60results about How to "Stable lattice structure" patented technology

The invention discloses a method for preparing a high-rate nickel cobalt lithium aluminate anode material. The method comprises the following steps: (1) preparing a nickel cobalt lithium aluminate precursor; (2) performing lithium-site doping and modifying on potassium ions; and (3) constructing a cladding layer of a lithium-containing compound. According to the method, the dispersing speed of lithium ions is effectively increased by lithium-site replacement of potassium ions, and the rate capability of a material can be improved; the lithium-containing compound layer constructed on the material surface can be used for reducing the content of alkali remained on the material surface and reduce later cell bubbling; side reaction can be effectively inhibited, and the material structure stability in the cycling process can be promoted; and the lithium-containing compound layer has high conducting performance for lithium ions, embedding and separating of lithium ions can be accelerated, the problem of poor lithium ion conductivity when conventional metal oxide is used as the cladding layer can be solved, and the cycling performance and rate performance of the material can be improved.

The invention discloses a preparation method of a nano-composite membrane electrode material. The preparation method comprises the following steps: (1) dissolving a precursor of manganese, a precursor of titanium and a precursor of carbon in an organic solvent to prepare a spinning solution; (2) performing electrostatic spinning on the spinning solution to obtain a nano-fiber material; and (3) after performing pre-oxidation treatment on the nano-fiber material, performing carbonization treatment in an inert atmosphere to obtain the required nano-composite membrane electrode material. The MnOx/TiO2/C nano-fiber composite membrane electrode material prepared by the preparation method is excellent in performance, nano particles of MnO2 and TiO2 are distributed on carbon nanofibers with good electric conductivity and porous structure in a mutually interlaced manner, and crystal structures of MnO2 and TiO2 nano particles affect each other and the MnO2 and TiO2 nano particles coordinately distribute on the carbon nanofiber membrane , so that the intercalation and deintercalation efficiency of lithium is improved, and the cycle performance and rate performance of the electrode material are improved; and moreover, the porous structure of the carbon nano-fibers provides a passage for the intercalation and deintercalation of lithium ions, and the electric conductivity is improved.

The invention relates to a preparation method of an NCM ternary cathode material doped with Al<3+> on the surface and belongs to the field of chemical energy storage batteries. The preparation methodprovided by the invention has the benefits that aluminum nitrate is added in the mixing process of a nickel-cobalt-manganese hydroxide precursor and lithium hydroxide to realize the doping of the Al<3+> on a lithium layer on the surface; compared with the situation that the Al<3+> is doped on a transition metal layer in the preparation process of the nickel-cobalt-manganese hydroxide precursor, the Al<3+> exists on the lithium layer and can better play a supporting role, less Al<3+> can be used to achieve a structure stabilizing effect, and particularly, and the improvement effect on electrochemical performance at high voltage and high rate is significant. The preparation method provided by the invention is simple to operate, a process and a technology are easy to realize, the large-scalecommercial application can be realized, and the method can be used for Al<3+> doping on the surface of other ternary cathode materials or a lithium-rich cathode material.

The invention relates to an NCM ternary cathode material with surface layer doping of Ce<3+> and surface layer coating of CeO2 and a preparation method of the ternary cathode material, and belongs tothe field of chemical energy storage battery. The material has the chemical formula of wCeO2-Li[Ni<1-x-y-z>MnxCoyCez]O2, wherein 0.8 < 1-x-y-z < 1, 0 < x+y+z < 0.2, 0.005 <= w+z <= 0.03. Cerium nitrate and the NCM ternary cathode material are subjected to supersonic treatment in ethanol for 1-2 h and then are uniformly ground; the mixture is calcined at 500-750 DEG C for 4-6 h and then is cooled in the furnace. In the material, Ce<3+> can stabilize the layered framework of the NCM ternary cathode material for reducing mixed arrangement of Li<+>/Ni<2+> in the surface layer of the cathode material. By surface coating of the CeO2, an electrolyte/electrode interface structure is stabilized. The NCM ternary cathode material is significantly improved in rate capability and cycling stability.

The invention discloses a material with stable change-resistant capability and a change-resistant memory belonging to field of semiconductor non-volatility memory. The material is an HfO2, ZrO2 or CeO2 thin film doped with metallic element ions of +3 valence. The HfO2, ZrO2 and CeO2 in the change-resistant material have stable lattice structure and less defect state, and Hf, Zr and Ce ions all have +4 valence. Defect can be artificially introduced by doping metallic element ions of +3 valence into the HfO2, ZrO2 and CeO2. So that, HfO2, ZrO2 or CeO2 thin film doped with metallic element ions of +3 valence can be used as change-resistant layer, stability and controllability of change-resistant storage are effectively increased by artificially controlling concentration of defect generation.

The invention discloses a direct-electroplating conductive liquid and a preparation method thereof. The method comprises the following steps of adding graphene of 0.5-2.0g/L and a stabilizer of 0.2-0.6g/L into the deionized water of 500mL, dispersing by ultrasonic with frequency of 45KHz and power of 100W at 60-80 DEG C for 1-3 hours, then adding 200mL of 1-3% of an organic or inorganic stabilizer, regulating the pH value to 9-11 with a pH value modifier of 10%, replenishing the deionized water to 1000mL, dispersing by the ultrasonic continuously for 1 hour, and obtaining 1L of the direct-electroplating conductive liquid. The stabilizer comprises one or more agents among polyacrylic acid, carboxymethylcellulose, and sodium silicate. Being used for hole metallization, the conductive liquid provided by the invention has the advantages that the grain size is small, the use level is small, the adsorption capacity is strong, the formed grain layer is compact, the conductivity is strong, and the electroplating efficiency is high; furthermore, the conductive liquid is convenient and simple to use and maintain, and environment contamination is avoided.

The invention relates to a preparation method of an NCM ternary positive electrode material with La3+ doped on a surface layer, belonging to the field of chemical energy storage batteries. According to the method of the invention, La3+ is doped in the process of mixing a nickel cobalt manganese hydroxide precursor with the lithium salt, and the doped La3+ enters a transition metal layer of the surface layer to occupy the position of Ni2+ and can play roles in supporting the framework, suppressing the phase change of the surface layer structure and suppressing the mixed arrangement of Li+/Ni2+;in addition, La3+ has a relatively large ionic radius, and after La3+ is doped to enter the transition metal layer, a channel for embedding and extraction of Li+ can be widened, the transmission rateof Li+ can be improved, and the electrochemical performance of the NCM ternary positive electrode material at high voltage and high magnification (4.5V, greater than or equal to 1C) can be significantly improved.

The invention discloses a preparation method of a Co-Al active material coated nickel-cobalt-aluminum ternary layered positive electrode material. The method comprises the steps: employing LDH as a coating material precursor, and coating the surface of an NCA ternary material precursor with the coating material precursor; mixing lithium salt with the NCA ternary material precursor, and performinghigh-temperature calcination to prepare the nickel-cobalt-aluminum ternary layered positive electrode material. According to the material, the outer layer of the NCA ternary material is coated with anLi-Co-AlO2 coating layer which has certain electrochemical activity, so the performance of the battery is improved under the condition that the capacity of the battery is not lost. A Co-Al lithium compound has a more stable lattice structure and has a positive effect on the cycling stability of the material. Besides, in the lattice structure of the compound, some defect vacancies can be reservedin the structure due to the mutual doping influence of the compound, so that electron conduction and ion diffusion are facilitated, and the rate capability of the battery is improved. The method is simple to operate, novel in strategy and obvious in effect.

The present invention relates to a honeycomb type SCR denitration catalyst and a preparation method thereof, and belongs to the field of denitration catalysts. According to the present invention, diatomite and a molecular sieve are used to replace a large number of titanium dioxide as the carrier, such that the high cost problem of the existing catalyst is easily solved, and advantages of good chemical stability, good thermal stability, high activity, low cost, high anti-poisoning property, long service life and the like are provided; the rare earth oxide is added, such that the heat resistance of the catalyst can be improved, and the double effect of lattice structure stabilizing and volume shrinkage preventing can be provided; polyferrocene is the polymer reducing agent so as to easily improve the denitration rate of the denitration catalyst, wherein the denitration efficiency achieves more than or equal to 91%; and the honeycomb type SCR denitration catalyst preparation method has characteristics of simpleness, easy performing, and high production efficiency.

The invention relates to a rare-earth modified SCR denitrification catalyst and a preparation method therefor, and belongs to the field of denitrification catalysts. The rare-earth modified SCR denitrification catalyst takes aluminum oxide and nano titanium dioxide as carriers and takes rare-earth oxide and cross-linked chitosan resin as active centers; and the prepared catalyst is low in price, good in chemical and thermal stability, relatively high in activity, high in anti-poisoning performance and long in service life. The preparation method for the rare-earth modified low-temperature SCR denitrification catalyst is simple, feasible and high in production efficiency; and raw materials are easily available.

Belonging to the field of chemical energy storage batteries, the invention relates to a preparation method of an NCM ternary positive electrode material doped with Y<3+> on the surface. According to the method, Y<3+> doping is carried out in the mixing process of a nickel cobalt manganese hydroxide precursor and a lithium salt, the doped Y<3+> enters a transition metal layer on the surface, occupies the position of Ni<2+>, and can play the role of supporting the framework, inhibiting the surface structural phase transition and inhibiting Li<+>/Ni<2+> mixing. In addition, Y<3+> has a large ionradius, and after being doped into the transition metal layer, is conducive to broadening the insertion and deinsertion channel of Li<+> and improving the Li<+> transmission rate, and can significantly improve the electrochemical properties of the NCM ternary positive electrode material under high voltage and high rate (4.5V, greater than or equal to 1C).

The invention relates to a high-rate long-cycle performance multi-element composite positive electrode material and a preparation method thereof, wherein the positive electrode material is a hollow structural sphere with D50 of 2-7 microns, and the chemical formula of the positive electrode material is LixNiyCozMn1-y-zO2; the positive electrode material is internally doped with 0.02-1mass% of a Zcompound, wherein Z is at least one of Nb or Ta; an aluminum compound accounting for 0.01-1mass% of a matrix is coated on the surface of the positive electrode material; and in the chemical formula, x, y and z are the values of the molar ratio of the related elements, wherein x is greater than 0.9 and less than 1.3, y is greater than or equal to 0.2 and less than 1, z is greater than 0 and less than 0.5, and y+z is less than or equal to 1. By virtue of the hollow structure of the invention, the infiltration and liquid retention capability of the non-aqueous electrolyte can be enhanced, the path of lithium ion transmission can be effectively shortened, and an effective structure support is provided for high-current high-rate charge and discharge; and the hardness of the hollow sphere structure can be increased, the crystal lattice junction also can be stabilized, and meanwhile, the cycling performance of the material is greatly improved.

A method for forming a semiconductor structure comprises the following steps: providing a substrate; forming gate structures on the surface of the substrate; forming an initial stress layer on the surface of the substrate on the two sides of the gate structures, wherein the material of the initial stress layer is amorphous; forming a cover stress layer on the surface of the initial stress layer; and after the cover stress layer is formed, converting the material of the initial stress layer into a crystalline material through a solid-phase process, and forming a source and drain stress layer. The morphology and the performance of the formed semiconductor structure are improved.

The invention discloses a high-temperature-resistant energy-saving nano coating. The high-temperature-resistant energy-saving nano coating is divided into a bottom coating and a surface coating in a weight ratio of 1:2, wherein the weight ratio of a component A to a component C in the surface coating is 1:(1.2-1.5), and the weight ratio of a component B to the component C in the bottom coating is 1:(1.0-1.5); the component A consists of feldspar, flint clay, kaolin, mullite, iolite, zirconium dioxide, zeolite, nano aluminum oxide, mica and zircon sand; the component B consists of nano titanium dioxide, conventional titanium dioxide, nano silicon dioxide, conventional silicon dioxide and nano aluminum oxide; and the component C consists of aluminum dihydrogen phosphate. The high-temperature-resistant energy-saving nano coating has long-term stable high emissivity, is compact in coating layer, has high high-temperature anti-powdering performance, and is long in service life, convenient to industrialize, and good in energy-saving effect.

The invention belongs to the technical field of wave-absorbing materials, and particularly relates to a composite wave-absorbing material and a preparation method thereof. The preparation method of the composite wave-absorbing material comprises the steps: (1) dissolving a cobalt source, urea and ammonium fluoride in water, performing a hydrothermal reaction, and performing cooling and high temperature annealing so as to obtain Co3O4; (2) dissolving Co3O4 and sodium sulfide in water, performing a hydrothermal reaction, and then carrying out high temperature annealing so as to obtain three-dimensional cobalt sulfide; (3) mixing the three-dimensional cobalt sulfide and a modifier aqueous solution, and performing modification so as to obtain modified three-dimensional cobalt sulfide; (4) compounding the modified three-dimensional cobalt sulfide and a graphene oxide aqueous solution so as to obtain a primary cobalt sulfide/graphene oxide composite material; and (5) performing heating reduction on the primary cobalt sulfide/graphene oxide composite material, and performing drying so as to obtain the composite wave-absorbing material. Through the preparation method, the technical defectsof a narrow frequency band, low efficiency and a complicated preparation process of a traditional graphene-based composite wave-absorbing material are overcome.

The invention relates to a denitration and demercuration catalyst and belongs to the field of environment-friendly catalysts. Components of the catalyst form a Mo-V-W/TiO2-Al2O3 system, the functions of denitration and demercuration are achieved at the same time under the effect of the active components Mo, V and W and the carrier TiO2-Al2O3, the structure of tail gas filtering and exhausting equipment can be effectively simplified, and environmental protection cost is reduced. In addition, the catalyst has high dust interference resisting capacity, and still can exert maximum filtering performance on the basis that no frequent halt is needed for removal of accumulated dust, and the catalyst is uniform in aging speed, high in filtering-out capacity and long in service life.

The invention discloses a volume phase metallic element doped positive electrode material used for lithium ion batteries and a preparation method of the material for cladding, relates to the field ofsecondary batteries, in particular to a volume phase metallic element doped positive electrode material used for lithium ion batteries and a preparation method of the material for carrying out cladding modification on high-stability oxides. The doping of metallic elements for the positive electrode material used for manganese-based lithium ion batteries is carried out by using a coprecipitation method of a water-ethyl alcohol system, the cladding of the high-stability oxides for the positive electrode material is carried out by using a liquid phase method of the water-ethyl alcohol system, anddoping modification is carried out on the base material, so that the specific discharge capacity of the material is improved; secondary reactions between the positive electrode material and an electrolyte are reduced through cladding, so that the positive electrode material has preferable cycle performance, the consumption of lithium ions in the charging and discharging process is reduced througha compact and uniform cladding layer, and the capacity of the material and the rate capability are improved. The positive electrode material used for lithium ion batteries disclosed by the inventionis used in the field of batteries.

The invention relates to a red light quasi-two-dimensional perovskite light-emitting diode with a dication structure. The red light quasi-two-dimensional perovskite light-emitting diode comprises a perovskite light-emitting layer, which is prepared by adopting the following method of: dissolving materials in a DMSO solvent according to a molar ratio of PEAI:MAI:CsI:PbI2:BaCl2=(0.14-0.16):(0.10-0.13):(0.09-0.11):(0.17-0.19):(0.005-0.015) to obtain a precursor solution; and adding a PEO solution with the same volume as the precursor solution into the precursor solution, stirring the mixed solution, spin-coating the mixed solution on the surface of a hole transport layer, and annealing the hole transport layer to obtain the perovskite light-emitting layer. By introducing a dication strategy and a BaCl2 doping strategy, exciton quenching and carrier non-radiative recombination of the light-emitting layer of the device are successfully reduced, a smoother perovskite light-emitting film is obtained, most of leakage current loss is reduced, and the brightness, the current efficiency, the external quantum efficiency and the like of the device are greatly improved.

The invention relates to an NCM ternary cathode material with recombinant La2nNi0.5Li0.5O4 and doped La<3+> on a surface layer, and belongs to the field of chemical energy storage batteries. The material is prepared by the steps of mixing an NCM ternary cathode material with La(NO3)3.6H2O to obtain a mixture, wherein the mixture is subjected to ultrasonic treatment in absolute ethanol for 1-2 hours, then uniformly grinding by using the absolute ethanol as a solvent, and calcining obtained powder to obtain the material, wherein the mass fraction of an element La in the mixture is 1-2.5%, the calcining temperature is 500-750 DEG C, and the calcining time is 4-6 hours. According to the material, the cycling performance and the rate performance of the NCM ternary cathode material are enhanced,the heat stability and the capacity retention rate of the NCM ternary cathode material are improved, and the structural stability of the NCM ternary cathode material in electrochemical cycling is remarkably improved.

The invention discloses a sodium-ion battery positive electrode material additive and a sodium-ion battery positive electrode material, and belongs to the technical field of sodium-ion batteries. The chemical composition of the sodium ion battery positive electrode material additive is NaA@NaxNiyM1-yO2, wherein x is more than or equal to 0.8 and less than or equal to 1.2, y is more than or equal to 0.1 and less than or equal to 0.5, M is selected from at least one of Zn, Ag, Zr, Mo, Mg and Nb, and A is selected from at least one of F<->, CN<->, Cl<->, Br<->, HSO4<-> and H2PO4<->; and the phase of the additive is O3 type. When the additive is added into a P2 type positive electrode base material to prepare the positive electrode material, the lattice structure can be stabilized in the sodium ion embedding and de-embedding process, the lattice collapse can be reduced, the specific capacity and the cycling stability of the sodium ion battery can be improved, and the service life of the sodium ion battery can be prolonged.

The invention discloses a lithium ion battery positive electrode material and a preparation method thereof. The preparation method comprises the following steps: (1) providing a phosphate radical source, an aluminum ion source, a lithium ion source and lithium cobalt oxide; (2) dissolving a phosphate radical source, an aluminum ion source and a lithium ion source in water, then adding lithium cobalt oxide, mixing, carrying out hydrothermal reaction precipitation after mixing, separating the precipitation, and drying to obtain a mixed powder material; and (3) carrying out heating treatment on the mixed powder material obtained in the step (2) in an atmosphere protection environment at the temperature of 700-1000 DEG C for 58 hours to obtain modified lithium cobalt oxide, namely the lithiumion battery positive electrode material. According to the preparation method, a composite compound is efficiently and controllably introduced into the surface of lithium cobalt oxide in situ by utilizing an interface reaction, molecular-level surface modification is realized, active oxygen in crystal lattices on the surface of lithium cobalt oxide is stabilized by utilizing a phosphorus element, and long-acting stable circulation of the lithium cobalt oxide positive electrode material under 4.6 V or even 4.7 V high voltage is realized.