94results about "Manganese oxides/hydroxides" patented technology

The invention discloses a positive electrode material formed by compounding polyanionic sodium ferric sulfate and a layered transition metal oxide, and a preparation method and application thereof, and the preparation method comprises the following steps: preparing a sodium ferric sulfate positive electrode material, preparing a layered transition metal oxide positive electrode material, and mechanically mixing the sodium ferric sulfate and the layered transition metal oxide material, the composite material is obtained. The production process of the two materials is easy for large-scale production, has high similarity with the existing battery industrial equipment, is simple in method for compounding the two materials, and has large-scale industrial application value. The composite material has the stability of a polyanionic material and the high energy density of a layered oxide material, and has more excellent comprehensive electrochemical performance.

The application discloses a method for selectively extracting metals from waste ternary lithium batteries by using a eutectic solvent. The method uses a eutectic solvent DES synthesized by choline chloride and oxalic acid as an extraction agent, quotes dimethyl sulfoxide DMSO and water as diluents, introduces a circulation and extraction step on the basis of metal element series immersion, i.e. extracts lithium oxalate from the leaching solution with ethanol and recycles the DES by fractional distillation, and makes innovations in recycling of metal lithium and recycling of the DES. The application has the advantages of high efficiency extraction, high precision purification, innovative extraction of lithium element and innovative recovery of the reagent DES.

This invention belongs to the field of biochemical detection and discloses a portable hepatitis biomarker detection kit. The kit contains a hydrogel; the hydrogel is obtained by dispersing hollow manganese dioxide in water to obtain an H-MnO2 dispersion, mixing the H-MnO2 dispersion with sodium alginate solution to obtain a mixed solution, and then adding a calcium salt solution to obtain the hydrogel. The hollow manganese dioxide is obtained by etching manganese Prussian blue analog nanoparticles with sodium hydroxide. The manganese Prussian blue analog nanoparticles are prepared from potassium ferricyanide, polyvinylpyrrolidone, and manganese salts. This invention utilizes the color change of hollow manganese dioxide in relation to TMB to construct a method for detecting hepatitis biomarkers using a smartphone to capture signals. This kit reduces the detection cost of hepatitis biomarkers, does not require large instruments, and is highly portable and widely applicable, possessing great potential as a novel point-of-care testing device.

A method for preparing a two-dimensional porous oxide belongs to the technical field of porous oxide preparation. The method includes the following steps: (1) using a metal salt as a precursor, an ion-intercalated two-dimensional oxide is prepared by a molten salt method; (2) the ion-intercalated two-dimensional oxide is mixed with a lithium initiator, reacted for a predetermined time, and then the unreacted lithium initiator is removed, filtered, and washed to obtain the two-dimensional porous oxide. The two-dimensional porous oxide prepared by this method forms uniform pores with a pore size range of 2-10 nm and a specific surface area of ​​200-300 m². 2 / g.

A system for the synthesis of zinc oxide, iron oxide and manganese oxide nanoparticles by means of green synthesis using pea shell biomass extract as a reducing agent, wherein the nanoparticles have sizes in the range of 40-120 nm, which were confirmed by UV-Vis absorption, FTIR and FESEM.

An electrochemical device includes a positive electrode plate. The positive electrode plate includes a positive active material layer. The positive active material layer includes a positive active material. After the electrochemical device is discharged, a molar fraction of an M1 element in the positive active material included in the positive electrode plate in a fully discharged state is a. The M1 element includes Ni, Co, and Mn. A molar fraction of Ni in the positive active material is b. A molar fraction of Mn in the positive active material is c. A molar fraction of an M2 element in the positive active material is d. The M2 element includes at least one of Na, K, or Mg. The value of b / a is 0.4 to 0.6, the value of c / a is 0.4 to 0.6, and the value of d / a is 0.04 to 0.06.

Provided is a producing method of granulated body for lithium adsorption that allows sufficiently suppressing a manganese elution in an eluting step when producing lithium on a commercial basis. A producing method of granulated body for lithium adsorption includes a kneading step of kneading a powder of a lithium adsorbent precursor and a binder to obtain a kneaded product, a granulating step of granulating the kneaded product to obtain a 1st granulated body, and a sintering step of sintering the 1st granulated body to obtain a 2nd granulated body. The configuration allows a manganese valence contained in the lithium adsorbent precursor to change from 2 to 4, and thus allowing the suppressed manganese elution in the eluting step. Further, in production on a commercial basis, the lithium adsorbent can be used repeatedly. In addition, a manganese concentration in an eluent obtained in the eluting step can be suppressed, thus allowing loads in steps after the eluting step to be reduced.

The invention provides a method for recycling metal from a waste ternary lithium battery positive electrode material. The method comprises the following steps: mixing the waste ternary lithium battery positive electrode material, a binder, a conductive agent and an organic solvent to prepare mixed slurry; coating a current collector with the mixed slurry to obtain an electrode plate; taking the electrode plate as an anode, taking an inert electrode as a cathode, dividing the electrolytic tank into an anode chamber and a cathode chamber by adopting a lithium ion selective permeable membrane, and carrying out oxidation-reduction reaction, so that transition metal ions are dissolved out from electrolyte of the anode chamber, and lithium phosphate precipitates are formed in the cathode chamber; and carrying out post-treatment on the electrolyte in the anode chamber to obtain the nickel-cobalt mixed metal salt. According to the method, the problems of low lithium purity, incomplete transition metal separation, complex process and the like in the traditional recovery technology are solved, and an efficient, environment-friendly and controllable process path is provided for high-valued recovery of valuable metals of the waste ternary lithium batteries.

To provide a method for recovering metallic zinc from solid metallurgical waste containing zinc and manganese.SOLUTION: A. contacting the solid metallurgical waste with an aqueous leaching solution comprising chloride ions and ammonium ions to produce one or more leachates comprising zinc ions and manganese ions and one or more insoluble solid residues; b. cementing the leachate by adding metallic zinc as a precipitating agent to remove one or more metals other than zinc and manganese present in ionic form in the leachate; B. producing a purified leachate; and c. subjecting the purified leachate to electrolysis in an electrolytic cell comprising one or more cathodes and one or more anodes to deposit metallic zinc on the cathodes and produce one or more effluent leachates. The method comprises, prior to the electrolysis, the step of precipitating manganese ions by oxidation with permanganate ions and subsequently separating the sediment containing MnO2.SELECTED DRAWING: Figure 1

The application relates to an activation method of a high-loading manganese dioxide electrode material, in particular to in-situ growth of a high-loading manganese dioxide electrode material with a loading of greater than or equal to 15 mg cm ‑2 on a flexible carbon cloth surface, taking the high-loading manganese dioxide electrode material as a working electrode, taking a metal Pt sheet as a counter electrode, adopting a two-electrode system, activating the high-loading manganese dioxide in a zinc nitrate solution through cyclic voltammetry scanning, and the activated high-loading manganese dioxide exhibits excellent electrochemical properties. The application adopts an electric activation method to improve the electrochemical activity of the high-loading manganese dioxide, has the advantages of simple process, convenient operation and the like, and the activated high-loading manganese dioxide electrode material can be used for electrochemical energy storage.

A process for preparing metal oxide comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum. The process comprising:reacting a metal sulfate comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum with lithium hydroxide and optionally a chelating agent to obtain a solid comprising a metal hydroxide comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum, and a liquid comprising lithium sulfate, the metal sulfate comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum;separating the liquid and the solid from one another to obtain the metal hydroxide;submitting the liquid comprising lithium sulfate to an electromembrane process for converting the lithium sulfate into lithium hydroxide; andreusing at least a first portion of said lithium hydroxide obtained by the electromembrane process for reacting with the metal sulfate;reacting at least a second portion of said lithium hydroxide obtained by the electromembrane process with the obtained metal hydroxide to obtain a mixture of metal hydroxides; androasting said mixture of metal hydroxides to obtain the metal oxide.

The invention discloses a preparation method and application of a nano manganese oxide compound, and the preparation method comprises the following steps: dissolving an amino siloxane compound in water containing dissolved oxygen to obtain 8lt; an aqueous solution of an aminosiloxane compound having a pH < = 12; adding a Mn < 2 + > solution into the amino siloxane compound aqueous solution, and reacting at room temperature; and after the reaction is performed for preset time, adding acid to terminate the reaction to obtain a nano manganese oxide dispersion liquid, and centrifugally washing to obtain the nano manganese oxide. The preparation method is mild in reaction condition, the nano manganese oxide can be rapidly prepared, the obtained nano manganese oxide has oxidase-like catalytic activity, and a nitrite detection system constructed based on the nano manganese oxide has the characteristics of low detection limit, high sensitivity, strong anti-interference performance, good selectivity and the like.

This invention discloses a method for preparing high-purity manganese dioxide, an oxygen electrode catalyst for zinc-air batteries. Addressing the environmental problems associated with using concentrated sulfuric acid or nitric acid as catalysts in the preparation of manganese dioxide for oxygen reduction batteries, as well as the corrosion of production equipment and safety hazards to operators during the production process, this invention proposes a method using a solid acid catalyst, acidic cation exchange resin, to replace concentrated sulfuric acid or nitric acid as the acid catalyst for preparing manganese dioxide for oxygen reduction batteries. Acidic cation exchange resins, especially strongly acidic cation exchange resins, contain sulfonic acid groups, which can completely ionize to release hydrogen ions, thus replacing sulfuric acid or nitric acid as the acid catalyst for preparing manganese dioxide. Furthermore, strongly acidic cation exchange resins can be regenerated and recycled.

The present invention provides a method for producing a positive electrode active material for alkali ion secondary batteries, the positive electrode active material containing a large amount of a transition metal, while enabling a battery to operate.　A method for producing a positive electrode active material for alkali ion secondary batteries, the positive electrode active material containing 34% by mole or more of CrO + FeO + MnO + CoO + NiO. This method for producing a positive electrode active material for alkali ion secondary batteries is characterized by comprising: a step for preparing a positive electrode active material precursor that contains crystals; and a step wherein at least some of the crystals are melted and amorphized by irradiating the positive electrode active material precursor with light.

The present application relates to the technical field of hydrometallurgy, and discloses a method for preparing hydroxide from reverse copper-manganese solution, which comprises the following steps: controlling the potential of the reverse copper-manganese solution to carry out sulfidation copper deposition, so as to obtain a copper deposition solution; adjusting the pH of the copper deposition solution to 4-6, mixing the copper deposition solution with manganese powder to carry out manganese-zinc replacement, and obtaining zinc-manganese slag and a zinc deposition solution after sufficient reaction; mixing the zinc-manganese slag with sufficient zinc-dissolving alkali solution to carry out reaction, and obtaining manganese slag and the zinc-dissolving solution after solid-liquid separation; adjusting the pH of the zinc-dissolving solution to 7-8, and carrying out solid-liquid separation after sufficient reaction, so as to obtain zinc hydroxide. The method has a short overall process, good separation and purification effect, and can obtain crude manganese hydroxide and zinc hydroxide products.

The application belongs to the field of new energy, and discloses a recycling method of a lithium manganese iron phosphate positive electrode material, which comprises the following steps: step 1: performing aerobic roasting on black powder containing the lithium manganese iron phosphate positive electrode material; step 2: dispersing the product of step 1 into an acidic water body to obtain a solution; and step 3: extracting corresponding elements from the solution in the order of first extracting iron elements and then extracting copper elements; wherein Cu 2+ is precipitated from the solution by a precipitant. The method adopts an oxygen-rich or aerobic calcination mode to make metal elements form oxides, so as to facilitate acidolysis; according to the pH law of extraction of each metal element, copper is extracted after iron, and the copper is obtained by using a precipitation method, so that the problem that copper and iron cannot be effectively distinguished during oxygen-rich or aerobic calcination can be effectively avoided.

Disclosed are a positive electrode for a rechargeable lithium battery, and a rechargeable lithium battery including the positive electrode. The positive electrode for a rechargeable lithium battery includes a positive electrode current collector, a first positive electrode active material layer on the positive electrode current collector and including a first positive electrode active material including a lithium iron phosphate-based compound, and a second positive electrode active material layer on the first positive electrode active material layer and that includes a second positive electrode active material including a lithium nickel-based composite oxide and a third positive electrode active material including a lithium manganese-based oxide.

This invention relates to a method for preparing nano metal oxides and its use. The preparation method involves reacting a low-purity initial alloy containing the target metal element M and Al / Zn with a heated concentrated alkaline solution. Under specific reaction conditions, the initial alloy undergoes intense hydrogen evolution and Al / Zn-removal reaction, resulting in nanoscale fragmentation, followed by shape and composition reconstruction to form nano M oxides. Through further post-treatment, crystalline nano M oxides or modified nano M oxides can be obtained. This method is simple, fast, cost-effective, and suitable for large-scale production. It enables the preparation of nano metal oxides with various crystallinities, which have promising applications in fields including composite materials, catalytic materials, ceramic materials, refractory materials, advanced electronic materials, battery materials, chromogenic materials, wave-absorbing materials, wastewater degradation materials, antimicrobial materials, coatings, pigments, thermal spray materials, and sensors.

The application discloses a kind of metal ion doped dimanganese trioxide, preparation method and application thereof, manganese salt and metal nitrate are dissolved in glycerol and isopropyl alcohol, the ratio of manganese salt, metal nitrate and glycerol is (0.5-2) mmol: (0.1-0.5) mmol: (4-8) mL, to obtain mixed solution;The mixed solution is kept at 160-200 DEG C, and then the precipitate in the obtained reaction liquid is separated and then washed, dried, to obtain metal ion doped manganese glycerate;Metal ion doped manganese glycerate is calcined at 700-800 DEG C in oxygen atmosphere, to obtain metal ion doped dimanganese trioxide, by metal ion doping, adjust the electronic structure of dimanganese trioxide, improve the conductivity and optimize the ion transmission characteristics, to realize higher specific capacity, longer cycle life and better charge-discharge performance.

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.

A heat storage material according to the present invention is characterized in that: said heat storage material contains a layered manganese oxide (100) which is represented by formulae (1) and (2) and which has a delta-type crystal structure; and the thickness of the layered manganese oxide (100) in the C-axis direction is 15 nm or less.　(1): AxMnO2 ⋅ H2O [In formulae (1) and (2): A is a symbol collectively representing elements A1, A2, ..., Am for maintaining a delta-type crystal structure; m is an integer greater than or equal to 1; X1, X2, ..., Xm respectively represent the composition ratios of the elements A1, A2, ..., Am, are numbers 0.00-0.50, and satisfy 0.00 < X1 + X2 + ... + Xm ≦0.50; and n is a number 0.00-2.50.]

The present invention provides a method (100a) and system for controlling the operation of a chemical plant arranged to carry out a chemical process which produces iron and / or manganese in elemental form from respective oxides thereof using liquid sodium as a reductant of the respective oxides and which can also produce an oxide or hydroxide of at least one of calcium, magnesium and iron from a carbonate mineral of at least one of calcium, magnesium and iron. The method (100a) comprises assigning (103a) a respective value to the no. of mol of each one of the chemical species involved in the chemical process as starting materials and products thereof, subject to constraints which are derived from the law of conservation of mass of the constituent elements of those chemical species. The method also assigns (103b) respective values to the nos. of mol of chemical species which are consumed during the chemical process by electrolytic or thermochemical decomposition into their constituent elements, subject to another set of constraints which are derived from the minimum requirements for these constituent elements by the chemical process itself. The former set of constrains allows the materials balance of the process to be controlled and the latter set of constraints allows the energy balance of the process to be controlled. The method then comprises operating (104) the chemical plant to carry out the process according to the values thus assigned. Respective values may be assigned (103a, 103b) to the nos. of mol of a preferred subset of the chemical species involved in the process as starting materials and products thereof and / or a preferred subset of the chemical species which are consumed during the process by electrolytic or thermochemical decomposition into their constituent elements, before values are then assigned to remaining ones of the nos. of mol of other chemical species not in the preferred subset. This allows the chemical plant to be operated in such a way as to optimise its performance relative to such variables as the respective nett amounts of a preferred one or more of the materials it consumes and / or produces, the energy efficiency of a part or the whole of the chemical process and / or its cost effectiveness, for example. Amongst other things, the constraints also ensure that the chemical process always produces less carbon dioxide than instead calcining a carbonate mineral of at least one of calcium, magnesium and iron to produce its corresponding oxide, and that in a large number of cases, it can produce no carbon dioxide at all. Also disclosed is a graphical technique which may be used to assign the respective values to the nos. of mol of the chemical species involved in the chemical process subject to the stated constraints, whereby the method and system of the invention may be implemented.

The application discloses a method for preparing nano-oxide powder by solid-phase hot injection, and utilizes inorganic metal salt and organic ligand to prepare metal-organic complex as metal precursor; under inert atmosphere, a synthesis solvent is heated, then the metal precursor is directly added in solid form, heat preservation reaction is carried out, and the organic ligand is recovered; the polar solvent is added into the mixed solution after heat preservation reaction, solid-liquid separation is carried out to obtain solid-phase product and liquid-phase mixed solvent; the nano-oxide powder is obtained by calcining the solid-phase product, and the synthesis solvent and the polar solvent are recovered by separating the liquid-phase mixed solvent. By the solid-phase hot injection, the same amount of synthesis solvent can be converted into more precursor to corresponding high-quality nano-particles without incomplete nucleation or particle agglomeration, the recovery rate of the organic ligand can be adjusted by selecting the synthesis solvent, and the synthesis solvent and the polar solvent in the solution after reaction are recycled.

The application provides a preparation method of a composite aerogel with room-temperature aldehyde-removing and sterilization functions, and the aerogel is a graphene composite aerogel loaded with silver-manganese dioxide. The composite aerogel has a three-dimensional porous structure, which provides a physical adsorption space for capturing gaseous formaldehyde. The loading of silver-manganese dioxide provides a chemical oxidation site for catalytic degradation of formaldehyde. The composite aerogel not only realizes the function of efficiently degrading gaseous formaldehyde at room temperature, but also has good antibacterial and sterilization effects. In the application, divalent manganese salt and persulfate are reacted under alkaline conditions to obtain manganese dioxide (delta type), which is used as a carrier. Silver ions are in-situ generated into silver particles under the action of a reducing agent citrate, and then silver-modified manganese dioxide is obtained. The obtained silver-manganese dioxide is fully mixed in a graphene oxide dispersion liquid, and a composite hydrogel is obtained after hydrothermal reaction. The graphene composite aerogel loaded with silver-manganese dioxide can be obtained after freeze-drying.

This invention discloses a method for preparing a flame-retardant epoxy resin containing a recyclable flame retardant and its application. The method for preparing the flame retardant includes: preparing a manganese cobalt oxide flame retardant through the co-precipitation of manganese and cobalt ions followed by calcination. This invention synthesizes a manganese cobalt oxide flame retardant via a co-precipitation method and uses it as a filler in epoxy resin, curing it to obtain a green, halogen-free, environmentally friendly flame-retardant epoxy resin. It does not pollute the environment during pyrolysis or combustion and can effectively catalyze the conversion of harmful gases generated during combustion, which is beneficial to environmental protection and sustainable development. It has excellent flame-retardant properties, greatly reducing the release of heat, smoke, and harmful gases during epoxy resin combustion, significantly enhancing its fire safety. Furthermore, it enables efficient recovery of the flame retardant from the epoxy resin, with a recovery rate of up to 90.0%, achieving high-quality resource utilization.

A cathode composition for a battery has the general formula Mg1+xMn1-xO2; wherein the value of x is greater than 0 and less than 1. Preferably, x ≤ 0.3, and most preferably the composition comprises M

The present invention relates to a method and system for preparing a metal oxide precursor for a battery by means of the spray pyrolysis of a nitrate. The method comprises: preparing a metal nitrate mixed solution; atomizing the metal nitrate mixed solution and spraying same into a reaction furnace, and then pyrolyzing same in different heating zones in the reaction furnace, so as to obtain a metal oxide mixture and high-temperature flue gas; subjecting the high-temperature flue gas to a waste heat recovery treatment, and then conveying same to a regeneration device for recovery, so as to obtain regenerated nitric acid; and subjecting the metal oxide mixture to secondary heating at the bottom of the reaction furnace. In the present invention, the metal oxide precursor is prepared by means of spray pyrolysis, and compared with a traditional coprecipitation and calcination process, the method is more economical and has lower operation costs; moreover, since different heating zones are used for pyrolysis, the method has a wider range of application, and can be used for metal nitrates having different pyrolysis temperatures.

This invention discloses a method for preparing a carbon-coated manganese oxide / manganese sulfide composite cathode material. First, manganese dioxide nanotubes are prepared using a hydrothermal method. Then, the manganese dioxide nanotubes are completely or partially sulfided to obtain manganese oxide / manganese sulfide. Next, a conductive polymer is coated onto the surface of the manganese oxide / manganese sulfide nanoparticles. Finally, the resulting manganese oxide / manganese sulfide nanoparticles with the conductive polymer coating are placed in a tube furnace and treated at high temperature for a certain period of time to obtain the carbon-coated manganese oxide / manganese sulfide composite cathode material. This carbon-coated manganese oxide / manganese sulfide nanocomposite material, as a cathode material for zinc-ion batteries, avoids direct contact between the electrolyte and the active material due to the carbon coating, preventing material dissolution and improving cycle life. The heterogeneous structure of manganese oxide / manganese sulfide enhances the electrochemical activity of the material, solving the problem of poor conductivity in traditional manganese oxide materials.

The present disclosure provides a copper-containing sodium-ion battery cathode material precursor, a preparation method thereof, and an application thereof. The copper-containing sodium-ion battery cathode material precursor has a core-shell structure, and the core-shell structure includes a core and multiple outer shells coated on the surface of the core; the core is M y (OH)2, where 0 < y < 1, and M is a metal element other than copper; the multiple outer shells are Cu(OH)2 layers and M y (OH)2 layers that are alternately stacked in sequence along the direction away from the core, and the outermost layer of the multiple outer shells is a Cu(OH)2 layer. The precursor designed in the present disclosure can make Cu evenly distributed in the precursor bulk phase, reduce the phenomenon of uneven diffusion, and make the performance of the prepared copper-containing sodium-ion battery cathode material more excellent. Moreover, the preparation method of this structure effectively avoids the problem that Cu ions and other metal ions are difficult to co-precipitate, solves the problems of low Cu precipitation rate and Cu ion loss under high ammonia conditions, makes the utilization rate of metal ions reach 100%, and solves the related problems at the industrialization end.

To provide at least one of an industrially applicable manufacturing method of a manganese sulfate solution, that does not generate jarosite and comprises a step of selectively removing potassium from a sulfuric acid acidic manganese solution; and a manufacturing method of manganese oxide using the manganese sulfate solution.SOLUTION: A manufacturing method of a manganese sulfate solution comprises a step of adsorbing a potassium ion on a zeolite by making a molar ratio of silica to alumina be 6 or more, and bringing the manganese sulfate solution containing the potassium ion into contact with the zeolite containing an oxygen 8-membered ring in a skeletal structure.SELECTED DRAWING: None