202results about How to "Inhibition of phase transition" patented technology

The invention relates to a method for preparing a lithium ion battery anode material doped with a nanometer oxide, belonging to the technical field of manufacturing processes of lithium ion battery batteries. The method is characterized in that trace amount of nanometer oxide power is doped in the preparation process of lithium manganate, lithium cobaltoxide and lithium iron phosphate; the doping amount is 0.5-1.0 mol percent of lithium salts; and the nanometer oxide is selected from one or two of alumina, magnesia, titanium oxide, chromic oxide, nickel oxide, monox and zirconia and the nanometer oxide is subject to ball milling, drying, sieving, calcinating, crushing, grading and other processes to obtain the nanometer oxide doped or coated lithium ion battery anode material. The lithium ion battery anode material has reversible initial capacitance, and remarkably-improved attenuation property, charging-discharging properties, high-temperature circulating property and electrochemistry stability.

The invention discloses a preparation method of a lithium-enriched magnesium-based anode material of a lithium ion battery. The preparation method comprises the steps of: depositing cobalt manganese oxide by using an electrodeposition method, and dissolving the cobalt manganese oxide and lithium chloride in a mixed way to obtain lithium cobalt manganese oxide powder; dissolving the lithium cobalt manganese oxide powder and the lithium chloride in a mixed way and heating to obtain lithium-enriched lithium cobalt manganese oxide powder; adding the lithium-enriched lithium cobalt manganese oxide powder into an aqueous solution of aluminum chloride, and standing to obtain aluminum-hydroxide-cladded aluminum-enriched lithium cobalt manganese oxide; sintering to obtain an alumina-cladded lithium-enriched lithium cobalt manganese oxide material; and preparing the anode material. According to the invention, by adoption the alumina-cladded lithium cobalt manganese oxide material as an anode active substance, while higher energy density is achieved, phase change of the anode material and the dissolution loss of important metal are inhibited, and the anode material has good cyclic stability, and is high in specific capacity, good cyclic performance and long service life when applied to the lithium ion battery.

The present invention provides a high-voltage lithium cobaltate positive electrode material, which is a compound structure of a doped lithium cobaltate substrate and a surface coating layer, wherein the general formula of the doped lithium cobaltate substrate is Li1+zCo1-x-yMaxMbyO2, x is more than or equal to 0 and is less than or equal to 0.01, y is more than or equal to 0 and is less than or equal to 0.01, z is more than or equal to -0.05 and is less than or equal to 0.08, Ma is a doped element with unchanged valence, and is at least one selected from Al, Ga, Hf, Mg, Sn, Zn and Zr, Mb is adoped valence-changing element, and is at least one selected from Ni, Mn, V, Mo, Nb, Cu, Fe, In, W and Cr, and the surface coating layer is a high-voltage (more than 4.5 V) positive electrode material. According to the present invention, the element with unchanged valence is doped through substitution, such that the layered structure distortion caused by lithium removing can be minimized; the valence-changing element is subjected to gap doping, such that the Co<3+> oxidation is blended and delayed during the charging; and the surface coating layer has the stable structure at the voltage of more than 4.5 V, can separate the electrolytic solution from the lithium cobaltate substrate, can reduce the side reaction between the electrolytic solution and the lithium cobaltate substrate, can suppress the dissolution of the transition metal, and further can provide electrochemical energy.

This invention provides a method for preparing spherical Al2O3 with high hydrothermal stability. Based on the mechanisms of Al2O3 sintering and phase change, the method introduces phosphate ions, which can react with OH groups on the pore walls to reduce the quantity of OH groups and change the surface acidity of Al2O3. The method can prevent the sintering and phase change of Al2O3 pore channels, thus can improve the hydrothermal stability of spherical Al2O3 carrier. The hydrothermal stability of modified spherical Al2O3 is much higher than that of unmodified spherical Al2O3. The specific surface area of modified spherical Al2O3 is 190-200 m2/g, the pore volume is 0.85-1.25 mL/g, the particle diameters are 0.5-5 mm, the packing density is 0.3-0.55 g/cm3, and the weight content of P2O5 is 0.5-5%. The spherical Al2O3 can be used as catalyst or catalyst carrier for petrochemicals and fine chemicals.

The invention provides a selective catalytic reduction (SCR) catalyst and a preparation method thereof. The SCR catalyst comprises a TiO2-SiO2 composite oxide carrier, a metal oxide solid acid, V2O5 and CeO2. Compared with the existing SCR catalyst, the SCR catalyst has the advantages that SiO2 is added, so phase change of TiO2 at high temperature can be inhibited and the heat stability of the catalyst is enhanced; the SiO2 has more specific surface area than that of the TiO2, so the specific surface area of the catalyst can be increased, active components are dispersed well, and the activity of the catalyst is further improved through the interaction of the metal and the carrier; the SiO2 has excellent heat stability, so the using temperature window of the SCR catalyst can be widened by inhibiting the phase change of the carrier at high temperature and inhibiting reduction of the specific surface area; and the active components such as the CeO2 are added, so the catalytic activity of the catalyst at a lower temperature can be improved by enhancing the oxidizing capacity at a low temperature.

The invention provides a tailored blank laser welding method for hot-formed steel with Al-Si plating. The method comprises steps as follows: tailored welding is performed on a hot-formed steel plate with the Al-Si plating under the condition of shielding gas by laser welding equipment; and the shielding gas includes mixed gas of one or two of oxygen and carbon dioxide and inert gas. In the tailored welding process, the mixed gas of one or two of the oxygen and the carbon dioxide and the inert gas is used as the shielding gas, the oxygen partial pressure in a welding pool is increased, Al and O elements entering the welding pool are combined to form Al2O3 which does not affect the strength and toughness of a weld joint, Al and Fe elements are inhibited from forming an intermetallic compound and affecting austenitic phase transformation, a weld joint zone with the all slat martensitic structure is obtained finally, and the strength of the weld joint reaches the level of base metal. With the method, welding wires are not required to be added, plating removal before welding is also not required, the method is simple, the production efficiency is improved, and the production cost is reduced.

The present invention discloses a Li2MnO3 and LiCoO2 composite anode material, which is a Li2MnO3 and LiCoO2 composite oxide meeting a stoichiometric ratio of xLi2MnO3.yLiCoO2, wherein x is more than or equal to 0.025 and is less than or equal to 0.15, and x plus y equals 1. The Li2MnO3 and LiCoO2 composite anode material of the present invention has characteristics of high specific capacity and high cycle life, and further has excellent performances under conditions of high rate, high temperature, low temperature, and the like.

A reactor for supercritical water oxidation comprises an essentially vertical reactor section (11) and an essentially non-vertical reactor section (12), wherein the vertical reactor section has a cross-sectional area which is substantially larger than the cross-sectional area of the non-vertical reactor section. The vertical reactor section has an inlet (14) in an upper portion thereof for receiving (17) a flow containing organic material and water, and an outlet (16) in a lower portion thereof for outputting (20) the flow. Both the vertical and the non-vertical reactor sections are configured to oxidize organic material in the flow through supercritical water oxidation.

A liquid crystal display device (LCD) and method of fabricating the same are provided, in which in an OCB mode LCD, an edge portion of a first electrode is formed with a taper angle of not less than approximately 25° and less than 90°, thus an electric field in the edge portion of the first electrode becomes nonuniform so that a transitional nucleus is easily created and liquid crystals are readily transitioned to a bend phase at a low transition voltage. As a result, the phase transition of the liquid crystals can be easily controlled.

The invention provides an ion conductor and heterostructure co-modified lithium ion battery positive electrode material and a preparation method and application thereof. The modified lithium ion battery positive electrode material is coated by an ion conductor and is co-acted with a heterostructure; the modified lithium ion battery positive electrode material comprises an ion conductor coating layer, a heterostructure layer and a material body, the ion conductor coating layer is formed by reaction of a polyanionic compound, doped element salt and residual lithium on the surface of the material, and the phase of the heterostructure layer is a spinel phase or/and a rock salt phase and is located between the coating layer and the material body. The preparation method comprises the following steps of uniformly mixing lithium ion battery positive electrode material powder with polyanionic salt, doped element salt, weak acid and other compounds in a solution, drying by distillation, and sintering to obtain the product. The product obtained by the invention is used in energy storage equipment.

The invention discloses a diesel vehicle exhaust purification SCR (Selective Catalytic Reduction) catalyst. The catalyst comprises a cordierite honeycomb ceramic carrier and a coating which is loaded on the cordierite honeycomb ceramic carrier; the coating comprises the following raw materials: titanium dioxide/silicon dioxide composite oxide powder, ammonium tungstate and ammonium metavanadate according to a mass ratio of 100:(12-18):(3-6). A preparation method of the catalyst comprises the steps of mixing the ammonium tungstate with the titanium dioxide/silicon dioxide composite oxide powder firstly to prepare TiO2-SiO2/WO3 pccowder, then mixing the ammonium metavanadate with TiO2-SiO2/WO3 to prepare slurry to be coated, and then coating the cordierite honeycomb ceramic carrier with the slurry to be coated by using an impregnation method. The catalyst is wide in activity temperature window, high in high-temperature activity and water/heat resistant stability, and good in reproducibility.

The invention relates to a polycrystalline ternary positive electrode material as well as a preparation method and application thereof. The polycrystalline ternary positive electrode material comprises secondary particles formed by stacking single crystal primary particles, wherein the single crystal primary particles are in contact with one another to form grain boundaries, and boron elements aredistributed in the grain boundaries. A high-strength B-O-Ni chemical bond is formed between the boron element and the nickel element, so that the acting force between the single crystal primary particles is relatively strong, the contact damage caused by anisotropic volume change between the single crystal primary particles is relieved, and the structural stability is good. The polycrystalline ternary positive electrode material, especially the polycrystalline high-nickel ternary positive electrode material, can slow down the cracking phenomenon in the use process, and has excellent cycle performance.

The invention provides a lithium cobalt oxide material and a preparation method thereof as well as an anode material. The lithium cobalt oxide material is mainly prepared from an element M doped lithium cobalt oxide particle and a coating which coats the surface of the lithium cobalt oxide particle; the molecular formula of the lithium cobalt oxide particle is LiaCo1-bMbO2, wherein a is not less than 0.95 but not more than 1.15; b is not less than 0.003 but not more than 0.01; M is at least one or several of Mg, Al, Ti, Zr, Ni, Mn, Cr, Mo, W and a rare earth element; the coating is selected from one or a mixture of ZnO and SnO2, and has a weight which is 0.5wt% to 5 wt%, preferably 1wt% to 5wt%, preferably 2wt% to 5wt% and preferably 2wt% to 4wt%, of that of the lithium cobalt oxide particle. By using the lithium cobalt oxide material, the problems that the rate capability and the cycle performance of an existing material are poor under high pressure are solved.

The invention discloses a lithium ion battery electrolyte suitable for a NCM811 and SiO-C material system and a preparation method. In the electrolyte of the present invention, an organic solvent composed of ethyl methyl carbonate, diethyl carbonate, and ethylene carbonate, a lithium salt composed of lithium hexafluorophosphate and lithium difluorophosphate, and an additive composed of vinylene carbonate, fluoroethylene carbonate, ethylene sulfate, and 1,3-propane sultone are compounded in a certain proportion, and cooperate to react, during a lithium ion battery cycle, on the surface of NCM811 and SiO-C and form a stable solid electrolyte protective film to prevent direct contact between the electrolyte and NCM811 and SiO, thereby reducing the side reactions between the electrode and theelectrolyte, and reducing the phase transition and volume change of the material, and further improving the cycling performance of the lithium ion battery. Experimental results show that by using theelectrolyte of the present invention, the lithium ions of the NCM811 and SiO-C material system has a capacity retention rate of more than 90% after 500 cycles of 1C/1C at room temperature, and has excellent cycle performance.

The invention discloses a method for preparing a Mo-ZrO2 metal ceramic electrode by utilizing a sol-gel method. The method comprises the following steps: utilizing ammonium molybdate, zirconium nitrate, citric acid and nitric acid or ammonia water to adjust pH value; preparing a sol in 80-90 DEG C water bath; realizing the conversion from sol to gel after aging for a period of time; placing the gel into a vacuum drying oven and drying for 3-4h, wherein the drying temperature is above 100 DEG C, but cannot be too high and generally is within a scope of 110-130 DEG C; firing the dry gel in a muffle furnace, thereby forming a mixture of molybdenum oxide and zirconium oxide; reducing for 2-3 hours in a hydrogen furnace respectively at 560-580 DEG C and at 960-980 DEG C; cold-pressing and molding the reduced molybdenum and zirconium oxide compound material under a pressure; and firing and forming in an inert gas shielding furnace. According to the method, the molybdenum and the zirconium oxide are more uniformly mixed, a netted structure formed by the metal molybdenum is benefited and the conductivity is further promoted.

The invention belongs to the technical field of lithium ion battery anode materials, and discloses a surface-modified lithium-rich layered transition metal oxide as well as a preparation method and application thereof. The surface-modified lithium-rich layered transition metal oxide is prepared by the following steps that: a transition metal compound precursor, a lithium source and molten salt aremixed, and an obtained mixture is heated to 780-980 DEG C, is cooled to room temperature, cleaning, filtering and drying are performed, so that a lithium-rich layered transition metal oxide can be obtained; and the lithium-rich layered transition metal oxide is uniformly mixed with a carbon-nitrogen source, the mixture is placed in a protective atmosphere so as to be subjected to a hydrothermal reaction at 130-230 DEG C, an obtained product naturally cools, water washing, suction filtration, and drying are performed, so that the surface-modified lithium-rich layered transition metal oxide canbe obtained. The structure of the surface-modified lithium-rich layered transition metal oxide sequentially comprises the lithium-rich layered transition metal oxide, an oxygen vacancy-rich lithium-rich layered transition metal oxide-spinel structure oxide symbiotic layer and a nitrogen-doped carbon nano layer. The surface-modified lithium-rich layered transition metal oxide shows relatively highspecific discharge capacity and cycling stability as an anode material.

Compositions and methods for of their use in treating human or other mammalian skin and hair. Non-ionic, salt-free non-solidifying formulations of Lauroyl N methyl-C₁₀, C₁₂, C₁₄, C₁₆ alkanoyl-N-methyl-glucamide and alkyl glycosides are disclosed that impart beneficial barrier properties to skin and hair.

The invention relates to a lithium-rich manganese-based cathode material coated with a composite carbon material derived from a COFs material containing at least one element of N and B, and a preparation method thereof, and a lithium battery, wherein the surface of the lithium-rich manganese-based cathode material is coated with a composite carbon material. The lithium-rich manganese-based cathodematerial coated with the composite carbon material can obviously improve the conductivity of the material and the rate performance and cycle performance of the battery containing the composite carbonmaterial, and the composite carbon material is coated more uniformly. The invention adopts a simple one-step carbonization method to prepare a composite porous carbon material coated with a lithium-rich manganese-based cathode material, the prepared porous carbon has controllable specific surface area and pore size, and the preparation method is simple and efficient, and is suitable for large-scale preparation and synthesis.

The invention discloses a doped high-nickel high-voltage NCM positive electrode material and a preparation method thereof, and belongs to the field of lithium ion batteries. The preparation method comprises the following steps: simultaneously doping manganese and cobalt to obtain an NCM precursor; and adding a dopant M into the precursor, and sintering the precursor in a high-pressure oxygen atmosphere to obtain a lithium ion battery positive electrode material. The positive electrode material has very high specific discharge capacity and excellent cycling stability, can meet the high-rate charging and discharging requirement, and can achieve long-life safe cycling under high voltage. The positive electrode material is prepared by combining four-solution parallel-flow co-precipitation witha high-pressure solid-phase synthesis method, and the prepared product has the advantages of high purity, high crystallization quality, high particle density, uniform distribution of particles, excellent electrochemical performance and low manufacturing cost, is an ideal positive electrode material with high energy density, and has a wide application prospect.

Catalyst support particles and a catalyzer are produced by using γ-alumina particles or alumina precursor particles treated in advance by hydrothermal treatment in an autoclave. Performing the hydrothermal treatment improves the thermal resistance of the alumina particles because of suppressing deformation of the alumina particles when used at a high temperature such as 1000° C.

The invention provides a three-dimensional porous graphene-vanadium disulfide composite electrode material, and a preparation method and an application thereof. The composite electrode material comprises porous graphene oxide and vanadium disulfide coated with porous graphene oxide. The composite electrode material adopts porous graphene oxide for coating vanadium disulfide, and porous graphene oxide provides more ionic channels and larger specific surface area, so that ion storage and transportation can be performed conveniently; by virtue of porous graphene oxide, electrical conductivity ofvanadium disulfide can be improved, so that the problems of volume expansion and phase change of vanadium disulfide in the charging-discharging processes can be suppressed; meanwhile, vanadium disulfide can provide pseudocapacitance, so that relatively high specific capacity and rate performance can be realized; the composite electrode material shows high capacitance characteristic in a supercapacitor; and by virtue of the three-dimensional macro body of the composite electrode material, stability of the composite material can be obviously reinforced.