442results about "Manganese oxides/hydroxides" patented technology

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

The invention discloses a preparation method and application for preparing a cobalt-doped manganese dioxide material by taking Co3 [Co (CN) 6] 2 as a hard template, and belongs to the technical field of electrode material preparation. The preparation method comprises the following steps: firstly, preparing a Co3 [Co (CN) 6] 2 type Prussian blue nano cubic material through a liquid phase coprecipitation reaction method; and then preparing the cobalt-doped manganese dioxide material with a loose porous structure by taking the Co3 [Co (CN) 6] 2 type Prussian blue nano cubic material as a hard template and potassium permanganate as a reaction raw material and adopting a hydrothermal synthesis method, specifically, forming a submicron cube with the size of 200-700nm by combining nanosheets with the thickness of about 10-20nm, and preparing the cobalt-doped manganese dioxide material with the loose porous structure by adopting a hydrothermal synthesis method. And an optimization strategy of Co atom doping of manganese dioxide and nanosheet morphology control is synchronously completed. When the material is used as an electrode material, the conductivity of the manganese dioxide electrode material is greatly improved, the capacity of an aqueous zinc ion battery is improved, and the material has excellent charge-discharge cycle stability.

The invention provides a ferromanganese oxide and a preparation method and application thereof, and belongs to the field of lithium ion battery, the preparation method of the ferromanganese oxide comprises the following steps: providing a ferromanganese solution, a complexing solution and a base solution, the pH value of the base solution being 11-12; mixing the ferromanganese solution, the complexing solution and the base solution, and carrying out first reaction treatment to obtain a first precursor; performing second reaction treatment on the first precursor to obtain ferromanganese oxide; wherein the ferromanganese solution comprises Fe < 2 + > and Mn < 2 + >; the complexing solution comprises a first complexing agent, and the ratio of the stability constant of a complex formed by the first complexing agent and Fe < 2 + > to the stability constant of a complex formed by the complexing agent and Mn < 2 + > is 103-105. According to the technical scheme, the manganese and iron co-precipitation effect can be improved, and therefore the product purity and other performance of the ferromanganese oxide are improved.

The invention provides a nitrogen-sulfur double-doped layered manganese dioxide material as well as a preparation method and application thereof, and relates to an electrochemical energy storage material. Thiourea is placed in a first temperature area, manganese dioxide is placed in a second temperature area (150-200 DEG C), the thiourea is decomposed into hydrogen sulfide and ammonia gas in the first temperature area, the hydrogen sulfide and the ammonia gas are carried by carrier gas to be conveyed into the second temperature area to be subjected to doping reaction with the manganese dioxide, and the nitrogen-sulfur double-doped layered manganese dioxide material is obtained. The manganese dioxide is delta-phase layered manganese dioxide. Nitrogen and sulfur elements are doped into manganese dioxide through a low-temperature roasting method, the intrinsic conductivity and structural stability of manganese dioxide are improved, the material has high reversible capacity, and the formation of part of oxygen vacancies can help the material expose active sites, so that the overall capacity of the material is improved. The nitrogen-sulfur double-doped layered manganese dioxide material is used as a positive electrode material for a zinc ion battery, and has excellent electrochemical performance.

The invention belongs to the technical field of new energy materials, and discloses a method for preparing special high-purity manganous-manganic oxide for high-end lithium manganate from manganese sulfate, which is characterized in that manganese sulfate is used as a raw material, seed crystals are prepared firstly and then subjected to oxidative synthesis to enable the seed crystals to grow slowly, any additive is not needed, complex procedures such as roasting, crushing and the like are removed, and the method is suitable for industrial production. The manganous-manganic oxide particles with different particle sizes can be prepared, the prepared manganous-manganic oxide product is high in sphericity degree, controllable in particle size distribution, high in tap density and low in specific surface area, and the process has the advantages of being high in automation degree, improving the physical and chemical properties of manganous-manganic oxide, reducing the impurity content in the product and the like.

The invention provides a Mn-based metal organic framework derived Mn2O3 / Mn3O4 heterojunction material as well as a preparation method and application thereof, and belongs to the field of nano material preparation methods and electro-catalysis cross application. The preparation method comprises the following steps: S10, reacting manganese salt, a surfactant and a benzoic acid compound in a solvent to obtain a Mn-based metal organic framework material; s20, calcining the Mn-based metal organic framework material in an inert atmosphere to obtain a carbonized product; and S30, flattening the carbonized product, and calcining the flattened carbonized product in an air atmosphere to obtain the Mn-based metal organic framework derived Mn2O3 / Mn3O4 heterojunction material. The method can be applied to renewable energy sources, is simple in process, universal in preparation condition, high in yield, green and environment-friendly, stable in product morphology and excellent in catalytic activity, shows excellent activity and electrochemical performance in catalysis of lithium polysulfide conversion of a cathode of a lithium-sulfur battery, and is also suitable for medium-scale industrial production.

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 relates to a method and a system for preparing a battery metal oxide precursor through nitrate spray pyrolysis. The method comprises the following steps: preparing a metal nitrate mixed solution; atomizing and spraying the metal nitrate mixed solution into a reaction furnace, and performing pyrolysis through different heating temperature zones in the reaction furnace to obtain a metal oxide mixture and high-temperature flue gas; the high-temperature flue gas is subjected to waste heat recovery treatment and then enters a regeneration device to be recovered, and regenerated nitric acid is obtained; the metal oxide mixture is subjected to secondary heating at the bottom of the reaction furnace. The metal oxide precursor is prepared through spray pyrolysis, and compared with a traditional coprecipitation calcination process, the method is more economical and lower in operation cost; and different heating temperature zones are adopted for pyrolysis, so that the application range is wider, and the device can be suitable for metal nitrate at different pyrolysis temperatures.

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 method for resource regeneration of denitration manganese slag, and belongs to the technical field of energy conservation and environmental protection. The method comprises the following steps: mixing the denitration manganese slag, a powdery additive and hydrogen peroxide, carrying out a first oxidation reaction, and carrying out solid-liquid separation to obtain filter residues; mixing the filter residue with an alkaline solution to obtain a mixture, introducing air into the mixture, carrying out a second oxidation reaction and solid-liquid separation to obtain a filtrate, and evaporating the filtrate to dryness to obtain a concentrated solid; the main component of the concentrated solid is K2MnO4; dissolving the concentrated solid in water, pressurizing, introducing mixed gas, and carrying out disproportionation reaction to obtain a Mn-containing mixture; the Mn-containing mixture comprises MnO2 (manganese dioxide) and KMnO4 (potassium manganese oxide). According to the method, the comprehensive utilization of the Mn element is realized through primary oxidation, secondary oxidation and valence state separation, and the purification of resource products is realized through a green process flow.

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 invention belongs to the technical field of lithium-ion batteries and relates to a method for preparing a surface-coated manganese dioxide negative electrode material. The present invention discloses a method for preparing a surface-coated manganese dioxide negative electrode material, wherein manganese sulfate and potassium permanganate are dissolved in deionized water, and then the entire solution is transferred into a polytetrafluoroethylene-lined autoclave, and subjected to a high-temperature hydrothermal reaction. The precipitate after the reaction is washed and dried to obtain a product MnO 2 , the prepared MnO 2 Re-disperse in deionized water and add copper acetate, (NH 4 ) 6 Mo 7 O 24 •4H 2 O; add folic acid ethanol solution to the above dispersion, stir at room temperature for several hours, separate and wash the precipitate, dry the precipitate and calcine it in an argon atmosphere in a tube furnace to obtain a coated manganese dioxide negative electrode material. The surface coating layer of the manganese dioxide negative electrode material of the present invention is molybdenum oxide, copper and nitrogen-doped carbon, and the three components in the coating layer enhance the electrochemical properties of the composite material through a synergistic effect.

The invention discloses a potassium-doped chain-shaped manganous-manganic oxide positive electrode material and a preparation method and application thereof, and belongs to the field of aqueous zinc ion batteries, and the preparation method comprises the following steps: preparing a mixed solution of isopropanol and deionized water; the preparation method comprises the following steps: under magnetic stirring, dissolving manganese acetate, potassium chloride and nitrilotriacetic acid into a mixed solution, and preparing K-Mn-NTA, namely a K-Mn-NCs precursor, through a hydrothermal method; then, K-Mn3O4-NCs is prepared through an annealing method; and finally, carrying out in-situ polymerization on polyaniline on the K-Mn3O4-NCs to obtain the K-Mn3O4-NCs coated PANI. When the positive electrode material is applied to the zinc ion battery, the cycle performance and the rate capability of the zinc ion battery can be improved, the conductivity of the positive electrode material is improved, the dissolution of Mn is inhibited, and the electrochemical performance of the zinc ion battery is improved.

The invention discloses a method for preparing a manganese sulfate crystal by using manganese carbonate ore. The preparation method of the manganese sulfate crystal comprises the following steps: leaching manganese carbonate ore by using sulfuric acid to obtain a leaching solution, precipitating the leaching solution by using a heavy removing agent to remove heavy metal ions, neutralizing redundant sulfuric acid in the leaching solution, introducing a precipitating agent, reacting with the precipitating agent to obtain a precipitate, washing the precipitate with water to remove impurities, and dissolving by using sulfuric acid to obtain the manganese sulfate crystal. And after dissolving, precipitating a small amount of residual calcium and magnesium ions by using fluoride, filtering to obtain fluorine-containing manganese sulfate filtrate, finally adding a fluorine removal agent for solid-liquid separation, and evaporating and crystallizing the filtrate to obtain manganese sulfate crystals. The manganese sulfate crystal is suitable for production of a lithium ion battery positive electrode material. According to the preparation method of the manganese sulfate crystal, the impurity removal cost is greatly reduced. The invention also discloses a method for preparing manganous-manganic oxide from manganese carbonate ore. The tap density of the manganous-manganic oxide is greater than 2.3 g / cm < 3 >, the specific surface area is less than 3m < 2 > / g, and the requirement of a battery-grade material is met.

The invention provides a positive electrode material, a preparation method thereof and a battery, the positive electrode material comprises an inner core and a shell coating the inner core, the inner core comprises a lithium-rich manganese-based positive electrode material, and the shell comprises manganese dioxide and aluminum fluoride; the chemical formula of the lithium-rich manganese-based positive electrode material is xLi2MnO3. (1-x) LiMO2, M is transition metal, the transition metal comprises at least one of Ni, Co and Mn, and x is more than or equal to 0 and less than or equal to 1. The positive electrode material is a modified lithium-rich manganese-based positive electrode material and has relatively good structural stability and relatively low charge transfer resistance, so that the rate capability and the cycling stability of the battery can be effectively improved.

The invention discloses a modified ruthenium-based acidic oxygen evolution catalyst as well as a preparation method and application thereof, and belongs to the technical field of nano materials and catalysis. The preparation method comprises the following steps: firstly, mixing a mixed solution of transition metal salt and soluble ruthenium salt with a complex ligand dispersion liquid, then evaporating and curing to obtain a metal chelate precursor, and finally performing pyrolysis oxidation to obtain the metal chelate. The transition metal salt comprises at least one of soluble Nb, Ti, Cr, Mn, Co, Cd, Sn and Sb metal salts. The preparation process is simple and easy to implement, the precursor salt is flexible to select, the synthesis method has high expansibility in preparation of the nano oxide, a preparation way is provided for application of the nano oxide in the fields of energy, environment, sensing and the like, and the prepared modified ruthenium-based acidic oxygen evolution catalyst is small and uniform in particle, clean in surface, free of ligands and suitable for industrial production. The catalyst shows high activity and high stability on oxygen evolution reaction, and a new choice is provided for a commercial anode catalyst for producing hydrogen by electrolyzing water.

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 invention relates to the technical field of high-performance composite materials, and provides a frequency band magnetic control adjustable one-dimensional nanotube composite wave-absorbing material and a preparation method thereof.The material is composed of a one-dimensional tubular ferroferric oxide matrix and manganous-manganic oxide wrapping the outer side of the matrix, and directional arrangement is conducted through magnetic control rotation. The preparation method comprises the following steps: preparing an iron oxyhydroxide precursor through a hydrothermal synthesis method; the preparation method comprises the following steps: reducing an iron oxyhydroxide precursor by a liquid-phase pyrolysis method, and coating a manganous-manganic oxide shell layer in situ at the same time, so as to obtain a nanotube ferroferric oxide / manganous-manganic oxide composite material; and carrying out orientation arrangement on the nanotube-shaped ferroferric oxide / manganous-manganic oxide composite material through magnetic field control. According to the preparation method and the structural design, the yield, the uniformity, the magnetic performance, the electromagnetic wave absorption efficiency, the multi-band electromagnetic loss enhancement and the like of the material are remarkably improved.

The invention discloses flaky spherical manganous-manganic oxide and a preparation method and application thereof.The manganous-manganic oxide serves as an adsorption material to be used in a wastewater purification and solution impurity removal process, and the preparation method of the manganous-manganic oxide comprises the steps that 1, a mixed salt solution containing a manganese element and an A element is prepared or taken; (2) taking a mixture of ammonia water and water as a reaction base solution, adding the mixed salt solution, the ammonia water and caustic soda liquid into the reaction base solution for reaction, continuously introducing air and keeping stirring to obtain reaction slurry; and (3) carrying out post-treatment on the reaction slurry to obtain the flaky spherical manganous-manganic oxide. The flaky spherical manganous-manganic oxide disclosed by the invention can realize refined adsorption of impurities, is not easy to fall off and high in adsorption rate, and has very high application value as an adsorption material; the preparation method is easy to industrialize and low in cost, and physical indexes of a final product can be controlled through parameter adjustment.

The invention discloses a method for synthesizing high-purity or battery-grade manganous-manganic oxide, and belongs to the technical field of chemical synthesis. The invention relates to a method for synthesizing high-purity or battery-grade manganous-manganic oxide. The method comprises the following steps: S1, preparing a manganese hydroxide slurry suspension by using high-purity manganese hydroxide as a raw material and pure water; s2, adding ammonium salt into the reaction device as a catalyst; s3, introducing hot air at 25-90 DEG C into the reaction device, and reacting to obtain solid manganous-manganic oxide; and S4, filtering and drying the solid manganous-manganic oxide to obtain a high-purity manganous-manganic oxide product, and recycling filtrate to prepare slurry.

The invention discloses preparation and application of amorphous manganese dioxide nanoparticles and a supercapacitor. The preparation method comprises the following steps: cooling a potassium permanganate aqueous solution to not more than 4 DEG C; adding ethanol into the cooled potassium permanganate aqueous solution, and stirring and reacting at the temperature of not more than 4 DEG C to obtain a first product; and centrifuging the first product to obtain a precipitate, and drying to obtain the amorphous manganese dioxide nano-particles. The amorphous manganese dioxide nanoparticles can be applied to an electrode active material, and the electrode active material can be further applied to a supercapacitor. The high-capacity asymmetric supercapacitor assembled by the amorphous MnO2 (12.6 mg.cm <-2 >) and the activated porous carbon (APC, 22.4 mg.cm <-2 >) has the ultrahigh surface energy density of 780.3 mu Wh.cm <-2 >. In addition, after 8000 times of circulation, the excellent circulation stability of 98% of initial capacitance retention rate is realized, and the requirements of commercial energy storage equipment are met.

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 invention relates to a preparation method and application of metal-doped calcium manganese ore manganese dioxide. The method comprises the following steps: dissolving manganese salt in deionized water to prepare a solution; under stirring, dropwise adding an alkali solution into the obtained solution, after a solid is separated out, adding metal salt and magnesium sulfate, uniformly mixing, then slowly adding an oxidizing agent, and stirring to obtain a black precipitate; washing the black precipitate with water, soaking the black precipitate in a magnesium chloride solution, washing again, transferring the obtained solid and magnesium chloride into a high-pressure kettle with a polytetrafluoroethylene lining, heating, cooling, centrifuging, washing and drying the obtained precipitate to obtain metal-doped calcium manganese ore manganese dioxide; the original tunnel structure of the calcium manganese ore manganese dioxide cannot be changed by doping the ions such as Zn < 2 + >, Co < 2 + >, Ni < 2 + >, Al < 3 + >, Fe < 3 + > and Eu < 3 + > into the calcium manganese ore manganese dioxide, the doped metal active ions can be combined with the calcium manganese ore manganese dioxide, the electrochemical performance of the material in the water-based zinc ion battery can be effectively improved, and the material has important significance on research of the water-based zinc ion battery.

The invention relates to a silicon-doped hydroxyapatite (at) MnO2 composite material and a preparation method and application thereof.The preparation method comprises the following steps that a permanganate solution is added into a silicon-doped hydroxyapatite suspension for a reaction, and the mass ratio of silicon-doped hydroxyapatite to permanganate is (5-8.75): (0.01-0.024); and after the reaction is finished, carrying out post-treatment to obtain the silicon-doped hydroxyapatite (at) MnO2 composite material. According to the preparation method, the permanganate solution is doped into the silicon-doped hydroxyapatite suspension for reaction, the permanganate solution can be decomposed and grow on the silicon-doped hydroxyapatite, a core-shell structure with the silicon-doped hydroxyapatite as a core and MnO2 as a shell is formed, and the obtained silicon-doped hydroxyapatite and MnO2 composite material is uniform in morphology, high in specific surface area and high in specific surface area. And a uniform shell layer is formed by controlling the dosage ratio of the permanganate to the silicon-doped hydroxyapatite, so that low cytotoxicity or even no cytotoxicity is ensured, and remarkable thermal response performance is achieved.

The invention discloses a supported catalyst for acidic oxygen evolution reaction as well as a preparation method and application of the supported catalyst. The supported catalyst comprises a MnO2 nanofiber carrier and noble metal and / or noble metal oxide loaded on the surface of the carrier. The preparation method of the supported catalyst comprises the following steps: (1) dispersing a manganese source, ammonium persulfate and potassium sulfate in a first solvent, and carrying out a heating reaction to obtain MnO2 nanofibers; and (2) uniformly mixing the MnO2 nanofibers with a noble metal source dispersion liquid and molten salt, drying to obtain mixed powder, and calcining the mixed powder in an inert atmosphere to obtain the supported catalyst. The supported catalyst prepared by the method shows high catalytic activity under the condition of low noble metal loading capacity, the preparation cost of the catalyst is reduced, and the catalyst shows good durability under the specific morphology of the manganese dioxide carrier and the interaction between the manganese dioxide carrier and noble metal.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a composite positive electrode material for a lithium ion battery and a preparation method of the composite positive electrode material. The composite positive electrode material is composed of a positive electrode base material, a lithium supplementing material and a catalytic material. The preparation method comprises the following steps: (1) preparing a composite material of the positive electrode base material and the lithium supplementing material in situ; and (2) dispersing the catalytic material on the surface of the composite material of the positive electrode base material and the lithium supplementing material, and forming a stable interface layer between the catalytic material and the lithium supplementing material. According to the method disclosed by the invention, the lithium supplementing material has double functions of surface modification of a positive electrode base material and lithium supplementing of a negative electrode, and meanwhile, the first effect and the cycling stability of the battery are improved; a catalytic material is introduced to the surface of the lithium supplementing material, free O generated by the lithium supplementing material Li is fixed in situ, the bag expansion phenomenon of the battery is relieved, and the cycling stability and safety of the battery are further improved; the preparation process is simple, raw materials are cheap and easy to obtain, the production cost is low, and industrial production and popularization are easy.

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.