286results about "Manganese oxides/hydroxides" patented technology

The invention discloses an iron-doped manganous-manganic oxide material and a preparation method and application thereof.According to the iron-doped manganous-manganic oxide material and the preparation method and application thereof, manganese sulfate serves as a manganese source, DTPA ferric ammonium salt serves as a complexing agent and a doping agent, ammonia water serves as alkali liquor, ethyl alcohol serves as a dispersing agent, and the preparation process is optimized in a targeted mode; the iron-doped manganous-manganic oxide material with uniform particle size distribution is prepared, the doping uniformity of the iron element in large-size micron-sized manganous-manganic oxide particles is improved while the sulfur content in the material is reduced, and the product is good in particle size uniformity and high in tap density. In addition, the process provided by the invention also has the characteristics of simple flow, easiness in operation, low input cost, high economic benefit and large-scale popularization and application.

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 invention provides a graphene-based hydrogen sulfide gas sensor and a preparation method thereof, and relates to the technical field of gas sensors. The preparation method of the graphene-based hydrogen sulfide gas sensor comprises the following steps: soaking the wood substrate in a mixed metal salt solution containing a water-soluble silver salt and a water-soluble transition metal salt; irradiating the soaked wood substrate by using a laser beam at room temperature under the condition of no shielding gas, so that lignin and cellulose in the wood substrate are cracked and reconstructed to form graphene; meanwhile, the mixed metal salt immersed in the wood substrate is decomposed to form bimetallic oxide nanoparticles including silver oxide nanoparticles and transition metal oxide nanoparticles, and the bimetallic oxide nanoparticles are dispersed on the surface of each layer of graphene to obtain a sensitive layer; and coating conductive materials on the wooden substrate and on the two sides of the sensitive layer to form a connecting electrode in contact with the sensitive layer, thereby obtaining the graphene-based hydrogen sulfide gas sensor.

The invention belongs to the technical field of adsorption materials, and particularly relates to a layered composite bimetallic oxide as well as a preparation method and application thereof. The preparation method of the layered composite bimetallic oxide provided by the invention comprises the following steps: mixing magnesium oxide and a hydrate of magnesium salt, and then carrying out ball milling to obtain a ball-milled material; mixing the ball-milled material with a hydrate of a manganese salt, and performing wet milling to obtain a composite bimetallic oxide precursor; roasting the composite bimetal oxide precursor to obtain a layered composite bimetal oxide; the molar ratio of the magnesium element in the magnesium oxide to the magnesium element in the magnesium salt is (1-6): 1. The preparation method provided by the invention is convenient and free of wastewater generation, and the prepared composite metal oxide shows excellent performance in synchronous remediation of cadmium-arsenic combined pollution, that is, the material can realize treatment of cadmium while remediation of arsenic pollution; an effective solution is provided for solving the problem that cadmium and arsenic pollution is difficult to treat at the same time at present.

The present application belongs to the field of new energy, and discloses a waste lithium ion battery crushing, sorting, and recycling method, comprising the following steps: step 1, crushing a lithium ion battery and heating, to obtain a first solid; step 2, removing a housing, to obtain a second solid; step 3, sieving the second solid, to obtain a first undersize product and a first oversize product; step 4, performing airflow sorting on the first oversize product to remove a separator, to obtain a third solid; step 5, pyrolyzing the first undersize product and the third solid, to obtain a fourth solid; step 6, sieving the fourth solid, to obtain a second undersize product and a second oversize product; and step 7, crushing and sieving the second oversize product, to obtain a third undersize product and a third oversize product. By means of collecting black powder before and after crushing in step 7, the present method implements black powder grading, thereby facilitating targeted treatment of black powder of different grades. The black powder recovery rate and the collection efficiency of the present application are high, and a separator is efficiently removed. Furthermore, the present application also discloses a system suitable for said method.

The present invention relates to the technical field of antibacterial materials, and in particular to an antibacterial material comprising black talc and manganese oxide, and a preparation method thereof. The antibacterial material comprising black talc and manganese oxide loaded on its surface, wherein the manganese oxide comprises Mn3O4 and MnOOH. The antibacterial material is obtained by loading manganese oxide on the surface of the black talc using potassium permanganate, urea, and hexadecyltrimethylammonium bromide as raw materials and employing a hydrothermal reaction in-situ synthesis method. The present invention utilizes the unique layered structure of black talc and synthesizes manganese oxide on the surface of the black talc using a liquid phase in-situ synthesis method. The crystal phase and morphology of the manganese oxide are controlled by adding black talc and regulating the synthesis temperature. This material not only improves the stability of the manganese oxide, reduces aggregation, and exhibits high antibacterial properties, but also enhances its biocompatibility, exhibits low cytotoxicity and low hemolytic properties, and is suitable for various biomedical applications.

The invention discloses a cathode material capable of spontaneously forming a spinel type lithium-rich metal oxide as well as a preparation method and application of the cathode material, and relates to the technical field of Li-O2 batteries. The cathode material for spontaneously forming the spinel type lithium-rich metal oxide is a transition metal oxide MO which is prepared by an electrostatic spinning method and exposes a specific crystal face; wherein M is Mn, Co, Ni or Fe. Aiming at the problems that Li2O2 with poor conductivity is generated in the current lithium-oxygen battery and the Li2O2 is difficult to decompose, the invention provides a cheap transition metal oxide MO which can avoid the formation of Li2O2 and promote the decomposition of Li2O2 at low potential and exposes a specific crystal face, and when the transition metal oxide MO is applied to the lithium-oxygen battery, the cycling stability and the energy efficiency can be enhanced, and the lithium-oxygen battery has a good application prospect. The electrochemical performance of the lithium-oxygen battery can be improved, the commercial cost can be reduced, and the material is more expected to become a key material for replacing noble metal in the positive electrode of the lithium-oxygen battery in the future.

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.

The invention discloses a method for preparing sphere-like battery grade manganous-manganic oxide, manganous-manganic oxide is directly obtained through a one-step method, and meanwhile, on-line changes of parameters of manganous-manganic oxide crystals in different growth stages are specifically controlled and changed according to growth characteristics of manganous-manganic oxide crystal particles. And the growth process of the manganous-manganic oxide crystal is regulated and controlled, so that the particle size of the product is controlled, the shape of the product is optimized, and finally the manganous-manganic oxide product with uniform and controllable particle size and good morphological characteristics is obtained. Besides, according to the invention, a corresponding scheme can be formulated according to the particle size of a target product to obtain a product meeting the requirement, and the fine control of the Mn3O4 preparation process is realized. The method has the advantages of short process, simplicity in operation, low energy consumption and the like.

The invention discloses a low-sulfur high-purity manganese tetraoxide and its preparation method and application, and relates to the technical field of positive electrode materials. The method comprises: mixing a high-sulfur manganese tetraoxide raw material with a sulfur content of ≥100ppm with a strong oxidant; oxidizing and heat-keeping the mixture at 350-600℃ air atmosphere for 3-8h to obtain a low-sulfur manganese oxide; treating at 250-550℃ for 2-4h under reducing gas conditions to obtain a low-sulfur high-purity manganese tetraoxide with a doped phase purity of 100% and a sulfur content of ≤50ppm. The present invention can achieve complete decomposition of sulfur residues during oxidation by oxidizing and then reducing the high-sulfur manganese tetraoxide raw material, thereby improving the treatment efficiency of sulfur residues. During the reduction process, other oxides of manganese are converted into Mn3O4, which is conducive to preventing the generated Mn3O4 from further reacting, and keeping the crystal form unchanged, and the obtained product has high purity, high tap density and good activity.

The invention discloses a lithium cobalt oxide positive electrode material as well as a preparation method and application thereof. The positive electrode material comprises a main body material as well as a metal oxide coating layer and a carbon layer which sequentially coat the main body material from inside to outside, the general chemical formula of the main body material is Li < x > Na < 1-x > CoO2; and the crystal phase of the main body material is an O2 phase. The positive electrode material can be used for preparing a lithium ion battery, and is prepared by the following steps: S1, mixing and sintering a sodium source and a cobalt source to obtain a P2-phase precursor; s2, preparing O2-phase lithium cobalt oxide from the P2-phase precursor and a lithium source; and S3, mixing the O2-phase lithium cobalt oxide with organic metal salt, and sintering at low temperature. According to the method, O2-phase lithium cobalt oxide is coated in a low-temperature sintering mode, compared with an existing coating mode, the coating effect is good, and coating elements cannot be diffused into the main body material.

The invention provides a deep eutectic solvent and a method for recovering metal elements in a decommissioned lithium battery. The deep eutectic solvent is obtained by mixing a hydrogen bond donor and a hydrogen bond acceptor and reacting; the temperature in the reaction process is 70-100 DEG C, and the molar ratio of the hydrogen bond donor to the hydrogen bond acceptor is 1: (2-10); wherein. The hydrogen bond donor comprises at least one of imidazole, 1, 2, 4-triazole and 1-ethyl-3-methylimidazole, and the hydrogen bond receptor comprises at least one of propylene glycol, glycerol, n-butyl alcohol and triethylene glycol. The deep eutectic solvent has high safety, and when the deep eutectic solvent is used for recycling the positive electrode material of the decommissioned lithium battery, the leaching rate of the lithium element and the recycling rate of the cobalt element or the manganese element can be effectively increased, and the deep eutectic solvent has high recycling purity.

The present invention discloses a potassium-sodium co-doped manganese dioxide nanomaterial and its preparation and application. The present invention comprises the steps of dissolving silicate and manganese salt and mixing them to prepare a precursor; and treating the precursor by alkali etching. The potassium ions and sodium ions pre-embedded between the manganese dioxide layers stabilize the layered structure of the crystal, widen the interlayer spacing, and make the embedding and extraction of zinc ions and hydrogen ions smoother through electrostatic shielding. At the same time, the prepared potassium-sodium co-doped manganese dioxide nanomaterial has a unique nano-flower sheet structure, which increases the contact area of ​​the reaction. The electrochemical test results show that the potassium-sodium co-doped manganese dioxide nanomaterial has a good reversible specific capacity as a positive electrode material for zinc ion batteries. At a current density of 0.5 A / g, the high specific capacity can reach up to 239.1 mAh / g after 600 cycles.

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.

The invention relates to a preparation method of a porous cauliflower-shaped MnO (at) C aqueous zinc ion battery positive electrode material. According to the method, low-cost and environment-friendly tartrate is adopted as a coordination agent and is coordinated with Mn < 2 + > to obtain manganese tartrate serving as a precursor, NaCl is adopted as a template and a reaction medium, the precursor and NaCl are fully mixed by a ball milling technology, and by regulating and controlling the calcination temperature, the manganese tartrate is prepared. The porous cauliflower-shaped MnO (at) C aqueous zinc ion battery positive electrode material assembled by the carbon-coated MnO nanoparticles is obtained. The preparation method successfully solves the problems that a coordination agent is toxic and harmful, MnO agglomerates at high temperature and carbon distribution is uneven, the maximum capacity of the obtained composite material is 561 mAh g <-1 > under the current density of 0.2 A g <-1 >, and the capacity still reaches 507 mAh g <-1 > after 100 cycles.

This invention belongs to the field of lithium-ion battery technology, specifically relating to a composite cathode material for lithium-ion batteries and its preparation method. The composite cathode material consists of three parts: a cathode matrix material, a lithium replenishment material, and a catalyst material. The preparation method is as follows: (1) preparing a composite material of the cathode matrix material and the lithium replenishment material in situ; (2) dispersing the catalyst material on the surface of the composite material and forming a stable interface layer between the catalyst material and the lithium replenishment material. Through the method of this invention: the lithium replenishment material has both surface modification of the cathode matrix material and lithium replenishment of the negative electrode, simultaneously improving the battery's initial efficiency and cycle stability; introducing the catalyst material onto the surface of the lithium replenishment material in situ fixes the free O generated by the Li release from the lithium replenishment material, alleviating the battery swelling phenomenon and further improving the battery's cycle stability and safety; moreover, the preparation process is simple, the raw materials are cheap and readily available, the production cost is low, and it is easy to promote industrial production.

The invention belongs to the field of nano materials, and particularly relates to a C and N co-doped three-dimensional manganese oxide nano material as well as a preparation method and application thereof. The invention relates to a preparation method of a C and N co-doped three-dimensional manganese oxide nano material, which comprises the following steps: (1) mixing urea and potassium chloride, adding water, grinding into paste, freeze-drying the mixture, calcining, and naturally cooling to room temperature to obtain a C and N co-doped precursor; (2) adding the precursor into a potassium permanganate solution, and carrying out heating and stirring reaction; and (3) after the reaction is finished, centrifuging by using water and absolute ethyl alcohol, cleaning, separating, collecting a product, and drying to obtain the C and N co-doped three-dimensional manganese oxide nano material. The C and N co-doped three-dimensional manganese oxide nano material is of a unique micron flower spherical structure assembled by three-dimensional nanosheets, and is uniform in size, good in dispersity and large in specific surface area. According to the nano material, the charge transfer performance and the PMS activation capability are improved, so that the nano material has more excellent catalytic activity.

Disclosed herein are acid-base leaching methods and systems. Specifically, the systems and methods can include reacting a feed material comprising at least two metals selected from the group consisting of iron, magnesium, and calcium with a weak acid to produce a first leachate comprising ions of the at least two metals and an insoluble product; reacting the first leachate with a base to produce a first solid product comprising a first metal and a second leachate comprising ions of a second metal different from the first metal; and reacting the second leachate with the base to produce a second solid product comprising the second metal and a third leachate.

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.

The invention relates to a process for the preparation of overlithiated transition metal oxides, for example Li2NiO2, from a mixture consisting of lithium peroxide and at least one transition metal oxide or a manganese-containing spinel compound in a two-stage calcination process with respect to temperature and atmospheric composition.

The disclosure relates to methods to prepare metal oxide nanoparticles (MONs) from the cathodes of lithium-ion batteries (LIBs), and related compositions and systems. The MONs can be used to improve the properties of drilling fluids, such as those used in underground drilling methods to produce oil and / or natural gas.

The application discloses a kind of potassium-doped chain-like trimanganese tetroxide positive electrode materials and its preparation method and application, belong to the field of aqueous zinc-ion battery, preparation method includes: configuration isopropanol and deionized water mixed solution with a portion of.In magnetic stirring, manganese acetate, potassium chloride and nitrilotriacetic acid are dissolved into mixed solution, K-Mn-NTA, i.e.K-Mn-NCs precursor is prepared by hydrothermal method;Afterwards, K-Mn3O4-NCs is prepared by annealing method;Finally, polyaniline is in-situ polymerized on K-Mn3O4-NCs to obtain K-Mn3O4-NCs@PANI;The positive electrode material of the application is applied to zinc-ion battery, can improve the cycle performance and rate capability of zinc-ion battery, improve the conductivity of positive electrode material while inhibiting the dissolution of Mn, improve the electrochemical performance of zinc-ion battery.

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.

Process for making a manganese composite (oxy)hydroxide with a mean particle diameter D50 in the range from 2 to 16 μm comprising the step(s) of combining (a) an aqueous solution containing salts of nickel and of manganese, and, optionally, at least one of Al, Mg, or transition metals other than nickel and manganese wherein at least 50 mole-% of the metal is manganese, (b) with an aqueous solution of an alkali metal hydroxide and (c) an organic acid or its alkali or ammonium salt wherein said organic acid bears at least two functional groups per molecule and at least one of the functional groups is a carboxylate group.

The invention provides a regeneration method and application of a nickel-cobalt-manganese ternary material precursor based on raw material recycling. The regeneration method comprises the following steps: crushing a nickel cobalt lithium manganate positive plate disassembled from a waste battery, and screening to obtain positive powder; calcining the positive electrode powder in a hydrogen atmosphere, and dissolving a calcined solid product in water to obtain a leachate and a solid mixture; mixing the solid mixture with dilute sulphuric acid, and reacting at a certain temperature to obtain leachate and hydrogen; adding ammonia water into the leachate to obtain a chelate, adjusting the pH value through sodium hydroxide to precipitate the chelate, and performing solid-liquid separation to obtain a precursor and a waste liquid; distilling the waste liquid to collect ammonia gas and water vapor; and (5) electrolyzing the residual liquid in the distillation in the step (5), collecting sodium hydroxide in a cathode chamber after electrolysis, and collecting dilute sulfuric acid in an anode chamber. The regeneration method not only has a high regeneration rate, but also can ensure the cyclic utilization of the raw materials, so that no medicine waste or waste water tail treatment process exists.

This application relates to the technical field of lithium battery material recycling, and specifically relates to a method for separating nickel and cobalt elements from anode products, which specifically includes the following steps: The crude manganese dioxide in the anode product is subjected to pickling treatment to obtain pickling slag. Then, the pickling slag is added with an ammonia leaching agent and a reducing agent for ammonia leaching treatment, and solid-liquid separation is carried out to obtain a manganese dioxide product; the ammonia leaching agent includes ammonium sulfate and ammonia water; wherein, the total ammonia concentration in the ammonia leaching agent is 80-230 g / L; the total ammonia concentration is the sum of the NH3 concentration and the NH4 + concentration. Through pickling treatment and ammonia leaching treatment, this application realizes the efficient separation of manganese dioxide and nickel and cobalt elements in the anode product, and obtains a manganese dioxide product with high purity and high yield.

The present application provides a surface-modified sodium electric precursor, and a preparation method therefor and the use thereof. The preparation method comprises the following steps: (1) injecting a mixed solution A, a precipitant solution and a complexing agent solution into a base solution in a cocurrent flow manner, and performing a one-step co-precipitation reaction; and (2) switching the mixed solution A into a mixed solution B, and continuing to perform a two-step co-precipitation reaction to obtain a surface-modified sodium electric precursor, wherein the mixed solution A comprises a main metal element and a doped metal element, and the mixed solution B comprises a coating metal element. In the present application, the coating modification of the surface of precursor particles is achieved by means of a heterogeneous precipitation method, such that the coating layer is more uniform and complete, and the thickness and the components are adjustable, which is beneficial to improving the stability and electrochemical performance of the material. The preparation method involved in the present application is simple and easy to implement, and is easy for industrial application.

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.

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.

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°).