197 results about "Spinel group" patented technology

The present invention provides a spinel glass-ceramic, a chemically strengthened glass-ceramic and an application thereof. The spinel glass-ceramic comprises a main crystalline phase (Zn, Mg)Al2O4; the average transmittance of the spinel glass-ceramic with a thickness of 0.7 mm in a visible light range is less than or equal to 70.00%; the composition of the spinel glass-ceramic, expressed in molar percentage of oxides, comprises: SiO2 38.00 mol% to 48.30 mol%, Al2O3 25.50 mol% to 30.00 mol%, MgO 5.00 mol% to 8.00 mol%, ZnO 8.00 mol% to 14.00 mol%, ZrO2 3.00 mol% to 5.00 mol%, Na2O 7.20 mol% to 14.00 mol%, K2O 0.00 mol% to 2.00 mol%, B2O3 3.00 mol% to 8.00 mol%, Y2O3 0.00mol%~1.00mol%, BaO0.00mol%~2.10mol%; the composition of the spinel glass-ceramic does not include Li2O. The spinel glass-ceramic provided by the present invention has high intrinsic strength, and can be chemically strengthened to obtain chemically strengthened glass-ceramic with excellent drop impact resistance, which can meet the use requirements of electronic equipment protective glass. The spinel glass-ceramic provided by the present invention does not require the use of expensive lithium, and has better economic benefits compared to the existing lithium-containing spinel glass-ceramic.

The invention discloses a negative temperature coefficient medium-entropy thermistor material as well as a preparation method and application thereof. According to the invention, manganese dioxide, nickel oxide, cobalt sesquioxide, zinc oxide and copper oxide are used as raw materials, and a solid-phase reaction method is adopted to prepare the negative temperature coefficient medium-entropy thermistor material with a chemical formula of (NiX1CoX2ZnX3CuX4) Mn2O4. Wherein the values of X1, X2, X3 and X4 are 0.075-0.425, and X1 + X2 + X3 + X4 = 1. The negative temperature coefficient medium-entropy thermistor material is of a single spinel structure. The material has the hysteresis diffusion effect of medium-entropy ceramic, and by combining the coordinated optimization effect of multiple components, the material constant and the resistivity of the thermal sensitive ceramic can be remarkably reduced, and the anti-aging performance can be improved.

The invention discloses a method for preparing a high-entropy spinel type oxide material through microwave hydrothermal treatment and a product and application of the high-entropy spinel type oxide material, and belongs to the technical field of material science and chemical engineering.The method comprises the following steps that six metal sources of iron, cobalt, nickel, chromium, zinc and copper are dissolved in water according to the metal ion equimolar ratio and stirred to be uniform, and a mixed solution is obtained; adding a precipitator into the mixed solution, and then sequentially carrying out microwave hydrothermal treatment, cooling, washing, centrifuging, drying and calcining treatment to obtain the high-entropy spinel type oxide material (FeCoNiCrZnCu) 3O4. According to the invention, the spinel type oxide is subjected to high-entropy design, and the high-entropy spinel material with excellent water electrolysis catalytic performance is synthesized. On one hand, the raw material for synthesizing the material is relatively cheap transition metal nitrate, the source is wide, and the cost is low; and on the other hand, the microwave hydrothermal method can efficiently synthesize the high-entropy spinel material under mild reaction conditions, and has the characteristics of greenness and environmental protection.

A nanocomposite having ionic conductivity and having the general formula CuO·MgAl2O4 wherein: copper oxide (CuO) is present in an amount of from about 5 to about 15 weight percent (wt. %) of the total weight of the nanocomposite; and, CuO is present as a monoclinic crystal phase within the nanocomposite, as determined by X-ray diffraction (XRD).

The invention relates to the field of furnace lining materials, in particular to a rapid repairing material for a tapping hole and a furnace lining of an intermediate frequency furnace. The rapid repairing material comprises the following components in parts by weight: 50-70 parts of tabular corundum, 10-20 parts of fused magnesite, 8-15 parts of alumina micro powder, 3-8 parts of nano zirconia, 5-12 parts of silicon carbide, 10-15 parts of silica sol and 2-5 parts of a reinforcing agent. Wherein the reinforcing agent is titanium calcium aluminate coated with chromium nickel boride. The tabular corundum is mainly used as an integral framework; the fused magnesite is matched with the alumina micro powder to form magnesium aluminate spinel with a high melting point; the nano zirconium oxide can fill pores and is excellent in toughness; the silicon carbide has the advantages of high hardness, high thermal conductivity and high melting point; the reinforcing agent is titanium calcium aluminate coated with chromium nickel boride, although the adding amount is small, the high-temperature strength, toughness and thermal shock resistance of the repairing material can be remarkably improved, and especially the long-term corrosion resistance can be remarkably improved.

The invention relates to the technical field of high-temperature-resistant composite coatings, in particular to an atomic-scale complex-phase high-entropy oxide coating material and preparation and application thereof. The preparation method comprises the following steps: firstly, dissolving Mg2AlO4 and transition metal alloy powder, mixing, and carrying out ball milling to obtain spinel-structure high-entropy oxide precursor powder; then carrying out freeze drying treatment on the spinel structure high-entropy oxide precursor powder, and then carrying out sintering treatment to obtain spinel structure high-entropy oxide powder; dissolving metal salt, and blending to obtain a mixed solution; and finally, uniformly mixing the spinel-structure high-entropy oxide powder with the mixed solution, carrying out solvothermal reaction, and carrying out post-treatment to obtain the atomic-scale complex-phase high-entropy oxide coating material. The coating material provided by the invention has high-stability infrared radiation performance and can resist high-temperature oxidation.

The present disclosure relates a high entropy oxide and preparation method thereof. Specifically, the present disclosure provides a high entropy oxide of formula (FeNiCrMnMgCu)O including spinel structure, and the spinel structure includes oxygen vacancy (OV) concentration of 20 to 40%. The present disclosure further provides a photodetector, which includes a substrate, an absorbing layer comprising the high entropy oxide, and an electrode unit. With the plenty of oxygen vacancies, the high entropy oxide shows the excellent optical absorption properties, thereby having a bright prospect of the application.

The invention discloses a preparation method of an electric furnace lining gunning material and a gunning device thereof, and the preparation method comprises the following steps: 1, uniformly mixing fly ash and titanium-containing powder, and heating to a first temperature to obtain an initial material; 2, the initial material is subjected to heat preservation at the first temperature for 1.5-2.5 h and then naturally cooled to the room temperature, and a first material is obtained; and step 3, crushing the first material and preparing the first material into slurry to form the gunning material. According to the preparation method of the electric furnace lining gunning material and the gunning device of the electric furnace lining gunning material, the fly ash and the titanium-containing powder react at a high temperature to obtain TiC, magnesium aluminate spinel and perovskite, the three high-melting-point solid-phase substances have the characteristics of high corrosion resistance, high viscosity and the like at the same time, the three high-melting-point solid-phase substances are gunned to the damaged part of the furnace lining, and the damage to the damaged part of the furnace lining is avoided. The direct contact between the slag and the furnace lining can be effectively prevented, and the further melting loss and scouring consumption speed of the slag to the furnace lining is reduced, so that the service life of the furnace lining is prolonged.

A spinel-structured multi-component composite oxide catalyst comprises active metals and base metals, and the active metals are 2-5 of iron, cobalt, nickel, ruthenium, molybdenum, manganese, platinum, palladium and chromium; the base metal is a composite metal oxide formed by two or three mixed metals of magnesium, aluminum, zinc, manganese, iron, cobalt, titanium, chromium and nickel; the particle size of the active metal particles is 2-50 nanometers, more preferably 2-20 nanometers. The catalyst has the characteristics of high transition metal content, uniform active site distribution, small crystal grain, large specific surface area, sintering inhibition, good stability and the like, and high-magnification synthesis of carbon nanotube powder is realized by cracking hydrocarbon carbon source gas.

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 belongs to the technical field of refractory materials, and discloses an aluminothermic reaction sintered alumina hollow sphere heat-insulating refractory material and a preparation method thereof. The aluminothermic reaction sintered aluminum oxide hollow sphere heat-insulating refractory material comprises the following raw materials in percentage by mass: 20-30% of aluminum oxide hollow spheres with the particle size of 3-5mm, 10-20% of aluminum oxide hollow spheres with the particle size of 1-3mm, 5-15% of aluminum oxide hollow spheres with the particle size of 0.1-1mm, 2-10% of light-burned magnesia, 20-30% of activated aluminum oxide powder, 15-25% of magnesium peroxide powder and 4-7% of metal aluminum powder, a binding agent accounting for 2-4% of the total mass of the raw materials is added. According to the refractory material, aluminum and magnesium peroxide are subjected to aluminothermic reaction and self-reaction sintering, a continuous spinel structure is formed on the surfaces of the matrix and the aluminum oxide hollow spheres, high strength is achieved through sintering at low temperature, and low thermal conductivity and high thermal shock stability are both considered.

The invention provides nano magnesium aluminate spinel with high sintering activity and high dispersity and a preparation method thereof, and belongs to the field of nano material preparation. The method comprises the following steps: mixing aluminum chloride, magnesium chloride and deionized water to obtain a mixed solution; adding aluminum bicarbonate into the mixed solution, and carrying out hydrothermal reaction, so that aluminum hydroxide and magnesium hydroxide are precipitated at the same time to obtain a magnesium aluminate spinel precursor; the magnesium aluminate spinel precursor is subjected to first-stage roasting, so that the magnesium aluminate spinel precursor is subjected to flash pyrolysis to form a fine crystal nucleus, and a pyrolysis product is obtained; and performing second-stage roasting on the pyrolysis product to control the crystal nucleus of the pyrolysis product to grow along a specific crystal face, thereby obtaining the nano magnesium aluminate spinel powder. A nanoscale precursor is precisely regulated and controlled to be controllably and orderly separated out through a wet-process system micro-area reaction; the crystal form development, the microstructure and the size uniformity of the powder are controlled through a flash pyrolysis nucleation-crystal face oriented growth two-stage roasting technology.

The invention belongs to the technical field of inorganic nano materials and electro-catalysis, and particularly relates to a cobalt-based spinel oxide nano material as well as a preparation method and application thereof. The cobalt-based spinel oxide nano material comprises a conductive substrate and cobalt-based spinel oxide grown on the surface of the conductive substrate, the molecular formula of the cobalt-based spinel oxide is MxCo1-xO4, and M is transition metal or P-region metal and is selected from one or more of titanium, vanadium, chromium, manganese, iron, nickel, aluminum, cerium and neodymium. Multiple metal elements are doped into a cobaltosic oxide lattice, and the intrinsic structure of spinel is not changed by metal doping. Multiple metal elements are highly uniformly dispersed in the material, so that active sites are comprehensively regulated and controlled, the material shows excellent thermodynamic and chemical stability under harsh conditions of high temperature, large current, concentrated alkali and the like, is suitable for various electrolysis modes, has no metal dissolution risk in long-term operation, can effectively avoid the problems of membrane poisoning and membrane degradation, and has good application prospects. Wide application prospects are shown.

The invention provides a high-entropy oxide material and a preparation method and application thereof, and relates to the technical field of supercapacitor materials. The high-entropy oxide material is prepared by taking nitrates corresponding to Cr, Fe, Co and Ni and ammonium paramolybdate as raw materials through a simple solution synthesis method, is of a spinel structure and has a space group of Fd-3m. According to the preparation method provided by the invention, the specific surface area of the material can be increased by utilizing the high-entropy effect of various metal elements by regulating and controlling the proportion and synthesis conditions of all the metal elements, and the prepared high-entropy oxide can still keep the structural stability and electrochemical activity under high temperature or extreme electrochemical conditions, is not easy to generate phase separation or degradation, and has a good application prospect. Therefore, the durability and the service life of the material are remarkably improved. The high-entropy oxide material prepared by the method shows excellent pseudocapacitance behavior in electrochemical energy storage, and provides an efficient and economical material choice for energy storage.

The invention belongs to the technical field of optical ceramics and functional ceramic materials, and discloses a spinel ceramic material with high-temperature extinction and broadband high emissivity as well as a preparation method and application thereof. The chemical formula of the material is Cu (0.7-x) Ni (x) Cr (1.5) Mn (0.8-y) MyO4, M is Co and Fe, x is more than or equal to 0 and less than or equal to 0.5, y is more than or equal to 0 and less than or equal to 0.5, and different-valence or variable-valence metal elements (Ni, Co and Fe) and Mn are co-doped with copper-chromium spinel. The spectral emissivity of the ceramic material in the infrared band of 2.5-25 microns is gt; the emissivity spectrum curve is flat, the material has the characteristics of wide band, high emissivity and the like, and the emissivity of a coating prepared from the material is the spectral emissivity gt of the infrared band of 2.5-25 microns; and 0.95, the method has good application prospects in the fields of aerospace thermal control, aerospace craft thermal protection, industrial kiln energy saving, high-temperature extinction black bodies, optical camera extinction coatings and the like.

The invention discloses a melt separation titanium slag modification treatment method and system. The method comprises the steps that in the direct reduction-melt separation process, melt separation titanium slag components are regulated and controlled to enable the melt separation titanium slag to contain 40 wt%-60 wt% of TiO2 and 1.1 wt%-9 wt% of C, deslagging is conducted, after heat preservation melting is conducted on the melt separation titanium slag at the temperature of 1550-1600 DEG C for 30-60 minutes, slow cooling is conducted to 1200 DEG C at the cooling rate of 5-10 DEG C / min, then rapid cooling is conducted to 900 DEG C at the cooling rate of 20 DEG C / min or above, finally natural cooling is conducted to the room temperature, and modified slag is obtained. According to the method, regulation and control of components of the melt-separated titanium slag are combined with heat preservation, slow cooling, quenching and natural cooling, anosovite is directionally induced to serve as a main phase of the titanium slag, micronized spinel and an amorphous glass phase, titanium resources are enriched in the anosovite phase, and the modified titanium slag high in grade and good in activity is obtained; and the problems of low additional value, small utilization scale, poor economic benefit and the like of molten titanium slag products are solved.

The invention relates to the technical field of adsorbent materials, and discloses a CoMn2O4 spinel adsorbent and a method for removing trivalent antimony in a water body by using the CoMn2O4 spinel adsorbent. The adsorbent is prepared by adopting a co-precipitation and low-temperature thermally induced crystallization synergetic green process: dissolving cobalt salt and manganese salt according to a stoichiometric ratio, dropwise adding a sodium hydroxide solution for co-precipitation, washing an obtained precursor, and drying at 80-120 DEG C under normal pressure for 12-48 hours to directly obtain the adsorbent. According to the method, the spinel material with low crystallinity, high specific surface area and rich surface hydroxyl is controllably synthesized by regulating and controlling the concentration of the precipitator and the drying condition, and the problems of active site loss and high energy consumption caused by traditional high-temperature calcination are avoided. When the composite material is used for treating wastewater containing trivalent antimony, antimony ions can be efficiently removed through the adsorption effect under the appropriate pH condition, excellent adsorption capacity is shown, the technology is simple, cost is low, safety is good, and an efficient and stable adsorption material and a feasible method are provided for water body antimony pollution treatment.

The present invention provides a sintered body having a high Curie point and exhibiting high magnetic permeability in a high frequency region. The sintered body comprises a spinel-type ferrite oxide having a main component of a metal element being Fe, Ni, Cu, and Zn, and further comprises Zr, Mn, Al, Co, and Cr, and when the molar fractions of Zn, Ni, Cu, Zr, Mn, Al, Co, and Cr, with Fe being 100 mol, are respectively set as a, b, c, d, e, f, g, and h, 100-a-b-c+2d+(1 / 2)e, a+b+c+d+e / 2, f, g, and h respectively satisfy the following formulas (1) to (5). 49.0 < 100-a-b-c+2d+(1 / 2)e < 50.0 (1) 50.2 < a+b+c+d+e / 2 < 52.7 (2) 0.0012 ≤ f ≤ 0.010 (3) 0.0005 ≤ g ≤ 0.0015 (4) 0.0005 ≤ h ≤ 0.004 (5).

The application discloses a kind of steel material for nuclear reactor and its preparation method and application.The steel material includes stainless steel matrix and the oxidation layer coated on the surface of the stainless steel matrix;The oxidation layer includes first oxidation layer and second oxidation layer;The first oxidation layer includes the mixed layer with spinel type crystal structure and corundum type crystal structure;The second oxidation layer includes corundum type crystal structure;The second oxidation layer is between the first oxidation layer and the stainless steel matrix.The steel material in the application is provided with oxidation layer on the stainless steel matrix, the oxidation layer contains spinel type crystal structure and corundum type crystal structure, the two kinds of crystal structure are uniform, continuous and dense, thereby blocking liquid lead bismuth from penetrating into crystal structure, so that the steel material has excellent lead bismuth corrosion resistance.In addition, the oxidation layer in the application has high bonding strength with the stainless steel matrix, and the bonding strength can reach more than 80MPa.

A high-power, high-temperature-stability M-type strontium ferrite belongs to the field of ferrite material preparation technology. The ferrite comprises a main formulation of SrCO3, La2O3, CaCO3, MnO, SnO2, Fe2O3, and Co2O3, and additives composed of CaCO3, SiO2, H3BO3, and La2O3. This invention introduces Sn-Mn ions for co-substitution, thereby constructing a Sn... 4+ -Mn 2+ The charge balance mechanism effectively suppressed the Fe ionization induced by the introduction of high-valence ions. 3+ To Fe 2+ Price change behavior, effective compensation after replacement due to the introduction of non-magnetic Sn 4+ This results in a loss of lattice magnetic moment. Simultaneously, through a stepped pre-sintering and sintering process, a CoFe2O4 hard magnetic spinel phase is induced to precipitate in the M-type strontium ferrite main phase. The negative coercivity temperature coefficient of the CoFe2O4 phase complements the inherent positive temperature coefficient of the matrix.

The invention discloses a manganese-doped aluminum-rich magnesium aluminate spinel transparent ceramic phosphor which is of a single-phase magnesium aluminate spinel structure, and the stoichiometric formula is Mg (1-x-y) Al (2 + 2x) / 3O4: yMn, x is greater than or equal to 0.004 and less than or equal to 0.1; the preparation method comprises the following steps: firstly, preparing Mg1-x-yAl2 + 2x / 3O4: yMn single-phase ceramic powder by adopting a high-temperature solid-phase reaction, and then carrying out dry-pressing molding, pressureless pre-sintering and hot isostatic pressing treatment to obtain the high-temperature-resistant magnesium alloy. The transparent ceramic phosphor is of a block structure and has the advantages of being high in optical quality, narrow in half-peak width emission, high in thermal stability, high in thermal conductivity and the like. The high-power white-light LED packaging material can effectively replace a traditional mode of packaging powder through organic glue, is beneficial to solving the problems of heat dissipation and light efficiency conversion, is expected to improve the stability of an LED device, solves the problems of fluorescence performance reduction and the like caused by aging of plastic packaging glue in the using process of a high-power white-light LED, and is suitable for popularization and application.

The invention belongs to the technical field of high-temperature protective coatings, and particularly relates to an interface stable type metal bonding layer for a thermal barrier coating based on phase structure regulation and control and a preparation method of the interface stable type metal bonding layer. The main components of the metal bonding layer are Ni, Cr and Al, the aluminum content is 8-12 wt.%, the chromium content is 5-15 wt.%, the phase composition is gamma'single phase or gamma ' / gamma double phase, and no alpha-Cr or beta-NiAl phase is separated out. Through precise regulation and control of components and phase composition, preferential oxidation of a heterogeneous interface is inhibited, and the chemical potential difference between a coating and a substrate is reduced. In long-term high-temperature service, a single protective Al2O3 film is generated on the surface, no harmful brittle spinel oxide is generated, a strong bonding mixing area is formed between an oxide layer and a ceramic layer interface, and no obvious element mutual diffusion exists between the coating and a matrix. The method is simple in process, suitable for various high-temperature alloys and capable of being widely applied to high-temperature corrosion protection of hot-end components such as aero-engines and gas turbines, and the service life of the thermal barrier coating is remarkably prolonged.

The application belongs to the technical field of refractory materials, and relates to a multi-metal composite magnesium-alumina spinel-containing refractory material and a preparation method thereof. The material of the magnesium-alumina spinel-containing refractory material is one of SiC-MgAl2O4, Al2O3-MgAl2O4 and MgO-MgAl2O4; the main body of components of the magnesium-alumina spinel-containing refractory material is granular SiC, Al2O3 and MgO as aggregate and a mixture of fine powder and micro powder composed of MgAl2O4 as matrix, and the components contain metal Al and Al-Mg alloy; the magnesium-alumina spinel-containing refractory material is prepared through hot air drying at 150-200 DEG C for 8-24 hours, and high-temperature sintering is not needed; the magnesium-alumina spinel-containing refractory material is a composite refractory material with alpha-SiC or corundum or periclase as main crystal phase and magnesium-alumina spinel as secondary crystal phase. The application realizes that the formed green body only needs to be treated at low temperature not higher than 200 DEG C, and can meet good mechanical properties, structural stability and corrosion resistance in a use temperature range of 25-1600 DEG C, and the built-in hot work thermal reserve can realize high mechanical strength and volume stability from normal temperature to the highest use environment through the waste heat in the oven heating process.

Materials include phase transition disordered rock salts having an ordered arrangement of partially disordered spinel cations to provide suitable constant current cycling behavior. The phase transition disordered rock salt has the chemical formula LixMnyTMzO2-uFu, where 0.9 < = x < = 1.3, 0 < = y < = 1, 0 < = z < = 0.5, and 0 < = u < = 0.5, and TM is Al, Ti, V, Cr, Mn, Fe, Co, Ni, Zr, Nb, Mo, Sn, W, or a mixture thereof. Further, the phase transition disordered rock salt includes a first set of domains and a second set of domains interspersed between the first set of domains. The second set of domains is separated from the first set of domains by one or more anti-phase domain boundaries. Methods and systems are described in the present disclosure.

A method for producing a porous ceramic structure, comprising the following: a) Making kneaded clay by kneading a raw material; b) Obtaining a pressed body by shaping the kneaded clay and c) Firing of the pressed body, wherein the raw material contains the following: Cordierite; Cer and iron and / or manganese and / or cobalt, wherein the process c) forms a porous ceramic structure comprising a porous structural body formed essentially of cordierite, cerium-containing particles firmly attached to the structural body, and metal oxide particles each firmly attached to an inside of a pore in the structural body, wherein the metal oxide particles are particles of an oxide having a spinel structure containing iron and / or manganese and / or cobalt, The process c) includes the following: c1) Raising the temperature of the pressed body to a first temperature that is less than or equal to a liquid phase formation temperature; c2) Increasing the temperature of the pressed body from the first temperature to a second temperature that is higher than the liquid phase formation temperature and lower than a crystallization temperature of the metal oxide particles; c3) Increasing the temperature of the pressed body from the second temperature to a third temperature which is greater than the crystallization temperature and less than or equal to a maximum temperature; and c4) Maintaining the temperature of the press body at the maximum temperature for a specified period of time, and wherein a rate of temperature increase in process c2) in the range of 100 °C / h to 200 °C / h.

An order-to-disorder transformed spinel phase lithium nickel manganese oxide material, a preparation method therefor and a use thereof. A matrix of the spinel phase lithium nickel manganese oxide material is primarily based on an ordered spinel phase, but the surface of the matrix is a surface layer primarily based on a disordered spinel phase. Moreover, there is also a doping element for increasing the degree of disorder and / or promoting single crystallization in the matrix. By introducing the doping element, the content of trivalent manganese in the matrix is increased, so that the internal degree of disorder is increased on the basis of the ordered spinel phase; moreover, single crystal particles of the order-to-disorder transformed spinel phase lithium nickel manganese oxide material are at the micron level, and said material has a small specific surface area and excellent capacity. The surface layer primarily based on the disordered spinel phase can further improve the capacity, cycle performance and rate capability of the order-to-disorder transformed spinel phase lithium nickel manganese oxide material, so that said material has great advantages in subsequent material coating. The order-to-disorder transformed spinel phase lithium nickel manganese oxide material can be widely used in preparation of lithium battery positive electrodes.

The invention discloses a lithium-rich manganese-based positive electrode material with an in-situ spinel phase and a preparation method of the lithium-rich manganese-based positive electrode material, and belongs to the technical field of synthesis of lithium-rich manganese-based materials, the material has a layered-spinel integrated structure generated in situ in a layered structure matrix, and the spinel phase is uniformly distributed in a layered lattice and forms a coherent interface with a layered phase; the molar ratio of Mn < 3 + > to Mn < 4 + > in the material is 0.05-0.20; the D50 particle size of the material is 2-10 [mu] m, and the particles are spherical or sphere-like. According to the method, the uniformly distributed spinel phase can be generated in situ in the layered matrix, and a coherent interface is formed, so that the dynamic performance and the rate capability are remarkably improved.

The present application provides a positive electrode active material, a preparation method therefor and the use thereof. The positive electrode active material may comprise a spinel lithium nickel manganese oxide material, wherein the spinel lithium nickel manganese oxide material has the following chemical formula: LiaNi0.5−xMn1.5−yMx+yO4, wherein M is selected from at least one of Mg, Zn, Ti, Zr, W, Nb, Al, B, P, Mo, V, or Cr, 0.9≤a≤1.1, −0.2≤x≤0.2, −0.02≤y≤0.3, and x+y≥0; the Mn3+ content in the spinel lithium nickel manganese oxide material may be less than or equal to 0.7 wt %.

An alkali metal-containing oxide of the present disclosure has a spinel structure and a composition represented by the following formula (1). In an X-ray diffraction chart measured at 25° C. using a CuKα ray, a peak having a half width of 0.5° to 5° is observed within a range of 40° to 45°.(In the formula (1), 1.1<x≤2.8, 0.8≤a<1.9, 0.05<b≤0.6, 1.0≤a+b<2.0, 0≤c<0.2, 0≤d<1.0, 0≤e<1.0,A is an alkali metal element, M′ is at least one element from Ti, Cr, Mn, Fe, Co, Ni and Cu, M″ is at least one from Si, P, S, Ge and V, Z is an element of Group II to Group XVI except oxygen, M′ and M″, and X is a halogen element.)

This invention provides a spinel glass-ceramic and its preparation method. The glass-ceramic comprises crystal group 1 and crystal group 2, wherein crystal group 1 comprises crystals having the following structural formula: (Zn x Mg 1‑x‑ y Al 2‑2y (Al) 2y Mg y O4, wherein: 0≤x≤1; 0≤y≤1; and 0≤x+y≤1; the crystal group 2 includes zirconium oxide; the microcrystalline glass is transparent in the visible light range. The total crystallinity of the spinel microcrystalline glass of the present invention is at least 53wt%, and the elastic modulus is above 105GPa. The chemically strengthened microcrystalline glass obtained by chemical strengthening of the spinel microcrystalline glass of the present invention through ion exchange has excellent mechanical properties and impact resistance.