68results about How to "Stable crystal structure" patented technology

The invention provides a sodium ferric pyrophosphate positive electrode material cooperatively doped with anions and cations, a preparation method of the sodium ferric pyrophosphate positive electrode material and a sodium ion battery, and relates to the field of sodium ion batteries. The anion and cation synergistically doped ferric sodium phosphate pyrophosphate positive electrode material comprises an inner core and a coating layer covering the outer surface of the inner core, the inner core comprises ferric sodium phosphate pyrophosphate, the coating layer comprises carbon, the chemical formula of the ferric sodium phosphate pyrophosphate is Na4-2yFe2.91-xQx (PO4) 2-yP2O7Fy, x is more than 0 and less than or equal to 0.3, and y is more than or equal to 0.03 and less than or equal to 0.08; q comprises at least one of Sn, Ni, Cu, Mg and Mn. The introduced Q positive ions and F negative ions can keep the crystal structure of the body material stable, and the positive ions and the negative ions have a synergistic effect, so that the band gap of the positive electrode material is reduced, the state density near the Fermi level of the positive electrode material is increased, the conductivity of the positive electrode material is enhanced, the specific capacity of the positive electrode material is improved, and the rate and the cycle performance are promoted.

The invention belongs to but not limited to the technical field of electrode materials, and particularly relates to a high-tap-density lithium nickel manganese oxide positive electrode material, a preparation method and a lithium ion battery, the chemical general formula of the high-tap-density lithium nickel manganese oxide positive electrode material is LiNi < 0.5-x > Mn < 1.5-y > M < x > N < y > O < 4 >, 0.1, 0 < = y < lt >; 0.1, M and N are doping elements and comprise one or more of Mg, Co, Al, Zr, W, Sb, Ta and Ti; the material is micron-sized spherical secondary particles formed by stacking and aggregating nano-sized octahedral primary particles, and is uniformly dispersed without agglomeration; the spherical secondary particles are formed by mixing spherical secondary particles with large and small particle size distribution, and the average particle size range of the large particles is 3lt; d < 50lt >; the average particle size range of the small particles is 1lt; d < 50lt >; 2 [mu] m.

The invention relates to the technical field of sodium ion batteries, in particular to a sodium ferric sulfate positive electrode material and a preparation method and application thereof. The preparation method of the sodium ferric sulfate positive electrode material comprises the following steps: obtaining a carbon foam substrate; weighing raw materials according to the stoichiometric ratio of the sodium ferric sulfate positive electrode material, and adding the raw materials into a solvent to obtain a mixed solution; depositing the mixed solution on a carbon foam substrate by adopting an electrostatic spray deposition method to obtain a precursor film; and sintering the precursor film to obtain the sodium ferric sulfate positive electrode material. According to the preparation method, the carbon foam is adopted as a substrate material, the sodium ferric sulfate precursor is prepared through electrostatic spray deposition, and then the sodium ferric sulfate material is obtained through sintering treatment, so that the specific discharge capacity, the rate capability and the cycle performance of the sodium ferric sulfate material are all remarkably improved.

The invention relates to the technical field of battery materials, and discloses a lithium cobalt oxide composite positive electrode material with a coating layer, a preparation method thereof, a positive electrode and a battery. The lithium cobalt oxide composite positive electrode material with the coating layer comprises a main body and the coating layer coated outside the main body, the chemical formula of the main body is LixNayCo1-zMzO2, x is more than or equal to 0.7 and less than or equal to 0.74, y is more than 0 and less than or equal to 0.1, z is more than or equal to 0 and less than or equal to 0.1, and M is selected from at least one of Al, Mg, W, Ti, La, Zr, Y, Ni, Mn and Nb; the coating layer is a metal oxide; and a crystal phase in the main body is a T2 and O2 composite phase. The preparation method comprises the following steps: firstly preparing a P2-phase sodium cobalt oxide precursor, coating the precursor, and then carrying out ion exchange with a lithium source mixed molten salt to finally obtain the composite positive electrode material of T2 and O2 composite phase lithium cobalt oxide with a coating layer. The positive electrode material has good electrochemical performance.

The invention relates to a composite positive active material and a preparation method thereof, a positive pole piece and a secondary battery. The composite positive electrode active material comprises a positive electrode active material substrate, a porous metal oxide coating layer arranged on the surface of the positive electrode active material substrate and a conductive polymer coating layer arranged on the surface of the porous metal oxide coating layer. In the composite positive electrode active material, the electrochemical inert porous metal oxide coating layer has good thermal stability and is beneficial to stabilization of a crystal structure and inhibition of surface side reaction, and in addition, the porous structure is beneficial to transmission of lithium ions and storage of oxygen free radicals separated out due to structural collapse of a positive electrode active material matrix in the overcharge process; severe reaction with electrolyte is relieved, and overcharge failure of the positive electrode active material is slowed down. The conductive polymer coating layer can make up the electrochemical inertness of the metal oxide and improve the electronic conductivity of the positive electrode active material.

The invention discloses an iron-based positive electrode lithium supplementing material, a preparation method thereof, a positive electrode material and an iron-based positive electrode lithium supplementing material, the iron-based positive electrode lithium supplementing material comprises a base material, doping elements and a coating layer, the base material is Li5FeO4, the doping elements are Co and Sr, and the coating layer is a carbon coating layer coating the surface of the Li5FeO4 base material. The prepared positive electrode lithium supplementing material has the advantages of stable structure, good conductivity and excellent air stability.

The invention belongs to the technical field of sodium ion batteries, and discloses a preparation method of an ion-doped low-nickel layered oxide sodium ion battery positive electrode material. The chemical formula of the sodium ion battery positive electrode material is Na < 0.95-x > Ca < x > (Ni < 0.2 > Fe < 0.4 > Mn < 0.4 >) < 1-y-z > Li < y > Mg < z > O < 2 >. The preparation method comprises the following steps: weighing a sodium source, a nickel-iron-manganese hydroxide, a calcium source, a lithium source, a magnesium source and a certain amount of a dispersing agent in a ball-milling tank, and carrying out ball-milling mixing to obtain a sodium-ion battery positive electrode material precursor; and placing the sodium ion battery positive electrode material precursor in a corundum crucible, transferring the corundum crucible to a box-type atmosphere furnace for segmented sintering, naturally cooling to room temperature after sintering is completed, and grinding and sieving to obtain the ion-doped low-nickel layered oxide sodium ion battery positive electrode material. The positive electrode material has the advantages of low cost, low strain, high capacity, good cycle stability, simple preparation process, high repeatability and great potential of large-scale production.

The invention discloses a high-entropy porous ferric sodium phosphate pyrophosphate positive electrode material and a preparation method thereof, and belongs to the technical field of sodium ion battery positive electrode materials, the positive electrode material takes ferric sodium phosphate pyrophosphate-transition metal as a base material, and the surface is coated with a carbon layer; the specific surface area of the high-entropy porous ferric sodium pyrophosphate positive electrode material is 20-30m < 2 > / g; the chemical formula of the ferric sodium pyrophosphate-transition metal is Na < 4 > Fe < 3-x > M < x > (PO4) < 2 > P < 2 > O < 7 >, the transition metal M comprises at least five of Ti, Cr, Mn, Co, Ni, Cu, Zn, Y, Zr, Ag and Mo. The high-entropy porous ferric sodium phosphate pyrophosphate positive electrode material is prepared by adopting high-entropy porous construction and interface carbon coating synergistic treatment for the first time, so that the structural stability and the specific surface area of the ferric sodium phosphate pyrophosphate are greatly improved; compared with other ferric sodium phosphate pyrophosphate, the high-entropy porous ferric sodium phosphate pyrophosphate is higher in electron transmission speed, shorter in ion diffusion distance, richer in electroactive reaction sites, high in gram volume, stable in electrochemical performance and excellent in rate capability.

The invention relates to the technical field of lithium ion battery materials, in particular to a coated lithium cobalt oxide positive electrode material and a positive electrode plate prepared from the coated lithium cobalt oxide positive electrode material. A binder with dynamic reversible bonds such as a hydrogen bond and a disulfide bond is synthesized through free radical polymerization among acrylamide, acrylic acid and a double-bond-terminated disulfide bond-containing compound; the preparation method comprises the following steps: doping lithium cobalt oxide with Mg, coating the surface of the lithium cobalt oxide with a conductive polymer polypyrrole, and coating the surface of the lithium cobalt oxide with an organic porous polymer prepared from a quaternary connector 5, 10, 15, 20-tetra (4-aminophenyl) porphyrin and pyromellitic dianhydride by using a large pi bond of the polypyrrole; the conductive agent is modified, (3-mercaptopropyl) trimethoxysilane is firstly used for sulfhydrylation, then sulfydryl-double bond light click is utilized, and a double-bond end-capped disulfide bond-containing compound with a reversible bond is grafted, so that the stability and the safety of the battery performance are improved.

The invention discloses 3-hydroxybutyric acid betaine salt, which has the following molecular structure: # imgabs0 #, in which Mn < + > is a metal ion selected from Na < + >, K < + >, Mg < 2 + > and Ca < 2 + >; n + is the number of charges and represents 1-2 positive charges. The betaine 3-hydroxybutyrate salt is used as a food additive and a pharmaceutical active ingredient for relieving or preventing fatty liver. The invention also discloses a preparation method of the 3-hydroxybutyric acid betaine salt.

The invention belongs to the technical field of new energy materials, and particularly relates to a sodium ion battery positive electrode material and a preparation method and application thereof. The sodium ion battery positive electrode material is a P2-phase high-entropy layered transition metal oxide, and the preparation method comprises the following steps: (1) uniformly dispersing acetate in deionized water or ultrapure water to obtain a solution A; (2) dissolving oxalic acid dihydrate in deionized water or ultrapure water to obtain a solution B; (3) in a heating and stirring state, slowly dropwise adding the solution A into the solution B, and heating and stirring in a water bath until the solution is dried by distillation; (4) carrying out vacuum drying on the evaporated sample, and grinding to obtain precursor powder; and (5) calcining the precursor powder, and then naturally cooling to room temperature to obtain the sodium ion battery positive electrode material. The preparation method disclosed by the invention is simple to operate, effectively solves the problems of unstable structure and poorer cycle and rate capability of the sodium-ion battery positive electrode material in the charge-discharge cycle process, and has a wide application prospect.

The invention belongs to the field of nuclear engineering, and particularly relates to a construction method and an evaluation method of an alloy phase boundary / grain boundary irradiation damage behavior model, and the method comprises the following steps: obtaining a crystal face and a crystal face included angle of alpha-Mg in AZ31 according to an EBSD result graph of AZ31, obtaining crystal faces and crystal face included angles of (1100) Mg and (200) Li according to a TEM result graph of LZ91, and constructing a phase boundary interface model of alpha-Mg and beta-Li; s2, building a surface model through the crystal face obtained in the step S1, obtaining the number of surface atomic layers, adding a vacuum isolation layer on the surface model, carrying out a convergence test on the surface model, and respectively building interface models of the AZ31 magnesium alloy and the LZ91 magnesium-lithium alloy through obtained results; and S3, an Mg vacancy, a Li vacancy, an Mg vacancy and a Li vacancy are doped in the interface model obtained in the S2, and an alloy phase boundary / grain boundary irradiation damage behavior model is constructed.

The invention discloses a vanadium positive electrode material with a high-stability crystal face structure and a preparation method thereof, and belongs to the technical field of zinc ion batteries, and the preparation method comprises the following steps: step S1, adding vanadium pentoxide powder into a beaker, then adding deionized water, stirring and mixing, then adding zinc sulfate and anthraquinone-2-sodium sulfonate, stirring and mixing, and then adding sodium hydroxide, stirring and mixing; finally adding hydrogen peroxide, stirring and mixing to obtain a modified solution; and S2, adding the modification solution into a reaction kettle, then adding the pretreated carbon cloth, immersing the pretreated carbon cloth into the modification solution, carrying out hydrothermal reaction, reducing the pressure, cooling to room temperature, washing with water for multiple times, and drying to obtain the vanadium positive electrode material with the high-stability crystal face structure, through pre-intercalation of zinc ions and synergistic anchoring of anthraquinone-2-sodium sulfonate, the ion migration rate of the positive electrode material is improved, meanwhile, a stable crystal space structure is formed, a wide-area and stable microscopic channel is provided in the ion intercalation-deintercalation process, and the zinc storage rate performance and the cycle stability are enhanced.

This invention relates to a boron-doped multi-element polyanionic sodium-ion battery cathode material and its preparation method, comprising the following steps: [The method involves] mixing Na₄Fe₂O₃ with... 3‑X B X (PO4) 2‑Y (SiO4) Y The stoichiometric ratio of P2O7 is determined by adding ferrous source, boric acid, sodium source, phosphorus source, and silicon source to water, followed by the addition of carbon source and mixing thoroughly to obtain a mixed slurry; wherein 0.2≤X≤0.5, 0<Y≤1; the mixed slurry is then ground to obtain a sand-milled slurry; the sand-milled slurry is dried to obtain precursor powder; under a protective atmosphere, the precursor powder is sintered at 450~550℃ to obtain boron-doped multi-element polyanion sodium-ion battery cathode material. The introduction of boron and silicon elements in this invention helps reduce raw material costs, improve the electrochemical performance of the material, especially enhancing the structural stability, rate performance, and cycle life of the cathode material, and also lowers the sintering temperature, meeting the requirements for cost reduction and efficiency improvement.

A rare earth organic tetrahedral molecular cage complex and a preparation method and application thereof are constructed with rare earth europium (III) as the vertex, triphenylamine-derived tripodal β-diketone as the face-directing ligand and 1,10-phenanthroline as the auxiliary ligand. The complex is modified by Pluronic F127 to obtain a composite material containing a rare earth organic tetrahedral molecular cage complex structure, and the application of the composite material as an inner ear drug carrier delivery system in the treatment of inner ear diseases. The complex of the present invention provides a cavity with a suitable capacity for accommodating guest molecules, and has high light efficiency to facilitate the tracing of drug carriers, and can efficiently penetrate the cochlear blood-membrane labyrinth barrier to enter the endolymph, and then be taken up by inner ear sensory cells. The Pluronic F127-modified rare earth cage complex synthesized by the present invention can be used as a safe and efficient inner ear drug delivery carrier, with great clinical value and application prospects.

The invention relates to the technical field of cable preparation, in particular to a breakage-resistant photoelectric composite cable for wiring in a narrow space. Comprising a composite crosslinked polyethylene cable protection layer and an optical cable, and the composite crosslinked polyethylene cable protection layer comprises the following components in percentage by mass: 16-18% of precursor powder, 5-6% of a charring agent, 74.6-78% of PE, 0.6-0.8% of triallyl cyanate and 0.4-0.6% of dicumyl peroxide. The cerium nitrate, the yttrium nitrate and the sodium stannate are compounded to prepare the spherical rare earth nano material, and yttrium ions of the yttrium nitrate and the sodium stannate can finally form a crystal material with an approximately spherical polyhedral structure, so that the mechanical property of the composite crosslinked polyethylene cable protection layer is improved; according to the present invention, the composite material is not easily layered and cracked under the long-time pressure bearing condition, the microstructure of the composite material is changed so as to achieve the more compact structure, and the pressure resistance is improved to a certain extent.

The invention discloses a cobalt-free lithium-rich manganese-based oxide material for a lithium ion battery and a preparation method thereof.The preparation method comprises the steps that a lithium source and a precursor in a preset proportion are mixed and ball-milled to obtain a mixture, and then the mixture is subjected to first calcination to obtain a first reactant; the first reactant is soaked in a citric acid ethanol solution, magnetic stirring is carried out at the same time, the soaked first reactant is subjected to second calcination, and a second reactant with the surface coated with a spinel phase is obtained; mixing and stirring a second reactant and an aluminum source according to a preset proportion, and performing third calcination on the stirred second reactant to enable the aluminum element to enter a lattice structure of the second reactant to obtain a third reactant; and calcining the carbon source and the third reactant together to obtain the cobalt-free lithium-rich manganese-based oxide material for the lithium ion battery coated with the carbon layer. The cobalt-free lithium-rich manganese-based oxide material for the lithium ion battery, which is obtained by the method, shows better cycling stability.

The invention provides a lithium manganate positive electrode material and a preparation method thereof, a positive plate and a battery, and belongs to the technical field of batteries, the structural general formula of the lithium manganate positive electrode material is Li1 + xMyMn2-(x + y) O4, x is greater than or equal to 0.1 and less than or equal to 0.33, y is greater than or equal to 0.005 and less than or equal to 0.01, M comprises at least one of Co, Ni, Cr and Fe, and the 111 crystal face diffraction peak intensity I111 of the lithium manganate positive electrode material is greater than 3100. According to the lithium manganate positive electrode material, the energy density, the effective gram volume and the structural stability of the lithium manganate positive electrode material, especially the performance of the lithium manganate positive electrode material in a low-voltage range of 2.0-3.3 V, are improved through lithium enrichment, doping of a proper proportion of M elements and synergistic cooperation of 111 crystal face diffraction peak intensity of the lithium manganate positive electrode material, so that the energy density, the effective gram volume and the cycling stability of the battery are improved, and the battery performance is improved. The battery service life is prolonged.

The invention provides a Prussian white material and a preparation method thereof, a positive plate, a battery and electric equipment. The Prussian white material comprises an inner core and a first shell coating the surface of the inner core, the composition of the inner core is NaxMn [Fe (CN) 6] y.alphaH2O, x is greater than or equal to 1 and less than or equal to 1.8, y is greater than or equal to 0.9 and less than or equal to 0.99, and alpha is greater than or equal to 1 and less than or equal to 3; the composition of the first shell is NaaMnbNi1-b [Fe (CN) 6] c.betaH2O, 1.2 < = a < = 1.8, 0.8 < = b < = 0.995, 0.8 < = c < = 0.99, and 0.5 < = beta < = 3. The surface of the pure manganese-based Prussian white material is coated with the manganese-based Prussian white material shell doped with the nickel element, so that the crystal structure of the material can be stabilized, the ginger Taylor phenomenon is inhibited, the overall stability of the material is enhanced, and the material has high capacity and excellent cycle stability.

The invention provides an efficient and economical industrial flue gas electrochemical carbon capture (direct electroconversion of carbon dioxide) catalytic electrode. The electrode is based on selenide, the structure and surface characteristics are optimized through fine treatment, and the electrocatalytic reduction performance of carbon dioxide in industrial flue gas is remarkably improved. In the application, the prepared electrode has a unique oxygen isolation function, avoids the adverse effect of oxygen reduction reaction, shows an excellent carbon capture effect, and can efficiently convert the captured carbon dioxide into chemical products or fuels (such as ethanol, acetic acid and the like) with additional values. In addition, the electrode has good stability, can maintain catalytic performance in long-term use, and meets industrial application requirements. The invention provides an effective electrochemical carbon capture method for reducing the carbon footprint caused by the use of fossil fuel, and has important significance for inhibiting the increase of greenhouse gases and promoting the development of a carbon capture, utilization and sequestration (CCUS) technology.

The invention discloses a high-temperature fire-resistant heat-insulation carbon fiber composite material which comprises the following components in parts by weight: 35-50 parts of wollastonite-feldspar composite powder, 25-35 parts of modified porous mullite aggregate, 12-20 parts of calcium aluminate cement, 2-8 parts of modified short carbon fibers, 1.5-2.5 parts of sodium dodecyl benzene sulfonate and 1-2 parts of sodium tripolyphosphate. The preparation method comprises the following steps: S1, weighing the wollastonite-feldspar composite powder, the modified porous mullite aggregate, the calcium aluminate cement and the modified short carbon fibers in proportion, and carrying out dry mixing; s2, adding water into sodium dodecyl benzene sulfonate and sodium tripolyphosphate, and stirring to obtain an auxiliary agent aqueous solution; s3, adding the auxiliary agent aqueous solution into the dry powder mixture, and stirring; s4, transferring the slurry into a mold for hydraulic forming; s5, the formed blank is subjected to curing, demolding, drying, high-temperature sintering and cooling, and the high-temperature fire-resistant heat-insulation carbon fiber composite material is obtained. The fire-resistant and heat-insulating carbon fiber composite material produced by the invention can improve the high temperature resistance and compression strength.

The invention provides a preparation method and application of a cathode material, and the preparation method of the cathode material comprises the following steps: weighing raw materials of a vanadium source, a phosphorus source, a potassium source and a rare earth element source, then adding water for dissolving, drying, calcining and ball-milling to obtain a rare earth element doped cathode material. The cathode material is high in energy density, stable in structure and good in conductivity, and the cycle performance of the battery can be improved. Particularly, a K < + > diffusion channel of the cathode material is obviously enlarged, and the cathode material has relatively high rate capability and has profound significance in application of the cathode material of the potassium storage secondary battery.

This application relates to the field of oxide target technology, specifically disclosing an ITZO target and its preparation method. The preparation method of the ITZO target includes the following steps: applying an In-containing... 3+ Sn 4+ Zn 2+ A complexing agent is added to the solution to obtain a mixed solution; the mixed solution is then added dropwise to an ammonia solution and aged to obtain a precursor precipitate; the precursor precipitate is then subjected to spray pyrolysis, cold isostatic pressing, and warm isostatic pressing to obtain an ITZO preform; the ITZO preform is then subjected to programmed temperature calcination and programmed temperature cooling to obtain an ITZO target. This application obtains a uniformly composed and highly dense ITZO target by dynamically controlling the composition of the mixed gas during the programmed temperature cooling process through two static pressing treatments; using this target, a transparent conductive film with high visible light transmittance and excellent electrical properties can be prepared by sputtering, solving the technical problems of uneven composition, low density, and poor quality of sputtered films in existing targets.

A hydrophilic gadolinium hydroxide nanosheet and a preparation method thereof. The hydrophilic gadolinium hydroxide nanosheet comprises, by mass percentage, 32.0%-40.0% of gadolinium oxide nanoparticles and 60.0%-68.0% of a silane coupling agent. The preparation method comprises: dissolving gadolinium oxide nanoparticles in deionized water to obtain a milky white dispersion A, reacting the milky white dispersion A with a diluted silane coupling agent with a pH adjusted to obtain a liquid B, and reacting the liquid B with a pretreated cation exchange resin to obtain clarified hydrophilic gadolinium hydroxide nanosheets. The hydrophilic gadolinium hydroxide nanosheets have uniform size distribution, stable crystal structure, good dispersibility, and are characterized by simple preparation process, mild reaction conditions, less by-products, high yield, low equipment requirements and short preparation cycle.

The invention discloses a preparation method for preparing a lithium ion battery positive electrode material through secondary sintering, and belongs to the technical field of lithium ion batteries, the preparation method for preparing the lithium ion battery positive electrode material through secondary sintering comprises the following steps: uniformly mixing nickel-cobalt-manganese hydroxide, lithium hydroxide and a nano oxide additive; performing primary sintering to obtain a primary sintering product; the preparation method comprises the following steps: adding graphene oxide, hydroxylated carbon nanotubes and a modified silane coupling agent into an ethanol water solution with the volume fraction of 90%, and stirring for 1-2 hours to obtain a coating solution; and mixing the coating liquid with the primary sintering product, and performing secondary sintering to obtain the lithium ion battery positive electrode material. The lithium ion battery positive electrode material obtained by the invention is stable in crystal structure, low in surface residual alkali content, high in discharge capacity and good in cycling stability.

The present invention provides a multi-element, regionally doped, cobalt-free positive electrode material, which has a molecular formula of LixNiaMnbAlcMgdWeO2, wherein 0.95≤x≤1.1, 0.5≤a≤0.9, 0.1≤b≤0.5, 0<c≤0.01, 0<d<0.01, 0<e≤0.01, and a + b = 1. The positive electrode material comprises an Al-doped region, an Mg-doped region and a W-doped region in an order from the inside to the outside. Also provided is a method of preparing the positive electrode material. The cobalt-free positive electrode material of the present invention can better adapt to a stress release by the positive electrode material regionally doped with Al, Mg, and W elements, achieving a moderate adjustment and avoiding imbalance, so that the material has more stable structure, and better rate performance and cycle performance. The method of preparing the material has a simple process, is easy to implement, and can stably prepare a positive electrode material with excellent structure and performance.

The invention discloses a nickel-loaded hierarchical porous SAPO-34 catalyst and a preparation method and application thereof.The method comprises the steps that an aluminum source is added into a water solution of a phosphorus source, stirring is conducted, then a template agent and a silicon source are added, stirring and uniform mixing are conducted, and a precursor solution is prepared; carrying out hydrothermal reaction treatment on the precursor solution, and calcining a product to prepare an original SAPO-34 carrier; the preparation method comprises the following steps: putting an original SAPO-34 carrier into an organic acid solution, stirring, and drying and calcining to obtain an acid-treated SAPO-34 carrier; and adding the SAPO-34 carrier subjected to acid treatment into a Ni (NO3) 2 solution, fully stirring and uniformly mixing, drying, and carrying out heat treatment to obtain the nickel-loaded hierarchical porous SAPO-34 catalyst. The method is simple in process and reasonable in design, the catalyst has an excellent hierarchical porous structure and appropriate surface acidity, the reaction activity and selectivity of the catalyst are effectively improved, and the reaction energy efficiency is effectively improved.

The purpose of the present invention is to provide a fixed magnetic field for reducing the mixing degree of transition metal ions and active ions in transition metal-based positive electrode materials of secondary batteries, maintaining the structural stability of transition metal-based positive electrode materials of secondary batteries, changing CEI film components, and improving the density and uniformity of CEI films, as well as a method for regulating the transition metal-based positive electrode materials and CEI films of secondary batteries by magnetic fields. A fixed magnetic field is introduced during the battery charging process, the magnetic field lines of the fixed magnetic field are fixed at an angle with the positive electrode of the battery, and the active substances in the battery are fully utilized by adjusting the magnetic field strength and the period of magnetic field application, thereby improving the coulomb efficiency of the battery during the first charge and discharge process. The present invention is aimed at the existing transition metal-based positive electrode secondary battery system, and can realize an efficient, simple, and low-cost regulation process, with high repeatability and strong operability, reducing the loss of irreversible capacity of the battery and improving the overall energy density of the battery.

The invention relates to a composite diaphragm, a preparation method thereof and a battery, and belongs to the technical field of battery materials, the composite diaphragm comprises a base membrane and a coating distributed on the surface of the base membrane; the coating comprises sodium super-ionic conductor type phosphate, a single-arm carbon nano tube and a binding agent, the mass ratio of the sodium super-ion conductor type phosphate to the single-arm carbon nanotube is (20-80): 1. The composite diaphragm provided by the invention has excellent heat shrinkage resistance, electrolyte infiltration performance and liquid absorption capability, and relatively high ionic conductivity and puncture strength, and the battery comprising the composite diaphragm has relatively high capacity and excellent cycle performance.

The present invention relates to a super-fouling-resistant three-dimensional transparent glaze and a preparation process thereof, and belongs to the technical field of glaze preparation. The present invention modifies kaolin to change the surface structure and chemical properties of kaolin, thereby improving the compactness and permeability resistance of the glaze, effectively preventing the penetration and adhesion of stains, and the addition of silicon carbide and the subsequent solution intercalation modification combined with microwave radiation and roasting treatment make the crystal structure of the modified kaolin more stable, thereby enhancing the wear resistance and scratch resistance of the glaze; the present invention ensures the uniformity and fineness of the glaze components and the uniform coating of the glaze through ball milling, and adds water, sodium carboxymethyl cellulose and sodium tripolyphosphate as additives to improve the rheology and stability of the glaze, and then uses a magnetic iron remover to remove iron from the glaze, effectively avoiding the color spots and defects caused by iron oxidation in the glaze layer during the firing process, and improving the smoothness and aesthetics of the glaze layer.