtained under inert atmosphere.The specific surface area of catalyst of the present application is 60-120cm 2 ·g ‑1 , the doping amount of nitrogen is 0.5-2.0wt%.For catalytic wet oxidation, due to the doping of copper in B site, it is anchored in the lanthanum ferrite framework, reducing the loss of metal copper, making the catalyst more stable, and improving the catalytic performance of lanthanum ferrite catalyst.

The application discloses a sulfate-based sodium battery positive electrode material, a preparation method and a sodium ion battery. The sulfate-based sodium battery positive electrode material has a composite sandwich structure and has the following general formula: Na2Fe 1+x (SO4) 2+x ·(MPO4) y C z ; wherein x is a sulfate excess coefficient, the value range of x is 0<=x<=1; y is a phosphate metering coefficient, 0.01<=y<=0.3; z is the mass fraction of carbon material, 1<=z<=5; M is selected from one or more of Mg, Ca, Al, Mn, Fe, Co, Ni, Cu, Zn, Ti or Zr; [MPO4] forms the core of the composite sandwich structure, [Na2Fe 1+x (SO4) 2+x ] forms the filling layer of the composite sandwich structure, and [C z ] is distributed at least in the interior of the composite sandwich structure to form the inner layer conductive framework of the composite sandwich structure. The application can fundamentally inhibit the iron ion disproportionation side reaction and the generation of impurities, and guarantee the high purity of the sodium ferric sulfate main crystal phase at the source of the synthesis reaction.

The present disclosure provides an air stable alkali metal iron (II)-hexacyanoferrate (II) of Formula AxMy[Fe(CN)6].zH2O, wherein A is an alkali metal or combinations thereof, M is Fe, x is 1.0 to 2.0, y is 0.7 to 1.0 and z is less than 5.0, wherein the alkali metal iron (II)- hexacyanoferrate (II) is treated with an electrochemically active material such that at least part of surface of particles of alkali metal iron (II)-hexacyanoferrate (II) is covered with said electrochemically active material. Aspects of the present disclosure also provides a method of preparation, an electrode, and a cell comprising the air stable alkali metal iron (II)- hexacyanoferrate (II).

The application discloses a lithium-rich lithium iron phosphate lithium supplement, a preparation method thereof, a positive pole piece and a secondary battery, and relates to the technical field of secondary batteries. The lithium-rich lithium iron phosphate lithium supplement comprises a core and a carbon coating layer located on at least part of the surface of the core. The core comprises aluminum-doped lithium-rich lithium iron phosphate, the mass fraction of aluminum in the lithium-rich lithium iron phosphate lithium supplement is 1.57% to 5.5%, and the mass fraction of elemental iron in the lithium-rich lithium iron phosphate lithium supplement is less than or equal to 950 ppm. The lithium-rich lithium iron phosphate lithium supplement has good specific capacity and cycle stability.

The application discloses a single-atom catalytic conductive carbon network reinforced sodium ferric sulfate positive electrode material and a preparation method thereof. The material is composed of sodium ferric sulfate active material particles and single-atom catalyst doped conductive carbon network embedded therein. The conductive carbon network is a carbon nanotube co-doped with non-metallic elements. The non-metallic elements are at least two of nitrogen, sulfur and phosphorus. The single-atom catalyst is one or more metal atoms selected from iron, copper, nickel, cobalt and manganese. The metal atoms are coordinated with the non-metallic elements and anchored on the doped carbon nanotube in the form of single atoms. The multi-element doping significantly improves the electronic conductivity of the carbon nanotube, the single-atom catalytic site accelerates the ion migration rate, and the interface impedance is significantly reduced. The composite positive electrode material prepared by the application has high reversible capacity, super-long cycle life (0.5C, capacity retention rate > 88% after 500 cycles), and significantly improved electrochemical performance, and has a high commercial application prospect.

This invention relates to SmFeN spherical powder, its preparation method, and its applications. The preparation method of the SmFeN spherical powder of this invention creatively employs the linkage between plasma spheroidization and nitriding, and utilizes a three-stage nitriding process to obtain SmFeN spherical powder with high flowability and high orientation. The nitrogen content fluctuation in the SmFeN spherical powder of this invention is controlled within ±0.2wt%, far superior to traditional processes; the coercivity of the SmFeN spherical powder is ≥20kOe, Hall flow rate ≤30s / 50g, sphericity ≥0.8, and orientation ≥85%; nitrogen is uniformly distributed within the SmFeN spherical powder particles, exhibiting both excellent magnetic properties and molding and processing performance, fully meeting the performance requirements of high-end applications such as 3D printing and injection molding of bonded magnets.

This invention relates to a rare earth metal-doped sodium iron sulfate cathode material, its preparation method, and a battery thereof. The cathode material is expressed as Na. 2‑2x Fe 2‑2x R 2x (SO4)3, where 0.02 ≤ x ≤ 0.1, and R is selected from rare earth metal elements. The preparation uses iron, rare earth metal, and sodium sources as raw materials, and ascorbic acid as a reducing agent. The product is obtained through dissolution and drying. This invention utilizes rare earth ions to substitute Fe. 2+ The invention establishes a stable crystal structure, significantly suppresses Fe ion dissolution at high temperatures, and mitigates structural distortion during charge and discharge. The resulting material exhibits significantly improved capacity retention after 300 cycles at 45°C and 1C rate, demonstrating excellent high-temperature cycling stability. This invention utilizes a mild process, readily available raw materials, and high reproducibility, solving the problems of poor high-temperature cycling and rapid capacity decay in traditional sodium iron sulfate cathodes. It is suitable for high-performance sodium-ion batteries and possesses promising industrialization prospects.

This invention provides a multifunctional halide material, its preparation method, and its application; the multifunctional halide material includes at least one of the following: (I) Li 2‑x M 1‑x A x Cl4;(II) Li 2‑x M' 1‑ x A x Cl4;(II)Li 2‑x M'' 1‑x A x Cl 4‑3x E 3x The multifunctional halide material of this invention possesses both high ionic conductivity and partially reversible delithiation capability, providing additional lithium ions to achieve a lithium replenishment effect.

This invention provides a method for preparing phosphorus-doped lithium ferrite using waste lithium iron phosphate (LFP) electrode sheets and the resulting product, belonging to the field of materials synthesis technology. This method creatively recycles waste LFP electrode sheets in the form of phosphorus-doped lithium ferrite, greatly improving their utilization value. The method for synthesizing phosphorus-doped lithium ferrite using waste LFP electrode sheets has the following advantages: 1) This method requires no additional oxidant, is environmentally friendly, and solves the problem of difficult treatment of phosphorus-containing waste from the process; 2) Using waste LFP electrode sheets as raw materials not only reduces costs and yields high-value-added products, but also has high atom utilization, introduces no other impurities, and is pollution-free; 3) Phosphorus doping can improve the conductivity of lithium ferrite, reduce polarization, and improve structural and air stability.