34results about How to "Does not destroy the crystal structure" patented technology

The invention discloses a lithium ion battery high-nickel ternary positive electrode material, which has a chemical general formula of LiNixM1-xO2, wherein x is more than or equal to 0.5 and is less than 1, M is one or a variety of materials selected from Co, Mn and Al, the surface of the ithium ion battery high-nickel ternary positive electrode material is coated with a lithium salt coating layer, and the lithium salt is a lithium salt containing a -COOLi functional group. Compared to the material in the prior art, the material of the present invention has the following characteristics that the residual lithium on the surface of the high-nickel material is modified to form the stable lithium salt coating layer, such that the residual lithium on the surface can be removed, the protection layer can cover the surface of the material, the generation of lithium carbonate can be inhibited, and the crystal structure of the material cannot be destroyed. According to the present invention, thelithium ion battery high-nickel ternary positive electrode material has advantages of good cycle stability and good storage performance, and the preparation method is simple, easy-performing, economical and environmentally friendly, and has good application prospect. The invention further discloses a lithium ion battery.

A method for the treatment of bauxite flotation tailings relates to a method for making clay fire brick by means of bauxite flotation tailings and reclaiming the iron mineral in the tailings to make ferrous oxalate and ferric oxide. The method is characterized in that: firstly, the making process adopts oxalic acid leach bauxite cradling tailings iron mineral so as to remove iron; then, tailings is filtered and separated to make clay fire bricks. The method removes most impurity iron in the tailings at first so as to ensure that the content of ferric oxide in the tailings drops to less than 1.5 percent; meanwhile, only less than 1 percent of aluminum is leached out, and the crystal structure of the aluminum mineral in the tailings is not damaged basically; moreover, the flotation tailings with iron removed can be used to make qualified clay fire bricks.

The invention provides a preparation method of low-temperature cured nitride red phosphor paste, comprising the following steps: 1) mixing the nitrides, europium nitride and silicon nitride of metal M according to the atom number ratio of M:Eu:Si being (2-x):x:5, after uniform mixing, calcining the mixture in nitrogen atmosphere and ball-milling the calcined mixture to obtain phosphor, wherein x is more than 0 and not more than 1.0; 2) dissolving vinyl chloride-vinyl acetate resins or polyester resins in solvents, then heating the mixture at constant temperature until the mixture is completely dissolved and filtering the dissolved substances to obtain an organic carrier; and 3) adding the phosphor prepared in the step 1), thickening agents and dispersing agents to the organic carrier prepared in the step 2) and stirring the mixture uniformly, thus preparing the low-temperature cured nitride red phosphor paste. The preparation method has the advantages of simple and easily operated adopted equipment and capability of realizing preparation of paste of the low-temperature cured nitride red phosphor M(2-x)EuxSi5N8 (M=Ca, Sr or Ba).

The invention discloses a lithium-rich manganese-based/graphene composite cathode material, a preparation method thereof and an application thereof. The method comprises the steps of: preparing precursor powders by a coprecipitation method and by using a manganese source, a nickel source, a cobalt source, a complexing agent and a precipitating agent as raw materials; subjecting the obtained precursor powders and a lithium source to two-stage calcination to obtain a lithium-rich manganese-based cathode material; then subjecting the obtained lithium-rich manganese-based cathode material and a graphene dispersion to high-energy ball milling; and obtaining the lithium-rich manganese-based/graphene composite cathode material by drying. In the product prepared by the method, the graphene sheet can be well compounded between the surface of the lithium-rich manganese-based material particle surfaces and the particles, and form a more perfect conductive network around the particles. The cathodematerial improves the charging and discharging process and the electrical conductivity of the lithium ion battery under the premise of maintaining the structural stability, and has a simple process and good repeatability.

The invention discloses a method for filling a welding key hole by utilizing friction stir. The method comprises the following steps that (1) a stirring head is obliquely inserted into a machining allowance layer relative to a welding surface normal of a workpiece; (2) the end part of the stirring head located in the machining allowance layer is pushed to a key hole position in a machining allowance layer; (3) the stirring head is turned back, and the axis of the stirring head coincides with the center of the key hole; and (4) the stirring head is lifted, and the key hole filling is finished.According to the filling method, the characteristic that the friction heat can soften the workpiece material when the stirring head rotates in the workpiece is utilized, the softening machining allowance material on the surface of the workpiece is migrated to the key hole through the motion of rotating the stirring head, and the softened material fills the key hole through the combined motion of the rotating head.

The invention discloses a preparation method of a positive electrode material, a water-based zinc ion battery positive electrode and application. The preparation method comprises the following steps: dissolving soluble doped metal salt in water, and uniformly stirring; meanwhile, uniformly stirring with a V2O5 aqueous solution added with an H2O2 solution, carrying out heat preservation treatment on the stirred liquid, cooling to room temperature, and then centrifugally washing and drying; and mixing a dried solid with a conductive agent and a binder to form positive electrode slurry, coating the positive electrode slurry to form a pole piece, drying the pole piece, and finally assembling high-purity zinc foil, 3mol L <-1 > Zn (CF3SO3) 2 or ZnSO4 aqueous electrolyte and a glass microfiber diaphragm or chemical analysis filter paper into the water-based zinc ion battery. The positive electrode material prepared on the basis of the preparation method shows excellent stability and relatively high reversible capacity in an electrochemical testing process, and has relatively great application potential.

The invention discloses a preparation method for non-stoichiometric ratio type nanometer VO2-x powder for regulating and controlling phase transition temperature. A target product is obtained through carrying out hydrothermal reaction and annealing treatment on a precursor made of oxalic acid, de-ionized water and vanadium source, the stoichiometric ratio of the product is controllable (x=0-0.05), the phase change temperature can be regulated in the range of Tc=63.0-53.5 degrees centigrade, and the material is more excellent in phase change performance and better for manufacturing a thermochromic smart window, a field effect transistor and the like. The preparation method for the non-stoichiometric ratio type nanometer VO2-x powder for regulating and controlling the phase transition temperature is short in production period, simple in technique, moderate in reaction condition, environmental friendly, low in cost and suitable for large-scale production; the prepared powder can be prepared into a piece of large VO2-x film with adjustable phase change temperature through combining with a powder film forming technology; the preparation method is good for breaking through the application bottleneck of a vanadium dioxide smart window.

The invention provides a method for improving bismuth ferrotitanium oxide nano-powder aggregation. The method comprises the steps that 1, bismuth ferrotitanium oxide nano-powder and acid liquor are mixed, and suspension is obtained; 2, the suspension is subjected to sealing standing or sealing stirring, and mixed liquor is obtained; 3, the mixed liquor is subjected to ultrasonic dispersion, and dispersion liquid is obtained; 4, the dispersion liquid is subjected to centrifugation, washing and freeze drying, and a dispersed product is obtained. By means of the method, the bismuth ferrotitanium oxide powder aggregation problem can be effectively solved, the crystal structure and morphology of bismuth ferrotitanium oxide particles cannot be destroyed, and the bismuth ferrotitanium oxide nano particles good in monodispersity can be obtained.

The invention discloses a multiplication type perovskite organic composite photoelectric detector and a preparation method thereof. The device structurally comprises a transparent substrate, an anode, a hole transport layer, a perovskite layer, a spacer layer, an electron transport layer, an electron capture layer, a hole transport side and a metal cathode in sequence, wherein the perovskite layer is a perovskite thin film prepared by a spin-coating soaking dynamic spin-coating method, the spacer layer is a blending layer of TAPC and C60 or C70, and the electron capture layer is a blending layer of MoO3 and C60 or C70. According to the invention, the electron capture layer is evaporated on the perovskite layer, the damage to the perovskite film is reduced while the photomultiplication effect is obtained by using the electron capture induced hole tunneling injection mechanism, and the perovskite material does not need to be prepared in a glove box, so the application of the perovskite material in the direction of a photoelectric detector is expanded.

The invention discloses a treatment method for regulating and controlling morphology and particle size of oxysulfide fluorescent powder through laser irradiation, and belongs to the field of photoelectric materials. A precursor is prepared by adopting a solvothermal method, and the magneton-shaped Gd2O2S: Tb single crystal fluorescent powder with high fluorescence property is prepared by calcining the precursor in a sulfur-containing atmosphere, and then irradiating suspended particles of the fluorescent powder by using laser, thereby regulating and controlling the morphology and the particle size of the fluorescent powder on the basis of ensuring the crystallization property. The method is characterized in that (1) the magneton-shaped Gd2O2S: Tb single crystal fluorescent powder is obtained through a solvothermal method and a calcination mode in a sulfur-containing atmosphere; and (2) non-focused laser is introduced, and laser irradiation is performed on the fluorescent powder suspended particles under a stirring condition. The fluorescent powder is irradiated by laser, the regulation and control process is efficient, rapid, green and environment-friendly, other impurities are not introduced, the size and morphology of the fluorescent powder are controllable, and the surface is free of ligand and high in modifiability.

The invention discloses a modification method for a small-grain NaY type molecular sieve. According to the method, a NaY type molecular sieve raw material with a high silica-alumina ratio, a high degree of crystallization and good stability is employed and successively undergoes alkali washing, ammonium exchange, aluminum removal and silicon supplement, hydro-thermal treatment and treatment with a mixed solution of acid and an ammonium salt; and the obtained small-grain Y type molecular sieve has a high SiO2/Al2O3 mol ratio and a high proportion of secondary pores, retains the stability of a Y type molecular sieve and has a high specific surface area and a high degree of crystallization. The small-grain Y type molecular sieve prepared in the invention is applicable as a cracking component for a hydrocracking catalyst used for high and medium oil and enables the hydrocracking catalyst to have good activity, medium oil selectivity and product properties.

The invention discloses a hydrocracking catalyst carrier and a preparation method thereof. The catalyst carrier is composed of a small-grain Y type molecular sieve, amorphous silica-alumina and alumina. According to the preparation method, the small-grain Y type molecular sieve with the characteristics of proper dealumination degree, good crystallinity retentivity and well-developed secondary pores is used as an acid component; and when the small-grain Y type molecular sieve and the amorphous silica-alumina are cooperatively used for preparing a hydrocracking catalyst, the hydrocracking catalyst has the advantages of good activity, heavy naphtha selectivity and superior product quality.

The invention discloses a high-concentration high-dispersity ultrathin molybdenum disulfide dispersion liquid and a preparation method thereof. Molybdenum disulfide is used as a raw material, ionic liquid crystal is used as an auxiliary agent, the raw material and the auxiliary agent are dispersed in deionized water according to a specific proportion, and a water-based high-concentration high-dispersity ultrathin molybdenum disulfide dispersion liquid is prepared by adopting an ultrasonic mode. The prepared molybdenum disulfide dispersion liquid can be stably stored for a long time at normal temperature, the preparation process is simple and efficient, the production period is short, and the method is suitable for large-scale production; and the molybdenum disulfide prepared by adopting water as a solvent has no residual organic matters on the surface, is low in production cost, environment-friendly and high in safety coefficient, does not destroy the crystal structure of molybdenum disulfide, and has a very high application value.

The invention discloses a high-concentration carbon nanotube slurry and a preparation method thereof, and solves the technical problem of poor stability of the carbon nanotube slurry in a water environment, the preparation method comprises the following steps: 1) mixing carbon nanotube powder and ionic liquid crystal in a mass ratio of (1: 1)-(5: 1), adding the mixture into deionized water, and fully stirring and uniformly mixing to obtain a mixed solution; 2) putting the mixed solution into a reaction kettle, and carrying out hydrothermal reaction at 150-250 DEG C; 3) taking out a product after the hydrothermal reaction to obtain high-concentration carbon nanotube slurry; the prepared high-concentration carbon nanotube slurry is high in concentration and good in dispersity, can be stably stored for more than 6 months for a long time under the condition of normal temperature, and has relatively high application value.