57 results about "Lamellar crystals" patented technology

The invention discloses a preparation method of a high-rate wide-temperature-range regenerated graphite negative electrode material, and belongs to the technical field of lithium ion battery recovery. The invention provides a preparation method of a high-magnification wide-temperature-range regenerated graphite negative electrode material, which combines a multi-section high-temperature synergistic treatment means and a lithium-rich catalytic surface modification technology, realizes impurity removal of a waste graphite negative electrode under the condition of lower energy consumption, and realizes effective repair of a graphite crystal structure. According to the method, through the synergistic effect of ultrahigh-temperature gasification and the reactive atmosphere, trace metal impurities which are most difficult to remove and fluorine-containing compounds with thermal stability are almost thoroughly removed, and the purity of the regenerated graphite is improved to be close to the level of a primary material (the purity gt is 99.9%); and a lithium-rich catalytic surface modification technology is adopted, so that the graphite surface can be stabilized, and the rate capability and low-temperature performance of the material are improved. The graphitization degree (gt; 95%) of the material is remarkably improved through the in-situ defect repairing effect driven by ultrahigh temperature, and the highly-ordered layered crystal structure and the excellent conductive network of the material are recovered.

The invention discloses a highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator for X-ray detection imaging and a preparation method of the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator, and relates to the technical field of radiation detection and scintillation materials, the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator comprises phenethyl ammonium bromide, cesium lead tribromide and ammonium thiocyanate, the molar ratio of the phenethyl ammonium bromide to the cesium lead tribromide to the ammonium thiocyanate is 2: 4: 2, the scintillator contains a methylamine thiocyanate additive which accounts for 0-1 equivalent weight of the dosage of the ammonium thiocyanate, and the scintillator is of a flaky polycrystal structure; the perovskite crystal of the polycrystalline wafer has a quasi-two-dimensional layered crystal structure, and each crystal grain is arranged in a height orientation manner, so that the layered crystal face is parallel to the main plane of the scintillator sheet. According to the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator for X-ray detection imaging and the preparation method of the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator, a highly-oriented layered structure is formed in the crystal, diffuse scattering of emergent light is greatly reduced, brightness uniformity and spatial resolution of X-ray imaging are improved, and a finer imaging effect is achieved.

This invention discloses a type of sodium titanate with a layered crystal structure, its preparation method, and its application in aqueous magnesium-ion batteries, belonging to the field of aqueous magnesium-ion battery technology. This invention uses sodium titanate with a layered crystal structure as the negative electrode material in aqueous magnesium-ion batteries. Due to its excellent chemical and structural stability, sodium titanate can achieve reversible magnesium deposition in aqueous magnesium electrolytes. 2+ Intercalation / extraction. This invention synthesizes Na via a hydrothermal method and a high-temperature annealing process. 2 Ti 2 O 5 And Na 2 Ti 3 O 7 Materials. In magnesium chloride electrolyte, both sodium titanate materials exhibit extremely low charge / discharge potentials (Na). 2 Ti 2 O 5 -1.3 to -0.6V vs. SCE; Na 2 Ti 3 O 7 (-1.5 to -1V vs. SCE) and good cycle stability. Furthermore, Na... 2 Ti 2 O 5 The half-cell exhibits a charge-discharge specific capacity of up to 213 mAh / g at a current density of 2 A / g, and maintains a high specific capacity of 150 mAh / g even at a high current density of 10 A / g. The sodium titanate of this invention is an ideal anode material for aqueous magnesium batteries, possessing both low cost and environmental friendliness, and shows great promise for application in the field of aqueous magnesium-ion energy storage.

The invention relates to a multi-metal element nano-aluminum adjuvant and a preparation method and application thereof, the nano-aluminum adjuvant is a nano-particle containing an aluminum element and at least one metal element selected from magnesium, zinc and calcium, the nano-particle has a layered crystal structure, and the particle size is distributed in a range of 20-2000 nm. The difunctional nano-aluminum adjuvant has the beneficial effects that the difunctional nano-aluminum adjuvant is simple and convenient in preparation method, definite in component and uniform in particle size, the particle size of the particles can be manually regulated and controlled, and the difunctional nano-aluminum adjuvant can directly promote antigen presenting cells to be mature and activated and carry out MHC-I or II type antigen presentation.

The invention relates to a positive electrode and a manufacturing method thereof. The positive electrode includes a first positive electrode active material having an olivine crystal structure and a second positive electrode active material having a layered crystal structure in a positive electrode active layer, thereby resulting in high safety and excellent charge / discharge capacity of the positive electrode. In addition, the positive electrode has an advantage of excellent energy density and output by including a first positive electrode active material represented by Chemical Formula 1 including three or more metals in addition to lithium.

An object of the present invention is to provide a method for producing a polymeric molded product, which enables expansion of a temperature range that can be used for partial melting. The method for producing a polymeric molded product, comprises subjecting a crystalline polyhydroxyalkanoate to a heating treatment at a temperature equal to or higher than a glass transition temperature; and melt-molding a polyhydroxyalkanoate yielded by the heating treatment, which comprises lamellar crystals that are different in lamellar thickness, in a temperature range where some of the lamellar crystals undergo melting and flowing, and the other balance lamellar crystals remain unmelted.

To provide a technique for recovering a capacity in a deteriorated positive electrode active material and reducing a reaction resistance increased by deterioration without using a means of calcination SOLUTION: According to the technology disclosed herein, a method for producing a regenerated positive electrode active material is provided. The production method includes preparing a positive electrode active material and polishing the positive electrode active material. The positive electrode active material includes a core particle having a layered crystal structure and a coating portion having a rock salt crystal structure on a surface of the core particle. In this production method, at least a part of the coating portion is separated from the core particle by polishing. The ratio (IB / IA) between the peak intensity IA at the 8341eV of the nickel (Ni) - K absorption edge measured by XAFS analysis for the positive electrode active material before polishing and the peak intensity IB at the 8341eV of the nickel (Ni) - K absorption edge measured by XAFS analysis for the positive electrode active material after polishing is 0.7 or less.SELECTED DRAWING: None

The invention relates to the technical field of nitrogen-containing graphene, in particular to a method for preparing nitrogen-containing graphene by taking chitosan as a raw material, which comprises the following steps: dissolving chitosan in an acetic acid solution with the concentration of 3-5% to form a mixed solution, uniformly coating the mixed solution on the surface of a quartz base material by adopting a spin-coating technology, and under a nitrogen protection environment, preparing the nitrogen-containing graphene by taking the chitosan as the raw material. Slowly heating the base material coated with the mixed solution to 200-3500 DEG C, and annealing for 2 hours to obtain a chitosan film; then carrying out two-step carbonization to obtain a pre-carbonized product; and uniformly mixing the obtained pre-carbonized product with a regulation agglomeration agent, carrying out two-step activation treatment, and after the activation is completed, carrying out post-treatment on the product to obtain a nitrogen-containing graphene product. The nitrogen-containing graphene prepared by the method has a D / G ratio of 0.87 and a 2D / G ratio of 0.71, has few defects and has a good layered crystal structure, and the dielectric constant of a nitrogen-containing graphene device prepared subsequently is only 3.53.

The invention discloses a high-stability rubidium-boron-silicon superhard compound and a preparation method thereof, and belongs to the technical field of superhard materials, the superhard compound is a composite structure block material formed by taking rubidium-boron-silicon as a basic framework and introducing an alkali metal regulator; the composite structure comprises a high-entropy ceramic matrix and nano twin crystals distributed in the matrix; the high-entropy ceramic matrix is a solid solution consisting of rubidium, boron, silicon and alkali metal cations introduced by the alkali metal regulator; the nano twin crystal is a lamellar crystal structure with coherent twin boundaries; through collaborative innovation of a material system and a preparation process, the rubidium-boron-silicon superhard compound with ultrahigh hardness and excellent thermal stability is developed, and a brand new solution is provided for superhard materials serving in an extremely high-temperature environment.

The present invention relates to two-phase single-crystal positive electrode materials for cycled lithium-ion batteries and methods of making the same. A method of making a positive electrode for a cycled lithium-ion battery is disclosed, as well as a battery comprising the positive electrode. In the disclosed method, single-crystal precursor particles are contacted with an aqueous solution. The precursor particles comprise a lithium-rich manganese-based transition metal oxide (LRMO) having a layered crystal structure, and the aqueous solution comprises exchangeable cations. Upon contacting the precursor particles with the aqueous solution, lithium ions are removed from an outer surface portion of the precursor particles, and the LRMO in the outer surface portion of the precursor particles is converted to a lithium-deficient manganese-based oxide (LDMO). The precursor particles are then heated such that the LDMO in the outer surface portion of the precursor particles undergoes a phase transition and is converted to a lithium manganese-based transition metal oxide having a spinel crystal structure (spinel-LMO).

An object of the present invention is to provide a method for producing a polymeric molded product, which does not undergo a considerable molecular weight reduction during melt-molding, even in a polymer may easily lose its molecular weight when it is in a melted state. The present invention provides a method for producing a polymeric molded product, which comprises melt-molding a polymer comprising lamellar crystals that are different in lamella thickness, in a temperature range where some of the lamellar crystals undergo melting and flowing, and the other balance lamellar crystals remain unmelted.

The application provides a natural tetrapeptide-based MOF material and a preparation method thereof. The natural tetrapeptide-based MOF material is assembled by a tetrapeptide, amino-glycine-histidine-glycine-glycine-carboxyl (GHGG) as a ligand and a divalent copper ion, and is abbreviated as Cu-GHGG, wherein the molar ratio of the ligand to the divalent copper ion is 1:1. The Cu-GHGG prepared by the application is a layered crystal, and the crystallization solvent is filled between layers during crystallization. After the crystallization solvent is removed by heating, the material still maintains crystallinity. The material after removal of the solvent can adsorb water molecules in the air by itself when placed in humid air.

The application belongs to the field of conductive silver paste, and particularly relates to a low-resistance wear-resistant conductive silver paste and a preparation method thereof. The preparation method is as follows: the silver paste of the application is a synergistic combination of flaky silver powder and nano silver material, the flaky silver powder forms a main conductive framework in the coating to ensure the basic conductive path, the nano silver material produces local fusion at the silver powder contact interface during solidification, effectively fills the micro pores, and significantly reduces the contact resistance between the particles. Ultra-fine hard ceramic particles subjected to surface treatment are additionally added, which are uniformly dispersed in the coating after solidification, bear and resist external force scratching. Meanwhile, solid lubricating materials with a layered crystal structure are introduced, which can form a transfer film on the contact surface during friction, convert sliding friction into low-resistance shearing between the layers, thereby reducing the wear rate from the root cause, and exhibiting excellent electrical stability and mechanical durability.

The invention provides a positive electrode material and a preparation method thereof, a positive plate and a battery. The positive electrode material comprises an inner core and a coating layer, the inner core comprises nickel cobalt lithium manganate, the chemical formula of the nickel cobalt lithium manganate is LiNi < x > < 1 > Mn < y > < 1 > Co < z > < 1 > O < 2 >, and x < 1 > + y < 1 > + z < 1 > = 1, and 0 lt; z1 < = 0.05; the coating layer comprises lithium nickel manganese oxide, the chemical formula of the lithium nickel manganese oxide is LiNix2Mny2O2, x2 + y2 = 1, and x2 is greater than or equal to 0.5 and less than or equal to 0.9; according to the invention, the coating layer is set to be cobalt-free lithium nickel manganese oxide, so that the coating layer has higher thermal decomposition temperature and more stable interface characteristics, and the safety performance of the battery is improved; the lithium nickel cobalt manganese oxide is adopted in the inner core, the cobalt content is low, positive ion mixing can be effectively inhibited, a layered crystal structure is stabilized, the high capacity and the ion migration rate of the material are guaranteed, meanwhile, the inner core is protected by the shell, side reaction with electrolyte is reduced, and therefore the cycle life is remarkably prolonged; according to the method, the cost of raw materials is greatly reduced, the dependence on scarce cobalt resources is reduced, and the sustainable development requirement is met.

The invention provides an oxidation-resistant core-shell structure powder material as well as a preparation method and application thereof, and belongs to the technical field of solid lubricating materials and tribological engineering. According to the oxidation-resistant core-shell structure powder material, MoS2 microparticles are used as an inner core, and a polyvinylidene fluoride polymer is used as a shell layer. The vinylidene fluoride polymer is used as a shell of the molybdenum disulfide, so that water molecules and oxygen can be prevented from being in direct contact with the molybdenum disulfide, the barrier and protection effects are achieved, an easily-sliding layered crystal structure of MoS2 is kept, the molybdenum disulfide is prevented from being oxidized into molybdenum trioxide, the oxidation resistance of the molybdenum disulfide in different environments is effectively improved, and the service life of the molybdenum disulfide is prolonged. The molybdenum disulfide microparticles prepared by the preparation method disclosed by the invention have the advantages that the storage life of the molybdenum disulfide microparticles is prolonged, the environmental dependence and sensitivity in lubrication application are reduced, and the molybdenum disulfide microparticles can adapt to different environmental atmospheres and still have lower friction coefficient and wear volume than a single-component material in a high-humidity environment. And the synergistic lubrication effect is achieved.

A method for manufacturing an abradable layer and a substrate coated with this layer, may include: preparing a powder composition including at least ceramic particles and an inorganic filler having a lamellar crystallographic structure, the volume content of the inorganic filler in the powder composition being in a range of from 1 to 75%; compressing the powder composition; and sintering the powder composition thus compressed in order to obtain the abradable layer.

The present disclosure relates to a method for manufacturing a regenerated positive electrode active material. Provided is a technique for restoring the capacity in a degraded positive electrode active material and reducing the reaction resistance increased due to degradation without using a firing means. According to the technology disclosed herein, a method for producing a regenerated positive electrode active material is provided. The manufacturing method comprises the following steps: preparing a positive electrode active material; and grinding the positive electrode active material. The positive electrode active material includes a core particle having a layered crystal structure, and a coating portion having a rock salt crystal structure on the surface of the core particle. In this production method, at least a portion of the coated portion is separated from the core particles by grinding. The ratio (IB / IA) of the peak intensity IA at 8341 eV of the nickel (Ni)-K absorption edge as measured in XAFS analysis of the positive electrode active material before polishing to the peak intensity IB at 8341 eV of the nickel (Ni)-K absorption edge as measured in XAFS analysis of the positive electrode active material after polishing is 0.7 or less.

The application belongs to the field of solid waste resource utilization and electrochemical energy storage technology, and more particularly relates to a solid electrolyte based on waste cement paste as well as a preparation method and application thereof. Through directional conversion reaction between calcium-silicon-aluminum hydration phase in waste cement paste and zinc sulfate solution, a gypsum-alkali zinc sulfate composite phase (ZnCP composite material) with a layered crystal structure is in-situ constructed, and a collaborative breakthrough of high-value recycling of waste resources and development of high-performance solid electrolyte is realized. The structure-performance synergistic mechanism of the ZnCP composite material makes the solid electrolyte provided by the application maintain excellent electrochemical stability in a wide temperature range of-20-60 DEG C, the Zn / / polyaniline full battery assembled has a cycle life of more than 420 times, and the zinc / / zinc symmetric battery is stably operated for more than 1500 hours without dendrite and hydrogen evolution.

Provided is a positive electrode that can provide a nonaqueous electrolyte secondary battery with high gas generation suppressing performance during storage and high cycle characteristics. The positive electrode disclosed here includes a positive electrode current collector and a positive electrode active material layer supported by the positive electrode current collector. The positive electrode active material layer includes monoparticulate first Ni-containing lithium composite oxide particles and secondary particulate second Ni-containing lithium composite oxide particles. The first Ni-containing lithium composite oxide particles and the second Ni-containing lithium composite oxide particles have layered crystal structures. The first Ni-containing lithium composite oxide particles have an average particle size (D50) of 2 μm to 6 μm. The second Ni-containing lithium composite oxide particles have an average primary particle size of 1.2 μm to 2.0 μm. The second Ni-containing lithium composite oxide particles have an average particle size (D50) of 12 μm to 20 μm.

A nonaqueous electrolyte secondary battery (10) is provided with a positive electrode (11), a negative electrode (12), and a nonaqueous electrolyte. A positive electrode mixture layer constituting the positive electrode (11) contains a positive electrode active material having a lithium-cobalt composite oxide having a layered crystal structure as a main component, and the lithium-cobalt composite oxide is a composite oxide represented by the general formula LiCo (1-w-x-y-z) AlwMgxTiyMnzO2 (in the formula, 0.010 < = w < = 0.013, 0.003 < = x < = 0.006, 0.0004 < = y < = 0.0006, and 0 < = z < = 0.0015). The nonaqueous electrolyte contains a lithium salt having a fluorosulfonyl group.

A battery cell, a battery apparatus and an electrical apparatus, relating to the technical field of batteries. The battery cell comprises a positive electrode sheet; the positive electrode sheet comprises a positive electrode current collector and a positive electrode film layer provided on at least one surface of the positive electrode current collector; the positive electrode film layer comprises a positive electrode active material and carbon nanotubes; the positive electrode active material has a layered crystal structure; the ratio of the average tube length of the carbon nanotubes to the Dv50 particle size of the positive electrode active material is (2-10):1. The carbon nanotubes improve the conductivity of the positive electrode active material having the layered crystal structure, and inhibit volume expansion of the positive electrode active material during cycling, such that the sheet resistance and sheet rebound of the positive electrode sheet are small, allowing the formed battery cell to exhibit excellent cycle performance.

The invention relates to the technical field of electromagnetic shielding materials, and particularly discloses a nano-silver composite flaky PA66 material as well as a preparation method and application thereof. The nano-silver composite flaky PA66 material is prepared by growing a porous structure on the surface of a PA66 film substrate and loading nano-silver on the porous structure. According to the invention, high-density nano lamellar crystals are prepared on a polymer film by using a multi-time epitaxial growth method, and surface modification is carried out on a multi-stage lamellar crystal structure through chemical silver plating, so that the nano-silver composite lamellar PA66 material is obtained, and the nano-silver composite lamellar PA66 material has good electromagnetic shielding effectiveness and realizes the effect of electromagnetic interference; a multi-time high-temperature epitaxial growth technology is utilized to construct a porous structure in which nylon lamellar crystals vertically grow, and the functional performance of the porous structure is further improved through chemical silver plating, so that a new direction is opened up for the design of electromagnetic shielding materials, and an important foundation is laid on the leading edge of development of interface materials and multifunctional polyamide.

The application belongs to the technical field of sodium ion negative electrode materials, and particularly relates to a two-dimensional transition metal dichalcogenide coated and modified biomass hard carbon negative electrode material and a preparation method and application thereof. The biomass hard carbon negative electrode material comprises a biomass hard carbon main body and two-dimensional transition metal dichalcogenides in-situ grown on the biomass hard carbon main body; the two-dimensional transition metal dichalcogenides have a layered crystal structure. The two-dimensional transition metal dichalcogenide coated and modified biomass hard carbon negative electrode material is prepared by using a simple sol-gel method combined with a calcination process, mainly by adjusting the number of oxygen-containing surface functional groups of the hard carbon, adsorbing two-dimensional transition metal dichalcogenide precursors in-situ under the promotion of a surfactant, and calcining to obtain the two-dimensional transition metal dichalcogenide coated and modified biomass hard carbon negative electrode material grown in-situ, so that the process is simple, the equipment requirement is low, and the product consistency is good.

The invention belongs to the technical field of melt spinning, and discloses a high-strength and high-elasticity PA66 fiber as well as a preparation method and application thereof. The method comprises the following steps: mixing PA66 and an elastomer according to a specific ratio, drying, carrying out melt spinning, directly inducing to form a high-regularity oriented lamellar crystal structure in the spinning process by utilizing a melt stretching technology, and carrying out annealing treatment, so that the tensile modulus and yield strength of the fiber can be remarkably improved without a traditional post-stretching process. According to the process, the flow is simplified, the energy consumption is reduced, the elastic recovery rate of the prepared fiber can be greater than 90% at room temperature, and the technical problem that the strength and the elasticity of the traditional PA66 fiber are difficult to consider at the same time is successfully solved.

The invention discloses an oil slurry hydrogenation catalyst and a preparation method thereof. The catalyst provided by the invention comprises a group VIB active metal, a group VIII active metal and gamma-Al2O3, the average lamellar crystal length of the active phase MoS2 is 7-12 nm, the average lamellar crystal layer number in a single stack layer is 1-5, and the proportion of stack layers with the layer number of 3-5 is 40%-90% on the basis of the total number of the stack layers. The preparation method comprises the following steps: (1) impregnating a hydrogenation catalyst carrier with an impregnation liquid containing Mo and Co, and after impregnation, loading the impregnated hydrogenation catalyst carrier into a fixed bed reactor for dry vulcanization; wherein the dry vulcanization process comprises the following steps: after hydrogen circulation is established, raising the temperature to 350-550 DEG C at normal temperature, keeping the constant temperature for 2-10 hours, and maintaining a certain H2S concentration in circulating hydrogen after 230 DEG C; and (2) introducing CO2 into the reactor, maintaining a certain CO2 concentration in the reaction system, and introducing catalytic gasoline to react for a period of time to obtain the oil slurry hydrogenation catalyst. The catalyst provided by the invention has high direct desulfurization activity, weakens the saturation performance of tricyclic and tetracyclic aromatic hydrocarbons, and is suitable for catalyzing the selective hydrodesulfurization reaction of slurry oil.

The application discloses a preparation method of layered Cr2O3 crystal material, which uses Cr2O3 powder as raw material, uses CrCl2 as transport agent, and adopts chemical vapor transport to prepare the layered Cr2O3 crystal material. The method comprises the following steps: (1) weighing and grinding the raw material; (2) using a vacuum sealing tube machine and a hydrogen-oxygen machine to seal the tube under vacuum; (3) setting corresponding temperatures in a double-temperature zone tube furnace to make the raw material react, and the layered Cr2O3 crystal material can be obtained after cooling. The method uses CrCl2 as the transport agent, can repeatedly transport Cr2O3, is easy to operate, has controllable quality, and has high repeatability. The method provides a material basis for the layered Cr2O3 crystal material to be used as a catalyst in a hydrogen evolution reaction and an anode material of a lithium ion battery.

The invention belongs to the technical field of electrochemical energy storage, and relates to a potassium ion battery containing an Rb-doped manganese-based layered oxide positive electrode material, the positive electrode of the potassium ion battery is the Rb-doped manganese-based layered oxide positive electrode material, and the potassium ion battery is prepared by the following steps: physically mixing a manganese source, a potassium source and a rubidium source as raw materials, ball-milling and grinding to obtain a precursor; wherein the total molar ratio of the Mn element in the manganese source to the K element in the potassium source to the Rb element in the rubidium source is (1: 0.5)-(1: 1); and carrying out high-temperature treatment and natural cooling. According to the invention, a specific amount of Rb ions are introduced to an alkali metal site of the material, and a layered crystal structure is effectively stabilized by using a pillar effect, so that the electrochemical performance of the material is remarkably improved. The material shows high first-circle coulombic efficiency and excellent cycling stability, such as capacity retention rate gt after 100 circles, in a potassium ion battery; 83%, and the rate capability is good.

A method for producing an abradable ceramic composite coating on a substrate, the method including: obtaining a pulverulent composition including a matrix powder and a ceramic filler hydrated precursor powder having a lamellar crystallographic structure, wherein the ceramic filler powder represents from 5 to 40% of the combined volume of the matrix powder and the ceramic filler powder, compressing the prepared pulverulent composition at a pressure greater than 150 MPa, and a step of reactive sintering the obtained pulverulent composition, during which the compression is maintained, at a temperature of less than 550° C., and the particles of the matrix powder in the sintered pulverulent composition have an aspect ratio of 2 or greater.

The invention relates to secondary particles (6) for cathodes of secondary lithium cells. The secondary particles have a multiplicity of primary particles (8), which each have a layered crystal structure in which layers of transition metal oxide (2) and lithium layers (4) alternate. Here, each primary particle (8) has a spatial extension in the direction of its crystallographic c axis (c) which is greater than in a direction perpendicular to this axis. The invention also relates to a method for producing the secondary particles.

There is provided an LDH separator including a porous substrate and a layered double hydroxide (LDH)-like compound that fills up pores of the porous substrate. The LDH-like compound is a hydroxide and / or an oxide with a layered crystal structure, containing (i) Ti, Y, and optionally Al and / or Mg, and (ii) at least one additive element M selected from the group consisting of In, Bi, Ca, Sr, and Ba.