1072results about How to "Suppress generation" patented technology

The invention relates to the field of microorganisms, in particular to bifidobacterium adolescentis YG3912, inactivated thalli, an extract, a culture, a culture supernatant, a fermentation product and / or a fermentation supernatant of the bifidobacterium adolescentis YG3912, an application of the bifidobacterium adolescentis YG3912 in preparation of a composition for promoting skin repair, reducing skin inflammation or allergy, improving skin quality and improving skin quality. The invention also relates to application of the composition in products for resisting skin aging and enhancing skin immune function. The bifidobacterium adolescentis YG3912 and the related products thereof have the advantages that the bifidobacterium adolescentis YG3912 and the related products of the bifidobacterium adolescentis YG3912 are high in skin cell repairing capacity, skin inflammation relieving, inhibiting or eliminating capacity and remarkable in skin aging resisting capacity, so that the bifidobacterium adolescentis YG3912 and the related products of the bifidobacterium adolescentis YG3912 are expected to be used for skin health care such as skin repairing, inflammation relieving and light aging resisting, and the bifidobacterium adolescentis YG3912 and the related products thereof have remarkable application value and market potential.

The invention relates to the technical field of secondary batteries, in particular to a conductive composite current collector, a preparation method thereof and a battery. The conductive composite current collector comprises a supporting layer, a metal layer arranged on at least one surface of the supporting layer and a PTC (Positive Temperature Coefficient) bottom coating arranged on the surface, far away from the supporting layer, of the metal layer, the supporting layer comprises a polymer base membrane and conductive fibers dispersed in the polymer base membrane; the PTC undercoat layer includes a conductive polymer and a conductive agent dispersed in the conductive polymer. The conductive composite current collector provided by the invention is high in conductivity and excellent in safety, the probability of thermal runaway of the battery at a high temperature is effectively reduced, and the rate capability and the cycle performance of the battery are improved.

The invention relates to a medicinal and edible composition with anti-aging and whitening effects and application of the medicinal and edible composition. The composition comprises a raspberry extract, a guava extract, a rose extract and a liquorice extract. According to the composition, active ingredients of natural plants are utilized, and the anti-aging effect is achieved by inhibiting the activity of collagenase and elastase and promoting the generation of collagen and elastase; by inhibiting the activity of alpha-glucosidase and directly inhibiting generation of AGEs, aging caused by skin saccharification is prevented; the whitening effect is achieved by removing DPPH free radicals, inhibiting tyrosinase activity and reducing melanogenesis; according to the composition, through compatibility in a specific proportion, synergistic interaction is achieved, the whitening and anti-saccharification effects are further improved while the anti-aging effect is achieved, and the skin problem is solved from multiple dimensions. The four natural components used for the composition all derive from homology of medicine and food, no organic reagent is contained in the extraction process, and the composition is green, environmentally friendly, safe and reliable.

The invention provides a method for preparing high-purity and fine-particle-size lithium sulfide based on carbon thermal reduction. The method comprises the following steps: weighing lithium sulfate monohydrate, an insoluble inorganic carbon source and cysteine in a set proportion to form a raw material mixture; mixing the raw material mixture with water according to a set solid-to-liquid ratio, performing ultrasonic dispersion to obtain homogeneous dispersion liquid, and enabling the dispersion liquid to pass through a nitrogen circulating spray dryer to obtain uniform and dry precursor powder; in a vacuum environment, carrying out segmented calcination to obtain a crude product lithium sulfide; and in a dry and anhydrous environment, washing the crude product lithium sulfide for multiple times by using absolute ethyl alcohol according to a set liquid-solid ratio to obtain an alcoholic solution containing lithium sulfide, and then obtaining lithium sulfide fine powder through a nitrogen circulating spray dryer. The invention solves the problems of side reaction, low purity, large product particles, uncontrollable particle size and the like of lithium sulfide prepared by a carbon thermal reduction method in the prior art.

The invention provides a concrete admixture with sulfate corrosion resistance and rust resistance functions. The concrete admixture is prepared from the following raw materials in parts by weight: 50-65 parts of fly ash, 8-12 parts of barium carbonate, 8-12 parts of barium hydroxide, 8-12 parts of mineral powder, 5-8 parts of modified hydrotalcite or hydrotalcite, 1-3 parts of nano silicon dioxide and 1-3 parts of calcium nitrite. Nano silicon dioxide is adopted as a compact component, the porosity of the material is reduced, the compactness of concrete is improved, sulfate in the environment is inhibited from being transmitted into the concrete, meanwhile, hydrotalcite is modified by polymaleic acid serving as a scale inhibition component, and the scale inhibition effect is improved through the dual effects of high adsorbability and slow release of the scale inhibition component of hydrotalcite. The preparation method has the advantages that generation of ettringite and gypsum in a sulfate radical environment is inhibited, calcium nitrite is added as a corrosion-inhibiting component, a protective film is formed on the surface of a reinforcing steel bar, the corrosion phenomenon of the reinforcing steel bar in a concrete structure is inhibited, and finally, the concrete admixture with sulfate corrosion resistance and corrosion-inhibiting functions is formed through compounding.

The invention belongs to the field of vanadium metallurgy, and particularly relates to a method for preparing metal vanadium through aluminothermy in cooperation with molten salt electrolysis so as to solve the problem that in the prior art, the production cost of the metal vanadium is high due to the fact that high-temperature and high-vacuum refining is used for removing impurity aluminum. The method comprises the following steps: uniformly mixing a vanadium-containing raw material, metal aluminum and an additive according to a weight ratio of 100: (25-35): (4-8), igniting to carry out aluminothermic reduction reaction, and removing upper smelting slag after a reaction product is cooled to obtain primary metal vanadium; and the primary metal vanadium is subjected to molten salt electrolytic refining in the protective gas atmosphere, and refined metal vanadium is obtained. According to the method, high-temperature or high-vacuum refining is not needed, the high-purity metal vanadium can be prepared only through the two-step operation of aluminothermic reduction and molten salt electrolysis, and compared with an existing vanadium preparation process adopting high-temperature and high-vacuum refining, the energy consumption and the production cost are remarkably reduced.

The invention discloses a high-strength cold-resistant fiber and a preparation method thereof, and relates to the field of fibers. When the high-strength cold-resistant fiber is prepared, diphenylphosphine sequentially reacts with triallylmethoxysilane and nickel bromide, and a silicon-phosphorus-nickel complex is prepared; the preparation method comprises the following steps: reacting an alkene mixed solution, azodiisobutyronitrile, a hydrochloric acid solution and a silicon mixed solution, diluting with 4-methyl cyclohexanone, and reacting with zinc bromide to prepare a pre-modified polyacrylate emulsion; the preparation method comprises the following steps: carrying out a batch reaction on graphene oxide and 1-aminopyrrole to prepare modified graphene oxide; the modified graphene oxide, 2, 5-dihydroxy terephthalaldehyde and the pre-modified polyacrylate emulsion react and then electrostatic spinning is conducted, and the high-strength cold-resistant fiber is prepared. The high-strength cold-resistant fiber prepared by the invention has antibacterial, anti-aging, flame-retardant and antistatic capabilities.

The invention discloses a synthesis method of a non-silicon defoaming agent and application of the non-silicon defoaming agent in the field of scandium extraction in hydrometallurgy. The defoaming agent is synthesized by a component A, a component B and a component C through a two-step reaction, the synthesis method comprises the following specific synthesis steps: 1) carrying out esterification reaction on an amino acid substance A and a fatty alcohol substance B to generate an amino ester substance D; and 2) carrying out substitution reaction on the amino ester substance D and a triazine compound C to obtain the non-silicon defoaming agent. The defoaming agent disclosed by the invention is wide in application range, can be applied to links such as a laterite-nickel ore hydrometallurgy front-end scandium extraction method and an MHP hydrometallurgy scandium impurity removal process, is added as an auxiliary agent in the extraction process, and is used for reducing the surface tension of liquid, preventing the formation and enrichment of a third-phase substance and reducing the occurrence of an emulsification phenomenon; the process stability and the output quality are improved, and the method has important industrial application value.

The invention provides a lithium-mixed coated modified ternary positive electrode material as well as a preparation method and application thereof, and relates to the technical field of lithium battery raw materials. Various lithium sources are mixed according to a certain proportion to prepare a ternary positive electrode, co-doping modification is carried out through cooperation of Li3PO4 and a W / Al / Zr / Y / B-containing compound, double-layer coating modification is carried out through cooperation of the Li3PO4 and a Ti / Al-containing compound for primary coating and cooperation of an anhydrous Li compound and TiP2O7 or Ti3 (PO4) 4 for secondary coating, and a double-gradient fast ion conductor coating layer is constructed. The structural stability, the thermal stability, the first discharge capacity and efficiency, the multiplying power, the circulation and storage performance and the like of the single-crystal or polycrystal ternary positive electrode material under different voltage and power conditions are improved; the lithium-mixed multi-element composite ternary positive electrode provided by the invention has the advantages of more stable layered structure, higher safety, higher electronic conductivity, better multiplying power, high specific capacity and long cycle performance.

The invention relates to the field of cell biology, and particularly discloses an exosome as well as a preparation method and application thereof. The method for preparing the exosome comprises the following steps: (1) introducing nucleotide sequences for coding a signal peptide TPA and an epidermal growth factor into an AAVS1 region of a host cell, such as a sequence shown in SEQ ID No.9 and a sequence shown in SEQ ID No.10, so as to obtain a modified host cell; and (2) collecting the exosome secreted by the modified host cell. The expression level of EGF mRNA in the exosome can be remarkably improved, so that the obtained exosome has a better effect in skin wound treatment.

The invention discloses a preparation method of a zinc-dihydromyricetin nano-enzyme and application of the zinc-dihydromyricetin nano-enzyme in preparation of drugs for promoting healing of diabetic wounds, and the zinc-dihydromyricetin metal polyphenol nano-enzyme (Zn-DHM) is obtained by coordinating a metal element zinc (Zn) and a natural product dihydromyricetin (DHM) through a one-step method by taking PVP as a surfactant. The Zn-DHM nano-enzyme prepared by the invention has antioxidant property and cell proliferation and migration promoting ability, and can maintain metabolism and immune homeostasis of diabetic wounds, so that the Zn-DHM nano-enzyme can accelerate early healing of the diabetic wounds.

The invention discloses a warm-keeping fabric containing hollow polyester fibers as well as a preparation method and application thereof, and relates to the field of fabrics. When the thermal fabric containing the hollow polyester fibers is prepared, hollow mesoporous nano cerium oxide is selectively protected by molten paraffin and then reacts with chloromethyl trimethoxy silane and isocyanuric acid in sequence, paraffin is dissolved by chloroform, and then N-(3-trimethoxysilylpropyl) pyrrole is grafted to obtain modified hollow mesoporous nano cerium oxide; reacting terephthalic acid, a multifunctional monomer and ethylene glycol to obtain modified polyester particles; the preparation method comprises the following steps: granulating modified polyester, uniformly mixing modified hollow mesoporous nano cerium oxide and polyethylene glycol 10000, performing melt spinning, treating with a pyrrole solution, twisting, spinning and weaving, and treating with a sodium hypochlorite mixed solution to obtain the thermal fabric containing the hollow polyester fibers. The warm-keeping fabric containing the hollow polyester fibers prepared by the invention has excellent warm-keeping, antibacterial, anti-aging, flame-retardant, antistatic and mechanical properties.

The invention belongs to the field of engine aftertreatment systems, and provides a composite two-stage SCR system, a control method, an aftertreatment system.The system comprises a first SCR, a first ASC, a DOC, a DPF, a second SCR, a second ASC, a calculation control unit, an electric heating device, a gas concentration detection unit and an exhaust temperature unit; and the control unit is used for determining a urea injection control strategy of the first SCR and the second SCR and a working strategy of the electric heating device according to the nitrogen oxide concentration and the nitrogen dioxide proportion detected by the gas concentration detection unit and the temperature obtained by the exhaust temperature unit, and respectively controlling the first SCR, the second SCR and the electric heating device to work according to the determined strategies. According to the invention, the cooperative control requirement of ultralow nitrogen oxide emission and nitrous oxide gas emission limitation of the diesel engine can be met.

The invention discloses a laser additive manufacturing method for an aluminum / titanium alloy gradient structure, and belongs to the technical field of laser additive manufacturing. The laser additive manufacturing method comprises the steps that TiNbVZr or TiNbV high-entropy alloy powder is used for preparing the high-entropy alloy transition layer on the surface of titanium alloy through the laser additive manufacturing process, and then the aluminum alloy layer is prepared on the surface of the high-entropy alloy transition layer through the laser additive manufacturing process. According to the preparation method, the aluminum / titanium alloy gradient structure with high performance is prepared by combining optimization of the intermediate transition layer of the high-entropy alloy with two preferable components with a laser additive manufacturing technology, and the problems of interface cracking and low bonding strength of the current aluminum / titanium alloy can be effectively solved.

The invention discloses a method for smelting high-proportion sefstromite in an oxygen blast furnace, which comprises the following steps: pure oxygen injection is adopted in the blast furnace, pure oxygen, hot coal gas and pulverized coal are injected from a tuyere, an iron material and coke are added from the top of the furnace, the volume percentage of N2 in the top coal gas is less than 25%, and the top coal gas is recycled after CO2 is removed. By means of the method for smelting the high-proportion sefstromite through the oxygen blast furnace, smelting that the proportion of the sefstromite in the blast furnace is larger than 60%, the mass fraction of TiO2 in the blast furnace slag is larger than 15% and smaller than 45%, and CO2 emission is reduced by 30% or above can be achieved, and the problem that in existing blast furnace smelting, when the proportion of the sefstromite is increased, the cost is low is solved. The problems that slag is thick, slag and iron are difficult to separate, furnace conditions are unsmooth, cost is high, carbon emission is high and the like exist in the prior art, so that the utilization efficiency of vanadium-titanium resources is higher, and smelting cost and carbon emission are lower.

The invention provides an application of N-trans-p-coumaroyl tyramine or a derivative thereof in preparation of a skin whitening product, and relates to the technical field of biology, and the application of the N-trans-p-coumaroyl tyramine or the derivative thereof in preparation of cosmetics for skin whitening or drugs for skin whitening is as follows: (I) the N-trans-p-coumaroyl tyramine or the derivative thereof is applied to preparation of cosmetics for skin whitening or drugs for skin whitening; (2) inhibiting melanogenesis in a non-diagnostic and therapeutic manner; (3) preparing a melanin inhibitor; (IV) inhibiting the tyrosinase activity of the subject in a non-diagnostic and therapeutic manner; or (V) preparing the tyrosinase inhibitor. According to the invention, a natural compound N-trans-p-coumaroyl tyramine which is derived from a traditional Chinese medicine and has a whitening effect is found, and a new functional component with a whitening effect is provided for the skin beautifying industry.

The invention relates to a composite peptide with anti-inflammatory and soothing effects, a composition and application thereof, and belongs to the technical field of polypeptides. The invention relates to a composite peptide with anti-inflammatory and soothing effects. The composite peptide is prepared from the following components: tripeptide-1, acetyl dipeptide-1, palmitoyl tetrapeptide-7 and palmitoyl tripeptide-8, the mass ratio of the tripeptide-1 to the acetyl dipeptide-1 to the palmitoyl tetrapeptide-7 to the palmitoyl tripeptide-8 is (0.5 to 1.5) to (0.6 to 1.5) to (1 to 2) to (0.5 to 1.5). Experiments prove that the composite peptide has good anti-inflammatory, soothing and anti-wrinkle effects.

The invention discloses a low-boron high-coercivity neodymium-iron-boron permanent magnet and a preparation method thereof, and belongs to the technical field of permanent magnets, the preparation method of the permanent magnet comprises the following steps: taking Pr, Fe, Cu and Ga as raw materials, smelting the raw materials through a vacuum melt-spinning furnace to obtain a Pr65Cu25 melt-spinning sheet and a Pr65Fe30Ga5 melt-spinning sheet, grinding the melt-spinning sheet through a three-head grinder to obtain Pr65Cu25 alloy powder and Pr65Fe30Ga5 alloy powder, and sintering the Pr65Cu25 alloy powder and the Pr65Fe30Ga5 alloy powder to obtain the low-boron high-coercivity neodymium-iron-boron permanent magnet. Under the protection of argon or nitrogen, mixing the two to obtain additive phase powder; the low-boron neodymium-iron-boron magnet raw materials are adopted to prepare the main phase alloy powder, and the Pr, Fe, A < l >, Cu and Ga raw materials are adopted to prepare the additive phase powder, the additive phase powder is added into the main phase alloy powder, a lubricating agent is added, and mixing, grinding, compression molding, isostatic pressing treatment, sintering and tempering treatment are conducted to obtain the low-boron neodymium-iron-boron magnet. And the obtained neodymium iron boron permanent magnet has relatively high coercive force and magnetic performance.

The invention relates to the technical field of defoaming agents, and discloses a modified organic silicon defoaming agent and a preparation method thereof.The modified organic silicon defoaming agent takes hydrogen-containing silicone oil as a base material, polyether modified carboxymethyl cellulose and modified white carbon black are used for modifying the base material to obtain the modified organic silicon defoaming agent, and after the white carbon black is modified, the modified organic silicon defoaming agent is prepared. According to the present invention, the polyether modified organic silicon is uniformly and stably distributed in the system so as to improve the defoaming efficiency, the carboxymethyl cellulose has characteristics of excellent thickening property, excellent film forming property and excellent stability, can improve the consistency of the organic silicon defoaming agent, can help to form the stable film layer, can easily adhere and disperse the active component of the defoaming agent, and can improve the defoaming effect; the surface property of the modified organic silicon is improved, the modified organic silicon has better hydrophilicity and wettability, the structural stability of the silicone oil is improved, all the components have a synergistic effect, and the prepared modified organic silicon has excellent defoaming and foam inhibiting effects, meanwhile, the dispersity is good, the heat resistance and stability are improved, and the application range is wide.

The invention relates to the technical field of mulberry processing, in particular to fermented mulberry powder with sleep-aiding and sugar-resisting effects as well as a preparation method and application of the fermented mulberry powder. The preparation method comprises the following steps: adding mulberries into water, and pulping to prepare pulp; adding a compound enzyme into the slurry for enzymolysis to obtain an enzymatic hydrolysate; equally dividing the enzyme solution into two parts, and respectively adding saccharomyces cerevisiae and plant lactobacillus for first-stage fermentation to obtain a first fermentation solution; sterilizing the first fermentation liquor, and adding casei paracasei for second-stage fermentation to obtain second fermentation liquor; and filtering the second fermentation liquor, adding a solid filler into the filtrate, and then sterilizing and drying in sequence to obtain the fermented mulberry powder. Compared with common mulberry powder, the fermented mulberry powder prepared by the preparation method disclosed by the invention has the effects of aiding sleep and resisting sugar, is obvious in aiding sleep, can inhibit generation of AGEs, and has the effect of inhibiting glycosylation.

The invention discloses a method for synergistically hydro-thermally treating sludge based on tea residue and organic acid, which comprises the following steps: mixing sludge with organic acid and tea residue, and performing hydro-thermal treatment and dehydration treatment on the obtained mixed slurry to obtain filtrate and a mud cake. According to the method for carrying out the synergistic hydrothermal treatment on the sludge based on the tea residues and the organic acid, the hydrothermal reaction temperature can be remarkably reduced under the synergistic effect of the tea residues and the organic acid, meanwhile, the sludge is subjected to the synergistic hydrothermal treatment through the organic acid and the tea residues, the dehydration performance of the sludge can be effectively improved, and meanwhile generation of nondegradable organic matter such as melanoidins can be effectively inhibited; therefore, efficient, environment-friendly, recycling and low-cost treatment of the sludge can be realized by fully utilizing the characteristics of the organic acid and the tea residues and cooperating with a hydrothermal treatment technology, and the method has the advantages of low reaction temperature, high treatment efficiency, low energy consumption, good dehydration effect, greenness, environmental protection and the like; wide application prospects and popularization values are realized.

The invention belongs to the technical field of functional foods and health foods, and particularly relates to an anti-saccharification and anti-aging aronia melanocarpa fruit composition and a preparation method thereof. The composition is prepared from the following raw materials in parts by weight: 150 to 400 parts of aronia melanocarpa fruit fermentation liquor, 10 to 80 parts of lycium ruthenicum, 10 to 80 parts of ginseng, 0.5 to 2.5 parts of grape seed extract, 10 to 70 parts of collagen peptide, 0.5 to 4 parts of sodium hyaluronate, 0.1 to 0.8 part of resveratrol and 0.03 to 0.3 part of yeast extract. The content of type I collagen peptide in the skin is increased, the generation of in-vitro anti-glycation end products is inhibited, and the anti-glycation and anti-aging effects are achieved.

The invention relates to the technical field of metal-based composite materials, and discloses a preparation method of a silicon carbide reinforced aluminum-based composite material for electronic packaging, the method that pre-oxidation is conducted on the surfaces of silicon carbide particles first and then vacuum micro-evaporation titanium plating is conducted is adopted, the wettability with an Al matrix is obviously improved, generation of an interface reaction brittle product Al4C3 is inhibited, and the performance of the silicon carbide reinforced aluminum-based composite material is improved. Defects such as gaps in the composite material are reduced, and the mechanical property of the composite material is improved; the silicon carbide reinforced aluminum-based composite material is prepared by adopting a non-pressure infiltration method, so that the production time is obviously shortened, infiltration can be successful by taking a small amount of time, and the process is stable; the interface phase TiC / Ti5Si3-Al coating not only improves the electrical conductivity and thermal conductivity of the silicon carbide powder, but also enhances the adhesive force of the silicon carbide powder and an aluminum base; al2O3 is gradually adsorbed and deposited on the surface of the material by adopting a micro-arc oxidation process, so that the corrosion resistance of the aluminum silicon carbide composite material is enhanced, and the requirements of a contemporary packaging material on high heat dissipation and corrosion resistance can be met.

The invention discloses a method for preparing organic carboxylic ester through olefin hydroesterification, and belongs to the technical field of organic carboxylic ester preparation. According to the technical scheme, terminal olefin, CO and alcohol serve as reactants, organic carboxylic ester with one more carbon is generated under the action of an acid auxiliary with zwitterionic liquid serving as a solvent, a phosphine ligand and a catalyst of a Pd compound, the structure of the zwitterionic liquid simultaneously contains an imidazole group and a sulfonate group, and the structural formula of the zwitterionic liquid is shown in the description. The concentration of the zwitterionic liquid in the reaction system is the solvent amount; the molar ratio of the Pd compound to the ionic liquid is (0.1-1): (1000-10000), the molar ratio of the phosphine ligand to the ionic liquid is (0.1-1): (10-100), and the molar ratio of the acid to the ionic liquid is (0.1-1): (2-50). The method has the advantages of mild reaction conditions, wide raw material application range, high reaction activity, good stability and the like, and is a reaction system with a very good industrial application prospect.

The invention relates to a negative active material and a preparation method thereof, a negative pole piece and a lithium ion battery, and belongs to the technical field of electrochemistry. The negative electrode active material comprises a composite core material and a coating material, the composite core material comprises a substrate material and a first material, the substrate material is provided with a plurality of pores, and the first material is arranged on the pore walls of the pores of the substrate material; the coating material coats at least part of the outer surface of the composite core material; wherein the nucleation overpotential of lithium on the first material is smaller than the nucleation overpotential of lithium on the coating material, so that lithium ions are more prone to nucleation and deposition on the first material, and formation of lithium dendrites is reduced; the coating material further protects the inner core material and prevents the inner core material from being in direct contact with the electrolyte, so that the probability of side reaction between the metal lithium and the electrolyte / electrolyte is reduced, and the cycle performance is improved.

The invention belongs to the technical field of aluminum alloy material surface treatment, and particularly relates to a preparation method of an anodic oxidation coating for a semiconductor processing equipment part. Comprising the following steps that a solid solution layer or a cladding layer is formed on pretreated aluminum alloy through a vacuum laser treatment method, and the cladding layer is an aluminum layer; in the laser treatment process, the laser power ranges from 200 W to 400 W, and the scanning rate ranges from 800 mm / s to 2000 mm / s; and the aluminum alloy sample subjected to laser treatment is placed in an anodic oxidation electrolyte to be treated, an anodic oxidation coating is formed on the surface of the aluminum alloy, hole sealing treatment is conducted on the anodic oxidation coating, and the anodic oxidation coating for the semiconductor processing equipment component is obtained. According to the method, laser is adopted for conducting surface remelting or pure aluminum layer cladding on the aluminum alloy, a second phase cluster on the surface layer of the aluminum alloy sample is reduced or eliminated, the anodic oxidation thickness prepared after the aluminum alloy is subjected to laser pretreatment is uniform, large-size holes do not exist, and the compactness of a subsequent anodic oxidation coating is effectively improved.

The invention provides an aqueous zinc ion electrolyte additive containing maltitol and application thereof, belonging to the technical field of aqueous batteries. The additive is maltitol. In the process of zinc deposition, maltitol molecules can be preferentially attached to the surface of a zinc metal anode through chemical adsorption, reducing the direct contact between free water and the zinc metal surface, thereby reducing the hydrogen evolution reaction between free water and the zinc metal surface, and inhibiting the generation of byproduct sulfate. In addition, a zinc ion battery containing maltitol can generate a larger nucleation overpotential, which can promote the formation of a finer grain zinc deposition layer, and also lead to an increase in nucleation sites and a decrease in nucleation speed, thereby inhibiting the growth of zinc dendrites, which helps the uniform deposition of zinc ions on the surface of the zinc metal anode.

The invention provides a lithium metal negative electrode current collector, a preparation method thereof and a lithium metal battery, and the method comprises the following steps: carrying out single-side treatment on carbon cloth in oxygen plasma for 8-12 seconds to obtain gradient activated carbon cloth; the preparation method comprises the following steps: dissolving Zn (NO3) 2 and urotropine in water, and slowly adding ammonia water to obtain a colorless and transparent precursor solution; and transferring the precursor solution into a polytetrafluoroethylene liner, carrying out hydrothermal reaction on the precursor solution and gradient activated carbon cloth, cooling to room temperature, and washing and drying to obtain the lithium metal negative electrode current collector. The three-dimensional carbon cloth current collector with longitudinal zinc oxide gradient distribution is obtained through single-sided oxygen plasma treatment and a one-step hydrothermal method, and meanwhile, lithium is induced to deposit from bottom to top and uniformly grow in a three-dimensional carbon cloth framework with ZnO lithium-loving sites gradient distribution by effectively controlling the concentration distribution of ZnO, so that the formation of lithium dendrites is inhibited; the cycle stability of the electrode is improved, and long cycle stability and high energy density of the lithium battery are realized.

The invention discloses a composite lithium sulfide positive electrode material as well as a preparation method and application thereof, and belongs to the field of lithium-sulfur batteries. A carbon source and metal salt are subjected to a one-step calcination method, urea reacts with nickel salt and iron salt to generate a nickel nitride and iron nitride compound, glucose and urea generate nitrogen-doped multi-stage porous carbon under the action of a sodium chloride template, and a nickel nitride / iron nitride compound and a nitrogen-doped multi-stage porous carbon composite material are obtained and serve as precursor materials. The preparation method comprises the following steps: mixing lithium sulfide with N-methyl pyrrolidone to prepare lithium sulfide slurry; and immersing the prepared precursor material into the lithium sulfide slurry, and drying to obtain the composite lithium sulfide positive electrode material. Nickel nitride and iron nitride in the material are used as double catalysts and have a synergistic effect to accelerate the redox reaction of lithium sulfide / lithium polysulfide. In addition, the nitrogen-doped multi-stage porous carbon structure can effectively bear lithium sulfide and lithium polysulfide and relieve volume expansion.

The invention discloses a zirconium-nickel dissimilar metal welding method based on active regulation and control of a temperature field. The zirconium-nickel dissimilar metal welding method comprises the following steps that S1, base metal is cleaned; the butt-joint end faces and the welding surfaces of the zirconium and nickel alloy pipes are polished and cleaned, and clean zirconium and nickel base materials are obtained; s2, a to-be-welded part is assembled; the to-be-welded end face of the clean base metal is assembled in a protective gas cavity of the rotary clamping device; s3, welding is conducted; a laser scanner is adopted for welding at a preset welding position, heat source gradient distribution of base metal at the two ends of a welding seam is controlled by regulating and controlling laser power, welding seam temperature field feedback is established through an infrared temperature sensor, and real-time monitoring and laser power regulating and controlling are conducted; s4, postweld heat treatment; and the laser power is adjusted in real time according to welding seam temperature field feedback so as to adjust and control the welding seam cooling process. According to the method, effective connection of zirconium-nickel indissolvable metal is achieved by controlling the regional welding temperature field, the temperature range for forming brittle compounds is avoided, the uniformity of a molten pool between Zr and Ni materials is ensured, and welding defects such as hot cracks and air holes are reduced.