140results about "Manganates/permanganates" patented technology

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.

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.

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 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.

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.

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.

The invention relates to a sensitive layer material for an ozone sensor and a preparation method thereof, the sensitive layer material is a manganese oxide composite material, the chemical general formula is AxByMnzOv, the structure of the prepared manganese oxide composite material is single crystal, polycrystal and / or amorphous state, the specific surface area is 10-600m < 2 > / g, and ozone can be adsorbed; the proportion of Mn < 3 + > / Mn < 4 + > can be regulated and controlled by adding the metal A and the metal B, and the O3 adsorption site density is improved. The manganese oxide composite material promotes rapid migration of electrons after O3 adsorption, shortens the response time, has high response rate, short recovery time, large specific surface area and good stability, and has excellent sensitivity when low ozone is detected; the material can be used as a sensitive layer material in an ozone sensor.

The invention discloses a defect-state manganese-vanadium oxide positive electrode material and a preparation method and application thereof, and belongs to the technical field of battery materials, the defect-state manganese-vanadium oxide positive electrode material is MnxV2O6-y, 0 lt; xlt; 1, 0lt; yt; Yt; 1, the defect-state manganese vanadium oxide positive electrode material is synthesized by taking vanadium pentoxide and a divalent manganese-based compound as raw materials; vanadium pentoxide is adopted as a precursor, the vanadium pentoxide is treated through a hydrothermal method and a calcination method, the defect-state manganese-vanadium oxide material with manganese vacancy and oxygen vacancy can be successfully prepared, and the material has excellent structural stability, good conductivity and high electrochemical activity. When the defect-state manganese vanadium oxide positive electrode material is applied to an energy storage battery, relatively high electrochemical performance and excellent cycling stability can be shown.

The invention discloses a hydrophilic perovskite material and a preparation method and application thereof. The chemical formula of the hydrophilic perovskite material is AxByXz, A-site elements and B-site elements comprise K, Na, Mg, Ca, Sr, Ba, Bi, Sn, Pb, Zn, Ti, V, Cr, Mn, Fe, Co, Ni, Cu and the like, and X comprises O or OH; the surface of the hydrophilic perovskite material has hydrophilic functional groups. The invention also discloses a hydrophilic perovskite material carbon composite material, which comprises a hydrophilic perovskite material and a carbon matrix material. The invention also discloses a hydrophilic perovskite coating formed by the hydrophilic perovskite material or the hydrophilic perovskite material carbon composite material. The hydrophilic perovskite coating has a dynamic regulation effect on the surface of the zinc negative electrode, so that the ion flux is homogenized, the uniform deposition of Zn < 2 + > ions is promoted, the appearance and growth of zinc dendrites are effectively inhibited, and the cycle performance of the battery is improved.

The present disclosure provides a process for recycling sorbent used in a process for extracting lithium from an aqueous solution containing lithium. The process may comprise bringing an aqueous solution containing lithium into contact with a hydrogen manganese oxide sorbent to absorb the lithium to produce a lithium loaded sorbent and lithium depleted solution, separating the lithium loaded sorbent and the lithium depleted solution, bringing the lithium loaded sorbent into contact with an acid to produce a lithium rich liquor and regenerated sorbent, separating the lithium rich liquor and the regenerated sorbent, treating the separated lithium rich liquor with a carbonate and / or hydroxide to precipitate manganese carbonate and / or manganese hydroxide, separating precipitated manganese carbonate and / or manganese hydroxide from the lithium rich liquor, and heating the manganese carbonate and / or manganese hydroxide with a source of lithium to produce a regenerated lithium loaded sorbent which is reused in the process. The disclosure also provides a system for recycling sorbent used in a process for extracting lithium from an aqueous solution containing lithium.

Provided is a solid-state battery which has more sufficiently excellent low-temperature densification characteristics and moisture resistance. The present invention relates to a solid-state battery having an outer packaging part and an insulating part, in which at least one of the outer packaging part and the insulating part contains an oxide ceramic, and the oxide ceramic contains: Li (lithium); mg (magnesium); one or more elements MI selected from the group consisting of Group 4 and Group 5 elements; and one or more elements MII selected from the group consisting of transition metal elements.

Provided are: a carbon dioxide reduction catalyst that can reduce carbon dioxide under mild conditions; a carbon dioxide reduction method using the carbon dioxide reduction catalyst; and a carbon dioxide reduction apparatus. The metal oxide according to the present invention has a spinel-type crystal structure comprising a metal element A, manganese and oxygen. The A comprises at least one metal element selected from the group consisting of nickel and copper, the (manganese) / (oxygen) molar compositional ratio is 1:1.8 to 1:2.2, and the (metal element A) / (manganese) molar compositional ratio is 1:1.7 to 1:2.3. The metal oxide is characterized in that the ratio of the intensity of a peak having a 2θ value of 16° to 20° (P18°) to the intensity of a peak having a 2θ value of 35° to 39° (P37°) in an X-ray diffraction pattern obtained by an X-ray diffraction measurement using Cu-Kα line, i.e., I18° / I37°, is 0.2 or more.

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.

It relates to a material comprising a plurality of nanorods encapsulated within open-ended hollow carbon nanostructures, wherein the plurality of nanorods is composed of either a) a transition metal oxide of the formula AzM'2 yMn1 -xO2 (A), or alternatively, b) a transition metal oxide of the formula M''3m / nM2-mO3 (B), as defined herein, wherein the transition metal oxide of the formula (A) or formula (B) is in an amount from 20 to 60% by weight with respect to the total material weight; and the volume of the nanorods encapsulated within hollow carbon nanostructures is equal to or less than 50% with respect of the total cavity volume of the hollow carbon nanostructures, in particular, wherein the hollow carbon nanostructures are tubular and their internal average diameter is at least 2 times the average thickness of the nanorods. It also relates to a process for preparing this material, to a precursor material RtM'''3-tO4 (C) as defined herein from which the material is obtained, and to the use of the material as electrocatalyst in different applications.

Novel compounds having a sortovite-related structure are disclosed. The compounds may be colored and are useful as pigments. The compounds are durable in terms of acid stability tests, which show that the pigments do not substantially discolor when exposed to weak acids such as rain. The compounds disclosed herein are typically inexpensive to synthesize from earth-abundant, environmentally friendly elements or minerals, and therefore offer advantages over existing pigments in the art.

To provide a positive electrode active material that can maintain the high electrochemical properties of an existing positive electrode active material for a lithium secondary battery, particularly a high-Ni type positive electrode active material, while eliminating the low structural stability.SOLUTION: A positive electrode active material includes a lithium composite oxide having a layered structure capable of lithium intercalation / deintercalation, and the ratio of peak intensities attributable to the (003) plane and the (012) plane obtained by X-ray diffraction analysis of the lithium composite oxide using Cu-Kα radiation satisfies the formula 1 of 0.131≤I(012) / I(003)≤0.143.SELECTED DRAWING: Figure 3

The invention discloses a synthesis method of a low-cost mixed single crystal lithium ion battery lithium manganate positive electrode material, which comprises the following steps: (1) weighing manganese salt, transferring into equipment with a mixing function, adding a complexing agent, and uniformly mixing; (2) adding alkali into the mixture in the step (1), and fully mixing; the alkali is sodium hydroxide, sodium carbonate, sodium bicarbonate or a mixture thereof; and (3) transferring the mixture obtained in the step (2) to a roasting furnace, roasting at high temperature to obtain a manganese-based precursor, mixing the obtained manganese-based precursor with a lithium source, and roasting to obtain the lithium manganate positive electrode material. According to the invention, the synthesis process is simplified, the solid-phase reaction efficiency is improved, and the lithium manganate positive electrode material of the lithium ion battery, which has a mixed single-crystal structure and is low in cost and excellent in performance, can be prepared.

Cathodes and electrochemical cells are provided, wherein a barium, bismuth, or nickel additive is included to increase the stability of manganese dioxide at high voltage. The metal additives provided herein improve the performance of electrochemical cells.

This invention belongs to the field of battery cathode material technology, specifically relating to a core-shell structured manganese tetroxide, its preparation method, and its application. The preparation method of the core-shell structured manganese tetroxide of this invention includes the following steps: (1) adding PEG, ZIF-8, and Zn to a container containing a manganese sulfate solution. 2+ (1) Ammonia solution is introduced into the container and heated to react; (2) After the reaction is completed, the solid and liquid are separated, and the obtained solid is washed and dried to obtain an intermediate product; (3) The intermediate product is calcined to obtain the core-shell structured manganese tetroxide. The core-shell structured manganese tetroxide of the present invention helps to solve the problems of rapid cycle decay, poor rate performance or insufficient compaction density in the sintering preparation process of lithium manganese oxide using manganese tetroxide in the prior art.

A lithium-containing oxide having a cationic-disordered rock salt-type structure,in which, when a solid 7Li-NMR spectrum has been measured, a signal 1 having a half width of more than 0 ppm and 40 ppm or less and a signal 2 having a half width of more than 100 ppm and 2000 ppm or less are observed in a range of a chemical shift of −3000 to 3000 ppm for which a peak of a 1 mol / L LiCl aqueous solution is set to 0 ppm, andan integrated intensity of the signal 1 relative to a total of integrated intensities of the signal 1 and the signal 2 is more than 0% and 60% or less.