33results about How to "The preparation method is safe" patented technology

The invention belongs to the technical field of solid-state lithium batteries, and particularly relates to a flame-retardant solid-state electrolyte as well as a preparation method and application thereof. The flame-retardant solid electrolyte is obtained by taking a first monomer with a polyhedral oligomeric silsesquioxane structure and a second monomer with an ethylene glycol dimethacrylate structure as polymeric monomers and performing in-situ polymerization on the polymeric monomers, a lithium salt as an active substance, a functional additive organic phosphorus flame retardant, a polymerization reaction initiator and an organic solvent. The flame-retardant solid electrolyte has an extremely strong electrolyte retention effect and good flame retardance, can take the electrochemical performance and the mechanical performance of the electrolyte into account, shows high cycling stability in a lithium metal battery, and is of great significance in development of a safe and high-performance solid-state battery.

According to the method, a one-pot copolymerization method is adopted, MBAA and borax serve as cross-linking agents, zwitterionic polyelectrolyte hydrogel containing SBMA, PVA, THMA and AMPS is prepared, and the zwitterionic polyelectrolyte hydrogel has excellent adhesion performance and biocompatibility and is suitable for the field of biological medicine. According to the method, the physical characteristics of the hydrogel are enhanced due to crosslinking sites and hydrogen bonds of polyvinyl alcohol. The cationic and anionic groups of SBMA improve the adhesion performance, and the reaction monomer THMA provides hydrogen-bond interaction to further promote adhesion, so that the prepared hydrogel adhesive shows excellent adhesion performance and biocompatibility, and is suitable for biological medicine application of wound dressing, drug release systems, tissue engineering and the like.

The invention discloses an automobile static temperature control system of a coupled radiation refrigeration automobile cover and a phase change heat storage module, and belongs to the field of heat management materials. A radiation refrigeration automobile cover covers an automobile, a phase change heat storage module is placed in the automobile, when temperature rises in the daytime, most heat is isolated by the radiation refrigeration automobile cover by reflecting solar radiation, high-density infrared radiation and low thermal conductivity, and when remaining heat enters a compartment, the interior of the compartment is kept in a low-temperature state through constant-temperature absorption of the phase change heat storage module; when the air temperature drops and at night, heat stored by the phase change heat storage module is quickly transmitted to the outside through high-density infrared radiation of the radiation refrigeration car cover, so that the interior of the compartment is in a low-temperature state. Under the dual-function coupling effect, the low-temperature state in a compartment is achieved, automobile starting temperature control energy consumption is reduced, the comfort degree of a human body is improved, and the risks of aging of elements in an automobile and spontaneous combustion of a power battery caused by high temperature are reduced.

The invention discloses a synthesis method of 5-nitrotetrazole sodium salt, and solves the problem of relatively large potential safety hazard in the synthesis process of 5-nitrotetrazole sodium in the prior art. The method for safely preparing the high-energy compound 5-nitrotetrazole sodium salt based on DAT comprises the following steps: adding 1, 5-diamino tetrazole into a certain amount of ice water and acid to dissolve 1, 5-diamino tetrazole; slowly dropwise adding a sodium nitrite solution into the ice-water mixture solution, and uniformly stirring at a certain temperature; slowly heating the mixture to a certain temperature, and reacting for a period of time to obtain filtrate; removing filtrate to obtain white powder; and dissolving the obtained white powder in acetone, filtering to obtain a solution, and removing the solvent to obtain the 5-nitrotetrazole sodium salt. The preparation method provided by the invention is simple, safe and mild in reaction condition; water is used as a solvent, so that environmental pollution is avoided, and environmental protection requirements are completely met; and dangerous intermediates such as tetrazole-5 diazonium salt and 5nitrotetrazole acid copper salt are not generated.

The invention relates to the technical field of electronic glass, in particular to heat-resistant stable alkali-free boroaluminosilicate glass with high crystallization margin and a preparation method of the alkali-free boroaluminosilicate glass. The alkali-free boroaluminosilicate glass with heat resistance, stability and high crystallization margin is prepared from the following raw materials in percentage by mole: 68.54 to 72.82 percent of SiO2, 11.84 to 13.5 percent of Al2O3, less than or equal to 2.23 percent of B2O3, 4.72 to 6.6 percent of MgO, 4.65 to 5.8 percent of CaO, 0.8 to 1.5 percent of SrO, 3.2 to 3.79 percent of BaO and 0.1 percent of SnO2, the ratio of SiO2 to Al2O3 is 81.63 to 84.66 percent, and the ratio of (MgO + CaO + SrO + BaO) to Al2O3 is 1.15 to 1.30. The alkali-free boroaluminosilicate glass obtained in the invention has a high strain point and crystallization margin, and also has high heat-resistant stability and devitrification resistance.

The invention belongs to the technical field of photocatalytic materials, and particularly discloses a CeO2 / Zn0. 5Cd0. 5S composite photocatalyst with a 2D / 0D structure as well as a preparation method and application of the CeO2 / Zn0. 5Cd0. 5S composite photocatalyst with the 2D / 0D structure. The preparation method comprises the following steps: S1, preparing CeO2 nanosheets; s2, preparing a CeO2 nanosheet suspension liquid; s3, preparing a mixed solution of cadmium acetate and zinc acetate; s4, preparing a sodium sulfide solution; and S5, according to a certain proportion, dropwise adding the mixed solution of cadmium acetate and zinc acetate obtained in S3 into the CeO2 nanosheet suspension obtained in S2, stirring, slowly dropwise adding the sodium sulfide solution obtained in S4, carrying out ultrasonic treatment, stirring, centrifuging, washing, and freeze-drying to obtain the CeO2 / Zn0. 5Cd0. 5S composite photocatalyst. According to the CeO2 / Zn0. 5Cd0. 5S composite photocatalyst with the 2D / 0D structure as well as the preparation method and the application of the CeO2 / Zn0. 5Cd0. 5S composite photocatalyst, the operation is simple, the cost is low, 0D Zn0. 5Cd0. 5S nanoparticles are uniformly distributed on the surface of a 2D CeO2 nanosheet, a CeO2 / Zn0. 5Cd0. 5S heterojunction is formed between Zn0. 5Cd0. 5S and CeO2, and separation and migration of photon-generated carriers can be greatly promoted.

The invention provides a magnesium alloy hydrogen storage material and a preparation method thereof, and particularly relates to the technical field of hydrogen storage alloys. The chemical formula of the magnesium alloy hydrogen storage material is Mg < 100-a-b-x-y > Ni Zr Na < x > Ce < y >, wherein 10 < = a < = 20; 0.1 < = b < = 2; 0.1 < = x < = 2; 1 < = y < = 15. According to the magnesium alloy hydrogen storage material, the element cerium is added into the magnesium alloy, the cerium element reacts with hydrogen to generate stable CeH2.73, the compound always exists in the whole hydrogen charging and discharging process, an additional channel is provided for diffusion of hydrogen atoms, and the migration rate and efficiency of the hydrogen atoms are remarkably improved. The stable compound plays a role of a catalyst, the activation energy of the magnesium-based material is reduced, and the adsorption and release of hydrogen are promoted, so that the hydrogen charging and discharging performance is improved.

The invention belongs to the technical field of microecological preparations, and particularly provides a microcapsule wall material which comprises the following components in percentage by mass of water: 4-6% of denatured protein, 1.5-2.5% of sodium alginate and 1.5-2.5% of calcium carbonate. The protein comprises at least one of whey protein isolate and soybean protein isolate. Based on the microcapsule wall material, the invention provides the acid-resistant, cholate-resistant and heat-resistant lactic acid bacteria microcapsule and the preparation method thereof. According to the microcapsule wall material provided by the invention, the protein raw material is subjected to denaturation pretreatment and then is compounded with the sodium alginate and the calcium carbonate, so that compared with the traditional wall material sodium alginate, the microcapsule wall material provided by the invention has the advantages that the embedding rate and the stability can be improved, and the acid resistance, cholate resistance, heat resistance and storage stability of an embedded product are also greatly improved.

The invention provides a preparation method of a perovskite thin film, and the method comprises the steps: providing an initial film layer which comprises a first surface and a second surface which are opposite to each other; a coating material is provided, the coating material comprises lead halide and a pore-forming agent, and the pore-forming agent has dehydration property; the coating material forms a porous lead halide framework layer with preset porosity on the first surface of the initial film layer through an evaporation process; coating one side, deviating from the initial film layer, of the porous lead halide framework layer with an organic amine salt mixed solution, and reacting to form an initial perovskite thin film; and performing first type annealing treatment on the initial perovskite thin film to form the perovskite thin film. By adopting the method, the film forming quality of the perovskite film can be effectively improved, and the electrical property of the solar cell can be ensured and improved. The invention also discloses a perovskite cell, a laminated cell and a preparation method thereof.

The invention provides composite silver soldering paste and a preparation method and application thereof.The preparation method comprises the following steps that silver nitrate and PVP are dissolved in an ethylene glycol solution, and stirring is conducted for 20-45 min through a constant-temperature magnetic stirrer at the temperature of 45-75 DEG C; adding a certain amount of HCl into the mixed solution, magnetically stirring for 15-30 minutes, and cooling to room temperature; putting the mixture into a reaction kettle, and performing vacuum constant-temperature heating for 150-200min at 100-190 DEG C; and after washing with deionized water and absolute ethyl alcohol, carrying out ultrasonic treatment to obtain the composite silver soldering paste. According to the multi-scale composite silver soldering paste, an ethylene glycol reduction method is adopted, silver ions in a solution are reduced into silver atoms, submicron or micron particles are secondarily grown on the basis of nano-silver particles, and the multi-scale composite silver soldering paste is prepared and has better electrical and mechanical properties; the multi-scale silver particles are easy to generate, the reaction conditions are easy to control, the preparation method is simple, safe and environmentally friendly, the needed raw material types are few, the number of devices is small, few organic matter is added, and the nano-silver particles controllable in morphology and size are easy to obtain.

The application discloses a preparation method and application of a pyridine derivative compound, belongs to the technical field of chemical synthesis, and has the structural formula as shown in the following formula: wherein the R1 group is one of 4-CH3, 4-OCH3, 4-F, 4-Cl and 4-Br; the R2 group is one of -C5H9 and -C6H 11 ; and the R3 group is one of 3-F, 3-H and 3-CH3. The pyridine derivative compound prepared by the application has a pyridine ring as a structural center and has very important medicinal value and is widely applied in the fields of antitumor, anticancer, antibacterial and other biological medicines.

The invention belongs to the technical field of biological enzyme engineering, and particularly relates to a glycosyl transferase mutant and application thereof in synthesis of rebaudioside M. According to the invention, site-directed mutagenesis is carried out on an amino acid sequence SEQ ID NO.1 of wild type glycosyl transferase, and mutants: I29M, L149C and F374C are obtained through screening; the invention also provides a nucleic acid sequence for coding the mutant, an expression vector and a recombinant strain which are used for catalytically converting rebaudioside D to prepare rebaudioside M, and the conversion rate is obviously improved. Experimental results show that under optimized reaction conditions, the mutant can increase the conversion rate of converting rebaudioside D into rebaudioside M to 100%, which is increased by more than 30% compared with a wild type, and the mutant has significant industrial application value.

The invention provides a traditional Chinese medicine formula for improving male horse fecundity, and relates to the technical field of additives. The traditional Chinese medicine formula for improving the reproductive capacity of the male horses specifically comprises the following components in parts by weight: 10-15 parts of cherry leaves; 5-7 parts of cherry tree roots; 10-20 parts of Chinese wolfberry fruits; 5-10 parts of beautiful millettia root; 5-10 parts of eucommia ulmoides; 15 to 30 parts of actinolite; 15 to 30 parts of actinolitum brevifolium; 10 to 15 parts of Angora bark; 6-10 parts of cynomorium songaricum powder; 11 to 16 parts of herba epimedii; 8-10 parts of honey; 5 to 6 parts of melatonin; 6-8 parts of organic zinc; comprising an additive, wherein the component amount of the carrier is 200-300 parts. By reasonably selecting traditional Chinese herbal medicines and adding byproducts, the semen quality and ejaculation amount of male horses can be remarkably improved, the breeding capacity is enhanced, the composition has the characteristics of wide source, diversified functions, no residue, no toxic or side effect and the like, meanwhile, the composition is precise and appropriate in compatibility and exerts a synergistic effect, and the efficacy activity is obviously superior to that of each single component.

The invention relates to the technical field of biological medicine, in particular to a method for preparing memory natural killer cells by using peripheral blood mononuclear cells and application of the memory natural killer cells. According to the preparation method, the mononuclear cells are prepared by using peripheral blood, and a cytokine composition A and a cytokine composition B are added in the amplification process; the amplified cells containing the mNK cells are obtained. A detection result shows that the preparation method provided by the invention can activate and proliferate a large amount of NK cells in mononuclear cells, and the activated NK cells show memory-like characteristics of adaptive immunity, have stronger capability of killing cancerous cells, and can stimulate mNK cells to generate stronger expression of IFN-gamma and granzyme, so that the cancerous cells can be effectively killed. The two components cooperate to enable the mNK cell to play an anti-tumor role, and the mNK cell provided by the preparation method is expected to be applied to medicine preparation.

The invention discloses a method for preparing a puncture-resistant and strong acid-base resistant aramid composite fabric, comprising the following steps: spreading a composite coating solution on the aramid fabric, drying it, and obtaining the aramid composite fabric. The preparation method of the composite coating solution comprises the following steps: uniformly mixing inorganic particles and anhydrous ethanol to obtain solution A, uniformly mixing solution A and ammonia water under stirring conditions to obtain solution B, adding perfluorooctyl triethoxysilane to the solution B, stirring at 40 to 60° C. for 4 to 12 hours, cooling to room temperature, washing, and drying to obtain modified inorganic nanoparticles, adding modified inorganic nanoparticles to solution C under stirring conditions, stirring at 40 to 100° C. for 20 to 25 hours to obtain a composite coating solution, and using the composite coating solution of the invention to enhance the aramid fabric can simultaneously have super-hydrophobicity, puncture resistance, and strong acid-base resistance, and the super-hydrophobic composite coating has excellent mechanical stability and chemical robustness.

The invention relates to a tunneling passivation structure. The tunneling passivation structure comprises a MnTiO3 layer, a first doped poly layer, a silicon oxynitride layer and a second doped poly layer which are sequentially arranged on the backlight surface of a silicon substrate. The tunneling passivation structure provided by the invention comprises a MnTiO3 layer, a first doped poly layer, a silicon oxynitride layer and a second doped poly layer which are arranged in sequence, on one hand, the thickness of MnTiO3 and the thickness of silicon oxynitride correspond to the change of a band gap, and the change is much smaller than that of silicon dioxide; on the other hand, MnTiO3 serves as a bottom tunneling layer field and is prepared only through a process, thickness control is not affected by other factors of the environment and is more accurate, silicon oxynitride field is prepared only through the process, thickness control is not affected by other factors of the environment and is more accurate; meanwhile, due to the laminated design of the tunneling passivation structure, the propulsion rate of phosphorus is inhibited to a certain extent, and serious compounding caused by excessive propulsion of doping atoms on the silicon substrate is avoided.

The invention discloses a preparation method of an anti-aging abalone extract, application of the anti-aging abalone extract and a product, and the preparation method is characterized by comprising the following steps: uniformly mixing abalone powder with low-concentration ethanol to obtain a mixture, and carrying out enzymolysis on the mixture to obtain abalone enzymatic hydrolysate; separating and purifying the obtained abalone enzymatic hydrolysate to obtain enriched liquid; and concentrating the obtained enriched solution to obtain a concentrated solution. According to the method, a low-concentration ethanol enzymolysis technology is creatively used, and the abalone powder is subjected to enzymolysis in a low-concentration ethanol solution by utilizing alcohol-resistant neutral protease, so that effective active ingredients can be released, and impurities can be removed, thereby facilitating enrichment and purification of the active ingredients. According to the preparation method provided by the invention, the cost is reduced, the working section is reduced, and meanwhile, the preparation method is safer due to low-concentration ethanol and no need of adding an acid-base reagent in the working section to adjust the pH value.

The application discloses diatomite-derived silicon-carbon negative electrode material and a preparation method thereof and application in lithium ion batteries, and belongs to the technical field of lithium ion battery negative electrode materials. The method discloses the diatomite and the pitch as raw materials by adopting magnesium heat treatment, and the diatomite-derived silicon-carbon negative electrode material is obtained through specific composite process and calcination treatment. The method can uniformly coat the carbon material on the inner and outer surfaces of the porous micron-sized silicon negative electrode, solves the technical problems of the existing silicon-carbon negative electrode material nano-particle agglomeration and the carbon material coating only on the outer surface, and achieves the beneficial effects of further improving the conductivity and structural stability of the composite material.

The present invention relates to the technical field of preparation of co-production of chromium trichloride hexahydrate and ferric chloride hexahydrate, and specifically to a preparation method of co-production of chromium trichloride hexahydrate and ferric chloride hexahydrate. The preparation method of co-production of chromium trichloride hexahydrate and ferric chloride hexahydrate of the present invention adopts chromium trioxide, refined iron powder and hydrochloric acid as raw materials, and simultaneously produces ferric chloride hexahydrate and chromium trichloride hexahydrate. After the reaction is completed, according to the different crystallization temperatures of the products, chromium trichloride hexahydrate and ferric chloride hexahydrate are respectively obtained by concentration crystallization, filtering and drying. The present invention provides a preparation method of co-production of chromium trichloride hexahydrate and ferric chloride hexahydrate, and chromium trichloride hexahydrate and ferric chloride hexahydrate are simultaneously prepared with high efficiency, and the steps are simple, time-saving and labor-saving, green and environmentally friendly, and cost-saving.

The invention relates to the technical field of energy storage battery electrolyte, and particularly discloses a preparation method of iron-chromium flow battery electrolyte, which comprises the following steps: by taking high-purity iron powder, hydrochloric acid and chromic anhydride as raw materials, carrying out chemical reaction under specified conditions to generate ferric trichloride and chromium trichloride. And after the reaction is finished, continuously adding high-purity iron powder to completely convert the ferric iron into ferrous iron, and finally supplementing the balance of required chromium chloride and hydrochloric acid, thereby directly preparing the required qualified iron-chromium flow battery electrolyte. The required iron-chromium flow battery electrolyte can be simply and efficiently prepared, and compared with a traditional chlorine salt compounding process, the production link is simplified, and the production cost is reduced. The preparation method disclosed by the invention is simple in process, time-saving and labor-saving, free of any emission and more environment-friendly.

The present invention relates to a grouper NNV and TGIV dual immersion nano vaccine and a preparation method and application thereof, belonging to the field of biomedicine technology. The vaccine grouper neural necrosis virus dominant antigen NNV-MCP and grouper iridovirus dominant antigen TGIV-MCP are connected in series through a connecting peptide and then fused with the N-terminus of the grouper ferritin H subunit. The vaccine of the present invention can produce protective antibodies in the fish body by immersion, improves the immune efficacy, and can effectively prevent grouper neural necrosis disease and iridovirus disease.

The synthesis method comprises the following steps: performing epoxidation reaction on a compound IN1 to obtain a 3-position epoxy isomer mixture IN2, then adding the IN2 into petroleum ether or methanol, stirring, filtering to remove non-target configurational isomers, concentrating filtrate, cooling, and separating out solids to obtain an epoxy product; the structural formulas of the compounds IN1 and IN2 are as follows: # imgabs0 # imgabs1 #. According to the preparation method, a dangerous and expensive aluminum reagent is avoided, isomer impurities are removed through improvement of the method, the preparation method is green and safe, part of steps can be directly put into the next reaction step without purification, the operation is simple, and the preparation method is suitable for industrial production.

The invention discloses a special anticorrosive coating for outdoor sports equipment and a preparation method thereof, which belongs to the technical field of anticorrosive coatings and comprises the following raw materials: water-based amino resin, water-based alkyd resin, graphene, modified nano titanium dioxide, iron powder, chromium powder, film-forming aid, defoamer, cosolvent, dispersant, emulsifier and solvent. The preparation method comprises the following steps: after mixing water-based amino resin and water-based alkyd resin with solvent, adding a solid powder mixture of graphene, modified nano titanium dioxide, iron powder and chromium powder to disperse evenly, then sequentially adding cosolvent, dispersant, emulsifier and film-forming aid to stir evenly, and finally adding defoamer to defoam. The raw materials in the present invention cooperate with each other, improve the salt and alkali resistance of the anticorrosive coating, and improve the weather resistance of the product at the same time, and the preparation method is simple, safe, does not pollute the environment, and the construction is relatively environmentally friendly and convenient. It takes water as the medium, is safe, non-toxic, does not cause harm to the human body, and is environmentally friendly.

The invention provides a method for preparing a silicon carbide-graphene heterostructure filler and application of the silicon carbide-graphene heterostructure filler in an interface self-adaptive heat-conducting composite material, and belongs to the technical field of composite materials, and the method comprises the following steps: (1) adding silicon carbide into water, stirring, carrying out ultrasonic treatment, centrifugally washing and drying to obtain hydroxylated silicon carbide powder; (2) adding graphene into water, homogenizing, adding TCEP and HEPES, stirring to prepare a dispersion liquid A, mixing lysozyme, HEPES and water to prepare a solution B, adding the solution B into the dispersion liquid A, and reacting to prepare lysozyme modified graphene powder; and (3) mixing the lysozyme modified graphene powder with hydroxylated silicon carbide for reaction to prepare the silicon carbide-graphene heterostructure filler. According to the invention, the high-thermal-conductivity silicon carbide-graphene heterostructure filler is prepared by means of surface modification and chemical crosslinking. The preparation method is green, rapid and safe, and can be applied to the technical field of multiple composite materials.

The invention discloses a lithium ion battery diaphragm and a preparation method thereof, and belongs to the technical field of lithium ion battery materials, the lithium ion battery diaphragm comprises a base membrane and a functional coating coated on at least one side surface of the base membrane; the functional coating comprises nanofibers and inorganic particles; the nanofibers are of a nonlinear structure, the nanofibers of the nonlinear structure are interwoven, interwoven and wound to form a graded porous structure, and the graded porous structure is filled with the inorganic particles. According to the invention, the nonlinear nanofiber is used as a skeleton support and is filled with the inorganic particles, so that the particles are more difficult to fall off when the diaphragm is mechanically damaged, and the liquid retention property of the diaphragm can also be improved; meanwhile, due to the nonlinear fiber structure, the inorganic particle coating capacity of the nanofibers is enhanced, relative movement between the fibers can be limited, the thermal stability and mechanical performance of the diaphragm are improved, the density of the diaphragm can be reduced, and the energy ratio of the battery can be increased.

According to the europium-doped sodium lithium phosphate photoluminescence material and the preparation method thereof, the preparation raw materials and the preparation method are simple, safe and low in cost, a powder sample shows good characteristics of the photoluminescence material, a photoluminescence signal has high sensitivity and stability, and the photoluminescence signal has high sensitivity and stability by adopting the heating temperature of 650-700 DEG C and the heating time of 8-10 h. Higher photoluminescence sensitivity can be obtained; the total photoluminescence response of the synthesized europium-doped sodium lithium phosphate photoluminescence material fluctuates less than 3% within 24 h after irradiation, and the lowest detection limit is 0.68 [mu] Gy, which reaches the international advanced level. According to the invention, the problems of low sensitivity and poor stability of most photoluminescence materials at present can be solved, and a solid guarantee is provided for the accuracy of the material applied to nuclear radiation dose monitoring and traceability.

The present invention provides a method for preparing a sodium vanadium phosphate positive electrode material and its application in preparing a sodium positive electrode material. The preparation method comprises the following steps: mixing and grinding a phosphorus source, a sodium source, and a vanadium source to obtain a ground mixture A; mixing a carbon source and continuing to grind to obtain a ground mixture B; sieving the mixture B, adding an abrasive to rinse, drying and grinding the obtained suspension of a mixed precursor and an abrasive to obtain a precursor powder; sintering the obtained precursor powder to obtain a sodium vanadium phosphate positive electrode material. The method of the present invention is simple to operate and low in cost, and can realize the recycling of phosphorus sources after recycling and processing of waste lithium batteries, generating less waste, being economical and environmentally friendly. The preparation method of the present invention is more direct, convenient, safe, and low-cost. After ball milling, sintering can perfectly realize the preparation of sodium vanadium phosphate by adjusting the amount of carbon source added and the inert gas filling time.

The application discloses a one-pot preparation method of 3,4,5-trifluorobromobenzene. In an organic solvent, 2,6-difluoroaniline is used as raw material to obtain the product 3,4,5-trifluorobromobenzene through three steps of bromination, diazotization and fluorination at a certain temperature. The method has the advantages of multiple raw material sources, obvious cost advantage, safety and convenience, high total yield, less waste and the like, and is beneficial to industrialization.

The invention belongs to the technical field of lithium metal batteries, and particularly discloses a composite lithium metal negative electrode and a preparation method and application thereof. The composite lithium metal negative electrode comprises a copper foil, a high-entropy alloy coating compounded on the surface of the copper foil and lithium metal loaded in the high-entropy alloy coating, wherein the high-entropy alloy coating consists of high-entropy alloy particles, a carbon material and an adhesive. The preparation method comprises the following steps: mixing high-entropy alloy particles, a carbon material and an adhesive to prepare slurry, and coating the surface of a copper foil with the slurry to form the high-entropy alloy coating; and depositing lithium metal in an electrolyte by taking the lithium metal as a working electrode to obtain the composite lithium metal negative electrode. The high-entropy alloy particles have good lithium wettability, the nucleation overpotential of lithium metal can be reduced, the volume effect and dendritic crystal growth are effectively avoided, and the long cycle life is achieved.

The invention discloses a preparation method and application of a pyridine derivative, and belongs to the technical field of chemical synthesis, the structural formula of the pyridine derivative is shown as follows: in the # imgabs0 # formula, the R1 group is one of 4-CH3, 4-OCH3, 4-F, 4-Cl and 4-Br; the R2 is one of-C5H9 and-C6H11, and the R3 is one of-C6H9 and-C6H11; the R3 group is one of 3-F, 3-H and 3-CH3; the pyridine derivative prepared by the invention takes a pyridine ring as a structural center, has very important medicinal value, and has wide application in anti-tumor, anti-cancer, antibacterial and other biological medicines.