791results about "Manganese compounds" patented technology

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 relates to the technical field of resource recycling of manganese-containing wastewater, in particular to a process for preparing industrial-grade manganese carbonate by using a recycled manganese chloride solution, which adopts a two-stage purification and impurity removal strategy, performs primary purification and impurity removal by using sodium sulfide and sodium fluoride, and performs secondary impurity removal by using iminodiacetic acid grafted chelating resin. According to the invention, the problems of poor adaptability and incomplete impurity removal of the manganese chloride solution in the prior art are solved, the purity of the product is obviously improved so as to meet the requirements of the industrial grade manganese carbonate, and the process flow is simple.

The invention provides a single-crystal cobalt-free lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a cobalt-free lithium-rich manganese-based precursor material, a lithium source and a grain boundary separation auxiliary agent to obtain a mixed material; the mixed material is subjected to two-stage sintering, the two-stage sintering comprises first sintering and second sintering in sequence, and the single-crystal cobalt-free lithium-rich manganese-based positive electrode material is obtained, wherein primary crystal grains of the cobalt-free lithium-rich manganese-based precursor material are of a sheet structure. According to the invention, the cobalt-free lithium-rich manganese-based precursor material of which the primary crystal grains are of a sheet structure is taken as a raw material, and under the action of the grain boundary separation auxiliary agent, a two-stage sintering process is cooperatively matched, so that the single-crystal cobalt-free lithium-rich manganese-based positive electrode material which is uniform in grain size, high in dispersity, complete in crystal grains and continuous in interface is obtained, and the cobalt-free lithium-rich manganese-based positive electrode material is not only suitable for a liquid lithium ion battery, but also suitable for a lithium ion battery. The material is more suitable for a solid-state lithium ion battery, and the electrochemical performance of the battery is effectively improved.

Disclosed are positive electrode active materials for a rechargeable battery, positive electrodes including the positive electrode active materials, and rechargeable lithium batteries including the positive electrode active materials. The positive electrode active material comprises first particles comprising a compound having an olivine structure, second particles comprising a compound having a spinel structure, and third particles comprising a compound having a layered structure. The first particles and the second particles constitute a main active material, and the amount of the main active material is about 80 parts by weight to about 90 parts by weight based on 100 parts by weight of the positive electrode active material.

The invention discloses a single-crystal lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The preparation method of the single-crystal lithium-rich manganese-based material comprises the following steps: synthesizing a nickel-cobalt-manganese hydroxide as a precursor by using a coprecipitation method, then fully mixing the precursor with a lithium source, and then preparing the single-crystal lithium-rich manganese-based positive electrode material by adopting a stepped sintering schedule in combination with a high-temperature-section short-time low-oxygen-partial-pressure mixed atmosphere. According to the method, a stepped sintering schedule is adopted, the conditions such as the temperature, the heating and cooling rate and the atmosphere during sintering are reasonably regulated and controlled, the stepped sintering schedule is beneficial to optimizing the processes such as crystal crystallization, crystal growth and crystal defect repair, the short-time low-oxygen-partial-pressure mixed atmosphere in the high-temperature section is beneficial to achieving better crystal domain dispersion, the staggered structure of the Li2MnO3 phase is improved, and the performance of the lithium ion battery is improved. And finally, the micron-sized single-crystal lithium-rich manganese-based positive electrode material with good grain size consistency is obtained.

The invention provides a lithium-rich disordered rock salt positive electrode material as well as a preparation method and application thereof. The chemical general formula of the lithium-rich disordered rock salt positive electrode material is Li (1 + x) MpNqO (2-y) Xy, 0.3 < = x < = 0.6, p + q = 1, 0.5 < = p < = 0.9, 0.1 < = q < = 0.5, 0 < = y < = 0.4, and M comprises Fe and / or Mn; n comprises any one or a combination of at least two of Zr, Ti, Nb, Mo, W or V; x comprises a polyanionic group. The N element with higher valence is introduced into the lithium-rich disordered rock salt positive electrode material, and meanwhile, the polyanion group is introduced to jointly stabilize the crystal structure, so that the oxygen loss under high voltage is effectively inhibited, and the N element with higher valence can also reduce cation mixing and participate and stabilize the anion redox reaction, so that the lithium-rich disordered rock salt positive electrode material is more stable. The polyanion groups and the transition metal ions form strong covalent bonds, so that the cycling stability of the material is remarkably improved.

The application discloses a treatment method of a manganese-copper mixed solution, comprising the following steps: step (S1): adjusting the pH value of the manganese-copper mixed solution to 6.5-7, and obtaining a solution defined as a first solution; step (S2): adding an oxidizing agent to the first solution, and obtaining a solution defined as a second solution, wherein the oxidizing agent is oxidized with Mn 2+ to generate MnO2 in the range of the pH value of 6.5-7; and step (S3): collecting a first precipitate. The method has the advantages that the manganese ion can be separated in a short time, high-purity manganese ions can be recovered, the treatment method of waste liquid after recovery is simple, and the environment is less polluted.

The invention relates to an immune sensitization IRE treatment platform based on NK cell membrane coated manganese carbonate. A manganese carbonate composite nano material is formed by coating the surfaces of manganese carbonate nano particles with cell membranes. According to the invention, higher tumor specificity enrichment is realized, non-target tissue accumulation and systemic toxicity risks are reduced, collaborative integration of tumor targeted delivery, immune activation and IRE ablation is realized, and compared with single IRE, anti-tumor immune response is significantly enhanced.

To provide electrochemical cells improved in performance.SOLUTION: A composition is arranged for forming an electrode. The composition comprises an active material characterized by disordered rock salt crystallographic structure, and represented by the chemical formula (i). (In the formula, 1.2<x≤1.75, 0≤y<0.55, 0.1<z<1, 0≤a<0.5, 0≤b<1 and 0≤c<0.8, and M, N and P independently represent one or more kinds of Ti, Ta, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Al, Zr, Y, Mo, Ru, Rh and Sb.)SELECTED DRAWING: Figure 3

The invention discloses a method for recovering manganese from manganese-iron alloy waste residues, which comprises the following steps: crushing the manganese-iron alloy waste residues, drying, uniformly mixing the dried manganese-iron alloy waste residues with a binary flux according to a mass ratio of 1: (1.8-2), completely roasting, cooling to room temperature, and taking out a roasted slag sample, thereby obtaining the manganese from the manganese-iron alloy waste residues. Adding deionized water to leach manganese sulfate at room temperature, filtering and separating to obtain a manganese sulfate crude solution; and adding metal manganese powder, ammonium sulfide and a flocculating agent into the manganese sulfate crude liquid, further removing impurities, adjusting the pH value, adding citric acid, and filtering and separating to obtain a manganese sulfate purified liquid. The recovery rate of manganese can reach 99.1% or above, energy consumption is low, operation is easy, impurity removal is thorough, and the obtained product is high in quality.

The invention relates to a composite positive electrode material and a preparation method thereof, a positive plate and a battery in the technical field of lithium battery production. The composite positive electrode material comprises a core part of a lithium manganate positive electrode material and a coating layer positioned on the surface of the core part, the coating layer comprises a first coating layer and a second coating layer, and the first coating layer is positioned between the core surface of the lithium manganate positive electrode material and the second coating layer; the first coating layer is nickel cobalt lithium manganate (NCM), and the second coating layer is lithium iron phosphate (LFP). Through the synergistic protection effect of double-layer coating, the stability of the lithium manganate structure can be remarkably enhanced, and the high-temperature storage performance and the cycle performance of the battery cell are improved.

This application provides a lithium-rich manganese-based cathode material, its preparation method, and a lithium-ion battery, relating to the field of lithium-ion batteries. It includes a substrate and a first coating layer and a second coating layer sequentially stacked on the surface of the substrate; the substrate has the general chemical formula Li. a Ni x Co y Mn z M w O (1+a‑b) R b Wherein, M includes one or more of Al, Mg, Mn, Zr, Ti, W, Nb, Ta, Te, Na, La, and Sr, R includes one or more of Cl, N, and S, 1.2≤a≤1.4, 0≤b≤0.1, 0.25≤x≤0.4, 0≤y≤0.1, 0.6≤z≤0.75, 0

The preparation method comprises the following steps: adding MnO2 into deionized water, carrying out uniform ultrasonic dispersion, adding RuCl3.xH2O, carrying out uniform ultrasonic dispersion, slowly dropwise adding an excessive amount of a sodium borohydride aqueous solution into the dispersed solution under vigorous stirring, continuously carrying out a stirring reaction for 3-5 h after the dropwise addition is completed, and after the reaction is completed, carrying out filtration, washing and drying to obtain the Ru / Mn3O4-x hydrogen evolution electrocatalyst. And centrifuging and collecting solids, sequentially washing and drying, fully grinding the obtained sample, transferring to an inert gas atmosphere at 300-500 DEG C, and calcining for 1-2 hours to obtain the Ru / Mn3O4-x hydrogen evolution electrocatalyst. The Ru / Mn3O4-x hydrogen evolution electrocatalyst prepared by a wet chemical reduction method has good intrinsic activity and good electrochemical performance, the process is simple, the cost is low, and a new thought is provided for reasonably constructing a ruthenium-based electrocatalyst to improve the electrocatalytic activity.

The invention provides a multi-element lithium supplement agent and a preparation method thereof, a positive pole piece and a lithium ion battery, the multi-element lithium supplement agent comprises an inner core, a first coating layer and a second coating layer, the inner core comprises lithium-rich lithium aluminum ferrite, the first coating layer comprises lithium-rich lithium manganate, and the second coating layer comprises lithium-rich lithium nickelate; the chemical general formula of the multi-element lithium supplement agent is LixFeaAlbMncNidOy, 0.1 < = d / (a + b) < = 0.9, 0.62 < = a < = 0.96, 0.04 < = b < = 0.38, 0.005 < = c / (a + b) < = 0.02, 5a + 5b + 2c + 2d < = x < = 5.5 a + 5.5 b + 2.1 c + 2.1 d, and y = (x + 3a + 3b + 4c + 2d) / 2. Iron and aluminum are adopted as main elements, and lithium-rich lithium manganate and lithium-rich lithium nickelate are coated at the same time, so that the stability of the lithium supplementing agent can be improved, gas production can be reduced, the ionic conductivity can be improved, and the capacity exertion of the lithium supplementing agent can be promoted.

The invention relates to a preparation method of manganous-manganic oxide / graphite nano-enzyme for sensitive detection of L-cysteine, a green synthesis strategy is adopted, a mechanochemical method is combined to develop a novel Mn3O4 / graphite composite material which is low in cost, high in activity and easy to synthesize in macroscopic quantity, and the prepared product has relatively high catalytic activity and can be applied to the detection of L-cysteine. Compared with the prior art, the method has the advantages that oxidase-like activity is obviously improved, the Michaelis constant Km is 0.132, the maximum reaction rate Vmax is 0.998 * 10 <-7 > M <-1 > s, high-sensitivity and visual analysis and detection of L-Cys can be realized at normal temperature, the detection interval is 1-40 [mu] mol / L, and the detection limit is 0.361 [mu] mol / L.

The invention provides a positive electrode material and a preparation method thereof, a battery monomer, a battery device and a power utilization device. The positive electrode material comprises a sodium transition metal oxide and a silicate material located on the surface of the sodium transition metal oxide, the positive electrode material has the following chemical formula: NaxMyNzO2 / (aNa2O.nSiO2-XrOt.SiO2) b, M comprises one or more of Fe, In, Co, Mn, Ni and Cr, N comprises one or more of Cu, Li, Ti, Zr, K, Sb, Nb, Mg, Ca, Mo, Zn, W, Bi, Sr, Sn, Ga and Al, and X comprises one or more of Na, Li, K, Mg, Ca, Zn, Al, Cr, Sr, Sn and Sb; 0.58 < = x < = 1.05, 0 < y < = 1, 0 < = z < = 1, 0 < y + z < = 1, 1 / 3 < = r / t < = 2, 1 < = n / a, and 0 < b < = 0.2. The positive electrode material provided by the invention can improve the rate capability and the processability of the battery monomer.

The invention discloses a high-entropy perovskite hydroxide, a preparation method thereof and application of the high-entropy perovskite hydroxide in electro-catalysis of nitrate to synthesize ammonia, and belongs to the technical field of high-entropy perovskite hydroxides. The high-entropy perovskite hydroxide is ASn (OH) 6, and A is one or more of Zn, Mn, Co, Ni and Cu. The high-entropy perovskite hydroxide electrocatalyst which is simple in synthesis method, stable in structure and easy in raw material obtaining is obtained, the electrocatalyst can be applied to electrocatalysis of nitrate to synthesize ammonia, the highest NH3 Faraday efficiency is 98.16%, and the yield is 5.12 mg h <-1 > mgcat <-1 >. And a foundation is laid for developing other high-entropy perovskite compounds as electrocatalysts for electrocatalytic synthesis of nitrate.

A positive electrode active material for secondary batteries contains a lithium-metal composite oxide having a rock-salt type crystal structure assignable to space group Fm-3m. The lithium-metal composite oxide contains at least Li and Mn. The average roundness of particles of the lithium-metal composite oxide is 0.55 or more.

The invention relates to the technical field of battery materials, and particularly discloses a composite material for an aqueous ammonium ion / proton hybrid battery and a preparation method and application thereof. The conductive polymer coated manganese dioxide composite material is prepared by adopting an organic-inorganic interface reaction, the preparation process is simple and easy to operate, the required raw materials are low in cost and easy to obtain, and the synthesized material is a nanoscale material and has the advantages of good dispersity, high specific surface area, good conductivity, stable structure and the like; when the material is applied to the aqueous ammonium ion / proton mixed ion battery, the obtained battery material has excellent rate capability and stable cycle life, has a high application prospect, and provides a new design idea for the existing aqueous ammonium ion / proton mixed ion battery.

A positive electrode active material for secondary batteries includes a lithium metal composite oxide having a crystal structure that can be attributed to the space group Fm-3m. The lithium metal composite oxide contains at least Li, Mn, Ti, and M. The M is a positive element different from Li, Mn, and Ti. The crystallite size of the lithium metal composite oxide is in a range of 1 nm to 100 nm, or in an X-ray diffraction (XRD) profile using CuKα radiation of the lithium metal composite oxide, the half-value width of a diffraction peak attributed to the (200) plane is in a range of 0.1° to 1.8°, based on 2θ.

A positive electrode material, a preparation method thereof, a positive electrode sheet, and a sodium-ion battery are provided. The positive electrode active material has a chemical formula of NaxAyNiaFebMncCudAeOn, where A is selected from at least one of Zn, Mg, Ca, K, and Li, and the following conditions are satisfied: (1) 0.67 ≤ x ≤ 0.85, 0.01 ≤ y ≤ 0.2, and x + y ≤ 1; (2) 0.11 ≤ a ≤ 0.33, 0.11 ≤ b ≤ 0.33, 0.33 ≤ c ≤ 0.66, 0.11 ≤ d < 0.33, 0 ≤ e ≤ 0.1, and a + b + c + d = 1; (3) n satisfies that an algebraic sum of positive and negative valences in the chemical formula equals zero; under same values of x, a, b, c, d, and n, a sodium layer spacing in an unit cell of the positive electrode active material is reduced by 0.005 Å - 0.115 Å compared to that of NaxNiaFebMncCudOn. The positive electrode active material exhibits high rate performance, excellent cycling stability, and high-voltage durability, etc., and thus a resulting sodium-ion battery has excellent performance.

The invention belongs to the related field of battery materials, and discloses a lithium-rich manganese-based positive electrode material and a preparation method and application thereof, the lithium-rich manganese-based positive electrode material comprises a core, a transition layer and a coating layer, the transition layer at least coats part of the surface of the core, and the coating layer at least coats part of the surface of particles formed by the core and the transition layer. The transition layer and the coating layer not only can isolate electrolyte and improve the interface stability, but also can promote the transmission of lithium ions through the formed heterojunction structure; the transition layer is a lithium-rich material doped with an element M and an element N and is used for connecting the coating layer and the core and reducing the possibility of interface defects between the coating layer and the core, and lithium ions can be promoted to be transferred into the doped lithium-rich layer from the outer layer by doping the element M and the element N, so that the conductivity and the ion diffusion rate of the positive electrode material are improved; the inner layer is made of a pure-phase lithium-rich material and is homologous with the middle layer, and lithium ions can still be quickly embedded into the inner layer from the middle layer while high capacity is kept.

The application belongs to the technical field of inorganic nanometer material preparation, and particularly relates to a hollow manganese dioxide / cobalt manganate loaded nitrogen-doped carbon hybrid material and a preparation method thereof. The steps of the application are as follows: S1, dispersing manganese source material in N,N-dimethylformamide to form a uniform solution; S2, adding an organic ligand to the solution obtained in step S1 and continuously stirring to obtain a mixed solution, and then transferring the mixed solution to a reaction kettle for a solvothermal reaction; S3, sequentially washing and drying the product obtained through the solvothermal reaction, and then grinding the product and a cobalt salt to form a mixture powder; and S4, performing a high-temperature pyrolysis reaction on the mixture powder, and obtaining the hollow manganese dioxide / cobalt manganate loaded nitrogen-doped carbon hybrid material rich in mesopores and macropores after the reaction stops. The application has a large specific surface area and a multi-pore structure, slows down the migration and aggregation of metal particles and the loss of pyrolysis intermediates in the heat treatment process, and improves the electrochemical activity and stability of the transition metal / nitrogen-doped carbon electrocatalyst.

A method of making a disordered rock salt cathode material for lithium-ion batteries includes performing combustion synthesis with an aqueous solution of metal-containing compounds. The method may include a two-stage process having a first stage followed by a second stage. The first stage includes performing combustion synthesis to obtain a metal oxide precursor. The second stage includes one or more of lithiating, fluorinating, and annealing the metal oxide precursor to obtain a disordered rock salt (DRX) oxide or oxyfluoride. The obtained disordered rock salt (DRX) may have a chemical composition Li1+xMnyTM1-x-yO2-zFz wherein 0≤x≤0.3, 0.4≤y≤1, 0≤z≤0.3, and TM is one or more transition metals selected from a group of Ti, Zr, Mo, Nb, and V. A lithium-ion battery cathode including a disordered rock salt cathode material and a lithium-ion battery including the lithium-ion battery cathode are also provided.

The present invention relates to a positive electrode active material powder comprising secondary particles comprising a plurality of primary particles, in which the positive electrode active material powder comprises a lithium metal oxide comprising lithium (Li), M'and oxygen (O), in which the first lithium metal oxide has a layered [alpha]-NaFeO2 structure; wherein M'comprises titanium (Ti) and at least one element selected from the group consisting of nickel (Ni) and manganese (Mn); wherein there is a grain boundary between adjacent ones of the secondary particles; wherein the Ti concentration in the grain boundary is greater than the Ti concentration in the adjacent primary particles; and wherein the positive electrode active material powder has a surface area of between 0.3 m2 / g and 1.2 m2 / g, as determined by BET measurement.

The invention discloses a low-temperature plasma modified efficient hydrogen evolution catalyst. The method comprises the following steps: preparing a nano core-shell structure catalyst with uniform size through liquid-phase synthesis and layer-by-layer self-assembly, and introducing vacancies, defects and other unsaturated active sites on the surface of the nano core-shell structure catalyst; and then nitrogen and the like are used as a reaction atmosphere of a plasma chamber, and the surface of the catalyst is treated through a low-temperature plasma technology for catalyst performance regulation and control. The method has the advantages of simple process, low energy consumption, no need of adding extra chemical reagents, environmental friendliness and the like, and has a good application prospect. The preparation and regulation method of the electrocatalyst can be suitable for application of an electrocatalytic efficient hydrogen evolution catalyst. The material regulated and controlled by the plasma has higher current density and lower overpotential in hydrogen evolution reaction, and shows more excellent electrocatalytic activity and stability.

To provide a positive electrode active material which can stably maintain an original layered structure without excessively compromising the symmetry of an electronic structure even after a charge and a discharge are repeated, to satisfy the required performance of a secondary battery, the capacity of the positive electrode active material being larger than the effective capacity of lithium cobalt oxide.SOLUTION: A positive electrode active material for an alkaline ion secondary battery is made of ByMO2 when the material is manufactured or is fully charged and is specifically made of an oxide crystal of an alkaline metal B, a transition metal M, and an oxygen atom O as the basic constituent elements of a layered structure (1: movable ions A, 2: an alkaline metal B existing between layers, 3: an octahedron as an oxygen 6-orientation made of the transition metal M and the oxygen O), and the Shannon ions radius is so set that movable ions A is smaller than movable ions B. The existence of B between layers suppresses change in the distance between layers if A is inserted between the layers or is separated from between layers (charge and discharge). The relation A>B in the ion diffusion coefficients makes the layered structure harder to break, and increase of the capacity at a high-rate charge / discharge can be thus attained.SELECTED DRAWING: Figure 1

The present invention relates to novel transition metal oxyfluoride compounds and methods for manufacturing said novel transition metal oxyfluorides. The inventors have demonstrated that by treating the transition metal oxides with a fluorine containing gas the corresponding transition metal oxyfluoride compounds are obtained.

The application belongs to the technical field of lithium ion battery electrode materials, and specifically discloses a one-dimensional lithium manganate nanorod with controllable diameter and a preparation method and application thereof. The application disperses manganese sulfate, potassium permanganate, a structure directing agent and a surfactant into a solvent, carries out a hydrothermal reaction, and obtains black precipitate; then the black precipitate is sintered to obtain manganese dioxide nanorods; the manganese dioxide nanorods are mixed with lithium hydroxide, and two-stage sintering is carried out to obtain one-dimensional lithium manganate nanorods. The one-dimensional lithium manganate nanorods are uniform in thickness and have very small surface energy, when used as a positive electrode material, can effectively shorten the transmission path of lithium ions, are not prone to agglomeration and have good flexibility, can maintain the integrity of the structure during long-time service under a large current, and are beneficial to improving the rate and cycle performance of the electrode. In addition, by adjusting the concentration of potassium permanganate and the hydrothermal reaction temperature, the diameter of the manganese dioxide can be accurately adjusted, and the controllable preparation of the one-dimensional lithium manganate can be realized.

The invention provides a lithium-rich manganese-based positive electrode material, a preparation method thereof and a lithium ion battery containing the lithium-rich manganese-based positive electrode material, and belongs to the field of lithium ion batteries. The chemical formula of the lithium-rich manganese-based positive electrode material is xLi < 2 > MnO < 3 >. (1-x) LiTMO2, 0 lt, xlt; 1, TM is selected from Ni, Co and Mn; the lithium-rich manganese-based positive electrode material comprises a monoclinic Li2MnO3 phase and a rhombic LiTMO2 phase, the content of the monoclinic Li2MnO3 phase is sequentially reduced from inside to outside, the content of the rhombic LiTMO2 phase is sequentially increased from inside to outside, and a spinel phase layer is arranged on the surface of the lithium-rich manganese-based positive electrode material. The lithium-rich manganese-based positive electrode material prepared by the method has the advantages of high thermal stability, high compactness and high cycle performance.