109 results about "Composite crystal" patented technology

The invention discloses a deep eutectic gel electrolyte as well as a preparation method and application thereof, and belongs to the field of battery materials. The deep eutectic gel electrolyte is prepared from the polymerizable deep eutectic solvent and an initiator. Wherein the polymerizable deep eutectic solvent is obtained by mixing and heating the following independently stored components: a hydrogen bond donor and a hydrogen bond acceptor, wherein the hydrogen bond acceptor is a metal salt; the hydrogen bond donor is butanedinitrile and a polymerizable monomer. The preparation method of the deep eutectic gel electrolyte comprises the following steps: mixing the raw materials under a certain temperature condition, fully stirring to obtain a gel electrolyte precursor solution, and initiating polymerization under an illumination condition to obtain the deep eutectic gel electrolyte. The gel electrolyte prepared by the method has relatively high ionic conductivity and a relatively wide electrochemical stability window, and the cycle life of a symmetric battery and a total battery assembled by the deep eutectic gel electrolyte is obviously prolonged. Meanwhile, the quasi-solid-state sodium-ion battery and the lithium-ion battery prepared by the method are simple in technological process, and commercial production is easy to realize.

The invention discloses an application of a molybdenum disulfide-based piezoelectric catalytic material in a seawater uranium extraction material, and relates to the technical field of seawater uranium extraction, thiourea and sodium molybdate are used as precursors, and a MoS2 nanoflower with a specific 1T / 2H composite crystal structure is constructed through a hydrothermal synthesis technology. The method is placed in a uranyl nitrate solution, ultrasonic treatment is combined, efficient extraction of uranium can be achieved, and the method has potential application to extraction of uranium from seawater. The method is simple in process and environment-friendly, almost does not generate harmful waste in the synthesis process, does not need complex operation, and has good amplification preparation potential.

The invention relates to the technical field of grease processing, in particular to a preparation method for extracting refined vegetable oil fatty acid. A preparation method for refined vegetable oil fatty acid extraction comprises the following steps: vegetable oil refining treatment and refined vegetable oil fatty acid separation and extraction. In the vegetable oil refining treatment process, the degummed vegetable oil is subjected to deacidification and decolorization treatment by using the modified rice hull-based porous carbon, so that pigments, free fatty acids and heavy metal components in the vegetable oil can be efficiently adsorbed, the effects of adsorption, deacidification and decolorization are achieved at the same time, and the vegetable oil refining efficiency is effectively improved; vegetable oil refining quality is improved, so that the extraction effect of refined vegetable oil fatty acid is improved; in the separation and extraction process of fatty acid in the refined vegetable oil, the contact between urea and saturated fatty acid in the refined vegetable oil can be promoted by adding the crystallization inclusion additive, and a stably-clathrated composite crystal is quickly formed, so that the extraction purity of unsaturated fatty acid is improved.

The invention discloses a planar gate dual-control electrode 4H-SiC composite transistor structure which comprises a plurality of cell structures connected in parallel, each cell structure comprises an n buffer layer on a 4H-SiC n + substrate, an n-drift region, an n carrier expansion layer and p body regions in the two sides of the n carrier expansion layer, each p body region is of a mesa structure, an n + source region and a p + region are arranged in the upper part and the lower part, and a gap is formed between the n + source region and the p + region; gate oxide layers and polycrystalline silicon layers are arranged on the surfaces of the n carrier expansion layer, the p body regions on the two sides and part of the n + source region; a plane grid G is arranged on the surface of the polycrystalline silicon layer; a source S is arranged on the surface of the n + source region; a base B is arranged on the surface of the p + region; a drain electrode D is arranged on the back surface of the 4H-SiC n + substrate; the cellular structure is in bilateral symmetry with the planar grid G as the axis, equivalently, the VDMOS and the BJT are connected in parallel, the VDMOS is located in the center, and the BJT is located on the outer side. According to the invention, the conduction loss of the device can be reduced, the anti-short-circuit capability is improved, and the influence of a body diode is eliminated.

The invention relates to the technical field of concrete crack repairing agents, in particular to a triggered precipitation type concrete crack repairing agent as well as a preparation method and application thereof. The repairing agent is prepared from the following raw materials: sulphoaluminate cement, nano anhydrite with a core-shell structure, fluorine-phosphorus composite seed crystal, magnesium oxide, metakaolin and a water reducing agent, wherein the core-shell structure nano anhydrite is prepared by coating mesoporous silica with nano anhydrite, and the fluorine-phosphorus composite seed crystal is prepared from calcium fluoride and monocalcium phosphate through a hydrothermal reaction. According to the trigger precipitation type concrete crack repairing agent prepared by the invention, sulfate ions are slowly released through the core-shell structure nano anhydrite, the crystal form of ettringite is regulated and controlled through the fluorine-phosphorus composite seed crystal, the problems that a traditional repairing agent shrinks and falls off in the later period, the high-temperature strength is suddenly reduced, and the binding power is insufficient are solved, and the trigger precipitation type concrete crack repairing agent is suitable for concrete structure crack repairing and high-temperature environment engineering.

The invention relates to high-purity superfine aluminum oxide, a preparation method thereof and a lithium battery diaphragm, and relates to the technical field of lithium battery diaphragm materials. The method comprises the following steps: mixing industrial aluminum hydroxide, boehmite and a composite crystal form activator to obtain a mixed material; under the condition of a set temperature, calcining the mixed material to obtain alpha-aluminum oxide powder; and grinding the alpha-aluminum oxide powder to obtain the high-purity superfine aluminum oxide, and carrying out spray drying on the high-purity superfine aluminum oxide to obtain the target high-purity superfine aluminum oxide. The method provided by the invention has the advantages of simple process, low production cost and high production efficiency; and the corresponding product has the advantages of uniform crystal grains, high purity, superfine performance, narrow particle size distribution and high alpha-phase conversion rate.

The invention relates to the technical field of concrete crack repairing, and particularly discloses a quick-hardening concrete crack repairing agent and a preparation method thereof. The invention relates to a quick-hardening concrete crack repairing agent, which is prepared from the following raw materials: 45 to 55 parts of sulphoaluminate cement; 10 to 15 parts of silica fume; 12 to 18 parts of metakaolin; 5-8 parts of a bimetallic composite seed crystal; 10 to 15 parts of double-layer shell nano anhydrite; 2-4 parts of magnesium oxide; 0.5 to 1 part of polypropylene fiber; 0.5 to 0.8 part of a water reducing agent; 15 to 20 parts of water; the bimetallic composite seed crystal is a zirconium and strontium element co-doped composite crystal nucleus; the double-shell nano anhydrite is composed of an inner core nano anhydrite, a middle aluminum sulfate early strength phase and an outer mesoporous SiO2 shell. The quick-hardening concrete crack repairing agent has the advantages of being short in setting time, high in early strength and excellent in interface bonding performance.

The invention relates to a sapphire and titanium sapphire composite laser crystal which is composed of sapphire and a titanium sapphire crystal. The doping concentration of the titanium ions is 0-0.8%. And growing by a Bridgman-Stockbarger method. The preparation method has the advantages that 1) the high-quality and large-size composite laser crystal can be obtained through one-time crystal growth, the crystal interface is stable, high power density can be borne, and the crystal is an excellent gain medium of a high-power laser; and 2) the Bridgman-Stockbarger method is utilized to grow the composite crystal, so that the operation steps are simplified, a plurality of crystal surface treatment procedures are omitted, the production cost is reduced, and the possibility of generating defects such as color center, wrappage and degumming in the crystal compounding process can be avoided.

The invention belongs to the field of preservatives, and particularly relates to a starch-based sodium percarbonate green oxygen release agent as well as a preparation method and application thereof. According to the technical scheme, the sodium percarbonate-starch composite crystal comprises a V-shaped crystal structure cavity formed by hydrophilic modified starch and fatty acid, and the V-shaped crystal structure cavity and sodium percarbonate form a stable composite crystal structure. The invention provides a novel green composite fresh-keeping oxygen slow-release agent, namely a sodium percarbonate-starch composite crystal, which can be used in multiple fields of food processing, medical treatment, environmental protection and the like, and is particularly suitable for application environments needing continuous and controllable high-concentration oxygen release.

An anti-slagging and anti-nodulation converting furnace system comprises a flash converting furnace (1) and a waste heat boiler (2), the flash converting furnace (1) is composed of a reaction tower (3), a sedimentation tank (4) and an exhaust flue (5), and the converting furnace system is characterized in that a slag blocking plate (6), a slag blocking sieve (7) and a water cooling hanging screen (8) are sequentially arranged in the exhaust flue from bottom to top; the water-cooling hanging screen (8) comprises a plurality of groups of heat exchange tubes (81) which are vertically arranged; wherein the surfaces of the slag blocking plate (6), the slag blocking sieve (7), a heat exchange pipe (81) of the water-cooling hanging screen (8) and the exhaust flue furnace lining (51) are coated with composite crystal films. According to the converting furnace system disclosed by the utility model, about 85% of fusible particles can be blocked or gathered in the exhaust flue, and are vibrated by the dust removal device to fall into slag. Over-temperature and pipe explosion accidents of the waste heat boiler are prevented, and long-period safe and stable operation of the flash furnace and the waste heat boiler is guaranteed.

The invention relates to an array substrate and a preparation method thereof, a display panel and a display device.The array substrate comprises a substrate and an array layer, the array layer comprises a composite transistor, and the composite transistor comprises a first function part, a second function part and a control end; the first function part is arranged on the substrate, and the second function part is arranged on the side, away from the substrate, of the first function part; wherein the first function part comprises a first electrode part, a first active layer and a first insulating layer located between the first active layer and the control end, and the second function part comprises a second electrode part, a second active layer and a second insulating layer located between the second active layer and the control end. The first electrode portion is connected with the first active layer and the second electrode portion is connected with the second active layer, and one of the first insulating layer and the second insulating layer includes a storage layer configured to store a charge. According to the scheme, the layout area occupied by the transistor with the storage function can be reduced, the display pixel density is improved, and the influence on the display performance is reduced.

The invention relates to the technical field of glass ceramics, and discloses a transparent glass ceramic, a preparation method thereof and a reinforced transparent glass ceramic. The crystal phase of the transparent glass ceramic is one or a composite crystal phase of more of sodium nepheline, triclinic nepheline, eucryptite, beta quartz solid solution and zirconium oxide; the overall crystallinity R of the transparent glass ceramic accounts for 20-70% of the total mass; when R is larger than or equal to 60%, the total crystal phase proportion M of the sodium nepheline and the triclinic nepheline and the crystal phase proportion N of the eucryptite meet the condition that M / N is larger than or equal to 0.75 and smaller than or equal to 4, and the average light transmittance T of the transparent glass ceramic in the visible light wave band of 400-700 nm is larger than or equal to 88%, the haze H is smaller than or equal to 0.18%, and B is smaller than or equal to 1.4. According to the invention, the variety of the crystal phase and the proportion of the overall crystallinity are controlled, so that the transparent glass ceramic has very high transmittance in a visible light wave band, and also has relatively good mechanical properties.

The invention discloses a complex-phase alumina fiber and a preparation method thereof, and belongs to the technical field of ceramic fiber, the preparation method comprises the following steps: spinning, drying and heat treatment; spinning: performing dry spinning on the alumina spinning sol to obtain alumina gel fibers; the crystal phase of the complex-phase alumina fiber is one of a composite crystal phase of mullite and gamma-alumina or a composite crystal phase of mullite and alpha-alumina; according to the preparation method disclosed by the invention, the ceramic yield is improved, the problem of high phase transition temperature of gel fiber mullite is solved, and the prepared complex-phase alumina fiber is good in mechanical property and temperature resistance.

The invention discloses a preparation method of in-situ solidified soil of modified semi-hydrated phosphogypsum. The preparation method comprises the following steps: mixing pretreated phosphogypsum with a composite crystal modifier, homogenizing and retting, and calcining to obtain the modified semi-hydrated phosphogypsum; wherein the mass ratio of the alpha-type semi-hydrated phosphogypsum to the beta-type semi-hydrated phosphogypsum is controlled to be 1: (0.5-2) in the calcining process; and (2) mixing the modified semi-hydrated ardealite with a composite curing agent, uniformly mixing the obtained mixture with the pretreated in-situ soil, adding water to obtain a soil body, and performing layered compaction and maintenance on the soil body to obtain the in-situ solidified soil of the modified semi-hydrated ardealite. According to the method provided by the invention, the pretreatment process of the phosphogypsum is optimized, and the synergistic effect of the composite crystal modifier and the composite curing agent is combined, so that the soil can be quickly cured, and the cured soil is excellent in mechanical property and high in CO2 storage efficiency and heavy metal adsorption rate.

The invention discloses high-titanium blast furnace slag glass ceramics and a preparation method thereof. The method comprises the following steps: jointly melting high-titanium blast furnace slag in a high-temperature molten state and auxiliary raw materials; the high-titanium blast furnace slag glass ceramic is prepared from the following raw materials in percentage by mass: 60.0-90.0% of high-titanium blast furnace slag and 10.0-40.0% of additional raw materials, since the high-titanium blast furnace slag is rich in TiO2, the components of the high-titanium blast furnace slag can be adjusted by adding the additional raw materials to form a CaO-MgO-Al2O3-SiO2 system, and the additional ZrO2 is used as a nucleating agent and forms a composite nucleating agent together with TiO2 in the slag, so that the high-titanium blast furnace slag glass ceramic is prepared. The material is promoted to spontaneously separate out microcrystalline glass taking pyroxene as a main crystal phase in the heat treatment process; a rolling method with a heat recovery function is adopted in the forming process, waste heat of molten slag can be fully utilized, heat energy is provided for crystallization and nucleation of the microcrystalline glass, and the prepared microcrystalline glass has the advantages of being good in chemical stability, high in mechanical property, high in abrasion resistance and the like and is widely applied to the fields of buildings, home furnishing, electronics, chemical engineering, automobiles and the like.

The invention belongs to the technical field of electrochemical energy storage materials, and discloses a high-capacity sodium ion battery positive electrode material based on a P2-O3 composite phase and a preparation method and application thereof. The chemical general formula of the positive electrode material is Na [mu] Li [v] Mg [gamma] Ni [x] Mn [z] TMyO2, wherein [mu] is greater than or equal to 0.75 and less than or equal to 0.85, [v] is greater than or equal to 0.05 and less than or equal to 0.15, [gamma] is greater than or equal to 0.01 and less than or equal to 0.10, x is greater than or equal to 0.20 and less than or equal to 0.30, z is greater than or equal to 0.55 and less than or equal to 0.70, y is greater than or equal to 0.005 and less than or equal to 0.05, and [v] + [gamma] + x + z + y And TM is a combination of at least two elements selected from 3d, 4d and 5d transition metal elements and / or lanthanide series metal elements. The material has a composite crystal structure in which a P2 phase and an O3 phase coexist. The high-capacity sodium-ion battery positive electrode material based on the P2-O3 composite phase has relatively high specific capacity and good cycling stability, and can be used for a sodium-ion battery.

The invention belongs to the technical field of calcium carbonate preparation, and specifically provides a method for preparing low-viscosity calcium carbonate, comprising S1 carbonization and crystal surface control, wherein alkylphenol polyoxyethylene ether and dimethylformamide are added to calcium hydroxide slurry as composite crystal form control agents, the pH value is controlled in a weak alkaline environment, a primary carbonization is performed, and then aging-secondary carbonization is performed until the pH value is stabilized at 7.0-7.5; S2 wet graft modification, wherein a multifunctional group monomer is added to the slurry after the secondary carbonization, and the mixture is reacted at 60-65°C for 1.5-2.5 hours. A modified slurry is obtained, and itaconic acid and an initiator are added. The temperature is maintained at 70-85°C under an inert gas atmosphere, and the reaction time is 3.5 hours to 4.5 hours. S3 microwave-ultrasonic synergistic drying is performed, and the modified slurry is dehydrated to a solid content of 40%-50% by a centrifuge, and then dried using a microwave frequency of 2.45 GHz and an ultrasonic frequency of 20 kHz to obtain a dried product. S4 The dried product is crushed and classified, and a secondary surface modification is performed. The obtained calcium carbonate product has very low viscosity and oil absorption.

The present invention provides a method for preparing a multi-level porous iron-based catalyst, comprising the steps of: synthesizing iron hydroxide composite crystals, using soluble iron salt as raw material, synthesizing iron hydroxide composite crystals by template method and hydrothermal synthesis method; calcination treatment, first grinding the iron hydroxide composite crystals, and then high-temperature calcination treatment to obtain a multi-level porous iron-based catalyst. The present invention also provides a multi-level porous iron-based catalyst prepared by the above method. The present invention also provides an application of the above multi-level porous iron-based catalyst in the preparation of methane. The above multi-level porous iron-based catalyst is based on a traditional iron-based catalyst, and a template agent is introduced to form a multi-level pore structure to form a unique pore structure. The pore structure limits the generation of high-carbon molecules, thereby greatly improving the selectivity of methane.

Provided is a preparation method for a composite substrate. The preparation method comprises the following steps: (1) growing a crystal layer on one surface of a single-crystal substrate which is used as a seed crystal to obtain a composite crystal layer structure consisting of the single-crystal substrate and the crystal layer; and (2) subjecting the composite crystal layer structure to laser irradiation to form a modified layer inside the single-crystal substrate of the composite crystal layer structure; dividing the single-crystal substrate along the modified layer by applying an external force to obtain a composite substrate. In the preparation method of the present application, by growing a low-quality crystal layer on a high-quality single-crystal substrate and then using a laser cold-cracking cutting process, the composite substrate has high preparation efficiency, good quality, and wide application range.

The invention belongs to the technical field of fiber plasterboards, and discloses a light high-strength fiber plasterboard based on alpha-semi-hydrated gypsum and a preparation method of the light high-strength fiber plasterboard. The raw materials comprise alpha-semi-hydrated gypsum, a thixotropic agent, a light filler, polypropylene fibers, glass fibers, a titanate coupling agent and water. The main raw material alpha-semi-hydrated gypsum is prepared from phosphogypsum as a raw material through the composite crystal modifier under the normal pressure condition, the crystal is in a hexagonal short column shape, the crystal face is complete, the length-diameter ratio is about 1, the mechanical property is excellent, and the prepared gypsum board is high in compressive strength and breaking strength. In addition, the coupling agent is used for modifying the composite fiber, so that the hydrophobic property of the gypsum board is improved, meanwhile, the compatibility of the fiber and the alpha-semi-hydrated gypsum is also improved, and the mechanical property of the gypsum board is further improved.

The invention discloses a cobalt-free lithium-rich ultrahigh-nickel positive electrode material with a composite crystal domain structure and a preparation method, and belongs to the field of lithium battery positive electrode materials. The positive electrode material with the composite crystal domain structure is composed of LiNiaMbMn (1-a-b) O2 with an R-3m space group and Li2MnO3 with a C2 / m space group, the Li2MnO3 crystal domain can effectively inhibit the aggravation of the lithium-nickel mixing degree of the cobalt-free ultrahigh nickel positive electrode material caused by cobalt removal, and the conversion of the positive electrode material structure from a layered phase to a disordered rock salt phase is slowed down; meanwhile, the Li2MnO3 crystal domain with a stable structure inhibits severe unit cell volume change caused by phase structure transformation in the electrochemical cycle process of the cobalt-free ultra-high nickel positive electrode material, stress and strain accumulation is reduced, microcracks in the material are further effectively inhibited, and the cycle stability and thermal stability of the cobalt-free ultra-high nickel positive electrode material are improved.

The application discloses a solid waste-based green nano composite crystal seed early strength agent and a preparation method thereof, and relates to a green and environment-friendly crystal seed early strength agent.The solid waste-based green nano composite crystal seed early strength agent comprises the following raw materials in parts by weight: 200-300 parts of deionized water, 100-150 parts of a dispersing agent, 200-300 parts of a Ca(NO3)2 solution, 100-200 parts of a Na2CO3 solution, 50-100 parts of steel slag powder and 50-140 parts of waste concrete recycled micro powder.The solid waste-based green nano composite crystal seed early strength agent disclosed by the application uses the steel slag powder and the waste concrete recycled micro powder as raw materials, is low in cost, reduces the environmental pollution caused by solid waste, is green and environment-friendly, and is simple in process.

The application relates to the technical field of nanocomposites, in particular to a kind of macromolecule@cuprous oxide composite crystal particles and a preparation method thereof.The specific technical scheme is as follows: a kind of macromolecule@cuprous oxide composite crystal particles, the composite crystal particles take macromolecule nanoparticle as guest particle, cuprous oxide as host crystal, make the guest particle disperse in the host crystal and form macromolecule@cuprous oxide composite crystal particles, solve the problem of oxygen vacancy defect distribution regulation in cuprous oxide crystal.

The invention relates to the technical field of nano composite materials, in particular to a gold nanoparticle and zinc oxide composite crystal particle and a preparation method thereof. The preparation method comprises the following steps: dispersing gold nanoparticles with stable polymers and a diblock polymer in a zinc oxide precursor solution, uniformly mixing, and reacting to form gold nanoparticle-zinc oxide composite crystal particles; according to the composite crystal particle, polymer-stable gold nanoparticles are used as object particles, zinc oxide is used as a main crystal, a diblock polymer is used as a crystal growth regulator, and the object particles are dispersed in the main crystal to form the gold nanoparticle and zinc oxide composite crystal particle with uniform size and morphology, so that the problems that the morphology and the size of zinc oxide are not uniform; and moreover, the composite crystal has excellent photocatalytic performance.

The invention relates to a method for realizing bonding growth of rare earth doped fluoride and pure fluoride crystals, and belongs to the technical field of crystal growth. Aiming at the technical problems of high requirement on polishing quality of a pre-bonding surface, sudden change of refractive index of a bonding interface, limited bonding area and the like in the existing crystal bonding method, one of a pure fluoride host crystal or a rare earth doped fluoride crystal is selected as a seed crystal; then weighing and mixing the raw materials according to the stoichiometric ratio of another bonded crystal component, pressing the raw materials into a raw material block, finally putting the seed crystal and the raw material block into a crucible in sequence, and realizing the bonding growth of the rare earth doped fluoride and pure fluoride crystal by adopting a temperature gradient method or a Bridgman-Stockbarger method. And finally obtaining the composite crystal formed by bonding the pure fluoride crystal and the rare earth ion doped fluoride crystal. According to the composite crystal grown by the method, sudden change of the refractive index at the bonding interface is avoided, the preparation cost of the composite crystal element is reduced, and the laser performance of the bonding gain element is improved.

The present invention relates to the technical field of early strength agents, and more particularly to a kind of in-situ composite crystal seed type early strength agent and its preparation method and application. The present invention is carried out ball milling reaction by mixing calcareous raw material, siliceous raw material, quicklime and dispersant and water, and then spray drying to obtain an in-situ composite crystal seed type early strength agent. The constituent components of the in-situ composite crystal seed type early strength agent include sodium sulfate and C-S-H seed crystals. The in-situ composite crystal seed type early strength agent of the present invention is reasonable in composition, can play the synergistic effect (1+1>2) of C-S-H seed crystals and traditional early strength agents, is applied to large-volume slag cement, and early strength effect is remarkable, and late-stage strength does not shrink. The preparation process of the present invention is simple, raw materials are cheap and easy to obtain, and cost is low, seed particle size is small and particle size distribution is uniform, performance is relatively stable, and it is easy to store, transport and use, and is very suitable for industrialized mass production.

The invention relates to a single crystal and directional column crystal composite crystal blade and a preparation method thereof, belongs to the field of precision casting, and solves the problems of single and uncontrollable orientation of a single crystal part, uncontrollable secondary orientation of the single crystal part, uncontrollable secondary orientation of the single crystal part and uncontrollable secondary orientation of the single crystal part in the single crystal and directional column crystal composite blade obtained by the existing preparation method. The crystal orientation, the grain boundary direction and the grain width change greatly. The preparation method of the single crystal and directional column crystal composite crystal blade comprises the following steps: S1, preparing a composite seed crystal; s2, preparing a mold shell; s3, placing the composite seed crystal in a seed crystal cavity of the mold shell; through directional solidification, the single crystal and directional column crystal composite crystal blade is prepared. According to the method, the orientation of the single crystal part in the single crystal and oriented column crystal composite blade can be regulated and controlled and is not limited to [001] oriented grains, secondary orientation is effectively controlled, and the crystal orientation, the grain boundary direction and the grain width in the composite blade can be more accurately controlled.

The invention provides colorful metal glaze, a preparation method thereof and a ceramic product, and belongs to the technical field of ceramic materials. The colorful metal glaze comprises basic glaze, a nano composite nucleating agent, a metal coloring agent and a rare earth toner, the nano composite nucleation agent is a nano particle with a core-shell structure. The ceramic product prepared by the invention has stable, uniform and strong metallic luster and lasting color, not only solves the problems of strong color development dependence, insufficient glaze surface stability, poor component synergism and the like of the existing metal glaze, but also improves the quality and artistic value of the ceramic product, and has wide market application prospects.

The present invention provides a composite crystal domain sodium-based cathode material and a preparation method thereof, a cathode electrode sheet, a battery and an electrical device. The composite crystal domain sodium-based cathode material has the general chemical formula of Na 1‑ a Ni b Fe c Mn d X x O2, 0<a≤0.25, b+c+d+x=1, X is a metal element with an average valence σ≤4; layered crystal domains A and B exist within the crystal structure; and the absolute value of microstress ε in the crystal structure is less than 10%. The composite crystal domain sodium cathode material provided by the present invention ensures that the material has a higher energy density by regulating the sodium content, material composition, valence, and X element doping, introduces other ions to provide charge compensation, and regulates the structure and coupling of crystal domains A and B. This reduces stress accumulation and lattice strain caused by uneven expansion in the material's bulk structure, increases the formation and migration barriers of oxygen vacancies in the structure, improves the stability of lattice oxygen in the material, and slows down voltage and capacity decay.

The invention provides a composite crystal modifier and a preparation method of alpha type semi-hydrated gypsum. According to the preparation method of the alpha-type semi-hydrated gypsum, the composite crystal modifier, the industrial byproduct ardealite and the salt-alcohol mixed solution are adopted, the alpha-type semi-hydrated gypsum is prepared by adopting a normal-pressure solution method, the prepared alpha-type semi-hydrated gypsum is good in crystal transformation, excellent in product quality, simple in process, high in efficiency and low in energy consumption, the ardealite waste can be utilized, and the production cost is reduced. Resource circulation is realized; according to the present invention, the short column-shaped alpha-type semi-hydrated gypsum crystal can be prepared, and the drying compressive strength can achieve 30.56-35.15 Mpa, the a25-grade product in the building material industry national standard JCT 20382010 alpha-type high-strength gypsum standard can be prepared at the low temperature within the short time, and the advantage of the standard product preparation with the low energy consumption is prominent.