369results about "Manganates/permanganates" patented technology

The invention discloses a preparation method and application of a zinc-manganese bimetal organic framework derived composite nano-enzyme, and belongs to the technical field of nano-materials. Zinc-manganese bimetal organic framework nanoparticles prepared by reacting ZIF-8 with manganese (III) acetylacetonate are used as a template, and are calcined at different temperatures in a tubular furnace to obtain zinc-manganese bimetal organic framework derivative composite nano-enzymes with different morphologies. The nano enzyme has peroxidase-like activity, glutathione peroxidase-like activity and catalase-like activity, and has a wide application prospect in anti-tumor treatment.

The invention discloses a preparation method of a cerium-copper co-doped delta-MnO2 microsphere aqueous zinc ion battery positive electrode material, and belongs to the technical field of aqueous zinc ion batteries. The method comprises the following specific steps: dissolving a manganese source in a mixed alcohol solution to obtain a solution A; doping a copper source and a cerium source into the solution A in proportion, and dissolving after ultrasonic stirring to obtain a solution B; adding acid into the solution B, and ultrasonically stirring to obtain a solution C; and carrying out microwave hydrothermal treatment on the solution C to obtain a mixture. And cooling the mixture to room temperature, repeatedly centrifugally washing with deionized water and ethanol, drying to obtain a material A, heating and calcining the material A in a muffle furnace, and carrying out heat preservation to obtain the cerium-copper co-doped delta-MnO2 positive electrode material which is recorded as CexCuyK0. 19Mn0. 935O2. The invention also discloses a preparation method of the cerium-copper co-doped delta-MnO2 positive electrode material. The electrode material is uniform in particle size, high in crystallinity, high in reversible capacity and excellent in cycling stability, the preparation process is simple and relatively mature, and certain industrial feasibility is achieved.

The present invention relates to: a positive electrode active material capable of improving the performance of a lithium secondary battery, the positive electrode active material comprising a lithium-rich manganese-based oxide including both an Li2MnO3 phase and a LiMO2 (where, M is an element including Ni, Mn, or a combination thereof) phase, wherein the lithium-rich manganese-based oxide has a composition represented by chemical formula 1 disclosed in the present specification; a method for producing same; and a positive electrode and a lithium secondary battery comprising same.

The invention belongs to the field of lithium ion battery materials, and discloses a precursor of a lithium-rich manganese-based positive electrode material and a preparation method and application thereof.The precursor comprises a core and a coating layer coating at least part of the surface of the core, the core is Mn2Oy, and y is larger than or equal to 2 and smaller than or equal to 3; the coating layer is MnX2O4, and X is any one or more than two of Fe, Co and Zn. The Li2XMn3O8 coated lithium-rich manganese-based positive electrode material is generated by lithiating and sintering the precursor, and the Li2XMn3O8 has a spinel structure and is perfectly connected with a layered structure of the lithium-rich manganese-based positive electrode material, so that the positive electrode material has good structural stability and high voltage resistance, and the electrochemical stability of the lithium-rich positive electrode material can be effectively improved.

The invention discloses a doped lithium-rich manganese oxide positive electrode material and a preparation method and application thereof, the chemical general formula of the doped lithium-rich manganese oxide positive electrode material is LiaMnbM (1-b) RExO2 + b, a is more than or equal to 1.0 and less than or equal to 2.5, 0.2 lt; b is less than or equal to 1, 0.0001 lt; xlt; m is one or more of Ni, Co, Mn, Ti, Cr, Fe, Al, Nb and Ru, and RE is at least one of Nd, Sm, Gd, Dy, Ho, Er, Tm and Lu. According to the positive electrode material, lattice oxygen in a lithium-rich manganese material is stabilized by introducing rare earth cations, so that the crystal structure stability of the material is improved, and the compatibility of high energy density and long cycle life of the lithium-rich manganese oxide positive electrode material is realized.

The invention discloses a sodium ion battery layered oxide positive electrode material based on surface reconstruction and a preparation method thereof, and belongs to the field of sodium ion batteries. The positive electrode material comprises a positive electrode material body with a layered structure and a reconstruction layer with a disordered rock salt structure on the surface of the body, and the whole positive electrode material is of a disordered rock salt / layered heterostructure; the positive electrode material body is Na < 0.71 > Li < 0.2 > M < x > Mn < 0.8-x > O < 2 >, x is more than or equal to 0.05 and less than or equal to 0.25, and M is any one element of Al, Fe and Ni; the reconstructed layer of the disordered rock salt structure is obtained by quenching the positive electrode material body in a molybdate aqueous solution, and the thickness of the reconstructed layer of the disordered rock salt structure is 2-5nm. The sodium ion battery layered positive electrode material provided by the invention has the characteristics of high specific capacity and high cycle stability.

The embodiment of the invention relates to a positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: putting a first lithium salt and a transition metal oxide into a zirconium oxide ball milling tank for wet milling to obtain a metal salt precursor; and performing heat treatment on the metal salt precursor in an inert atmosphere to obtain the lithium-rich cation disordered rock salt, placing the lithium-cation-rich disordered rock salt and a second lithium salt in a zirconium oxide ball milling tank for ball milling, so that a non-metallic element in the second lithium salt is inserted into a transition metal gap of the lithium-cation-rich disordered rock salt, thereby forming anions between an oxygen element and the non-metallic element of the lithium-cation-rich disordered rock salt, and obtaining a positive electrode material; wherein non-metallic elements in the second lithium salt are in a cation valence state, and the ion radius is smaller than the lithium ion radius in the first lithium salt and the transition metal ion radius in the transition metal oxide.

The invention discloses a solid oxide electrolytic tank for high-temperature electrolysis of carbon dioxide and a preparation method. The electrolytic tank comprises a solid electrolyte substrate, an isolation layer located on one side of the solid electrolyte substrate, a cathode located on the isolation layer and an anode located on the other side of the solid electrolyte substrate. And the material of the solid electrolyte substrate is La < 0.9 > Sr < 0.1 > Ga < 0.8 > Mg < 0.2 > O < 3 > (LSGM). And the material of the isolating layer is Ce < 0.8 > Sm < 0.2 > O < 1.9 > (SDC). The cathode material is a compound composed of Sr2Fe1. 5Mo0. 5O6 (SFM) and Ce0. 8Sm0. 2O1. 9 (SDC), and La0. 8Sr0. 2Cr0. 5Mn0. 5O3 (LSCM) nano particles or CuO nano particles are attached to the cathode material. The anode material is a compound composed of La < 0.7 > Sr < 0.3 > Co < 0.2 > Fe < 0.8 > O < 3 > (LSCF) and Ce < 0.8 > Sm < 0.2 > O < 1.9 > (SDC). The nanoparticles can effectively increase the specific surface area of an electrode, generate additional active sites, provide enough reaction interfaces and gas diffusion channels, effectively promote the reduction reaction of CO2, and contribute to reducing the local carbon concentration and reducing the occurrence rate of carbon deposition.

The invention relates to a manganese zinc ferrite / graphene composite aerogel material and a preparation method thereof. The manganese zinc ferrite / graphene composite aerogel material is prepared from the following raw materials: manganese zinc ferrite and graphene oxide, wherein the mass ratio of the manganese zinc ferrite to the graphene oxide is (0.06-0.18): 1, and the manganese zinc ferrite and the graphene oxide are subjected to hydrothermal reaction and freeze drying to obtain the composite aerogel material. According to the technical scheme, the method has the advantages that the impedance matching degree of the graphene aerogel is improved, the effective absorption bandwidth is widened, and the graphene aerogel is light and efficient.

The invention discloses a method for in-situ lossless repair of an attenuated lithium manganate positive electrode material, which specifically comprises the following steps: adding the attenuated lithium manganate material into a lithium hydroxide solution, supplementing lithium to an original value by a hydrothermal method, repairing the component and structure defects of attenuated LiMn2O4 by combining high-temperature roasting, and recycling and regenerating lithium manganate particles with severely attenuated capacity. The lithium manganate positive electrode material is directly recovered by the lossless method, and the chemical components and crystallinity of the invalid positive electrode material in various health states are reconstructed, so that the invalid positive electrode material can be repeatedly used in the lithium ion battery. Finally, the treated recycled powder material is coated by a metal organic framework (MOFs) self-assembly method, so that the electrochemical performance of the treated powder material is further improved. The method is simple, environmentally friendly and low in energy consumption, has obvious advantages compared with a traditional hydrometallurgy battery recovery method, and lays an important foundation for sustainable manufacturing of energy materials.

The present invention relates to a method for regenerating a positive electrode active material and a regenerated positive electrode active material manufactured thereby and, more specifically, to a method for regenerating a positive electrode active material and a regenerated positive electrode active material manufactured thereby, the method comprising: (a) a step for recovering a positive electrode material by heat-treating, in air or oxygen, a waste positive electrode including a current collector and a positive electrode active material layer coated thereon; (b) a step for adding a lithium precursor to the recovered positive electrode active material and heat-treating in air to restore the crystal structure of the positive electrode active material; (c) a step for adding a dopant precursor to the positive electrode active material with the restored crystal structure and heat-treating same to dope the positive electrode active material; and (d) a step for washing the doped positive electrode active material with a washing solution.　According to the present invention, the regenerated positive electrode active material is doped with a predetermined dopant using a predetermined method, thereby improving capacity characteristics and lifespan characteristics. Thus, the present invention has the effect of providing a method for regenerating a positive electrode active material having excellent crack resistance and a regenerated positive electrode active material manufactured thereby.

The invention provides a lithium manganate composite material and a preparation method thereof, a positive plate, a battery and power-related equipment, and relates to the technical field of lithium batteries. A metal organic framework coating layer is formed on the surface of a lithium manganate particle through metal reaction of an organic ligand and a metal salt, and the metal organic framework coating layer is converted into the lithium manganate composite material formed by coating the lithium manganate particle with a composite material of a metal oxide and carbon through a pyrolysis process. The lithium manganate composite material provided by the invention is simple in preparation method and low in cost, and has a wide industrial application prospect.

The invention belongs to the field of lithium batteries, and particularly relates to a preparation method of a modified lithium manganate positive electrode material, the modified lithium manganate positive electrode material is prepared by using one-time pre-sintering and two-time sintering, and the preparation method comprises the following steps: firstly, mixing lithium / manganese / N compounds, and carrying out one-time low-temperature calcination at 500-700 DEG C to prepare a precursor; the preparation method comprises the following steps: preparing a precursor, doping a T compound into the precursor, sintering for the first time, annealing at 600-750 DEG C to obtain a modified lithium manganate material, and finally sintering and coating an F compound for the second time to obtain a coated lithium manganate material finished product. According to the preparation method disclosed by the invention, the problem of Mn (III) dissolution of an octahedral spinel morphology material is solved, and the probability that the crystal face activity of a truncated spinel morphology material is too large, so that the truncated spinel morphology material is easily subjected to side reaction with an electrolyte to cause excessive gas production can be reduced; the preparation method disclosed by the invention is simple and is carried out in an air atmosphere, only a muffle furnace is used as heating equipment, the cost is low, the flow time is short, and industrial production is easy.

The invention discloses a positive electrode material and a preparation method thereof, a positive electrode plate, a secondary battery and an electronic device. The positive electrode material comprises an element M1, an element M2 and an element X; the M1 element comprises one or more of a vanadium element, a niobium element or a tantalum element; m2 element comprises one or more of lanthanum element, cerium element, praseodymium element, samarium element, dysprosium element, ytterbium element, yttrium element or lutetium element; the X element comprises one or more of fluorine element, chlorine element, sulfur element, nitrogen element or boron element. The high-temperature cycle performance can be improved, and the cycle life can be prolonged.

The invention provides a phase-doped lithium cobalt oxide positive electrode material, a preparation method thereof and a lithium ion battery, the lithium cobalt oxide positive electrode material comprises lithium cobalt oxide and a doping phase in a crystal structure of the lithium cobalt oxide, and the doping phase comprises any one or a combination of at least two of Li2Co [M2] 3O8, Li4 [M2] 5O12 or [M1] 4 [Li [M2]] O8. The lithium cobalt oxide positive electrode material provided by the invention has a doping phase, and the lithium cobalt oxide positive electrode material is strengthened by adopting a phase strengthening method, so that the conductivity of the lithium cobalt oxide positive electrode material under high voltage (gt; 4.55 V), and the charge-discharge cycle stability is improved; the doping phase is uniformly distributed in the crystal structure of the lithium cobalt oxide, and the size of the doping phase belongs to nanoscale, so that the stress concentration in the charge-discharge cycle process caused by the size effect is avoided.

The present application relates to a lithium ion battery positive electrode material, and a preparation method therefor and the use thereof. The preparation method comprises the following steps: (1) preparing a mixed solution from a raw material containing metal ions, a polymer and a solvent, independently leaving same and an ammonium source to stand in the same space, and subjecting same to solid-liquid separation to obtain a precursor, and (2) mixing and calcining the precursor in step (1) and a lithium source to obtain a lithium ion battery positive electrode material.

The invention relates to a method for producing a precursor compound (34) for a manganese-based lithium sorbent (12), wherein a starting fluid (14) comprising a lithium salt and a manganese salt is provided, wherein the starting fluid is spray-dried, and wherein a drying material (28) obtained thereby is calcined to obtain a precursor compound comprising lithium manganese oxide particles (36). The invention also relates to a method for producing a manganese-based lithium sorbent, a precursor compound for a manganese-based lithium sorbent, and a manganese-based lithium sorbent.

To provide a cathode active material for a lithium-ion secondary battery, enabling the effective improvement of the cycle characteristics of the lithium-ion secondary battery.SOLUTION: The cathode active material for a lithium-ion secondary battery is formed by covering the surfaces of particles A with particles B. Each of the particles A is represented by the following formula (a) LiM1aMnbO4 ... (a), and each of the particles B is represented by the following formula (b) LifMngFehM2xPO4 ... (b) and has an average particle diameter of 50 nm to 200 nm, wherein the mass ratio (B:A) of the particles B to the particles A is 10:90 to 45:55.SELECTED DRAWING: None

According to an embodiment of the present disclosure, there is provided a positive electrode active material for lithium secondary battery comprising: a lithium compound represented by the following Chemical Formula 1, and a coating layer formed on the surface of particles of the lithium compound. wherein the coating layer includes a carbon and a surface modifier, and wherein the positive electrode active material has a D / G band ratio value of 0.7 to 0.89 when its surface is measured by Raman spectroscopy.         [Chemical Formula 1]     Li1+aTibMncO2-dXd in Chemical Formula 1, 0.1≤a≤0.5, 0.2≤b≤0.6, 0.2≤c≤0.6, 1.1≤(1+a) / (b+c)≤1.5, 0≤d≤0.2, and X is a halogen element, a method for preparing the same, a positive electrode and a lithium secondary battery including the same.

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

Provided is a manganese oxide represented by A-Mn-O as constituent elements, in which the constituent element A is one or more elements selected from H, an alkali metal, an alkaline-earth metal, a rare earth element, Be, Mg, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Re, Fe, Ru, Co, Os, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, B, Al, Ga, In, Tl, Si, Ge, Sn, Pb, P, Sb, Bi, S, Se, Te, F, Cl, Br, and I.

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.

The application discloses a kind of composite coated lithium transition metal oxide materials and preparation method and application thereof, belong to battery material technical field.The composite coated lithium transition metal oxide material includes lithium transition metal oxide material and the composite of coating on the surface of lithium transition metal oxide material;The chemical formula of lithium transition metal oxide material is Li a M 1‑b M′ b O2, the chemical formula of composite is ABC3;When B and M have same element, the chemical state of same element in composite is different from the chemical state in lithium transition metal oxide material.The composite coated lithium transition metal oxide material has lower impedance, better ion conduction, lower gas production, better cycle performance and safety performance at high voltage, which is beneficial to improve the electrochemical performance of lithium ion battery.

The invention provides a positive active material and a preparation method thereof, a positive pole piece, a battery and electric equipment, the positive active material comprises a bulk phase and a coating phase located on at least part of the surface of the bulk phase, the bulk phase comprises Nax1Mny1XzO2 + delta1, the Nax1Mny1XzO2 + delta1 comprises an O '3 phase, 0.8 < = x1 < = 1, 0.8 < = y1 < = 1, 0 < = z < = 0.2,-0.1 < = delta1 < = 1, and X comprises one or more of Ti, Zr, Ge and Sn; the coating phase comprises Nax2Mny2XzO2 + delta2, the Nax2Mny2XzO2 + delta2 comprises a P2 phase, 0.4 < = x2 < = 0.7, 0.85 < = y2 < = 1, and-0.1 < = delta2 < = 1. Therefore, the air stability of the positive electrode active material is improved, and the cycle stability of the battery is improved.

The present invention discloses a lithium ion battery ternary positive electrode material, wherein the material is a LiNi x Co y Mn 1‑x‑y A new phase is introduced into the O2 ternary positive electrode material, wherein 0<x<1, 0<y<1; the new phase is a metal oxide, and the new phase is x Co y Mn 1‑x‑y The coherent growth of the lamellar phase in the O2 ternary cathode material. The coherent growth of the two phases in the present invention is achieved by regulating the ternary cathode material components and process parameters during the material synthesis process, thereby inducing a new phase that coexists with the lamellar phase within the bulk phase of the ternary cathode material particles. The coherent growth of the lamellar phase and the new phase within the bulk phase of the ternary cathode particles acts as a "pinning" force within the crystal, preventing crystal structure collapse caused by anisotropic volume changes during charge and discharge, thereby alleviating mechanical failure of the ternary cathode material during cycling.

To obtain dissimilar metal-doped cerium oxide catalyst at a high recovery rate with respect to a loading amount of dry powder in firing by causing a loading thickness of the dry powder in the firing to fall within a certain range in a firing step in production of the dissimilar metal-doped cerium oxide catalyst so as to improve the productivity.SOLUTION: A production method of dissimilar metal-doped cerium oxide includes (A) a step of blending raw materials to prepare an aqueous solution, (B) a step of spray-drying the aqueous solution, and (C) a firing step. In (C) the firing step, a loading thickness of dry powder is 8 mm or more and 50 mm or less.SELECTED DRAWING: None

There is provided a method of manufacturing a disordered rocksalt-cathode active material of Formula 1:Li0.4+xM1yM2zO2−kFk  (1)Wherein, 0<x≤1.6, 0≤z≤1, 0≤k≤0.660<y≤1 and (x+y+z)≤1.6, and wherein M1 is a redox center selected from Mn, Ni, V, Co, Fe, Ir, Cr, Ru, Mo, and combinations thereof, and M2 is a d0 transitional metal selected from Ti, Zr, V, Nb, Sn, Mo and combinations thereof. The value of y is determined for a species of M1 based on a selection of the other parameters in order to maximize the electrical conductivity. Mathematical simulations that leverage the polaron energy barrier are used to determine the percolation probability and the accessibility of M1 in the percolation network. This allows to select for values of y to obtain a proportion of accessible M1 of at least 90% to improve electrical conductivity and manufacture the active material accordingly.

This invention relates to the field of cathode material technology for lithium-ion batteries, specifically a method for in-situ construction of ultrathin amorphous nano-coating materials. The method involves the in-situ construction of ultrathin amorphous nano-coating layers using sol-gel, co-precipitation, and electrodeposition combined with hydrothermal methods. 2 MnO 3 The cathode material is coated to encapsulate Li. x MnO y The amorphous nanostructure is uniform and completely coated on Li. 2 MnO 3 The surface of the positive electrode material (Li x MnO y @Li 2 MnO 3 ), where Li x MnO y It is an amorphous coating layer with a thickness of 0.1-10 nm; this invention utilizes Li 2 MnO 3 The cathode material is coated with an ultrathin amorphous Li. x MnO y While ensuring the high discharge specific capacity of the material, it also significantly suppresses Li 2 MnO 3 The voltage decay was observed, and after assembling it into a coin cell and testing its performance, the coated Li was found to have... 2 MnO 3 The material exhibits zero voltage decay after 50 charge-discharge cycles.

The application discloses a cerium-regulated potassium-manganese composite metal oxide catalyst with a hollow nanotube structure, which is a cerium-regulated potassium-manganese composite metal oxide catalyst with a hollow nanotube structure and is composed of a composite metal potassium-manganese, potassium-manganese-cerium and oxygen. The application applies a centrifugal spinning method to the preparation of a morphology of a hollow nanotube metal oxide catalyst and catalytic combustion of carbon smoke. In the preparation method, low-cost metal nitrate and metal acetate are selected as metal precursors, polyvinylpyrrolidone is used as a template agent, and a cerium-regulated potassium-manganese composite metal oxide catalyst with a hollow nanotube structure is obtained through dissolution-centrifugal spinning-drying-calcination. The preparation method can be applied to the preparation of various composite metal oxide catalysts and has the advantages of simple preparation process, strong practicability, high efficiency, low cost and easy realization of large-scale production.

A lithium transition metal oxide powder comprised of interspersed orthorhomic and disordered rocksalt phases therein may be made by mixing a lithium precursor and a Mn precursor and a transition metal precursor comprised of another transition metal in a molar ratio of Mn / other transition metal of at least 1.5 to form a mixture, and heating the mixture for a reaction time (e.g., 15 minutes to 24 hours) and reaction temperature (800 °C to 975 °C) to form the lithium transition metal oxide powder. A powder comprised of a mixture of a disordered rocksalt powder and an orthorhombic powder having an average size ratio (disordered rocksalt powder average / orthorhombic powder average) from 0.2 to 5 is made by comminuting a mixture of these powders.