19 results about "Sodium manganate" patented technology

The invention discloses a sodium manganate positive electrode material with an interlayer stacking structure as well as a preparation method and application of the sodium manganate positive electrode material. The sodium manganate positive electrode material has an ABB 'C' ABB 'C' type oxygen layer stacking sequence, Mg < 2 + > ions specifically occupy twisted triangular prism sites in an alkali metal sodium layer, and P type and O type NaO6 coordination polyhedrons exist in a crystal structure of the material at the same time. Through a composite three-step synthesis process of'sol-gel-solvothermal-solid phase method ', the thermodynamic tendency that conventional magnesium ions occupy a transition metal layer is effectively broken, and synergistic distortion of prismatic interstitial sites is realized, so that a brand new symmetric structure different from a traditional P phase and a traditional O phase is constructed. According to the positive electrode material disclosed by the invention, unfavorable phase transformation in the charging and discharging process is remarkably relieved through a special lattice stacking structure, the positive electrode material has high capacity and long cycle life, and a new thought is provided for the design of a high-energy-density sodium or potassium ion battery.

The application relates to the technical field of sodium ion batteries, in particular to a sodium ion positive electrode material, a preparation method thereof and a sodium ion positive electrode sheet, wherein the sodium ion positive electrode material comprises a sodium nickel-iron-manganese acid base and an organic conductive coating, the organic conductive coating is coated on the sodium nickel-iron-manganese acid base, and the organic conductive coating comprises polyacrylonitrile and a conductive agent. The sodium ion positive electrode material of the application is coated with an organic conductive coating on the surface of the sodium nickel-iron-manganese acid material, the organic conductive coating comprises polyacrylonitrile and a conductive agent, the polyacrylonitrile can effectively prevent chemical reaction between the positive electrode material and an aluminum foil, the conductive agent connects the positive electrode material and the aluminum foil, and the resistance of the positive electrode sheet is reduced. Compared with the positive electrode material coated with aluminum oxide, the compaction density of the sodium ion positive electrode sheet prepared from the sodium ion positive electrode material of the application is increased by 0.1 g / cm 3 -0.2 g / cm 3 , the capacity of the prepared sodium ion battery is increased by 14%-25%, and the cycle life is increased by 40%-80%.

This invention discloses a photothermal synergistic phase change composite thin film based on a heterostructure and its preparation method, belonging to the technical field of nanomaterials and composite phase change materials. The composite thin film includes a heterostructured photothermal carrier film and a phase change material confined and loaded thereon. The heterostructured photothermal carrier film uses manganese oxide coated with a carbon layer as a framework, with heterostructured functional units composed of metal particles constructed in situ on its surface. Sodium manganate, as a precursor film for the heterostructure construction, is modified with a metal-organic coordination structure and derivatized in an inert atmosphere to form a heterostructure interface on its surface where the carbon layer and metal particles are coupled in situ, further confining and loading the phase change material. The carbon layer and metal particles form a tightly contacted interface structure on the manganese oxide surface, which enhances light absorption and regulates heat conduction behavior under illumination, thereby achieving efficient conversion of light energy into heat energy and synergistically completing the storage and release of heat energy with the phase change material. This invention effectively improves the photothermal conversion efficiency and thermal energy utilization performance of composite films by constructing a heterogeneous structure interface coupling carbon layers and metal particles. The resulting composite film has rapid heating, stable heat storage and good cycle stability, and has good application prospects in the fields of solar thermal storage and thermal management.

A titanium-cobalt co-doped sodium manganate-based cathode material, its preparation method, and its application, relating to the field of sodium-ion battery technology, wherein the general structural formula of the titanium-cobalt co-doped sodium manganate-based cathode material is Na. 0.44 Mn 0.95 Co x Ti 0.05‑x O2, wherein titanium and cobalt are both doped at manganese sites and the sum of the molar fractions of titanium and cobalt is 0.05, and x is the molar fraction of cobalt doped at manganese sites, 0 < x ≤ 0.03. This invention constructs a stable doping system by synergistically introducing titanium and cobalt elements into the transition metal sites of sodium manganate cathode material without disrupting the main crystal lattice structure, inducing the formation of a sodium vacancy environment conducive to sodium ion migration, thereby improving the overall structural stability of the material.

The invention discloses a sodium ion battery capable of improving rapid charging performance, performance breakthrough is realized through common optimization design of multiple components of positive and negative electrode materials, a diaphragm and electrolyte, and the positive electrode material is composed of sodium nickel iron manganese oxide, polyvinylidene fluoride, conductive carbon black and carbon nanotubes; a negative electrode material adopts a hard carbon material matched with a conductive agent and a composite binder, and the binder comprises sodium carboxymethyl cellulose, 3-(5-(2-nitrophenyl)-2-furan) acrylic acid and 4-(hydroxymethyl) phenylboronic acid pinacol ester; the diaphragm is a ceramic coating polyvinyl base membrane, the electrolyte takes sodium hexafluorophosphate as an electrolyte and is matched with an electrolyte additive and a composite solvent, and the electrolyte additive comprises three to five of sodium bis (fluorosulfonyl) imide, sodium difluorophosphate, sodium difluoro (oxalato) borate, ethylene sulfate, fluoroethylene carbonate and ethylene sulfite. The composite solvent comprises methyl ethyl carbonate, propylene carbonate and diethyl carbonate.

The invention discloses a Ca / Mg co-doped sodium nickel manganese oxide positive electrode material, a preparation method thereof, a pole piece and a battery, and belongs to the field of batteries. According to the Ca / Mg co-doped sodium nickel manganese oxide positive electrode material, three different metal cations of nickel, manganese and magnesium are contained in a transition metal layer, two different metal cations of sodium and calcium are contained in a sodium layer, and the chemical formula of the Ca / Mg co-doped sodium nickel manganese oxide positive electrode material is Na < 0.61 > Ca < 0.03 > Ni < 0.23 > Mg < 0.10 > Mn < 0.67 > O2; the Ca / Mg co-doped sodium nickel manganese oxide positive electrode material is of a P2 type; the problem that an existing P2 type Na < 0.67 > Ni < 0.33 > Mn < 0.67 > O < 2 > positive electrode material is poor in cycling stability and structural reversibility in a high-voltage interval is solved.

The invention discloses a W (VI)-doped sodium manganate single-crystal positive electrode material and a preparation method and application thereof in a sodium ion battery, the W (VI)-doped sodium manganate single-crystal positive electrode material has a P2-type layered structure and is in a single-crystal form, the chemical general formula of the W (VI)-doped sodium manganate single-crystal positive electrode material is NaxWyMn1-yOz, 0.6 < = x < = 0.85, 0.005 < = y < = 0.02, 2.0 < = z < = 2.1, and the W (VI)-doped sodium manganate single-crystal positive electrode material is a W (VI)-doped sodium manganate single-crystal positive electrode material and a W (VI)-doped sodium manganate single-crystal positive electrode material. The invention also specifically discloses a preparation method of the W (VI)-doped sodium manganate single-crystal positive electrode material and an application of the W (VI)-doped sodium manganate single-crystal positive electrode material in a sodium ion battery. The W (VI)-doped sodium manganate single-crystal positive electrode material prepared by the invention has the characteristic of no grain boundary, can effectively relieve mechanical stress and reduce electrolyte erosion, so that the cycle stability of a battery is remarkably improved, and the W (VI)-doped sodium manganate single-crystal positive electrode material has important application value in the fields of sodium ion battery electrode preparation and energy storage equipment research.

The application belongs to the technical field of sodium-ion battery cathode material preparation, and particularly relates to a high-sodium-content sodium manganate cathode material and a preparation method and application thereof; the high-sodium-content sodium manganate material is prepared by using a simple and feasible solid-phase method, raw materials are first subjected to ball milling and pre-sintering treatment, so that the raw materials are mixed more uniformly to obtain a sodium manganate precursor, then the precursor is pressed into a round sheet, the particles are in closer contact, and the area available for reaction is more, then the surface phase and internal uniform heating of the precursor are realized by using a microwave heating mode, so that the reaction is more consistent at the same rate, and the generation of a heterogeneous phase is avoided. The preparation process can be scaled up in industry at equal proportions, the rate performance of the two prepared materials is relatively excellent, the discharge capacity is about 110 mAh / g at 0.1C, the discharge capacity is about 100 mAh / g at 0.2C, when the rate is increased to 5C, the capacity is still about 40 mAh / g, and the material has a good application prospect in the field of sodium-ion batteries.

The invention discloses a preparation method of a Ti < 4 + >-doped sodium manganate material and application of the Ti < 4 + >-doped sodium manganate material in a sodium ion battery, and provides an improved strategy of titanium doping through a high-temperature solid-phase reaction, and the improved strategy changes the electronic structure and morphology of the material at the same time. Due to the addition of Ti < 4 + >, the interlayer spacing is increased, rapid diffusion of sodium ions is promoted, the structural evolution from a two-dimensional (2D) flat plate to a one-dimensional (1D) nanorod is also caused, and an additional sodium ion storage position is created. The electrochemical performance of the Na0. 7MnO2.05 positive electrode material is jointly improved through the synergistic effect of electronic modulation, Ti < 4 + > doping and nanostructure engineering. The preparation method is simple, raw materials are easy to obtain, and the process is simple. Tests show that a battery using the doped modified positive electrode material has a good capacity retention rate, and the sodium ion battery positive electrode material has excellent structural stability and cycle performance, so that the actual service life of the sodium ion battery is effectively prolonged.

The invention discloses a sodium nickel manganese oxide layered oxide material as well as a preparation method and application thereof, and relates to the technical field of preparation of sodium ion battery positive electrode materials. According to the preparation method disclosed by the invention, the P2-type sodium nickel manganese oxide layered oxide material with more {001} exposed surfaces can be obtained, the stability of a crystal structure of the material is improved, and the P2-type sodium nickel manganese oxide layered oxide material has excellent cycling stability in a high-voltage region as a sodium-ion battery positive electrode material and is suitable for being applied under high voltage.

This invention relates to the field of sodium-ion battery technology, and particularly to a sodium iron manganese oxide layered cathode material, its molten salt preparation method, and its application. The preparation method includes: weighing sodium source, manganese source, iron source, and potassium chloride molten salt according to stoichiometric ratios; adding anhydrous ethanol and ball milling to obtain a precursor; pressing the dried precursor powder and calcining it; grinding the calcined material into a fine powder; filtering and washing with deionized water and anhydrous ethanol; drying; and then annealing to obtain the sodium iron manganese oxide layered cathode material. The cathode material prepared using the molten salt method exhibits an initial discharge capacity of 214 mAh / g at 0.1C, a discharge capacity of 175 mAh / g at 1C, and a discharge capacity retention rate of 64.91% after 100 cycles. This invention has a simple preparation method, high safety, and is suitable for large-scale industrial production, and can be widely applied in the field of layered cathodes for sodium-ion batteries.

The invention provides a nickel iron sodium manganate positive electrode material, a preparation method thereof and a sodium ion battery, and belongs to the technical field of sodium ion battery positive electrode material manufacturing. The nickel iron sodium manganate positive electrode material comprises a matrix and a surface layer located outside the matrix, both the matrix and the surface layer are doped with P, only the surface layer is doped with F, and the positive electrode material has relatively excellent structural stability, so that the corresponding battery has the advantage of less gas production in the cycle process.

This invention provides a nanosheet-like ternary sodium nickel iron manganese oxide cathode material, its preparation method, and its applications. The ternary sodium nickel iron manganese oxide cathode material has a nanosheet structure, and the spacing between the transition metal oxide layer and the sodium layer, as well as the valence state of Mn, are controlled by varying the contents of Fe and Ni. The molecular formula is Na. x Ni 1 / 3‑y Fe y Mn 2 / 3 O2 where 0.44≤x≤0.67, 0≤y≤1 / 3; also provides a preparation method for this material: mix and dissolve transition metal salts of nickel, iron and manganese, then add sodium salt to dissolve to obtain a mixed metal ion salt solution, add citric acid dropwise, heat and stir, dry, and sinter to obtain a ternary nickel-iron-manganese sodium cathode material.

This invention discloses a method and application for controlling the interface concentration of electrode materials. The interface concentration control is achieved by coating a protective layer onto a common electrode material. The protective layer has the chemical formula XPAN, where X is one of S, Se, Te, P, and I. XPAN is generated by reacting elemental X with polyacrylonitrile (PAN) under high-temperature conditions. The common electrode material is one of lithium iron phosphate, lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium manganese oxide, sodium iron manganese oxide, sodium vanadium phosphate, graphite, hard carbon, or silicon-carbon composites. The electrode material is obtained by first coating the surface of a commercial electrode material with PAN, and then annealing the PAN-coated commercial electrode material with elemental X under an argon atmosphere. The reaction of X in XPAN with the high-temperature cyclized PAN produces a stable chemical structure. During charge-discharge using a commercial ester electrolyte, the interface concentration is controlled through the electrochemical reaction of XPAN, thereby enhancing the battery's cycle performance and stability.

Methods and compositions for rapid verification of cleaning performance on surfaces in cleaning-in-place (CIP) systems and in cleaning-in-place (COP) systems and in high flow areas. The solution comprises alkali metal hydroxide; one or more oxidizing compounds, wherein the one or more oxidizing compounds comprise sodium hypochlorite, potassium hypochlorite, sodium persulfate, potassium persulfate and monopersulfate; and one or more compounds selected from the group consisting of potassium permanganate, sodium permanganate, potassium dichromate, and sodium dichromate. In some examples, the solution also includes potassium tripolyphosphate, sodium tripolyphosphate, or other tripolyphosphate. The substrate is in contact with the solution, and a chromogenic reaction may occur indicating the presence of an organic substance or non-organic contaminant. The chromogenic reaction may occur within less than 30 minutes and at a temperature of 10 DEG C to 60 DEG C.

To provide a method for producing an aqueous solution of sodium manganate having high solubility from a by-product of a smelting process of a metal containing manganese dioxide at a low production cost.SOLUTION: A method for producing an aqueous sodium manganate solution, comprising an oxidation step of heating a slurry obtained by mixing a manganese compound containing manganese dioxide and an aqueous sodium hydroxide solution in an oxidizing atmosphere in a temperature range of 200 °C or more and 700 °C or less to oxidize tetravalent manganese to hexavalent manganese, and a leaching step of immersing a solid containing hexavalent manganese obtained in the oxidation step in an alkaline aqueous solution to leach out hexavalent manganese as manganate ions.SELECTED DRAWING: None

The invention belongs to the field of sodium ion batteries, and particularly relates to a nickel iron sodium manganate battery and an electrolyte thereof, the electrolyte comprises a composite solvent and a conductive sodium salt, and the composite solvent comprises a formula 1 (1), a formula 2 (2) and a formula 3 (3) in a volume ratio of (2-5): (1.5-3): 1; the conductive sodium salt is a compound with a structure shown in a formula 4 (). Researches show that the combination of the formula 1, the formula 2 and the formula 3 is matched with the combined control of the proportions, so that the synergism can be realized, the physicochemical characteristics of the high-voltage nickel iron sodium manganate can be adapted, and the electrochemical performance of the high-voltage nickel iron sodium manganate can be improved.

The application discloses a high-specific-capacity sodium-ion battery positive electrode material, a preparation method thereof and a sodium-ion battery, and the positive electrode material is sodium manganate oxide which is modified by jointly doping elements N and M. x Mn 1‑y‑z N y M z O2, wherein 0.22<=x<=0.6, 0