1272 results about "Manganese oxide" patented technology

The invention discloses a nickel-containing etching wastewater treatment process, which belongs to the technical field of environmental protection, and comprises a raw water regulating tank, a pH pre-regulating tank, a heterogeneous catalytic oxidation tower, a neutralization coagulation tank, an inclined tube sedimentation tank and a clean water tank which are connected in sequence. According to the process, under the neutral condition, a catalyst loaded with cobalt manganese oxide is used for activating sodium hydrogen persulfate, high-activity sulfate free radicals are generated, a Ni-EDTA complex structure is fractured in a targeted mode, free nickel ions are released in situ, organic ligands are synchronously mineralized, and the adding amount of sodium hydrogen persulfate is dynamically adjusted through a clean water pool closed-loop control system; and high-purity nickel hydroxide precipitate is generated through alkaline precipitation and coagulation, so that efficient solid-liquid separation is realized. The treatment process disclosed by the invention is compact in flow and stable in operation, effectively solves the problems of difficult complex breaking, low nickel removal efficiency, high sludge toxicity, difficult resource recovery and the like when the EDTA complex nickel wastewater is treated by a traditional method, realizes closed-loop recovery of nickel resources, and has the remarkable advantages of low cost, high efficiency and environmental friendliness.

The invention relates to the technical field of batteries, and discloses a preparation method of a lithium nickel manganese oxide positive electrode active material, a battery monomer, a battery device and a power utilization device. The battery monomer comprises a positive pole piece, the positive pole piece comprises a positive pole film layer, the positive pole film layer comprises a lithium nickel manganese oxide positive pole active material, in an XRD diffraction pattern of the lithium nickel manganese oxide positive pole active material, the full width at half maximum of a characteristic diffraction peak of a (111) crystal face is 0.1-0.2 degree, the full width at half maximum of a characteristic diffraction peak of a (311) crystal face is 0.1-0.2 degree, and the full width at half maximum of a characteristic diffraction peak of a (311) crystal face is 0.1-0.2 degree. And (400) the full width at half maximum of the characteristic diffraction peak of the crystal face is 0.1-0.2 degree. According to the battery monomer provided by the embodiment of the invention, lattice defects of the positive electrode active material are few, capacity fading can be delayed in the cycle process, and the cycle performance of the lithium ion battery can be remarkably improved.

The invention relates to the technical field of gas sensors, and particularly discloses an electrochemical formaldehyde sensor electrode, a preparation method thereof and an electrochemical formaldehyde sensor. The electrochemical formaldehyde sensor comprises an electrochemical formaldehyde sensor electrode and a binary electrolyte, the electrochemical formaldehyde sensor electrode comprises a polytetrafluoroethylene film, the polytetrafluoroethylene film is coated with slurry for an electrochemical formaldehyde sensor electrode; and the slurry is formed by mixing nano manganese dioxide, platinum carbon and a Nafion solution. According to the electrochemical formaldehyde sensor, the electrode prepared from the slurry formed by mixing the nano manganese dioxide, the platinum carbon and the Nafion solution has relatively high catalytic activity, so that the sensor shows extremely high sensitivity and extremely good linearity on formaldehyde, and the electrochemical formaldehyde sensor has relatively high catalytic activity by regulating and controlling the proportion of the binary electrolyte. The electrochemical formaldehyde sensor has the advantages of high sensitivity, low cost, fast response, high detection precision and the like.

The invention discloses an electrolyte for an aqueous manganese-based battery. The electrolyte comprises an electrolyte, and the electrolyte comprises a manganese salt; the weak acid is used for regulating and controlling proton dynamic release of the positive electrode / electrolyte interface to realize on-demand supply of protons of the positive electrode / electrolyte interface; and a solvent, wherein the solvent is deionized water; the PH range of the electrolyte is 2.0-3.5, and the electrolyte can realize on-demand supply of protons of a positive electrode / electrolyte interface in the charging and discharging process of the aqueous manganese-based battery, and promotes efficient and reversible deposition and dissolution reaction of a positive active substance manganese dioxide. According to the invention, the proton on-demand supply electrolyte is constructed by utilizing dynamic dissociation equilibrium of weak acid, so that on-demand supply of protons in the MnO2 dissolving process is realized, complete electrochemical dissolution of MnO2 is promoted, and generation of'dead manganese 'is inhibited, so that the cycling stability of the battery and the utilization efficiency of active substances are remarkably improved. The invention also discloses an aqueous manganese-based battery for realizing on-demand supply of protons and application of the aqueous manganese-based battery in the field of secondary energy storage.

An electrode structure for a solid-state or semi-solid-state battery is provided in which NCM electrode particles coated with an interphase layer and a nitrogen-containing carbon layer are disposed. [Solution] The NCM electrode particles comprise NCM (nickel-cobalt-manganese oxide) particles (15), primary particles (30) that coat the outer surfaces of the NCM particles, an interphase layer (16) that includes a glass phase layer (241) and a plurality of ceramic particles (242), and a nitrogen-containing carbon layer (35) that coats the exterior of the primary particles. Nitrogen-doped carbon molecules in the nitrogen-containing carbon layer aid in the conduction of electrons and lithium ions, modifying the electrical potential of the NCM particles. The nitrogen-containing carbon layer is formed by coating the surfaces of the primary particles with a nitrogen-containing polymer material and calcining the material in an inert atmosphere. Conjugated bonds are formed between the carbon and nitrogen, modifying the energy band structure, reducing the energy required for electrons to transition to the conduction band, and improving overall electronic conductivity.

The embodiment of the invention provides a lithium nickel manganese oxide composite material and a preparation method thereof, a positive plate and a battery. The lithium nickel manganese oxide composite material comprises an inner core and a shell coating at least part of the surface of the inner core, the inner core comprises a lithium nickel manganese oxide material, and the shell comprises a spinel phase oxide. According to the invention, the coating layer comprising the spinel phase oxide is formed on the surface of the lithium nickel manganese oxide, so that a stable ion transmission interface is obtained, and the obtained lithium nickel manganese oxide composite material has structural stability and high rate performance under high voltage.

The present application belongs to the technical field of gaseous arsenic adsorption, and particularly relates to a sulfur-tolerant gaseous arsenic adsorption material, a preparation method and application thereof. Manganese oxide and an iron source are mixed and placed in a ball mill jar, then the ball mill jar is sealed, argon is filled into the jar, and the iron-modified manganese oxide adsorption material is obtained by ball milling. The addition of iron improves the sulfur tolerance of manganese oxide, so that the adsorbent still has high gaseous arsenic adsorption capacity under high-concentration SO2 conditions, and is suitable for the removal of gaseous arsenic in typical high-SO2 flue gas, i.e. non-ferrous smelting flue gas. The preparation method is simple, the cost is low, the gaseous arsenic adsorption capacity is large, and the present application has a wide application prospect.

The application provides a lithium ion battery and an electric device, the lithium ion battery comprising a positive electrode sheet and an electrolyte, an active substance in the positive electrode sheet comprising a phosphate lithium positive electrode material and a lithium nickel cobalt manganese oxide, the electrolyte comprising a positive electrode film former, a negative electrode film former and a lithium salt, the lithium salt comprising lithium hexafluorophosphate and a lithium bisfluorosulfonylimide salt, the lithium ion battery satisfying the following formula: wherein NL is a mass ratio of the lithium nickel cobalt manganese oxide and the phosphate lithium positive electrode material, S alt is a value of a molar concentration of the lithium hexafluorophosphate and the lithium bisfluorosulfonylimide salt in the electrolyte in mol / L, and A dd is a mass ratio of the positive electrode film former and the negative electrode film former. The application can adjust the ratio of the positive electrode film former and the negative electrode film former and the ratio of the high-heat-resistance lithium salt according to the mixing ratio of the ternary material doped in the lithium manganese iron phosphate or the lithium iron phosphate, so that the cycle performance of the battery is improved.

The invention belongs to the technical field of zirconite porous ceramics, and discloses a method for preparing high-strength zirconite porous ceramics by a foaming injection-coagulation method, which is characterized in that zirconite powder, yttrium oxide powder and manganese oxide powder are used as raw materials, and the foaming injection-coagulation method is adopted to prepare the zirconite porous ceramics. The zirconite porous ceramic is obtained through the steps of syrup solution preparation, ceramic powder premixing, ceramic slurry preparation, injection molding gelling, sintering treatment and the like. The foaming gel casting method is adopted, so that the porosity of the zirconite porous ceramic can be effectively increased, and the heat radiation transmission efficiency is reduced; saccharide is used as a solution medium instead of water, so that the sintering surface is increased and the strength of the porous ceramic is improved; the manganese oxide and the yttrium oxide are added, so that the merging and growing process among zirconite crystal grains is accelerated, the crystal form of zirconium oxide is stabilized at high temperature, cracks caused by crystal form transformation are avoided, the strength of the zirconite porous ceramic is further improved, and the prepared zirconite porous ceramic is stable in high-temperature performance, high in strength and low in heat conductivity coefficient.

The invention discloses porous chlorine dioxide slow-release preservative paper and a preparation method thereof.The porous chlorine dioxide slow-release preservative paper comprises a paper base, a porous carrier is fixed to the paper base through oxidized starch glue, and sodium chlorite, an activating agent and a stabilizing agent are loaded on the porous carrier; the porous carrier is one of aluminum oxide, titanium oxide, cobalt oxide, zinc oxide, copper oxide, iron oxide, cerium oxide, zirconium oxide, nickel oxide, manganese oxide, praseodymium oxide and lanthanum oxide with a porous structure. The slow release of chlorine dioxide can be stably and effectively realized, the release period of chlorine dioxide is prolonged, and long-acting stable sterilization and disinfection effects are realized.

The invention discloses a preparation method of a high-specific-power manganese dioxide-carbon fluoride battery positive pole piece. The preparation method comprises the following steps: (1) carrying out high-temperature heat treatment on electrolytic manganese dioxide to finish crystal transformation of the electrolytic manganese dioxide; (2) carrying out ball milling on the manganese dioxide, the carbon fluoride and the conductive agent which are subjected to heat treatment to obtain a composite substance of the manganese dioxide, the carbon fluoride and the conductive agent; (3) stirring and mixing the composite substance with a binder, a surfactant and deionized water to form manganese dioxide-carbon fluoride battery positive electrode slurry; and (4) coating the prepared positive electrode slurry on an aluminum mesh with a certain surface density in an extrusion or roller coating manner, and carrying out drying and rolling processes to obtain the high-loading-amount manganese dioxide-carbon fluoride battery positive electrode plate with a certain compaction density and surface density. The prepared positive pole piece has relatively high conductivity and energy density, and the high-magnification application scene of the lithium manganese dioxide-carbon fluoride battery is further widened.

The invention relates to the technical field of batteries, in particular to a positive pole piece and a preparation method and application thereof. The positive pole piece comprises a positive current collector; the first positive electrode coating is arranged on the surface of at least one side of the positive electrode current collector, the first positive electrode coating comprises a first active material, and the first active material comprises one or more of lithium iron phosphate, titanium-doped lithium iron phosphate, manganese-doped lithium iron phosphate and magnesium-doped lithium iron phosphate; the second positive electrode coating is arranged on the surface, far away from the positive electrode current collector, of the first positive electrode coating, the second positive electrode coating comprises a second active material, and the second active material comprises nickel cobalt lithium manganate; the solid electrolyte layer is arranged on the surface, far away from the first positive electrode coating, of the second positive electrode coating, and the solid electrolyte layer comprises titanium niobate. The positive pole piece provided by the invention not only has relatively high gram capacity, but also can improve the energy density of the battery, meanwhile, ensures good safety performance, and has a good commercial application prospect.

The invention discloses an electrolytic medium, an acidic oxygen evolution non-noble metal manganese-based catalyst, a process and application, and belongs to the field of water electrolysis hydrogen production. The preparation process comprises the following steps: (1) dissolving a metal salt of M, a metal salt of Mn, sodium sulfate, sulfuric acid and sodium acetate in deionized water to serve as an electrolyte; (2) carrying out electrodeposition reaction by using an electrochemical workstation and a three-electrode system at room temperature, and loading a manganese-based component on a conductive carrier; (3) cleaning the conductive carrier loaded with the manganese-based component in deionized water, and drying; calcining the loaded manganese-based component in the air at the temperature of 300-500 DEG C; the molar ratio of M to Mn is smaller than 1: 5, the metal manganese-based catalyst is metal element doped manganese oxide M-MnOx, and when the molar ratio is larger than or equal to 1: 5, the metal manganese-based catalyst is metal oxide coupled manganese oxide MOx / MnOx. According to the scheme, the problem that the activity and the stability of the existing MnO2 which is directly used as an excellent acidic oxygen evolution catalyst are insufficient is solved.

The invention provides a lithium nickel manganese oxide positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment, and relates to the field of lithium ion batteries. Comprising an inner core and a coating layer, the chemical general formula of the inner core is Li Ni < x > Mn < y > M < z > M'wO < 4 >; m comprises one or more of Al, Mg, Co, Mn, Ni, Ti, Zr, W, Nb, P, Sb, F, Sr and Se; m'comprises one or more of Mg, Co, Mn, Ni, Ti, Zr, W, Nb, P, Sb, F, Sr and Se; the coating layer comprises a LiM ''O-type fast ion conductor, and M'' comprises one or more of Mg, Al, Co, Mn, Ni, Ti, Zr, W, Nb, Sb, La and Se. According to the lithium nickel manganese oxide positive electrode material, M and M'are cooperatively doped, and then fast ion conductor coating is performed, so that the ion conductivity of the positive electrode material and the structural stability of the material under high voltage are remarkably improved.

The invention discloses a high-voltage lithium nickel manganese oxide positive electrode material and a preparation method thereof, a battery positive electrode and a battery, and belongs to the technical field of lithium ion battery materials. Comprising an inner core composed of a lithium-containing compound, the inner core is coated with a shell composed of tungstate, and a transition layer is arranged between the inner core and the shell. The tungstate has good chemical and thermodynamic stability, can prevent erosion of HF in the electrolyte, inhibit dissolution of transition metal, reduce the shuttle effect, and can greatly improve the capacity retention rate of the battery. The preparation method is simple in process steps and convenient for large-scale preparation. Meanwhile, the cathode material coated with magnesium tungstate, calcium tungstate or bismuth tungstate has good dynamic performance, the capacity and the rate capability are remarkably improved, meanwhile, the stability of the material is also remarkably improved, and a good application way is provided for application of the high-voltage type lithium nickel manganese oxide cathode.

The invention belongs to the technical field of preparation of sodium ion battery electrode materials, and provides a high-performance sodium storage material based on Zn-doped modified P2 type sodium nickel manganese oxide, a preparation method and a battery. The invention aims to solve the problems of rapid capacity attenuation under high voltage, obvious volume change in the phase change process, irreversible capacity loss and the like of the existing P2 type sodium nickel manganese oxide material. According to the main technical scheme, through low-concentration Zn doping, the structural stability of the material is optimized, and the electrochemical performance of the material is improved on the premise that voltage, capacity and energy density are not sacrificed. The preparation method comprises the following steps: dissolving a sodium source, a manganese source, a nickel source and a zinc source, adding a complexing agent for reaction, evaporating the solvent to dryness, and performing two-stage calcination to finally obtain the zinc-doped sodium-nickel-manganese oxide with the P2 type layered structure. The material can be used for high-safety sodium ion battery positive electrodes and is widely applied to the fields of energy storage power stations, low-speed electric vehicles and the like.

The invention discloses a manganese-enriched albumin boron-containing nano preparation as well as a preparation method and application thereof, and belongs to the field of medicines and nano biological materials. According to the manganese-enriched albumin boron-containing nano preparation, albumin serves as a core carrier, phenylboronic acid derivatives are loaded through covalent or electrostatic interaction, then a manganese oxide layer is deposited on the surface in situ, and the prepared manganese-enriched albumin boron-containing nano preparation can remarkably increase the boron accumulation amount in tumor tissue; local and systemic immune response of tumors is promoted through the immune activation effect of manganese ions, so that the treatment effect of boron neutron capture therapy (BNCT) is remarkably improved. According to the invention, a phenylboronic acid derivative with tumor targeting is compounded with albumin, and manganese oxide is deposited in situ on the surface of the phenylboronic acid derivative, so that a multifunctional nano preparation with high boron delivery efficiency, immunological enhancement and magnetic resonance imaging functions is formed.

The invention relates to a PEM ternary alloy catalyst for water electrolysis hydrogen production and a preparation method thereof, and belongs to the technical field of water electrolysis catalysts. 1-butyl-3-methylimidazolium tetrafluoroborate is introduced in the generation of a carrier manganese dioxide to increase the specific surface area of the carrier, fluorine doping and oxygen vacancy construction are realized on the surface of the carrier through hydrofluoric acid treatment, and then a metal precursor is dispersed through an ethylene glycol / water system; and finally, loading and alloying of the alloy nanoparticles are completed through hydrothermal reduction and heat treatment. The morphology and electronic structure of the carrier are synergistically regulated and controlled through ionic liquid and fluorine doping, the specific surface area and active sites are remarkably increased, strong interaction of metal and the carrier is achieved through ternary alloy component optimization, and the oxygen evolution reaction activity and stability of the catalyst and the precious metal utilization rate are effectively improved.

This invention provides a titanium-layer-constructed, synergistic low-eutectic salt regenerated waste lithium nickel cobalt manganese oxide cathode material. The preparation method includes the following steps: cutting the electrode sheet and placing it in an N-methylpyrrolidone solution, ultrasonically dissolving, filtering, washing, drying, and sieving to obtain the waste lithium nickel cobalt manganese oxide material; mixing the obtained waste lithium nickel cobalt manganese oxide cathode material with a titanium source, then adding a lithium source and mixing evenly to obtain a composite material; sintering the composite material in a two-stage process under an oxidizing atmosphere, cooling to room temperature, to obtain the regenerated waste lithium nickel cobalt manganese oxide cathode material with lithium replenishment and repair. The resulting material has a core-shell coated structure, with a lithium metatitanate layer as the coating layer and a titanium-doped lithium nickel cobalt manganese oxide core. The regenerated material exhibits uniform doping and coating, excellent rate performance, and significantly improved charge / discharge capacity and cycle stability.

The invention belongs to the technical field of air power supplies, and relates to modification treatment of an oxide, in particular to a cerium oxide doped transition metal oxide and a preparation method thereof, an air cathode and an air power supply. The preparation method comprises the following steps: dissolving cerium salt, cobalt salt and manganese salt in water, uniformly mixing to obtain a mixed solution, adjusting the pH value of the mixed solution to 9-11, and carrying out a sedimentation reaction to obtain a sediment; and drying the precipitate, and calcining in an air atmosphere at 300 + / -10 DEG C for 2-4 hours to obtain the cerium oxide doped transition metal oxide. The cerium oxide doped transition metal oxide is cerium doped cobalt manganese oxide with a spinel structure, and the doping amount of cerium is 20 + / -1wt%. The cerium oxide doped transition metal oxide provided by the invention is applied to an air cathode as a catalyst, and has good stability and high catalytic activity. The performance of an air power supply containing the oxide is remarkably improved. The method for preparing the oxide provided by the invention is simple and easy to operate, and is suitable for large-scale production.

The invention discloses a preparation method for recycling and regenerating a Mo / F co-doped manganese-sodium-rich electric ternary positive electrode material from a waste nickel cobalt lithium manganate positive electrode, and relates to a method for synthesizing and regenerating a Mo / F co-doped layered nickel cobalt manganese oxide manganese-rich (Na < 0.67 > Ni < 0.21 > Co < 0.1 > Mn < 0.67 > Mo < x > F < y > O < 2 >) ternary positive electrode material by recycling and reusing a waste power battery and application of the Mo / F co-doped manganese-sodium-rich electric ternary positive electrode material. The method comprises the following steps: leaching a waste ternary positive electrode material by a wet method, co-precipitating, calcining and regenerating to prepare the Mo / F co-doped sodium ion layered transition metal oxide positive electrode material (Na < 0.67 > Ni < 0.21 > Co < 0.1 > Mn < 0.67 > Mo < x > F < y > O < 2 >). An electrochemical test result shows that the positive electrode has excellent normal-temperature performance, and meanwhile, the problem of slow dynamics of the positive electrode at low temperature is broken through. According to the invention, the waste power battery positive electrode is recycled, and is regenerated and converted into the sodium ion battery positive electrode material with abundant raw materials through a modification strategy. A spinel surface layer is formed by introducing Mo / F, and the cycle performance of the layered transition metal oxide positive electrode material of the regenerated sodium-ion battery is improved through the synergistic effect of Mo / F. The preparation process is simple, high in operability, wide in raw material source, low in cost and suitable for large-scale production, and meets environmental requirements.

The invention discloses a water pollutant adsorbent. The water pollutant adsorbent is characterized by comprising a chelate prepared by reacting manganese dioxide with an EDTA-2Na (Ethylene Diamine Tetraacetic Acid-2Na) solution. The invention also discloses a preparation method and a production system of the water pollutant adsorbent. The preparation method of the water pollutant adsorbent comprises the following steps: 1, crushing and grinding electrolytic manganese anode mud; 2, removing impurities in the electrolytic manganese anode slime to obtain filter residues; 3, cleaning the filter residues, and carrying out solid-liquid separation to obtain an intermediate product; and 4, chelating modification. The water pollutant adsorbent production system comprises a reaction kettle. According to the technical scheme, the manganese dioxide raw material can be effectively utilized to prepare the pollutant adsorption and treatment material, and high-valued treatment of the electrolytic manganese anode mud solid waste is effectively achieved.

The invention provides a preparation method of an acoustic / photosensitizer-manganese dioxide nanoparticle and a product thereof. According to the method, firstly, a potassium permanganate reduction method is adopted to precisely synthesize the high-purity MnO2 nano-substrate, and according to the method, the size uniformity and dispersion stability of nano-particles can be precisely controlled by regulating and controlling the pH value and temperature of a reaction system and the concentration of a reducing agent. On the basis, amphiphilic high-molecular polyethylene glycol-polycaprolactone (PEG-PCL) is modified on the surface of the MnO2 nanometre. The whole preparation process is green and mild, and complex equipment is not needed; the reaction conditions are mild, nanoparticles are uniform, and the acoustic / photosensitizer can be combined and applied to an imaging technology to realize real-time monitoring.

The invention discloses a preparation method and application of an iron-manganese modified biochar material for remediation of cadmium and arsenic contaminated soil, and relates to the field of new materials.According to the material, rice hull biochar serves as a carrier, and the specific surface area and surface active sites are increased through programmed intermittent ball milling; and the Fe-O / Mn-O bonding modification complex is formed through gradient loading of iron and manganese oxides. The maximum adsorption capacity of the material to Cd < 2 + > and As (V) reaches 71.54 mg.g <-1 > and 49.30 mg.g <-1 > and is 1.65 / 2.53 times that of original biochar, the content of available Cd and As in soil is reduced by 8.98% and 25.2% under the condition that the addition amount is 0.4%, and the passivation efficiency is improved by 1.05 times (Cd) and 9.08 times (As) compared with that of non-ball-milled iron-manganese modified biochar; the material prepared by the method is applied to cadmium and arsenic polluted soil, pollution can be controlled by waste, and the soil can be effectively repaired.

A copper diffusion-suppressing electrical bond between a first semiconductor wafer or chip or interposer and a second semiconductor wafer or chip or interposer includes a first bond pad metal with a first bond pad metal surface disposed on the first semiconductor wafer or chip or interposer, bonded with a second bond pad metal with a second bond pad metal surface disposed on the second semiconductor wafer or chip or interposer. A copper outdiffusion-suppressing coating such as a titanium, cobalt, nickel / gold, or nickel / palladium / gold layer may be disposed on the first copper bond pad metal surface and / or on the second copper bond pad metal surface. The copper of the bond pad metal may be doped with manganese to form a copper outdiffusion-suppressing surface manganese oxide. The bond pad metal may alternatively be tungsten to prevent copper outdiffusion.

The invention provides a laterite-nickel ore leaching solution catalytic oxidation-fractional precipitation method, and relates to the field of hydrometallurgy, the method comprises the following steps: adding a catalytic oxidant and a first neutralizer into a laterite-nickel ore leaching solution to obtain a first filtrate and iron slag; adding a catalytic oxidant, a second neutralizer and a first coalescing agent into the first filtrate to obtain a second filtrate and a second precipitate; adding a third neutralizer and a first reducing agent into the second filtrate to obtain a nickel-cobalt precipitate and a third filtrate; adding a fourth neutralizer and a second reducing agent into the third filtrate to obtain a fourth precipitate and a fourth filtrate; mixing the second precipitate with a third reducing agent, performing reduction leaching, and adding a second coalescing agent and a fifth neutralizing agent to obtain a silicon-aluminum precipitate and manganese-scandium filtrate; the manganese-scandium filtrate is extracted, and manganese enters raffinate; and adding a catalytic oxidant and a sixth neutralizer into the raffinate to obtain the manganese oxide. Elements are recycled step by step, and the method has the advantages of multiple types of recycled elements, less resource waste and the like.

The invention discloses a sodium metavanadate-based catalyst activity gradient regulation and regeneration system and method, and relates to the technical field of industrial catalyst regeneration, the sodium metavanadate-based catalyst is of a unique layered structure, the sodium metavanadate-based catalyst comprises an outer layer, a middle layer and an inner layer from the surface to the interior in sequence, and active components and doping elements of all the layers are different; the outer layer is doped with high-content sodium metavanadate and manganese oxide, reactant molecules can be quickly adsorbed and activated in the initial stage of the reaction, the manganese oxide can provide additional active sites, reduce reaction activation energy and promote quick start of the reaction, and the middle layer is doped with a proper amount of sodium metavanadate and cerium oxide, so that the reaction is more stable in the process of the reaction. The cerium oxide can adjust migration and conversion of oxygen species on the surface of the catalyst, optimize the reaction path, improve the selectivity of a target product and reduce side reactions, the inner layer is doped with the low-content sodium metavanadate and tungsten oxide, and the structural stability of the catalyst under high-temperature and long-time reaction is maintained by means of the high stability of the tungsten oxide.

The invention belongs to the technical field of batteries, and particularly relates to a lithium nickel manganese oxide positive electrode material and a preparation method thereof, a positive plate, a lithium ion battery and a power utilization device. The lithium nickel manganese oxide positive electrode material meets the following conditions: 0.28 < = VO1 = I400 / (I111 + I311) < = 0.32, and 4.90 < = VO2 = I400 / I222 < = 5.50. The positive electrode material has low oxygen vacancy concentration and high crystal structure stability, and when the positive electrode material is applied to a lithium ion battery, the lithium ion battery has excellent high-temperature cycle performance, high-temperature storage performance and low-temperature discharge performance.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to lithium battery positive electrode slurry and a preparation method thereof.The slurry is composed of a lithium-manganese-rich layered oxide positive electrode material, a conductive agent, a water-based binder, deionized water and a functional additive lithium difluorophosphate. The stability of the slurry in the preparation and coating process is ensured, and meanwhile, the electrochemical performance of a pole piece in the later period is also improved. The preparation method comprises the following steps: adding a water-based binder into deionized water to form a binder glue solution; adding the lithium-rich manganese oxide positive electrode material, conductive carbon black SuperP and lithium difluorophosphate into the binder glue solution to prepare slurry; uniformly stirring the slurry by using a defoaming stirrer, and adding a solvent to adjust the concentration of the slurry. A stable interface layer can be formed on the surface of an active substance, so that the battery internal resistance is improved, the rate capability is improved, the cycle life is prolonged, the long-term stability of the battery can be remarkably enhanced, and the method is suitable for large-scale industrial application of the lithium ion battery.

The invention provides a positive plate, a battery and electronic equipment. The positive plate comprises a positive current collector and a positive active layer positioned on at least one surface of the positive current collector; the positive electrode active layer comprises a first positive electrode active layer and a second positive electrode active layer which are sequentially stacked in a direction far away from the positive electrode current collector; the first positive electrode active layer comprises a first positive electrode active material, and the first positive electrode active material comprises lithium manganese iron phosphate and a lithium oxide compound; the second positive electrode active layer comprises a second positive electrode active material, and the second positive electrode active material comprises a lithium oxide compound and nickel cobalt lithium manganate. When the positive plate is applied to the battery, the battery is not easy to generate gas during high-temperature storage, so that the safety performance of the battery is improved.