17results about "Manganates/permanganates" patented technology

The present application belongs to the technical field of inorganic chemical industry, and particularly relates to a method for preparing manganese vanadate from vanadium pentoxide. The method for preparing manganese vanadate from vanadium pentoxide is original, and the method for preparing manganese vanadate by roasting vanadium pentoxide in an inert gas atmosphere is used. Vanadium pentoxide powder is mixed with manganese carbonate (or manganese oxide) reagent to obtain manganese vanadate. As one of ternary vanadates, manganese vanadate has good electrochemical performance and optical performance, and can be applied in batteries and photoelectric materials. The method has great significance for the study of vanadium slag leaching mechanism and the development of subsequent products.

The application belongs to the technical field of lithium batteries, and discloses a modified lithium manganate electrode material and a modification method thereof.The modification method comprises the following steps: mixing lithium manganate with a hydrogen peroxide solution to obtain the surface-modified lithium manganate electrode material.Through the surface modification method, the surface impurities of the spinel lithium manganate can be effectively removed without obvious influence on the crystal structure, the surface smoothness is improved, the diffusion rate of Li + is accelerated, the agglomeration of the spinel lithium manganate particles is effectively inhibited, and thus the phenomenon that the internal stress between the agglomerated particles causes micro-cracks on the surface of the material is effectively inhibited.The surface-modified lithium manganate electrode material has excellent electrochemical performance.The surface modification method is simple, low in cost, and suitable for industrial production.The application has low requirements on equipment, is simple to operate, has no special requirements on the production process, causes no pollution in the production process, and is friendly to the environment.

A cathode active material according to embodiments of the present disclosure includes: lithium metal oxide particles; and a conductive coating that partially covers the surface of the lithium metal oxide particles and includes a plurality of conductive particles. The conductive coating includes a first pattern having an island shape and a second pattern having a chain shape. According to embodiments of the present disclosure, the cathode active material may be formed by stirring lithium metal oxide particles and conductive particles using a resonant mixer. According to embodiments of the present disclosure, a lithium secondary battery including the above-described cathode active material may be provided.

The application belongs to the technical field of solid oxide fuel cell anode catalyst, and particularly relates to a preparation of a multi-doped layered perovskite anode and application thereof in ammonia solid oxide fuel cells. x Ba 1–x Mn 1–y TM y O 3–δ (0.4<=x<=0.6, 0<=y<=0.3, TM=Co, Fe, Cu), the precursor is phase changed under a reducing atmosphere to form a PrBaMn2O 5+δ layered perovskite with rich oxygen vacancies, and the doped transition metal is precipitated in the form of an alloy and anchored on the surface of the layered perovskite. The anode catalyst has a simple synthesis method, low cost, rich and flexible adjustable element composition. The obtained anode catalyst is made into a slurry and then assembled into a solid oxide fuel cell single cell sheet. The solid oxide fuel cell prepared by the application has good power output, electrical conductivity and stability at medium and high temperatures.

Cathodes and electrochemical cells are provided, wherein a barium, bismuth, or nickel additive is included to increase the stability of manganese dioxide at high voltage. The metal additives provided herein improve the performance of electrochemical cells.

This invention belongs to the field of battery cathode material technology, specifically relating to a core-shell structured manganese tetroxide, its preparation method, and its application. The preparation method of the core-shell structured manganese tetroxide of this invention includes the following steps: (1) adding PEG, ZIF-8, and Zn to a container containing a manganese sulfate solution. 2+ (1) Ammonia solution is introduced into the container and heated to react; (2) After the reaction is completed, the solid and liquid are separated, and the obtained solid is washed and dried to obtain an intermediate product; (3) The intermediate product is calcined to obtain the core-shell structured manganese tetroxide. The core-shell structured manganese tetroxide of the present invention helps to solve the problems of rapid cycle decay, poor rate performance or insufficient compaction density in the sintering preparation process of lithium manganese oxide using manganese tetroxide in the prior art.

The application discloses a manganese-zinc ferrite / graphene composite aerogel material and a preparation method thereof. The raw materials of the material comprise manganese-zinc ferrite and graphene oxide; the mass ratio of the manganese-zinc ferrite to the graphene oxide is 0.06-0.18:1; and the manganese-zinc ferrite and the graphene oxide are combined into the composite aerogel material through a hydrothermal reaction and freeze drying. The technical scheme has the advantages of improving impedance matching of graphene aerogel, widening an effective absorption bandwidth and obtaining light weight and high efficiency.

A compound of the present invention contains, as a constituent element, two or more elements selected from H, an alkali metal, an alkaline earth metal, a rare earth element, B, F, Al, Si, P, S, Cl, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Se, Br, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Cd, In, Sn, Sb, Te, I, Hf, Ta, W, Re, Os, Ir, Pt, Tl, Pb, and Bi.

This invention provides a method for surface modification of lithium-rich manganese-based cathode materials, comprising: (1) dissolving a polymer with multiple carboxyl functional groups in deionized water to obtain a coating agent aqueous solution of 0.1–10 mg / mL; (2) dissolving a soluble inorganic salt containing a modified metal element in deionized water to obtain a metal precursor solution; (3) uniformly dispersing the lithium-rich manganese-based cathode material in the coating agent aqueous solution, and then adding the metal precursor solution, or mixing the coating agent aqueous solution and the metal precursor solution before uniformly dispersing the lithium-rich manganese-based cathode material therein; (4) washing and filtering the reactants obtained in step (3), and then heat-treating them under an oxygen-free atmosphere to form a metal ion gradient doping in the lithium-rich manganese-based cathode material, and forming a metal oxide layer, a spinel phase, and a carbon layer sequentially from the inside to the outside on the surface of the lithium-rich manganese-based cathode material. This invention improves the comprehensive electrochemical performance of the modified lithium-rich manganese-based cathode material.

The present invention relates to a positive electrode active material for a lithium secondary battery, which is a layered lithium transition metal oxide containing an excess of lithium and manganese, wherein the positive electrode active material is a secondary particle formed by aggregation of a plurality of primary particles, and the primary particles include plate-shaped particles and have an average aspect ratio of 5 to 90.

This invention belongs to the technical field of lithium iron manganese phosphate battery materials, specifically disclosing a nickel-aluminum in-situ doped manganese tetroxide and its preparation method. Based on the elemental composition of the target doped manganese tetroxide, this invention establishes an elemental doping amount control model. Based on this model, the feeding mechanism of the complexing agent and mixed salt solution can be synergistically adjusted, achieving precise matching of the stoichiometric ratio of the doping elements while obtaining doped manganese tetroxide products with large specific surface area, high tap density, and suitable uniform particle size. Furthermore, the method of this invention can achieve atomic-level uniform distribution between manganese and the doping elements, resulting in products with good doping uniformity, high product stability, and low doping element content in the reaction residue, thus exhibiting the advantage of high raw material utilization.

This invention aims to provide a micron-sized spherical cerium-manganese-based composite oxide and its preparation method, characterized in that the particle size of the cerium-manganese-based composite oxide is in the range of 2–4 μm, and the specific surface area is in the range of 10⁸–13² m². 2 Within the range of / g; the molar ratio of Ce to Mn is 1:6 to 8, and the molar ratio of the doped co-catalytic metal element to Ce is (0.1 to 1.5):1. The main preparation process involves dissolving cerium, manganese, and the metal salt of the dopant element in a polyol to prepare a mixed solution, carrying out a hydrothermal reaction in a reactor, collecting the precipitate by centrifugation, and then obtaining micron-sized spherical cerium-manganese-based composite oxides through washing, drying, and calcination. The specific surface area of ​​this cerium-manganese-based composite oxide is 108 to 132 m². 2 / g, capable of efficiently removing NO by NH3-SCR within the range of 54–275℃. x It maintains a denitrification efficiency of over 99% for a long time under a high-humidity sulfur-containing atmosphere at 127℃, making it particularly suitable for deep denitrification of complex flue gas with high humidity and sulfur content after desulfurization and dust removal in non-power industries.

The application provides a porous copper-manganese bimetallic nanomaterial applied to tumor immunotherapy and a preparation method thereof. The application obtains the hollow mesoporous copper-manganese bimetallic nanomaterial with uniform particle size through a cuprous oxide self-template etching method, then the nanomaterial is used to load a photosensitizer IR820 due to excellent drug loading capacity, and finally the nanomaterial is modified by mercapto polyethylene glycol to increase the dispersibility of the nanoparticles. The preparation method is stable and reliable, low in cost and wide in source, and has the advantages of simple process, practicality, strong controllability and the like. The nanomaterial has multifunctionality, can realize synergistic treatment of photothermal treatment / photodynamic treatment / chemical dynamic treatment, improve cell hypoxia, consume glutathione, remodel a tumor microenvironment, finally induce immunogenic death of tumor cells, enhance the immune response of tumor cells, efficiently inhibit tumor growth and metastasis, and has a broad application prospect.

This invention provides a Co-doped δ-MnO2 material, its preparation method, and its applications, belonging to the field of new energy storage technology. This invention uses a simple one-step hydrothermal method with manganese and cobalt sources to obtain a δ-MnO2 cathode material with appropriate amounts of Co doping and oxygen vacancies, which can be achieved at 0.5 A g. ‑1 Down 655.7 mA hg ‑1 It exhibits a large specific capacitance and high rate performance with large capacity characteristics. When the current density increases to 20 A g... ‑1 Its specific capacity can still be maintained at 209.8 mA hg ‑1 This provides a high-quality candidate cathode material for building a new generation of high-performance zinc-ion batteries.

The application discloses a method for preparing pure-phase CuMn2O4-based high-entropy spinel oxide at low temperature in a green way, and the method comprises the following steps: collecting plant leaves, washing, drying, weighing, bagging and leaching to obtain a plant extract; adding nitrate precursors of copper, zinc, manganese, aluminum and chromium into the plant extract, stirring and drying to obtain a dry gel; and calcining (as low as 350 DEG C) the dry gel to obtain the pure-phase CuMn2O4-based high-entropy spinel oxide. The synthesis process of the pure-phase high-entropy spinel oxide is simple, the plant extract is used, the pure-phase high-entropy spinel oxide has the advantages of green environmental protection, low cost and energy consumption reduction, and is beneficial to the green preparation and large-scale production of the spinel oxide.

The application belongs to the field of battery materials, and particularly relates to a lanthanum-doped manganese dioxide nanowire material and a preparation method and application thereof. The preparation method comprises the following steps: S1, dissolving manganese sulfate and a soluble lanthanum salt in deionized water to form a uniform solution A by stirring at room temperature; S2, dissolving potassium permanganate in deionized water to form a solution B; S3, slowly dropping the solution B into the solution A, and continuously stirring to obtain a mixed solution C; S4, adding appropriate dilute sulfuric acid to adjust the pH to obtain a mixed solution D; S5, ultrasonic treatment; S6, loading the mixed solution D into a polytetrafluoroethylene reaction kettle, sealing, and placing in an oven to perform a hydrothermal reaction; S7, cooling to room temperature after the reaction is completed, repeatedly cleaning with alcohol and deionized water, and centrifugally collecting the product to obtain the lanthanum-doped manganese dioxide nanowire material. The material is applied in a water-based zinc ion battery as a positive electrode material, can simultaneously improve the intrinsic electrical conductivity and structural stability, and the developed water-based zinc ion battery has good performance and a long service life. The preparation process is simple, the cost is low, the yield is high, and the industrial production and application potential are huge.

This invention proposes a positive electrode sodium supplement agent, its preparation method, and its application. The positive electrode sodium supplement agent is Na2MnO. 3‑x x is 0.1-0.3, where x is the oxygen vacancy content. This invention proposes a positive electrode sodium supplement agent, its preparation method, and its application. This agent can reduce the sodium removal potential, improve the air stability of the positive electrode sodium supplement agent, and exhibit a gentler volume change, significantly enhancing the sodium supplementation effect and improving the initial coulombic efficiency, cycle life, and safety performance of the full cell.