61 results about "Sodium titanate" patented technology

The invention relates to a sodium ion battery, and belongs to sodium ion batteries. The battery cell of the sodium-ion battery comprises a positive plate, a negative plate and an electrolyte, the active material of the positive plate is carbon-coated aluminum-doped sodium ferric sulfate; the chemical formula of the aluminum-doped sodium ferric sulfate is Na < 2 + 2y > Fe < 2-x-y > Al < x > (SO4) 3, x is more than or equal to 0.01 and less than or equal to 0.05, and y is more than or equal to 0.1 and less than or equal to The particle size of the carbon-coated aluminum-doped sodium ferric sulfate ranges from 50 nm to 100 nm; the weight ratio of a carbon coating layer in the carbon-coated aluminum-doped sodium ferric sulfate is 1%-5%; the active material of the negative plate is carbon-coated sodium titanate; the specific surface area of the carbon-coated sodium titanate is 20 m < 2 > / g to 25 m < 2 > / g; the weight ratio of a carbon coating layer in the carbon-coated sodium titanate is 0.5%-3%. Volume expansion is jointly inhibited through structural stability of positive and negative electrode materials, and the cycle life is prolonged.

The invention discloses sodium titanate with a layered crystal structure, a preparation method of the sodium titanate and application of the sodium titanate in a water-based magnesium ion battery, and belongs to the technical field of water-based magnesium ion batteries. According to the invention, the sodium titanate with a layered crystal structure is used as the negative electrode material of the aqueous magnesium ion battery, and due to excellent chemical and structural stability, the sodium titanate can realize reversible Mg < 2 + > intercalation / deintercalation in an aqueous magnesium electrolyte. According to the invention, Na2Ti2O5 and Na2Ti3O7 materials are synthesized by a hydrothermal method and a high-temperature annealing process. In a magnesium chloride electrolyte, the two sodium titanate materials both show extremely low charge and discharge potentials (Na2Ti2O5,-1.3 to-0.6 V vs.SCE; sCE (-1.5 to-1 V vs.SCE) and relatively good cycling stability are achieved. In addition, the charge-discharge specific capacity of the Na2Ti2O5 half cell under the current density of 2A / g is up to 213mAh / g, and the high specific capacity of 150mAh / g is still kept under the high current density of 10A / g. The sodium titanate is an ideal aqueous magnesium battery negative electrode material, has the advantages of low cost and environmental friendliness, and has a great application prospect in the field of aqueous magnesium ion energy storage.

The application relates to a sodium ion battery negative electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion batteries. The sodium ion battery negative electrode material comprises sodium titanate and a composite coating layer coated on the surface of the sodium titanate, and the composite coating layer comprises titanium carbide and carbon; the mass ratio of the sodium titanate, the titanium carbide and the carbon is (70-90):(5-15):(2-10). Through the compounding of the sodium titanate and the composite coating layer (titanium carbide and carbon), the conductivity is significantly improved, the 10C capacity retention rate is increased from 30% to 70%, and the coulomb efficiency is increased from 65% to 95%.

The present invention provides a preparation method of a structure-modified sodium ion battery positive electrode material, comprising the following steps: S1, mixing a sodium source, an iron source, a phosphorus source, a first carbon source, a structure modifier, and deionized water, adding the mixture to a high-gravity reactor rotating at 25,000 to 35,000 rpm, reacting at a temperature of 80 to 100° C. for 1 to 2 h, drying, and then calcining at 400 to 650° C. for 8 to 12 h in an inert gas atmosphere to obtain a precursor, wherein the structure modifier is at least one of sodium vanadate, sodium titanate, sodium manganate, sodium cobaltate, sodium chromate, metatitanic acid, magnesium oxide, copper oxide, zinc oxide, and yttrium oxide; S2, mixing the precursor, a second carbon source, and a chelate solution, adjusting the pH to 2.5 to 4.0, grinding the mixture at a temperature of 60 to 90° C. until the D50 is less than 0.95 μm, spray drying, and calcining at 400 to 650° C. for 8 to 12 h in an inert gas atmosphere. h obtain the structure-modified sodium ion battery positive electrode material.

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 application provides a 650MPa-grade ultra-supercritical high-temperature steel welding electrode and a coating and deposited metal, and belongs to the field of welding materials.The raw material of the coating comprises, in weight parts, 39-43 parts of magnesia, 30-35 parts of fluorite, 3-5 parts of dolomite, 5-10 parts of ferrosilicon, 2-5 parts of sodium titanate, 10-15 parts of metallic chromium powder, 0.1-0.4 parts of chromium oxide green, 0.1-0.3 parts of aluminum-magnesium alloy and 1.5-2.5 parts of sodium alginate.Through the research on the composition of the coating, the sodium titanate and the aluminum-magnesium alloy are added to stabilize the electric arc, the electric arc has stability and concentration when high-current welding is performed, the weld pool temperature is moderate, the fluidity of the molten iron is moderate, the electric arc blowing force is stable and concentrated, and the welding operation performance is good.

The present invention provides a preparation method and application of a lithium iron titanate / carbon quantum dot composite material, belonging to the field of electrochemical energy storage technology. The preparation method comprises the following steps: uniformly mixing anatase and sodium hydroxide, ultrasonically treating, and hydrothermally activating the mixture; repeatedly centrifuging and adding deionized water to the activated product, sodium titanate, until the supernatant is neutral, and drying to obtain an acid-washed product; grinding, sieving, and calcining the acid-washed product to obtain bronze-phase TiO2(B); using citric acid as a chelating agent, dissolving CH3COOLi·2H2O, FeCl2·4H2O, TiO2(B), and carbon quantum dots in anhydrous ethanol, stirring in a water bath to obtain a gel, vacuum drying and sieving, and calcining under an inert atmosphere to obtain a pre-calcined material; and sequentially ball milling and sieving the pre-calcined material, followed by final calcination under an inert atmosphere to obtain a Li2FeTiO4 / carbon quantum dot composite material. The present invention combines carbon quantum dots with lithium iron titanate to form a lithium-ion battery positive electrode composite material with enhanced electrochemical performance. The preparation process is simple, low-cost, and suitable for large-scale commercial production.

The invention relates to a preparation method and application of chromium-doped sodium titanate with high cycle stability, the chromium-doped sodium titanate is formed by solid-phase sintering of Na2CO3, nano TiO2 and Cr2O3, and optimized Cr-Na2Ti3O7 has excellent cycle stability; the preparation method comprises the following steps: taking a certain amount of Na2CO3, nano TiO2 and Cr2O3 in a corresponding proportion, adding a small amount of isopropanol, and carrying out ball milling in a ball milling instrument for 5-8 hours; completely drying in a drying box, and putting the dried product into a tubular furnace; in a closed atmosphere of high-purity argon, carrying out solid-phase sintering for 10-12 hours by adopting a step-by-step calcination method, and naturally cooling to room temperature; when the material is used as a negative electrode of a sodium ion battery, the coordination environment of sodium ions can be changed, an interlayer Ti-O bond is optimized so as to optimize an interlayer structure, the irreversible capacity generated by Na2Ti3O7 in the charge-discharge cycle process is obviously reduced, and the cycle stability and the rate performance of the battery are improved; the preparation method has important significance for developing a high-performance negative electrode material of the sodium-ion battery and improving the performance of the sodium-ion battery.

The application discloses an aluminum alloy micro-arc oxidation plating solution and a preparation method and application thereof. The aluminum alloy micro-arc oxidation plating solution comprises water, potassium hydroxide and the following preparation raw materials: sodium hexametaphosphate 8-15 g / L; sodium silicate 10-18 g / L; sodium metavanadate 10-15 g / L; sodium molybdate 10-18 g / L; ethylene glycol 1-5 g / L; beta-glycerophosphoric acid sodium 2-5 g / L; sodium hexafluorotitanate 3-6 g / L; boric acid 1-3 g / L; and alkaline aluminum oxide sol, wherein the content of the aluminum oxide is 0.1-0.3 g / L; and the pH of the micro-arc oxidation plating solution is 9-12. The plating solution is suitable for surface treatment of aluminum alloy, can significantly improve the hardness, wear resistance and corrosion resistance of the material, and makes the surface more smooth and flat. The application further provides the preparation method and application of the aluminum alloy micro-arc oxidation plating solution.

This invention discloses a Na2Ti7O 15 Na₂Ti₃O₇ sodium titanate electrode material, its preparation method, and its application. This electrode material is a porous, blocky structure composed of stacked nanorods. It is synthesized by a simple solid-state method, where sodium carbonate precursor and anatase titanium dioxide are ball-milled in a specific ratio and then microwave-sintered in air. 15 The addition of [a specific ingredient] increases the exposure of the (100) sodium storage crystal face in Na2Ti3O7 sodium titanate, while decreasing the exposure of the (003) crystal face; Na2Ti7O 15 The presence of four TiO6 octahedrons within a single structural unit increases the number of sodium storage sites and widens the sodium ion diffusion channels, thereby improving the material's specific capacity and rate performance. (Na2Ti7O) 15 The two layers of TiO6 octahedrons are interconnected, making the structure more stable during sodium ion insertion / extraction, thereby increasing the long-term cycling stability of the material.

The invention relates to a gradient piezoelectric buffer layer, a preparation method and a solid-state battery. The gradient piezoelectric buffer layer comprises a sodium bismuth titanate nanoparticle coating layer, a lithium phosphate ion conduction layer and a PVDF-ZnO composite electrolyte layer which are arranged in a stacked mode. The preparation raw materials of the sodium bismuth titanate nanoparticle coating layer comprise a sodium source, a bismuth source, a titanium source, a mineralizer and a ternary positive electrode material. According to the invention, a three-layer structure of piezoelectric buffer layer-ion conduction layer-piezoelectric composite electrolyte is constructed, the volume change of the electrode is dynamically compensated by using the inverse piezoelectric effect of the piezoelectric material, and stress regulation and ion transmission are synchronously realized. Compared with a traditional passive buffering strategy, the method has the advantages that the interface impedance can be reduced, the cycling stability is remarkably improved, and technical support is provided for industrialization of high-energy-density (greater than or equal to 400Wh / kg) solid-state batteries.

The application relates to a sodium titanate nanofiber / reduced graphene oxide composite electrode material and a preparation method and application thereof. The composite electrode material has a two-dimensional sheet structure, the particle size is 1-6 mu m, the thickness is 10-20 nm, is composed of a few-layer reduced graphene oxide and sodium titanate nanofibers with a diameter of 5-10 nm loaded on the reduced graphene oxide, and is prepared by taking the few-layer reduced graphene oxide as a template, uniformly loading titanium dioxide particles, and then carrying out hydrothermal treatment in an alkali solution. Compared with the prior art, the synthesis method is simple in process, easy to scale up, and high in controllability. As a negative electrode of a sodium ion battery or a positive electrode of a sodium battery, the sodium titanate nanofiber / reduced graphene oxide composite electrode material has the advantages of high initial coulomb efficiency, low working voltage, high capacity, excellent rate characteristics and cycle stability, and has a broad market application prospect.

The application belongs to the field of sodium ion batteries, and discloses a modified preparation method of a sodium titanate manganese phosphate positive electrode material of a sodium ion battery, which comprises the following steps: S1, weighing a metal ion chelating agent to prepare a solution I; S2, weighing a manganese source, a titanium source and a sodium source, and dissolving them in the solution I to obtain a solution II; S3, dissolving a Li, Mg or Ca source material in the solution II to obtain a solution III; weighing a phosphate to prepare a solution IV; S4, dropping the solution IV into the solution III drop by drop; and S5, stirring under an oil bath condition, and then drying and calcining, so that the modified sodium titanate manganese phosphate positive electrode material is obtained. According to the application, the low-orbital energy level elements Li, Mg or Ca are introduced into the sodium titanate manganese phosphate Na3MnTi(PO4)3 positive electrode material, and the preparation method is controlled, so that the modified sodium titanate manganese phosphate positive electrode material is obtained, the electronic configuration of Li(Mg, Ca)-O-Mn is constructed, the inhibition of the anti-site defect is realized, and the improvement of the electrochemical performance is facilitated.

This invention belongs to the field of metallurgical solid waste resource utilization technology, specifically disclosing an iron-based additive, its preparation method, and its application. The preparation method includes: mixing red mud, sodium salt, and a reducing agent; subjecting the mixture to reduction roasting to obtain reduced clinker; grinding and separating the reduced clinker by magnetic separation to obtain iron concentrate, thus obtaining the iron-based additive. This invention uses red mud, sodium salt, and a reducing agent stored in alumina plants as raw materials. The sodium salt significantly lowers the reduction temperature of iron ore, and by controlling the temperature and the amount of reducing agent added, the hematite is partially or completely reduced. The resulting iron-based additive is returned to the Bayer process leaching, which can significantly improve the alumina leaching rate. Simultaneously, the titanium minerals in the obtained titanium-containing tailings exist in a specific phase or in the form of amorphous sodium titanate, exhibiting higher reactivity. This invention realizes the recycling and value-added utilization of solid wastes such as red mud, and has good application prospects.

The present application relates to the technical field of welding material, and discloses a kind of ultra-low carbon bainite high-strength steel matched flux-cored wire for high-speed train bogie and welding method.The flux-cored wire of the present application includes outer skin and flux filled in the outer skin, and the flux includes the following components by mass fraction: sodium fluoride 23-28%, CaCO3 8-15%, sodium titanate 12-15%, natural rutile 5-10%, potassium feldspar 4-7%, electrolytic manganese 6-10%, ferrosilicon 4-6%, nickel powder 6-9%, copper powder 0.5-0.8%, molybdenum iron 2.5-4%, niobium iron 0.2-0.3%, titanium iron 1.2-1.8%, and iron powder 8.6-13.1%.The flux-cored wire of the present application is used for welding of the steel in the manufacture of high-speed train bogie frame, and the weld metal has excellent strength, toughness and corrosion resistance, the weld is fine and has low risk of fatigue cracking, and meets the high standard requirements in the manufacture and service of high-speed train bogie.

According to the preparation method of the efficient and stable photo-thermal catalytic methane dry reforming catalyst provided by the invention, CO2 and CH4 can be efficiently and stably converted into synthesis gas (CO + H2) under relatively mild photo-thermal conditions by constructing a bifunctional NiRu bimetal active site. Specifically, perovskite is used as a precursor, a sodium titanate nanotube precursor is prepared through an alkaline hydrothermal method, and then the TiO2 nanotube carrier (TNT) is synthesized through acidification and calcination. Then, nickel chloride is used as a nickel source, and Ni particles are loaded to the surface of TNT through a wet impregnation method; on the basis, ammonium hexachlororuthenate is used as a ruthenium source, Ru < 4 + > is spontaneously reduced by Ni particles through an electric position exchange method, and a Ru site is loaded near a Ni site, so that the construction of a bimetallic site is realized. In the photo-thermal catalytic methane dry reforming reaction, Ni and Ru sites are respectively responsible for activating CH4 and CO2. According to the design, the advantages of low cost and high activity of Ni and high stability of Ru are taken into consideration, a remarkable synergistic effect is generated, the catalytic activity of the catalyst exceeds the simple addition of the activity of a corresponding single-metal catalyst, so that efficient activation of non-polar reactants is realized, and finally efficient and stable catalytic performance is achieved.

The invention relates to a doped sodium trititanate composite material as well as a preparation method and application thereof, and belongs to the technical field of sodium ion batteries. The doped sodium trititanate composite material comprises: a matrix composed of sodium titanate, aluminum doped in the surface region of the sodium titanate and magnesium doped in the bulk phase region of the sodium titanate; the chemical formula of the matrix is Na < 2-2x > Mg < x > Ti < 3-0.75 y > Al < y > O < 7 >, x is more than or equal to 0.01 and less than or equal to 0.05, and y is more than or equal to 0.002 and less The carbon conductive layer is formed by amorphous carbon and coats the surface of the substrate; and the electrolyte layer is composed of Na3PS4 and coats the surface of the carbon conductive layer. From the perspective of material thermodynamics, phase change is effectively inhibited by Al / Mg doping; in the aspect of interface chemistry, Na3PS4 is adopted to stabilize a solid electrolyte interface; and meanwhile, the preparation process is optimized from the aspect of process compatibility, so that the preparation of the doped sodium trititanate composite material with excellent performance is realized.

The invention discloses a preparation method of a sodium titanium phosphate negative electrode material. The method comprises the following steps that S1, sodium ions are embedded into titanium dioxide through an electrochemical method, a sodium titanate compound is obtained, the chemical general formula of the sodium titanate compound is NaxTiO2, and x is larger than or equal to 0.5 and smaller than or equal to 0.8; s2, the sodium titanate compound in the step S1 is mixed with phosphate, a precursor mixture is obtained, and the molar ratio of Ti to P in the sodium titanate compound and the phosphate is 2: 3; and S3, sintering the precursor mixture obtained in the step S2 under the protection of inert gas to obtain the sodium titanium phosphate negative electrode material with the NASICON type structure. Through an electrochemical sodium pre-embedding process, uniform mixing of reactants at an atomic level is realized, the temperature and energy consumption of a subsequent solid-phase reaction are remarkably reduced, and the reaction time is shortened. Meanwhile, the preparation method is simple and low in cost, and the prepared product is high in purity and has a good application prospect.

According to the atmosphere plasma spraying ceramic coating and the preparation method and application thereof, in the atmosphere, plasma flame flow is adopted for preheating the surface of a metal alloy matrix, and then the preheated surface is formed; sodium hexatitanate is used as a raw material, and the raw material is prepared into target powder in a crushing sintering or granulation sintering mode; and the target powder is heated and molten in plasma spraying flame flow to form molten particle flow, the molten particle flow is sprayed to the preheated surface, and the ceramic coating is obtained. Experimental results show that the ceramic coating obtained by the embodiment of the invention is high in density, low in porosity and excellent in corrosion resistance, can be used as a corrosion-resistant coating of a metal part in mechanical equipment, remarkably prolongs the service life of the metal part, and has a wide application prospect.

The embodiment of the present application relates to a calcium ion doped modified sodium lithium titanate material and a preparation method thereof, a negative plate and a battery, and belongs to the technical field of lithium ion battery negative materials.The embodiment of the present application aims to solve the technical problems of poor conductivity, low reversible capacity and poor cycle stability of sodium lithium titanate as a negative material in the prior art.The calcium ion doped modified sodium lithium titanate material of the embodiment of the present application has a chemical molecular formula of: Na2Ca x Li 2‑x Ti6O 14 , wherein the value range of x is 0 <= x <= 0.30.The material provided in the embodiment of the present application shows a higher discharge specific capacity, a lower internal resistance and a better cycle life in electrochemical tests, which indicates that the material has potential in the application of lithium ion batteries and can meet the performance and cycle life requirements.

The present invention is based on Na2Ti7O 15 This paper describes a doped sodium titanate electrode material, its preparation and use. The electrode material has a porous block structure stacked with nanorods and is synthesized by a simple solid-state method using proportional ball milling of precursors sodium carbonate and anatase titanium dioxide followed by microwave sintering in air. The resulting Na2Ti7O 15 The addition of Na increases the exposure of the (100) sodium storage crystal plane of Na2Ti3O7 sodium titanate and decreases the exposure of the (003) crystal plane, resulting in Na2Ti7O 15 has four TiO6 octahedra in one structural unit, providing more sodium storage sites and wider sodium ion diffusion channels, improving the specific capacity and rate performance of the material. 15 The TiO6 octahedra in the upper and lower layers are connected to each other, making the structure more stable during the sodium ion insertion / extraction process, thereby improving the long-term cycling stability of the material.

The invention relates to a sodium-ion battery negative electrode material and a preparation method and application thereof, and belongs to the technical field of sodium-ion batteries. The sodium ion battery negative electrode material comprises sodium titanate and a composite coating layer coating the surface of the sodium titanate, and the composite coating layer comprises titanium carbide and carbon; the mass ratio of the sodium titanate to the titanium carbide to the carbon is (70-90): (5-15): (2-10). By compounding the sodium titanate and the composite coating layer (titanium carbide and carbon), the conductivity is remarkably improved, the 10C capacity retention ratio is increased to 70% from 30%, and the coulombic efficiency is increased to 95% from 65%.

The application provides a preparation method of a metal-doped sodium titanate negative material, which comprises the following steps: S1, hydrolysis solution preparation: dissolving titanyl sulfate and metal A sulfate in water as a hydrolysis solution, wherein the molar ratio of A:Ti is 0.01-0.5:1; S2, bottom liquid preheating: taking a proper amount of deionized water in a reaction kettle and preheating to 80-110 DEG C; S3, hydrolysis: under the state of stirring, the hydrolysis solution is uniformly added into the reaction kettle, and the system temperature in the reaction kettle is kept constant; S4, preparation of metatitanic acid: after the hydrolysis, the slurry is cooled to room temperature, washed with water and dried to obtain metal-doped metatitanic acid; S5, preparation of sodium titanate: the sodium source and the metal-doped metatitanic acid are uniformly mixed according to the molar ratio of sodium and titanium 2:3, calcined under the argon atmosphere, and then naturally cooled to obtain the metal-doped sodium titanate. The metal-doped sodium titanate prepared by the application has low cost, simple process and excellent product performance.

The invention discloses a titanium sodium phosphate coated doped sodium titanate composite material and a preparation method and application thereof, the preparation method comprises the following steps: mixing a titanium source, a sodium source, a doping source and a solvent, ball-milling and calcining to obtain doped sodium titanate Na < 2 > Ti < 3-x > M < x > O7, M is selected from Zr and / or Sn, and x is 0.02-0.08; the preparation method comprises the following steps: mixing doped sodium titanate with a phosphorus source and a solvent, carrying out ball milling, carrying out pretreatment at 300-450 DEG C, carrying out heat treatment at 600-800 DEG C, and constructing a sodium titanium phosphate coating layer on the surface of the doped sodium titanate in situ to obtain the sodium titanium phosphate coated doped sodium titanate composite material. Zr / Sn is introduced into sodium titanate crystal lattices for bulk phase doping, and the crystal framework is stabilized; and a sodium titanium phosphate protective layer which is electrochemically inert and ion-conductive is constructed on the surface of the particle in situ, and direct contact between an active interface and an electrolyte is blocked, so that synchronous optimization of structural stability and interface safety is realized.

This invention relates to the field of piezoelectric ceramics technology, specifically to a high-electrostrain bismuth sodium titanate-based lead-free piezoelectric ceramic material and its preparation method. The general chemical formula of the ceramic material is: (Bi 0.5 Na 0.5 ) (1‑x) (Ca 0.5 Sr 0.5 ) x Ti 0.98 (Sn 0.5 Sb 0.4 ) 0.02 O3, in which x =0.03~0.4. Its preparation method includes: weighing raw materials according to stoichiometric ratio, ball milling and mixing, pre-calcination synthesis, secondary ball milling, granulation and molding, and debinding sintering. This invention introduces Ca at the A-site. 2+ and Sr 2+ Constructing quasi-isomorphic phase boundaries to lower the polarization energy barrier; introducing Sn through the B site. 4+ and Sb 3+ The formation of defect dipoles pins domain walls and enhances the random field. These two factors work synergistically to significantly improve the electrostrain properties of the material; the prepared ceramic exhibits a maximum strain of [value missing] under an electric field of 100 kV / cm. S max The inverse piezoelectric coefficient is 2.18%, the inverse piezoelectric coefficient is 2572 pm / V, and the memory strain is 2.18%. S r With a lead content of 1.19%, and a simple, environmentally friendly process, it is suitable for mass production and has broad application prospects in the field of high-performance lead-free actuators.

The invention relates to a bimetal MOFs modified titanium implant capable of achieving dual-waveband optical response and a preparation method and application thereof. The method comprises the following steps: (1) pretreating titanium-based metal; (2) immersing the pretreated titanium-based metal substrate into a sodium hydroxide solution to obtain titanium-based metal with a sodium titanate pre-coating; and (3) the titanium-based metal with the sodium titanate pre-coating reacts with a mixed solution composed of a tetrabutyl titanate solution, a copper nitrate hexahydrate solution and a 2-aminoterephthalic acid solution, and the bi-metal MOFs modified titanium implant capable of achieving dual-waveband optical response is obtained. According to the bimetal MOFs modified titanium implant capable of achieving dual-waveband optical response, OH, O2, 1O2, H2O2 and other various active oxygen can be produced according to dual-waveband illumination as required, rapid sterilization in an operation and precise antibacterial after the operation are achieved, the occurrence rate of infectious bone defect feeling is remarkably reduced, and a programmable photocatalytic antibacterial barrier is provided for orthopedic implants.

The invention relates to the field of sodium titanate batteries, in particular to a sodium titanate battery which is provided with a positive electrode, and the positive electrode is prepared from the following materials in any one of the following modes: the first mode comprises 35.6 parts by weight of TiO2, 38.2 parts by weight of NaCl and 26.2 parts by weight of ZnO; or the second one comprises the following components in parts by weight: 25.6 parts of TiO2, 38.2 parts of NaCl, 10 parts of Fe2O3 and 26.2 parts of ZnO; or the third one comprises the following components in parts by weight: 44.3 parts of TiO2, 38.2 parts of NaCl and 17.5 parts of Fe2O3; or the fourth one is prepared from the following components in parts by weight: 34.3 parts of TiO2, 38.2 parts of NaCl and 27.5 parts of Fe2O3; graphite is used as a negative electrode; and polyaluminum chloride and water are used as electrolyte. The preparation method has the beneficial effects that the sodium titanate / sodium iron titanate is used as the positive electrode material, the high voltage is good, the discharge performance is excellent, and the cost of the battery prepared according to the method is lower.

The invention relates to a carbon-coated sodium titanium phosphate nano material and a preparation method thereof, and belongs to the technical field of sodium ion batteries. The preparation method comprises the following steps: S1, uniformly mixing a sodium source, a titanium phosphorus source and a supplement, and calcining to obtain single crystal type titanium sodium phosphate; the titanium phosphorus source is selected from titanium phosphate and / or titanium pyrophosphate; s2, performing wet ball milling, spray drying and sintering on the single crystal type sodium titanium phosphate and a carbon source to obtain a carbon-coated sodium titanium phosphate nano material; according to the process, the structural stability and the electrochemical performance of the product are remarkably improved.

The invention belongs to the technical field of high-temperature-resistant bricks. The invention provides a preparation process of a high-air-temperature-resistant pipeline brick, which comprises the following steps: S1, putting 64-67 parts by weight of sintered mullite, 8-10 parts by weight of white corundum, 6-8 parts by weight of andalusite, 1-2 parts by weight of silicon dioxide micro powder, 5-6 parts by weight of aluminum oxide micro powder, 3-4 parts by weight of cobalt-doped sodium titanate and 2.5-3.5 parts by weight of plasma activated yttrium oxide into a mixer for dry mixing, 4-5 parts of water is added for wet mixing, and a mixture is obtained; s2, the mixture obtained in S1 is put into a mold to be pressed, then the mixture is taken out and naturally dried for 36-48 h, then the mixture is put into a dryer to be dried, and a green brick is obtained; and S3, putting the green brick obtained in the S2 into a kiln, calcining, and cooling to obtain the high-air-temperature-resistant pipeline brick. The apparent porosity of the prepared pipeline brick is effectively reduced, the alkali corrosion resistance of the pipeline brick is improved, and the service life is prolonged.

The invention relates to a sodium trititanate / hard carbon composite material as well as a preparation method and application thereof, and belongs to the technical field of sodium ion batteries. The sodium trititanate / hard carbon composite material disclosed by the invention comprises sodium trititanate nanosheets, hard carbon microspheres and a carbon conductive layer for jointly coating the sodium trititanate nanosheets and the hard carbon microspheres; the sodium trititanate nanosheets and the hard carbon microspheres form a C-N-Ti covalent bond interface through carbonization enhancement under the action of the enhancer; the thickness of the sodium trititanate nanosheet is less than 10nm, and the oxygen defect concentration is 5%-10%; the specific surface area of the hard carbon microspheres is 10m < 2 > / g-50m < 2 > / g, the specific discharge capacity is greater than 300mAh / g, the ID / IG is 0.8-3, and the particle size D50 is 200nm-500nm. The first coulombic efficiency (ICE) of the composite material can reach more than 80%, and the capacity retention ratio of 10000 cycles is greater than 90%.