1551results about How to "Synthesis temperature is low" patented technology

The invention relates to an infrared-excited oxide up-conversion luminescence piezoelectric material of a bismuth lamellar perovskite-like structure and a preparation method thereof. The up-conversion luminescence piezoelectric material has a chemical general formula of Am-1-x-RxYbyBi2BmO3M<+3>, wherein R is selected from Er<3+>, Ho<3+> and Tm<3+>, A is selected from Bi<3>, Ca<2+>, Sr<2+>, Ba<2+>, Pb<2+>, Na<+>, K<+>, La<3+> and Y<3+>, B is selected from Ti<4+>, Zr<4+>, Nb<5+>, Ta<5+>, W<6+> and Mo<6+>, m is a positive integer not smaller than 2 and not more than 8, x is not smaller than 0.000001 and not more than 0.3, and y is not smaller than 3.0 and not more than 0.6. The up-conversion luminescence piezoelectric material is prepared by adopting a solid-phase reaction method, has the characteristics of good thermal stability, good chemical stability, easiness for synthesis, high luminous intensity and adjustable color, and can be widely applied to various aspects such as three-dimensional display, infrared detection, counterfeiting prevention, solar cells and photoelectric integration, micro-electro-mechanical systems, photoelectric sensing and the like.

A synthetic method of a novel visible light photocatalyst Bi2MoO6 (bismuth molybdate) is provided. The method includes the following steps: weighing Bi(NO3)3*5H2O and (NH4)6Mo7O24*4H2O solids at the theoretical ratio by mass of 14:1, dispersing the weighed solids into an appropriate amount of deionized water, stirring to obtain white curdy precipitates, placing the precipitates in a magnetic stirrer and stirring at normal temperature for 30 minutes, subjecting to ultrasonic treatment with a ultrasonic generator for 30 minutes to allow intensively mixing, allowing reactions of the treated white precipitates at 150-200 DEG C under sealed conditions, filtering the reaction product to collect flavescent precipitates, washing, drying, and grinding to obtain Bi2MoO6 (bismuth molybdate) photocatalyst. The photocatalyst has good photodegradation effect on target pollutants; and when the temperature of hydrothermal synthesis is 160 DEG C, the removal rate of target pollutant 4BS after photodegradation for 90 minutes reaches 99.5%. The inventive synthetic method has the advantages of simple process and low requirement for equipment, and is suitable for the synthesis of highly-active visible light photocatalyst Bi2MoO6 (bismuth molybdate).

A preparation method of a carbon coated vanadium sodium phosphate positive electrode material comprises the steps: with glucose as a reducing agent and a carbon source and water as a dispersant, carrying out ball milling of NH4VO3, NaH2PO4.2H2O and glucose in water, carrying out spray drying, calcining, and thus obtaining the carbon coated vanadium sodium phosphate positive electrode material. The method has the advantages of low synthesis temperature, simple steps, easily obtained raw materials, and advantageous industrialization; the obtained carbon coated vanadium sodium phosphate positive electrode material has a structure with uniform primary particles, has the particle size of 100-200 nm, and has the characteristics of short sodium ion diffusion distance, fast transmission speed, high specific surface area, high electrical conductivity and fast ion transmission and the like. The obtained carbon coated vanadium sodium phosphate positive electrode material is assembled into a battery; in a voltage scope of 2.0-3.75 V and under 1 C multiplying power, the highest first charge and discharge capacity per gram can reach 93.5 mAh*g<-1>, the capacity retention rate can be up to 97.7% after cycling for 50 circles with the 1C multiplying power, and excellent electrochemical performance is showed.

The invention discloses a preparation method of a Ti3AlC2 ceramic powder, and belongs to the technical field of material science. The preparation method includes the following steps: taking Ti, Al and TiC respectively according to a molar ratio of Ti:Al:TiC:Sn:Si equal to 1:(1-1.3): 2:(0.05-0.2):(0.05-0.15), then adding a Sn powder and a Si powder and mixing well to obtain a mixture; 2) adding ethanol, conducting fully ball milling to obtain a uniform powder and drying; and 3) sintering the dried mixture in vacuum and cooling to obtain the Ti3AlC2 ceramic powder. The simple process provided by the invention is simple; addition of a grinding aids improves mixing uniformity of the mixture; addition of synthetic additives improves the purity of the product and reduces the impurities; and using TiC powder as a C source not only reduces the synthesis temperature but also improves the purity of the product.

The invention discloses lithium molybdate serving as a secondary battery electrode material. In an execution mode, a chemical formula of the electrode material is Li (2-x)MoyMzO(3-u), wherein x is larger than or equal to minus 2 and smaller than or equal to 2, y is larger than 0 and smaller than or equal to 5, z is larger than or equal to 0 and smaller than or equal to 9, u is larger than or equal to minus 9 and smaller than or equal to 3, and M comprises one element selected from C, N, F, Na, Mg, Al, Si, P, S, Cl, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Br, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Cd, In, Sn, Sb, Te, I, Cs, Ba, Ta, W, Re, Os, Ir, Pt, Au, Hg, Pb, Bi, Po, At, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu or combination of the elements. The electrode material is characterized by having very high specific capacity, excellent cycle performance, rate capability and safety.

The invention relates to a lithium titanate/titanium black anode material and a preparation method thereof belonging to the technical field of lithium ion batteries. The lithium titanate/titanium black anode material has a chemical formula of (1-0.8x)Li4Ti5O12-xTi4O7, wherein x is more than 0,03 and is not more than 0.30. The lithium titanate/titanium black anode material can be synthesized by adopting two methods, the first method is as follows: lithium titanate is carbonized in vacuum, a compact titanium black high-conductive membrane is formed on the surface of the lithium titanate through controlling temperature, reaction time and pressure to have higher multiplying power performance; and the second method is as follows: Ti4O7 is directly added in the lithium titanate, and the lithium titanate/titanium black anode material is synthesized under an inert atmosphere at high temperature. The lithium titanate/titanium black anode material has a simple manufacture process and is beneficial to industrialized production. Compared with the current marketized anode material, the lithium titanate/titanium black anode material has higher electrical conductivity and corrosion resistance and higher large-current discharge cycling performance; and multiplying power charge and discharge performances and cycling performance of a lithium ion power battery can be further improved.

The invention discloses a making method of Li-La-Ti oxide in the lithium ion battery domain, which comprises the following steps: adopting lithium nitrate, lanthanum nitrate and butyl titanate as raw material with molecular formula as Li3xLa2/3-xTiO3 (0<x<0.16); setting the molar rate of Li, La and Ti at 1: 1: 2; adopting alcohol or ethylene glycol monomethyl ether as solvent; or adjusting pH value under 1 through water and acetate; drying solution; sintering under 800-900 deg.c for 2h; obtaining pure LLTO. the invention shortens experimental period and synthesizing temperature with grain size about 200nm, which possesses excellent compact and electric property.

The utility model discloses a spherical hydroxyl nickel oxide cobalt manganese and the fabrication method, relating to the anode material of a lithium battery, and aiming to provide a spherical hydroxyl nickel oxide cobalt manganese and the fabrication method. The fabricated anode material of the lithium battery has the advantages of big tap density, good electrochemical activity, big specific volumetric capacity, low synthesis temperature and short reaction time. The key points of the technical proposal of the utility model are that: the general formula of the spherical hydroxyl nickel oxide cobalt manganese is Ni1-x-yCoxMnyOOH; the spherical hydroxyl nickel oxide cobalt manganese and the fabrication method comprise the following steps: (1)a mixed salt solution of nickel, cobalt and manganese is confected according to the ratio that Ni:Co:Mn=1:(1/5-2/5):(1/5-2/5); (2) an alkaline solution of two to ten mol/L is confected; (3) the mixed salt solution of nickel, cobalt and manganese, the alkaline solution and the ammonia are conducted to an reaction kettle; (4) the intermediate products are added to the reaction kettle according to the solid-liquid ratio of 1:2 to 10, and reacted with the oxidant to produce the utility model. The utility model is used as the anode material of lithium batteries.

The invention relates to a metallic carbide/carbon composite coating prepared on the surface of a carbon material and a method thereof. The method comprises the following steps: placing the carbon material into a chemical vapor deposition furnace, introducing propylene and nitrogen of which flow rates are 100 to 800sccm and 100 to 2,000sccm respectively into the furnace, simultaneously heating the carbon material to between 700 and 1,300 DEG C at a rate of 1 to 20 DEG C per minute, and preserving the heat for 40 to 120 hours to obtain the carbon material of which surface is deposited with a pyrolytic carbon coating; placing the carbon material into a crucible, covering a mixture of 1 to 1.9 times of assistant and 0.01 to 1.2 times of transition metal powder in terms of the carbon material on the carbon material, heating the carbon material to between 600 and 1,200 DEG C at a rate of 1 to 30 DEG C per minute under the atmosphere of the nitrogen, preserving the heat for 1 to 20 hours, cooling the mixture and then taking out a product, washing the product by water and drying the product to obtain the composite coating. The method can prepare various transition metallic carbide/carbon composite coatings on the surface of the carbon material, the thickness and form of the coating are controllable, the combination of the coating and the carbon material basal body is good, and the properties of high-temperature oxidation resistance and ablation resistance of a base material are improved.

The invention provides a sol-solvent thermal method for synthesizing a nanocrystalline oxide powder. The method comprises the following: (1) a step of preparation of inorganic salt mother liquids, during which the inorganic salt taken as a material is dissolved in an organic liquid medium or water to prepare a mother liquid of the inorganic salt with definite concentration; (2) a step of preparation of a precipitation reactant liquid, during which alkali is dissolved in an organic liquid medium or water, proper quantity of surfactants are added to prepare the precipitation reactant liquid with definite concentration; (3) a step of preparation of sols, during which, at a certain temperature, while stirring, the prepared reactant liquid is slowly added in the prepared mother liquid of the inorganic salt, the reactant liquid and the mother liquid of the inorganic salt are kept reacting for a period of time after adding the reactant liquids in the mother liquid of the inorganic salt, and the transparent sols are obtained; and (4) a step of solvent thermal reaction of the sols, during which the prepared sols are put in a reaction kettle and reacted for a period of time under a certain temperature and pressure, the products obtained are subjected to filtering, washing and drying, and the nanocrystalline oxide powder is obtained.

A process for preparing the carbide of transition metal includes such steps as putting carbon in crucible, covering it by assistant and transition metal, heating to 600-1300 deg.C at 0.1-30 deg.C/min under protection of Ar gas or in vacuum, holding the temp for 0.1-200 hr, cooling, boiling the crucible in water, taking the carbide, water washing and drying.

The invention belongs to the technical field of electrode materials and relates to sodium vanadium fluorophosphate as well as a low-temperature environment-friendly preparation method and use thereof. The preparation method comprises the steps of preparing a mixed water solution of a sodium source, a vanadium source, a phosphorus source and a fluorine source, reacting by virtue of the mixed water solution at 20-180 DEG C to obtain sodium vanadium fluorophosphate, wherein the vanadium source is a trivalent vanadium source and/or a tetravalent vanadium source; the chemical constitution of sodium vanadium fluorophosphate is Na3(VOxPO4)2F3-2x, and x is more than or equal to 0 and less than or equal to 1. According to the low-temperature environment-friendly preparation method, the mixed water solution of the sodium source, thephosphorus source, the fluorine source and the trivalent vanadium source and/or a tetravalent vanadium source can generate spontaneous reaction at 20-35 DEG C, the reaction can be accelerated at a temperature high than 35 DEG C and lower than 180 DEG C, and well-crystallized sodium vanadium fluorophosphate can be obtained. Sodium vanadium fluorophosphate can be used as an anode to be assembled into a battery, the specific discharge capacity is not lower than 100mAh/g, and the cycling stability is good.

The invention discloses a hexagonal boron nitride two-dimensional ultrathin nanometer sheet as well as a preparation method and application thereof and belongs to the technical field of nanometer materials. According to the invention, metal boride (such as calcium boride, lanthanum boride, magnesium boride, titanium boride and the like) is adopted as a boron resource; ammonium salt (such as ammonium chloride, ammonium bromide, ammonium nitrate and the like) is adopted as a nitrogen source; and the hexagonal boron nitride two-dimensional ultrathin nanometer sheet with the thickness of 0.5-4.0nm is obtained through the reaction under a mild condition (at the temperature of 500-600 DEG C). The invention aims to realize the macro-quantity preparation of the hexagonal boron nitride two-dimensional ultrathin nanometer sheet at the mild temperature by adopting cheaper raw materials; the preparation method has the advantages of saving the energy, simplifying the experimental step and greatly reducing the product cost; and due to the high heat conductivity, heat stability and chemical stability, the hexagonal boron nitride two-dimensional ultrathin nanometer sheet can be applied to the fields of heat dissipation materials, polymer filling materials, catalyst carriers and the like.

The invention discloses a visible-light-induced photocatalyst Bi4O5Br2 and a preparation method thereof. According to the visible-light-induced photocatalyst Bi4O5Br2 and the preparation method thereof, an improved low-temperature hydrothermal method is adopted, composition of Bi, O and Br in BiOX is controlled by controlling amount of a bismuth source and a bromine source, and a novel layered-cake-shaped visible-light-induced photocatalyst Bi4O5Br2 is prepared successfully. The preparation method is simple in production process, easy to operate, low in synthesis temperature, high in reaction yield, environment-friendly and low in cost and meets the requirement of actual production, the reaction yield is 92%, and raw materials are easy to obtain. The visible-light-induced photocatalyst has good visible-light catalytic activity, can completely degrade various organic pollutants such as rhodamine b, methyl orange and methylene blue in short time under the visible light irradiation, is small in light corrosion and good in reusability, can be applied to industrial production and particularly has a better application value in organic pollutant degradation through solar photocatalysis, and the market potential is large.

The invention discloses a method for preparing titanium dioxide hollow spherical powder, belonging to the technical field of material powder preparation. The method comprises the following steps: firstly, TiCl4 is added into ion liquid with a proper amount; the mixture is stirred uniformly with ultrasonic; deionized water is slowly added, wherein water is in the upper layer; after a period of time, water gradually enters an ion liquid layer to hydrolyze the TiCl4 to obtain a deposit ; because the obtained solution has lamination phenomenon, liquid at the upper layer is separated according to colors, and the ion liquid can be repeatedly utilized; and the deposit is washed by the deionized water and ethanol, separated by centrifugation, dried and baked to obtain the titanium dioxide hollow spherical powder with favorable dispersivity. The method has the advantages of simple and easily controlled process parameters, uniform and adjustable granularity, resource saving, little pollution, and the like.

The present invention provides a sodium vanadium fluorophosphate, a preparation method and uses thereof, wherein the molecular formula of the sodium vanadium fluorophosphate is Na3(VOxPO4)2F3-2x, x is more than or equal to 0 and is less than or equal to 1, the morphology is a spherical wool ball, loose hollow ball or nanoparticle aggregate, and the size is from nanometer to micron. The preparation method comprises: (1) dissolving a vanadium source in water to obtain a vanadium source solution; (2) adding a phosphorus source, a fluorine source and a sodium source to the vanadium source solution to obtain a reaction mixture; and (3) post-treating the obtained reaction mixture to obtain the sodium vanadium fluorophosphate. According to the present invention, the water is directly used as the solvent so as to provide the advantage of no pollution; the sodium vanadium fluorophosphates can be directly synthesized at the room temperature of 10-35 DEG C, such that the temperature is low, the reaction kinetics is rapid, and the large-scale preparation of the sodium vanadium fluorophosphates can be achieved; the morphology and the crystallinity of the sodium vanadium fluorophosphate can be adjusted; the pentavalent vanadium industrial product can be used as the vanadium source so as to substantially reduce the cost of the vanadium source; and the prepared material has good electrochemical properties, and is suitable for the sodium ion battery positive electrode material.

The invention discloses a synthetic method of Ni3S2 microrod array. The synthetic method comprises following steps: 1, nickel foam to be treated is subjected to full ultrasonic cleaning and drying; 2, a vanadium source and a sulfur are dissolved in an appropriate amount of a solvent at a molar ratio of 1: (1-11), and full stirring is carried out so as to obtain a solution A, wherein the concentration of the vanadium source in the solution A is controlled to be 10 to 40mM; 3, the solution A is delivered into a hydrothermal reactor with a polytetrafluoroethylene lining, the nickel foam obtained via pretreatment in step 1 is immersed in the solution A, the hydrothermal reactor is sealed, and solvothermal reaction is carried out at 70 to 200 DEG C for 6 to 30h; and 4, after reaction, the hydrothermal reactor is cooled at room temperature, and an obtained product is washed fully and dried so as to obtain the Ni3S2 microrod array. Operation of the synthetic method is simple; reaction conditions are mild; reaction period is short; the purity of prepared Ni3S2 is high; the morphology is uniform; and excellent electrocatalytic hydrogen evolution performance is achieved.