236results about "Manganates/permanganates" patented technology

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 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 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 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 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

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

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.

The present application belongs to the technical field of inorganic chemical industry, and particularly relates to a method for preparing manganese vanadate from vanadium pentoxide. The method for preparing manganese vanadate from vanadium pentoxide is original, and the method for preparing manganese vanadate by roasting vanadium pentoxide in an inert gas atmosphere is used. Vanadium pentoxide powder is mixed with manganese carbonate (or manganese oxide) reagent to obtain manganese vanadate. As one of ternary vanadates, manganese vanadate has good electrochemical performance and optical performance, and can be applied in batteries and photoelectric materials. The method has great significance for the study of vanadium slag leaching mechanism and the development of subsequent products.

The application provides a surface-modified spinel lithium manganate positive electrode material and a preparation method and a lithium battery thereof, and the lithium battery is prepared by a solid-phase co-sintering method and a subsequent hydrothermal treatment method, and a core-shell structure with same composition elements but different element contents and valence states of the surface and the interior is obtained, wherein the inner core is spinel lithium manganate close to a stoichiometric ratio, and the surface is an amorphous lithium-manganese-oxygen layer with high lithium content and high manganese valence directly obtained through in-situ conversion; the lithium battery has better chemical bonding and mechanical stability, can effectively hinder the corrosion of electrolyte on the lithium manganate and inhibit the dissolution of Mn elements in the lithium manganate, and can remain stable in a long cycle process.

The present invention belongs to the technical field of lithium-ion batteries and provides a lithium manganate positive electrode material having a conductive protective layer and a preparation method thereof. The present invention comprises mixing manganese carbonate and lithium carbonate, followed by ball milling, primary sintering, and secondary sintering to produce a lithium manganate positive electrode material. The lithium manganate positive electrode material is then mixed with an acidic solution, followed by a hydrothermal reaction, drying, and sintering to produce a lithium manganate positive electrode material having a conductive protective layer. The preparation method of the present invention is simple and low-cost, and the conductive protective layer of the present invention can improve the low conductivity of the oxide protective layer while inhibiting electrolyte erosion of the positive electrode material.

The application belongs to the technical field of lithium batteries, and discloses a modified lithium manganate electrode material and a modification method thereof.The modification method comprises the following steps: mixing lithium manganate with a hydrogen peroxide solution to obtain the surface-modified lithium manganate electrode material.Through the surface modification method, the surface impurities of the spinel lithium manganate can be effectively removed without obvious influence on the crystal structure, the surface smoothness is improved, the diffusion rate of Li + is accelerated, the agglomeration of the spinel lithium manganate particles is effectively inhibited, and thus the phenomenon that the internal stress between the agglomerated particles causes micro-cracks on the surface of the material is effectively inhibited.The surface-modified lithium manganate electrode material has excellent electrochemical performance.The surface modification method is simple, low in cost, and suitable for industrial production.The application has low requirements on equipment, is simple to operate, has no special requirements on the production process, causes no pollution in the production process, and is friendly to the environment.

A cathode active material according to embodiments of the present disclosure includes: lithium metal oxide particles; and a conductive coating that partially covers the surface of the lithium metal oxide particles and includes a plurality of conductive particles. The conductive coating includes a first pattern having an island shape and a second pattern having a chain shape. According to embodiments of the present disclosure, the cathode active material may be formed by stirring lithium metal oxide particles and conductive particles using a resonant mixer. According to embodiments of the present disclosure, a lithium secondary battery including the above-described cathode active material may be provided.

The invention relates to the technical field of recycling of waste lithium ion batteries, in particular to a method for preparing a lithium-rich manganese-based positive electrode material by recycling waste lithium ion batteries. The method comprises the following steps: mixing the positive electrode material of the waste lithium ion battery with ammonium sulfate, and roasting in an oxygen-free atmosphere to obtain a roasted product; the roasted product is mixed with water for leaching treatment, and leaching liquid rich in lithium and manganese is obtained; mixing the leachate with a carbonate precipitant solution, and carrying out a co-precipitation reaction to obtain a precursor; and roasting the precursor to obtain the lithium-rich manganese-based positive electrode material. According to the method, an ammonium sulfate-assisted low-temperature salinization roasting technology is adopted, and efficient selective synergistic extraction of lithium and manganese is realized based on the difference of properties of metal elements. Besides, the obtained leaching solution rich in lithium and manganese does not need complex purification treatment and can be directly used for integrally synthesizing the precursor of the high-performance lithium-rich manganese-based positive electrode material, the technological process is simple, and the resource recovery efficiency is high.

To provide a sodium ion battery cathode material, and a preparation method therefor and application thereof.SOLUTION: A general chemical formula of a cathode material is NamNixFeyMnzO2. In the general chemical formula, 0.1≤x≤0.25, 0.5≤y≤0.8, 0.1≤z≤0.25, 0.8≤m≤1.1, 0.95≤x / z≤1.05, and x+y+z=1, m, x, y and z are molar percentages of corresponding elements, respectively, and each component in the general chemical formula satisfies charge conservation and stoichiometry conservation. A preparation method includes the steps of: preparing a precursor including a nickel source, an iron source and a manganese source with required stoichiometry by a co-precipitation method; mixing the precursor of the nickel source, the iron source and the manganese source with a sodium source in a certain proportion, and then adding a doping element for primary sintering to obtain a doped sodium ion battery cathode material; and carrying out secondary sintering on the doped sodium ion battery cathode material and a coating to obtain a final sodium ion battery cathode material.SELECTED DRAWING: Figure 1

Disclosed are a positive electrode active material for an all-solid-state rechargeable battery, a preparation method thereof and a rechargeable lithium battery, the positive electrode active material which includes a first positive electrode active material including secondary particles including a lithium nickel-cobalt-aluminum-based composite oxide and formed by agglomerating a plurality of primary particles wherein at least a portion of the primary particles are oriented radially, and a buffer layer disposed on the surface of the secondary particles and including a lithium compound and a metal oxide; and a second positive electrode active material including secondary particles including a lithium nickel-cobalt-aluminum-manganese-based composite oxide and formed by agglomerating a plurality of primary particles, and a buffer layer disposed on the surface of the secondary particles and including a lithium compound and a metal oxide, wherein an average particle diameter of secondary particles of the first positive electrode active material is larger than an average particle diameter of the secondary particles of the second positive electrode active material.

The present invention belongs to the field of antibacterial materials, and in particular relates to a piezoelectric photocatalytic antibacterial material and its preparation method and application. The method comprises: x Zn 1‑x A manganese source and a zinc source are separately mixed with an alkaline sodium compound solution and bentonite, and then subjected to low-speed ball milling and autothermal ball milling, respectively, to obtain the piezoelectric photocatalytic antibacterial material; wherein: 0<x<1. The piezoelectric photocatalytic antibacterial material prepared by the present invention has strong piezoelectricity and, while having high adsorption capacity, its positive charge interferes with bacterial activity, thereby achieving effective antibacterial and odor-removing effects. The preparation process is characterized by simple operation, low energy consumption, economical practicality, and a short production cycle.

The present invention provides a carbon dioxide reduction catalyst capable of reducing carbon dioxide under mild conditions, a carbon dioxide reduction method using the carbon dioxide reduction catalyst, and a carbon dioxide reduction apparatus. A metal oxide of the present invention has a spinel-type crystal structure including a metal element A, manganese, and oxygen. The A is at least one metal element selected from the group consisting of nickel and copper, a molar composition ratio of manganese to oxygen is from 1:1.8 to 1:2.2, and a molar composition ratio of the metal element A to manganese is from 1:1.7 to 1:2.3. In an X-ray diffraction pattern obtained by X-ray diffraction measurement using a Cu-Kα ray, the metal oxide has an intensity ratio (I18° / I37°) of 0.2 or more between a peak having a 2θ value in a range of from 16° to 20° (P18°) and a peak having a 2θ value in a range of from 35° to 39° (P37°).

A sodium ion battery positive electrode material and a preparation method therefor, a positive electrode sheet, a secondary battery, and an electrical device, relating to the field of sodium ion battery positive electrode materials. The sodium ion battery positive electrode material comprises a core and a coating layer that coats the outer surface of the core, wherein the material of the core is an O3-type layered oxide, and the material of the coating layer is a P2-type layered oxide. In the sodium ion battery positive electrode material, the P2-type layered oxide forms a protective layer on the surface of the O3-type oxide, thereby enhancing the structural integrity and stability of the O3-type layered oxide; in addition, the P2-type coating layer can provide a rapid sodium ion diffusion channel, such that the sodium ion battery positive electrode material having a core-shell structure has excellent cycle performance.

The invention discloses a 1, 3-propane diamine intercalated potassium manganese oxide positive electrode material, a preparation method thereof and an application of the 1, 3-propane diamine intercalated potassium manganese oxide positive electrode material in an aqueous zinc ion battery, and belongs to the technical field of materials. The preparation method comprises the following steps: dissolving potassium permanganate and 1, 3-propane diamine in deionized water, stirring, adjusting the pH value of the solution, transferring the mixed solution into a stainless steel reaction kettle with a polytetrafluoroethylene lining, carrying out a hydrothermal reaction, cooling to room temperature, carrying out centrifugal cleaning, and carrying out vacuum drying to obtain the positive electrode material DP-KMO. DP-KMO is prepared through a simple one-step hydrothermal method, DP is inserted into the electrode material through further reaction, the introduction of DP not only enlarges the interlayer spacing of KMO, but also participates in the storage of zinc ions, increases the active sites of the KMO, effectively promotes the diffusion of ions and charge transfer, improves the conductivity of the material, reduces the internal resistance of the material, and improves the electrochemical performance of the material. And the structural flexibility and stability of the material are maintained, so that the overall performance of the water-based zinc ion battery is improved.