348results about How to "Preparation conditions are easy to control" patented technology

The invention relates to a carbon coated lithium iron phosphate microwave-synthesizing method, relating to the preparation of anode material of a Li-ion battery. The invention weighs lithium carbonate, iron oxalate and ammonium diacid phosphate, proper amount of heat conduction agent and organic matter in chemical gauging ratio, using anhydrous alcohol as dispersant to fully grind and mix them, drying and pressing the mixture into blocks, placing the blocks in a pot holding activated carbon, and placing the pot in microwave field for irradiative heating so as to be able to make uniform- phase carbon coated lithium iron phosphate. The invention can realize carbon coating of lithium iron phosphate and more rapidly and uniformly heat the raw materials, beneficial to uniform and rapid reaction of massive raw materials. The method can shorten production cycle and reduce energy consumption.

The invention discloses a probe reagent for concurrent selection and determination of multiple metal ions, and preparation and appliance, and belongs to the field of organic synthesis and analytical chemistry. Tri (2-aminoethyl) amine serves as a parent, wherein rhodamine B is connected to an amino chain, 2-hydroxy-1-naphthaldehyde groups are connected to other two amino chains respectively, and thus a tripod structured rhodamine-hydroxyl naphthalene derivative probe is prepared. In 1,4-dioxane / water (19 / 1, v / v, pH=7) solution, the probe respectively detects Cu2+, Co2+ and Fe3+ by utilizing rate absorption of different wavelengths, and the detection does not interfere with each other; in acetonitrile / water (19 / 1, v / v) solution, fluorescence emission of different wavelengths under different pHs is utilized, the probe respectively detects Zn2+, Al3+, Hg2+ and Cu2+, and the detection does not interfere with each other; under an ultraviolet lamp of 365 nm, Zn2+, Al3+ and Hg2+ are detected to show blue, pink and orange red fluorescence respectively, and through -Zn2+ mixture detection by the probe, Cu2+ shows blue fluorescence vanishing. The probe structure is as follows.

The invention relates to a preparation method of a two-dimensional titanium carbide (Ti3AlC2) adsorbing material and belongs to the field of material preparation. Ternary lamellar compound Ti3AlC2 ceramic powder is soaked with a hydrofluoric acid solution to react for a period of time, and therefore a two-dimensional titanium carbide material is prepared; then the material is soaked with an alkaline solution, the materials are heated and stirred, the materials are cleaned, centrifuged and dried, and the alkalized two-dimensional titanium carbide adsorbing material is prepared. The preparation method is easy and convenient to use, and the target material can be rapidly prepared. The prepared two-dimensional titanium carbide adsorbing material is mainly used for removing dye molecules, heavy metal ions and other pollutants in sewage.

The invention discloses a method for preparing a solid electrolyte by using lithium lanthanum zirconium oxide precursor coated powder. The method specifically comprises the steps of dissolving a certain amount of lanthanum nitrate and zirconium nitrate into water, adding a precipitator, namely ammonium carbonate, controlling the pH value to ensure that La<3+> and Zr<4+> ions are simultaneously precipitated, and filtering and washing the precipitate; weighing a certain amount of lithium oxalate, dissolving lithium oxalate into water, adding the precipitate into the lithium oxalate solution, stirring, evaporating, crystallizing, and separating out lithium oxalate crystal on the surface of the precipitate to form precursor powder with a coated structure. The prepared powder has the advantages of uniform mixing, fine grains, high purity and the like; through the formed specific coated structure, the calcination temperature of the powder is low, the sintering time of the powder is short, and the room-temperature lithium ion electric conductivity of the sintered lithium lanthanum zirconium oxide is more than 2.2*10<-4>S / cm. According to the method, the process is simple, the cost is low, the preparation conditions are easy to control, and the prepared solid electrolyte is good in electrochemical stability and high in electric conductivity and can be used for preparing all-solid-state lithium ion batteries.

The present invention provides the combining method, structure and preparation process of electrochemical supermicro electrode. The electrochemical supermicro electrode is a two-electrode system with one supermicro electrode and one aligning / reference electrode combined together and separated with nanometer level thickness insulating layer. After diffusion layers on these two electrodes are coincided, the electrochemically reversible material particle may be oxidized or reduced on one electrode and reducing or oxidizing regenerated in the other electrode before being re-diffused to original electrode, so as to amplify current signal output by the cell detecting electrode. The present invention has obviously reduced solution resistance, high scanning speed and detection sensitivity, minimized damage to the researched system and other advantages.

The invention relates to a bionic regenerated silk fibroin filament fiber and a preparation method thereof. The filament fiber is composed of natural silk fibril. The preparation method comprises the following concrete steps: with degummed mulberry silk as a raw material, carrying out partial dissolving by using an acid solution containing a salt so as to obtain a spinning solution composed of natural silk fibril; and then carrying out wet or dry spinning so as to prepare the bionic regenerated silk fibroin filament fiber. According to the invention, the newly developed regenerated silk fibroin filament fiber has a multilevel fibrilation structure and excellent mechanical properties as natural silk does and is completely different from a traditional regenerated silk fibroin filament fiber; the preparation method has the advantages of easiness, high efficiency, stable process, short flow, easy operation, high productivity and easy realization of industrial mass production, so the method has important application prospects in cyclic regeneration and application of silk in the fields of textile fiber raw materials and biomedical materials.

The invention discloses a method for preparing a porous molybdenum carbide nanofiber by adopting electrostatic spinning, and belongs to the technical field of nano materials. The method comprises the following steps: with water-soluble molybdate as a molybdenum source, and a water-soluble high-molecular polymer as a carbon source, dissolving and evenly mixing the water-soluble molybdate and the water-soluble high-molecular polymer at room temperature; and preparing a molybdate nano fiber by adopting an electrostatic spinning method; burning in an inert atmosphere or a reducing atmosphere; and simultaneously achieving high-temperature thermal decomposition, reduction and carbonization, so as to obtain the porous molybdenum carbide nanofiber in one step. According to the method, cheap molybdate and water-soluble high-molecular polymer are taken as raw materials; the method is artfully combined with a relatively mature electrostatic spinning technology in industry; and the method is high in preparation efficiency and product quality, low in cost, simple and easy to control, friendly to environment, free of pollution, and suitable for industrial production, and has important application value and industrial prospect in a plurality of fields such as catalysts, electrode materials, super capacitors and sensors.

The invention discloses a method for preparing highly-dispersed regular octahedral platinum nano particles. The method comprises the following steps of: 1, preparing chloroplatinic acid stock solution, namely dissolving 0.5 to 2g of chloroplatinic acid (H2PtCl6) in pure water to prepare chloroplatinic acid solution with the concentration of 50 to 400mM; 2, mixing organic matter mixed inducing solution, namely treating polyethylene glycol with the molecular weight of 600 to 2,000 to prepare aqueous solution with the concentration of 0.5 to 2M, and marking the aqueous solution as solution 1; treating one or more of more than 20 kinds of amino acid which is required by a human body to prepare the aqueous solution with the concentration of 0.5 to 2M, and marking the aqueous solution as solution 2; mixing the solution 1 and the solution 2 in a ratio of 1 to 1 to prepare the organic matter mixed inducing solution and marking the solution as solution 3; and 3, performing hydrothermal inducing, namely adding 30 to 60ml of the solution 3 into 100ml of a hydro-thermal reaction kettle, simultaneously adding 1 to 5ml of chloroplatinic acid solution with the concentration of 50 to 400Mm; and stirring the solution for half an hour, performing hydrothermal treatment at the temperature of between 150 and 200 DEG C for 3 to 8 hours, wherein after the hydrothermal treatment, the particle ripening placement time is 4 to 8 hours.

The invention relates to a preparation method of a silver-doped two-dimensional graphite phase carbon nitride composite photocatalyst. The preparation method includes the steps of pretreatment of a thermolysis precursor and preparation of the silver-doped two-dimensional carbon nitride composite photocatalyst. The preparation method has the advantages that the preparation method is simple, the preparation condition is easy to control, the prepared silver-doped two-dimensional lamellar carbon nitride composite photocatalyst is an environment-friendly high-performance catalyst, contamination is avoided, catalysis efficiency is high, and certain application value is achieved.

The invention relates to a preparation method for a metal organic framework material UIO-66 (NH2) doped rodlike cadmium sulfide (CdS NRs) composite photocatalyst. The preparation method comprises thefollowing steps: preparation of rodlike cadmium sulfide (CdS NRs), preparation of UIO-66 (NH2) and preparation of a UIO-66 (NH2) doped rodlike cadmium sulfide (CdS@UIO-66 (NH2)) composite photocatalyst. The invention has the following beneficial effects: the preparation method is simple; preparation conditions are easily controllable; and the UIO-66 (NH2) doped rodlike cadmium sulfide (CdS NRs) composite catalyst prepared by using the preparation method provided by the invention has the advantages of no secondary pollution, high photocatalytic efficiency, certain application values, etc.

The invention belongs to the field of functionalized new materials, and particularly discloses high-strength high-toughness antimicrobial polyvinyl alcohol hydrogel, prepared from polyvinyl alcohol and tea polyphenol. The invention also discloses a preparation method of the hydrogel, comprising the following steps: (1) adding polyvinyl alcohol into water to prepare suspension liquid, stirring andincreasing the temperature to 95 DEG C or above to obtain a polyvinyl alcohol water solution; (2) adding the tea polyphenol in the polyvinyl alcohol water solution, and stirring at 90 DEG C or above to obtain mixed liquor of the tea polyphenol and polyvinyl alcohol; (3) transferring the mixed liquor into a die, forming at room temperature, freezing at 0 DEG C or below, and then unfreezing at roomtemperature, wherein a freezing-unfreezing cyclic process is a freezing and thawing circulation; (4) repeating the freezing and thawing circulation. The maximum tensile strength and the maximum elongation at break of the prepared hydrogel are respectively 2.7 times and 2.5 times of those of polyvinyl alcohol hydrogel in which the tea polyphenol is not added, and good antibacterial property is shown.

The invention relates to the technical field of food processing, and especially relates to essence oil microcapsules and a preparation method thereof. The essence oil microcapsules are composed of the following materials: wall materials, a first emulsifier, a stabilizer, and buffer salt. The core of the essence oil microcapsules is composed of the following materials: core materials, and a second emulsifier. The wall materials are composed of the following components: a component A and a component B; the component A is maltodextrin and / or malt syrup; and the component B is whey protein isolate and / or soy protein isolate. The preparation method of the essence oil microcapsules is capable of obviously raising the oil contents of the essence oil microcapsules; and the oil contents of the prepared essence oil microcapsules can be up to 23-35% while the embedding rates are 90% or higher. The preparation method is simple in technology, and low in cost; moreover, the preparation conditions can be easily controlled. The prepared essence oil microcapsule products have good stability, as well as good solubility and dispersion performance. Thus, the essence oil microcapsules can be widely applied in the industries, including the health-care product industry, the pharmaceutical industry, and so on.

The invention discloses a nitrogen and sulfur codoped porous carbon material. The nitrogen and sulfur codoped porous carbon material is prepared by subjecting glucose, melamine, dimethyl sulfoxide andconcentrated sulfuric acid to protonation and performing operations such as heating reaction and calcined activation. According to the nitrogen and sulfur codoped porous carbon material, the range ofthe specific surface area is 1203.9-1932.1 m2 g-1, the mean pore size is uniform in distribution within a range of 1.421-3.627 nm. The preparation method of the nitrogen and sulfur codoped porous carbon material comprises 1) protonation of melamine, 2) preparation of a nitrogen and sulfur-containing precursor, 3) activation of the nitrogen and sulfur-containing precursor, and 4) aftertreatment ofthe nitrogen and sulfur-containing precursor. The invention also discloses application of the nitrogen and sulfur codoped porous carbon material as a supercapacitor electrode material, and when the electric current density is 1 A g-1, the range of the capacitance of the nitrogen and sulfur codoped porous carbon material is 180-293 F g-1. Protonation treatment of the concentrated sulfuric acid onthe melamine adjusts the electron structure of the melamine to produce the nitrogen and sulfur codoped porous carbon material high in content of nitrogen; the dimethyl sulfoxide is high in polarity and hydrophilicity and favorable to doping reaction with hydroxyl of the glucose. Therefore, the prepared nitrogen and sulfur codoped porous carbon material is excellent in electrochemical properties and has an application prospect in the field of supercapacitors.

The invention discloses edible powder tea oil comprising the following components in percentage by weight: 15 to 35 percent of refined tea oil, 40 to 60 percent of maltodextrin, 20 to 40 percent of arabic gum, 0.5 to 2.5 percent of molecular distillation monoglyceride, 0.5 to 2.5 percent of sucrose ester and the balance of water. By adopting a physical pressing method, oil in the tea seeds is extracted; by low-temperature refining, suitable emulsification and homogenization, a convenient and economical spraying drying method is successfully applied to the preparation of the powder tea oil; the process is simple and feasible; the preparation conditions are easily controlled; the edible powder tea oil particles which are obtained by preparation are uniform and similar to spherical shape; the particle size is within 10 to 40 Mum; the refined tea oil content in the powder is 100 to 300mg / g; the micro-encapsulation efficiency reaches over 90 percent; the solubility and the thermal stability are good; the defect of limited application due to the insolubility of the tea oil in water is avoided; and the edible powder tea oil can be widely applied to food, medicine, cosmetics and other industries.

The invention relates to a method for preparing flame retardant magnesium hydroxide. The method is characterized by using undercalcined magnesia powders as raw materials, adding the undercalcined magnesia powders into water containing a composite dispersing agent, stirring and hydrating at a certain temperature for a certain time, and performing a hydrothermal crystallization in a pressure reaction kettle for a certain time. Flame retardant magnesium hydroxide powders with a high dispersibility can be obtained by filtering and drying materials which are subjected to the hydrothermal crystallization, and a filter liquor can be added with a proper amount of water and the dispersing agent to be recycled as water and the dispersing agent in the hydrating. By means of the method, the prepared flame retardant magnesium hydroxide is flaky with the high dispersibility, and the defects of a poor dispersibility, a large specific surface area, easy conglomeration and the like of common magnesium hydroxide in materials such as plastics or rubbers and the like are overcome. According to the method, the sources of required raw materials are rich, the used device and process are simple, and the production cost is low. The prepared flame retardant magnesium hydroxide with the high dispersibility can be widely applied to various industrial production processes.

The invention relates to a preparation method of a LaFeO3 / ZnIn2S4 composite photocatalyst. The preparation method comprises the following steps: preparing flower ball-shaped zinc indium sulfide ZnIn2S4 through a hydrothermal method, preparing flake-shaped lanthanum ferrite LaFeO3 through a sol-gel method and preparing a LaFeO3 / ZnIn2S4 composite material through an in-situ growth method. The preparation method is simple; the preparation condition is easily controlled; the prepared LaFeO3 / ZnIn2S4 composite catalyst has the advantages of no secondary pollution and high photocatalytic efficiency,and has a certain application value.

The invention provides a low-temperature SCR (Selective Catalytic Reduction) denitration catalyst taking La-doped TiO2 as a carrier and a preparation method, and belongs to the technical field of an oxide low-temperature SCR catalyst. The low-temperature SCR denitration catalyst takes the La-doped TiO2 as the carrier and is loaded with V2O5 and MoO3 as active components of the catalyst; the mass of La2O3 in the catalyst is not greater than 15% of the mass of the TiO2; and the loading amounts of the V2O5 and the MoO3 are 0-10wt% and 0-10wt%. A preparation process of the catalyst comprises the following steps: after preparing the La-doped TiO2 carrier by using a sol-gel method, loading the V2O5 and the MoO3 by using an impregnation method; and drying, roasting and grinding to obtain the product. The preparation process is simple and reaction conditions are moderate; the specific surface area of the catalyst is enlarged and the dispersion of grains is uniform; and the activity of the La-doped catalyst is obviously higher than that of an un-doped catalyst.

The invention relates to a preparation method for a cadmium sulfide quantum dot / carbon nanotube photocatalyst taking polyvinylpyrrolidone as a dispersant. The preparation method comprises: pre-treatment of a carbon nanotube and preparation of a cadmium sulfide quantum dot / carbon nanotube composite photocatalyst . The preparation method provided by the invention has the benefits that the preparation method is relatively simple, the preparation conditions are easy to control, and the prepared cadmium sulfide quantum dot / carbon nanotube photocatalyst is a green and environmental-friendly high-performance catalyst which is free of pollution and high in catalytic efficiency, and has certain application value.

The invention relates to a method for preparing a solid ferric oxide-loading activated carbon Fenton's reagent. The method includes fully mixing activated carbon pretreated with acid and an iron salt,and then performing high-temperature calcination. The obtained product is a solid particle substance that is ferric oxide-loading activated carbon. The method overcomes problems that traditional Fenton's reagents cannot be recovered, that iron mud formation from added iron ions requires secondary treatment, and that catalytic degradation activity is highly dependent on acidic environment conditions, and the like. The method is simple in process and low in cost, and the prepared product has advantages including stable chemical properties, no harm to environment, low iron ion dissolution rates,capability of activating hydrogen peroxide and persulfate to achieve catalytic degradation of organic matters, and high efficiency and high speed during application under neutral conditions.

This invention relates to a preparation method for high sintered active InO powder doped with tin including the following steps: adding an organic complexing agent into a solution composed of Sn source, In source and deionized water, in which, the mol ratio of organic complexing agent and the metal ions is (0.25-5):1, then adding ammonia to adjust the pH value to 4-12, finally, putting it into a reactor for hydrothermal reaction for 3-24 h and the reacted materials are cleaned, dried and heat-processed to get the product, which is advantaged that the size of the produced ITO powder is 6-25 nm, the specific area reaches to 30-80m2 / g, the produced ITO powder gets fine sintered activity (reaching to 98.7% relative density at the maximum when being sintered under 1200deg.C and normal pressure).

The invention relates to a thermally stable precious metal-doped three-dimensional ordered macroporous-mesoporous three-way catalyst as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalysis. The molecular formula of the catalyst is Ce(0.7-x)Zr0.3MxO2, wherein x is greater than 0 but less than 0.1 and M is a precious metal element which enters cerium-zirconium solid solution lattices. The catalyst has a three-dimensional ordered macroporous-mesoporous structure and the pore wall of the macropore is formed by vermiform mesopores. The preparation method comprises the following steps: firstly by taking polymethyl methacrylate microspheres as a hard template, a triblock copolymer as a soft template, ethanediol as an additive and absolute methanol as a solvent, dipping a PMMA hard template by virtue of a mixed solution containing the soft template, the additive, the solvent and soluble metal salt; crystallizing and drying in a constant temperature humidity chamber; and raising the temperature in a programmed manner and roasting to obtain a product. The catalyst provided by the invention has good three-way catalytic activity and high-temperature thermal stability and has a good application prospect in the field of catalysis and purification of motor vehicle exhaust.

The invention relates to a nano composite membrane photo-anode, in particular to preparation of a ZnFe2O4 / TiO2 nano composite membrane photo-anode used for photo-induced cathodic protection. Preparation is completed through the steps that firstly, a TiO2 nanotube array membrane is obtained through an anodic oxidation method; and secondly, the TiO2 nanotube array membrane is loaded with ZnFe2O4 nano particles through a hydrothermal method. The ZnFe2O4 / TiO2 composite membrane prepared through the method has the characteristic that a coating is complete and uniform, can be used as a photo-anode for utilizing visible light; the connected and protected metal electrode potential during light irradiation is greatly lowered; and when a light source is turned off, the nano composite membrane photo-anode can still have a certain cathodic protection effect on metal in a dark state.

Present invention relates to a liquid phase chromatography column and preparation method, which includes one elastic quartz capillary without adhesive joining. It features middle of said capillary set with integral stationary phase formed by organic polymer in situ polymerization and modified by weak acid cation, lower reaches of said stationary phase set with detect window removing coated surface polyimide. Said invented includes 1, to proceed general pretreatment to elastic quartz inner wall, 2, making integral stationary phase basal body using monomer mixture, porogenic agent mixture and initiator, 3, modifying stationary phase basal body by modifier to obtain subacidity cation exchange integral stationary phase, 4, making detect window to obtain subacidity cation exchange capillary liquid phase chromatography column. Said invention has los price, easy to control preparing condition, fine reproduction quality, fine consistency with biological sample, suitable for biomacromolecule sample isolation analysis.

The invention provides a waterborne ultraviolet-heat dual-cured coating. The coating comprises the following components in part by weight: 20 to 42 parts of epoxy resin, 6.5 to 48.8 parts of waterborne epoxy acrylate oligomer, 31 to 63 parts of waterborne curing agent, 2.9 to 7.5 parts of photoinitiator, 0.9 to 3.5 parts of leveling agent and 0.5 to 2.0 parts of defoaming agent. The waterborne ultraviolet-heat dual-cured coating has high hardness and is foam-resistant and environment-friendly, and toxic and harmful gas is not released. The invention also provides a preparation method for the waterborne ultraviolet-heat dual-cured coating.

The invention belongs to the technical field of nanometer materials, and discloses a method for controllably synthesizing tantalum-based nitride (nitrogen oxide) nanoparticles, and nanoparticles thereof. The method comprises: dissolving a tantalum salt in an organic alcohol, adding an alkaline earth metal salt and an organic nitrogen source, stirring to obtain a precursor, placing into an inert atmosphere, carrying out high temperature calcination, and treating with a hydrochloric acid solution to obtain the tantalum-based nitride (nitrogen oxide) nanoparticles. According to the present invention, the method has advantages of mild condition and environmental protection, and breaks through the safety hazard and the limitation caused by the traditional method using NH3; by simply regulating the nitrogen source consumption, the precise control of the product nitrification degree is achieved; by effectively regulating the density of the empty orbit unoccupied by d in the tantalum, the product has the catalysis property similar to the precious metals; and the obtained nanoparticles have wide application prospects in the fields of benzene hydrogenation, Fischer-Tropsch synthesis, hydrodesulfurization / hydrodenitrification, alcohol decomposition-hydrogen production and other fine chemical industry catalysis reactions, fuel cell electrode catalysis materials, sensors, electrical materials, and other fields.

The invention relates to a nanoporous-structure oxygen evolution catalyst with iridium oxide enriched on the surface and a preparation method for the oxygen evolution catalyst, and relates to the electrochemical field. The nanoporous-structure oxygen evolution catalyst with iridium oxide enriched on the surface can be obtained by adding a Co precursor into an Ir precursor and performing hydrolysisreaction, pyrolysis treatment and an acid etching process. The preparation method for the nanoporous-structure oxygen evolution catalyst with iridium oxide enriched on the surface comprises the following steps: adding the Co precursor into the Ir precursor, and performing hydrolysis reaction, pyrolysis treatment and the acid etching process, thereby preparing the catalyst, wherein conditions in apreparation process are controllable. The oxygen evolution catalyst which has the nanoporous structure, a high specific surface area and an IrO2 surface enrichment structure, has excellent oxygen evolution reaction catalysis activity and excellent stability. Besides, cheap Co is added so that the cost of the catalyst can be effectively reduced, and therefore, the oxygen evolution catalyst has a wide application prospect.

The invention relates to a preparation method of an epoxy resin-based micro-filtration film. Firstly, under a certain temperature, the epoxy resin and amines such as diethylene triamine or triethylenetetramine is completely dissolved in polyethyleneglycol medium by a certain weight ratio, and the air bubble is then removed; the solution is cast or flow-cast on supporting material such as metal or plastic tape, and suitable temperature is kept. After a certain time, monomer solution generates polymerization and phase separation at the same time; gel is solidified as white epoxy resin-based nascent state film; the nascent state film is finally dipped in water, and the medium polyethyleneglycol is removed to obtain the micro-filtration film. Other organic solvents are not required to be added in the preparation process, with green environmental protection. The prepared micro-filtration film has good mechanical strength, uniform distribution of aperture, adjustable size, strong hydrophilicity, acid resistance, alkali resistance and solvent resistance; furthermore, the structure of the film is not damaged by high-temperature germicidal treatment under the temperature of 120 DEG C; the film has excellent performance and the method of the invention can be widely applied to the separation and filtration in the industries such as instrument analysis, water disposal and biological medicine, etc.

The invention belongs to a novel energy material, and particularly relates to a method for preparing a nanometer lithium iron phosphate / carbon compound with stable low temperature performance. The method comprises the following steps of: mixing an iron source, a lithium source, a phosphorous source and a compound carbon source according to a certain proportion; performing ball milling; drying; and calcining in an inertial atmosphere to obtain a lithium iron phosphate / carbon compound, wherein the particle size is smaller than 150 nanometers; carbon is uniformly coated on the surfaces of particles; the thickness of a carbon layer is about 2 nanometers; and the compound carbon source plays an important role in controlling a material structure. After the material is assembled into a button cell, the discharging capacity is 160mAh / g at the rate of 0.1C at the room temperature, the discharging capacity is 126mAh / g at the rate of 0.1C at the temperature of 20 DEG C below zero, and the capacity conservation rate is still over 97 percent after 500 cycles at the rate of 0.6C at the temperature of 20 DEG C below zero, so that the problem of unstable low temperature performance of a lithium ion battery is solved. The method has the advantages of low cost, simple production process and high safety, and the prepared compound can be applied to the field of portable equipment, power electric vehicles and the like.

The invention relates to a purification method of acetyl pullulan polysaccharide folate conjugate and a preparation method of nanometer particles thereof. Folate, acetyl pullulan polysaccharide solution, 4-dimethylaminopyridine (DMAP) and a carbodiimide dehydrating agent are mixed for reaction for 5 to 7 days at the temperature of 25 to 28 DEG C, excessive absolute ethyl alcohol is dropwise added into filter liquor for sedimentation, and centrifugation is carried out, the sediment is collected, is dialyzed for 24 to 48 hours by sodium carbonate buffer solution and is dialyzed for 24 to 48 hours in deionized water, and a material is obtained through freezing-drying or vacuum drying. The material is dissolved in dimethyl sulfoxide (DMSO) or other organic solvents, and a dialysis method is adopted for preparing the nanometer particles. The invention has less steps, simple operation and good repeatability and dose not need other stabilizing agents and emulsifiers, and the nanometer particles are in ball shapes, have uniform grain sizes, low absolute potential, and good stability, and do not have significant toxicity for single mainline to mice.

The invention discloses a copper-based catalyst and a preparation method and application thereof. The preparation method of the copper-based catalyst comprises the following steps that 1, a solution formed by soluble salt of copper, zinc and aluminum and a solvent and a solution formed by ammonium precipitator and a solvent are mixed and subjected to a precipitin reaction, and a coprecipitate precursor is obtained; 2, the coprecipitate precursor is aged, filtered, washed, dried and calcined to obtain coprecipitate; 3, the coprecipitate is tableted, or the coprecipitate and graphite are mixed and tableted to obtain the copper-based catalyst. No precipitator containing alkali metal ions is adopted in the preparation method, waste water pollution is avoided, the conditions are easier to control, preparation repeatability is good, the preparation cost of a fatty alcohol dehydrogenation catalyst can be reduced, and industrial potential is achieved. According to the copper-based catalyst, the specific surface area of the catalyst can be effectively increased, the dispersity of active ingredients on a carrier can be improved, and catalytic activity, selectivity and stability can be improved.