454 results about "Tetrafluoroborate" patented technology

The invention discloses a crystalline polyaryletherketone surface grafted carbon fiber and a preparation method thereof, and belongs to the technical field of carbon materials.The preparation method comprises the following steps that an amino end-capping reagent containing sulfuryl, a difluoro monomer, a bisphenol monomer and potassium carbonate are placed in sulfolane to be subjected to a polymerization reaction, and amino-terminated polyarylether is obtained; carrying out diazonium salt reaction on the amino-terminated polyarylether and nitrite tetrafluoroborate to obtain diazonium salt-terminated polyarylether; connecting the carbon fiber with a cathode, immersing the carbon fiber in an electrolyte containing diazonium salt terminated polyarylether, and applying a reduction potential for reaction to obtain polyarylether grafted carbon fiber; and carrying out hydrolysis reaction on the carbon fiber grafted with polyarylether in an acid environment to obtain the crystalline polyaryletherketone surface grafted carbon fiber. According to the crystalline polyaryletherketone surface grafting modified carbon fiber prepared by the invention, the carbon fiber is directly connected with a polymer through high-temperature-resistant and corrosion-resistant phenyl and sulfuryl, so that the crystalline polyaryletherketone surface grafting modified carbon fiber has better high-temperature resistance and corrosion resistance.

The invention relates to the technical field of polyurethane synthesis, and discloses a polyurethane prepolymer and composition based on supramolecular weaving crosslinking and a preparation method of the polyurethane prepolymer, and a cross-linking agent in the polyurethane prepolymer comprises a compound as shown in a formula I and organic copper salt; the molar ratio of the compound as shown in the formula I to the organic copper salt is 1: (1.8-3); the organic copper salt is selected from copper tetraacetonitrile tetrafluoroborate and / or copper tetraacetonitrile hexafluorophosphate. According to the invention, the dynamic nature of a mechanical interlocking supramolecular structure is utilized, and a polymer with a topological structure is woven through an ectopic ring-opening polymerization strategy. The woven polymer can be used as a cross-linking agent of a polyurethane composition, can endow the polyurethane composition with relatively high mechanical property and good tensile property at the same time, and greatly improves the tensile toughness of polyurethane. # imgabs0 #

The invention belongs to the technical field of electrochemical energy storage, and particularly relates to a low-temperature aqueous electrolyte for anchoring I < + > ions based on a double-coordination structure and a low-temperature four-electron aqueous zinc-iodine battery. The low-temperature aqueous electrolyte is a mixed solution of a zinc salt, an electrolyte additive and water, and the low-temperature aqueous electrolyte comprises 2-5 mol / L of the zinc salt and 0.3-0.6 mol / L of the electrolyte additive; the zinc salt is zinc perchlorate or zinc tetrafluoroborate. The low-temperature four-electron aqueous zinc-iodine battery comprises the low-temperature aqueous electrolyte. Compared with the prior art, the invention at least has the following beneficial effects: (1) the corrosion risk caused by chloride ion concentration is reduced; (2) efficient four-electron iodine positive electrode reaction is realized; and (3) obtaining the low-temperature four-electron aqueous zinc-iodine battery.

The invention discloses electrolyte for a long-service-life sodium-ion battery as well as a preparation method and application of the electrolyte, and relates to the technical field of sodium-ion battery electrolyte. According to the invention, the piperidinyl and phosphorous acid tetrafluoroborate ionic liquid is added, so that the performance of the sodium ion electrolyte is remarkably improved. Firstly, the additives improve the thermal stability and chemical stability of the electrolyte, which are particularly important in the long-term operation process of the battery, and can effectively prevent the electrolyte from being decomposed under high-temperature or extreme operating conditions. And secondly, because the ionic liquid has excellent electrochemical stability, the electrochemical window of the electrolyte is enhanced due to the existence of the ionic liquid, that is, the electrolyte can bear a wider voltage range without electrochemical reaction. This is very advantageous for improving the energy density and power output of the battery. And finally, the introduction of the ionic liquid can also increase the ionic conductivity of the electrolyte and reduce the internal impedance of the battery, so that the charge-discharge efficiency and the cycle life of the battery are improved.

The invention relates to viologen-anthraquinone composite electrochromic liquid and a preparation method thereof, the viologen-anthraquinone composite electrochromic liquid comprises 1.2-2.5 parts by mole of viologen salt, 0.8-1.5 parts by mole of anthraquinone derivative and 8-12 parts by mole of electrolyte; the viologen salt is ethyl viologen tetrafluoroborate or heptyl viologen tetrafluoroborate or octyl viologen tetrafluoroborate; the anthraquinone derivative is 1-ethylamino-4-hydroxy anthraquinone or acid blue 43; the preparation method comprises the following steps: preparing an electrolyte solution; adding purple refined salt and anthraquinone derivatives according to the formula; fully dissolving the electrochromic material to form uniform and transparent initial liquid; and degassing the initial liquid to remove oxygen dissolved in the initial liquid. The electrochromic liquid has the advantages that after the purple refined salt and the anthraquinone derivative are added into the dissolving solution according to the proportion of the formula, the two color-changing materials are jointly dissolved in the electrolyte, and when the two color-changing materials are reduced at the same time, spectrum superposition absorbed by the two color-changing materials can cover the whole visible region, so that black and white switching of the electrochromic liquid is realized, and the use effect is good.

The invention relates to a self-repairing ionic gel electrolyte, a zinc ion battery and a preparation method and application of the self-repairing ionic gel electrolyte and the zinc ion battery. The ionic gel electrolyte comprises a polymer network, ionic liquid (1-ethyl-3-methylimidazolium tetrafluoroborate) and movable zinc ions, the polymer network is obtained through a reaction of an anionic monomer 2-acrylamido-2-methyl sodium propanesulfonate and a cationic monomer acryloyloxyethyl trimethyl ammonium chloride, and the movable zinc ions are provided by a zinc tetrafluoroborate hydrate. The zinc ion battery takes the ionic gel as an electrolyte, and a positive film electrode and a negative film electrode are arranged on two sides of the ionic gel. Compared with the prior art, the material not only has excellent mechanical properties and efficient ion transmission capability, but also has the capability of quickly repairing mechanical damage, and the completely broken material can be completely repaired after being contacted for 10 seconds under infrared light irradiation. The prepared zinc ion battery has excellent self-repairing performance, flexible performance and electrochemical performance.

The invention discloses an ionic liquid-based electrolyte, a wide-temperature-range high-voltage supercapacitor and application of the wide-temperature-range high-voltage supercapacitor. The wide-temperature-range high-voltage supercapacitor comprises a eutectic ionic liquid system and an organic solvent, the eutectic ionic liquid system comprises at least two ionic liquids; the ionic liquid comprises cations and anions; the positive ions are selected from at least one of pyrrolidinyl positive ions, piperidinyl positive ions, imidazolyl positive ions and quaternary ammonium positive ions containing different side chains; the anion is selected from at least one of tetrafluoroborate, hexafluorophosphate, bis (trifluoromethylsulfonyl imine), bis (fluorosulfonyl imine) and tetracyanoborate; the organic solvent comprises at least one of fluorinated carbonic ester, fluorinated carboxylic ester, sulfones, ethers and nitriles. The supercapacitor based on the ionic liquid-based electrolyte can stably operate in a wide temperature range, so that the wide-temperature-range high-voltage supercapacitor can be suitable for an extreme working environment, and high energy density and power density are achieved.

The invention relates to the technical field of anti-radiation materials, and particularly discloses an anti-radiation non-woven fabric fiber for shielding and filtering radiation substances and a preparation method of the anti-radiation non-woven fabric fiber. The invention relates to an anti-radiation non-woven fabric fiber for shielding and filtering radiation substances. The anti-radiation non-woven fabric fiber is prepared from the following raw materials in parts by weight: 10 parts of polymer; 4-5 parts of modified rare earth salt; a preparation method of the modified rare earth salt comprises the following steps: adding unsaturated carboxylic acid and rare earth hydroxide into water, carrying out heating reaction and rotary evaporation, then adding 1-ethyl acetate group-3-methylimidazolium tetrafluoroborate, mixing, carrying out suction filtration to remove filtrate, and drying to obtain the modified rare earth salt. The weight ratio of the unsaturated carboxylic acid to the rare earth hydroxide is (1.3-1.5): 1. The anti-radiation non-woven fabric fiber for shielding and filtering radiation substances can be used for preparing anti-radiation materials, and has the advantages that the lead equivalent reaches 0.19 mmPb or above, and the anti-radiation effect is good.

The invention belongs to the technical field of thermoelectric materials and functional polymer materials, and particularly relates to thermoelectric hydrogel based on synergistic enhancement of zwitterions and a polar solvent as well as a method and application of the thermoelectric hydrogel. The thermoelectric hydrogel is obtained through the steps that a precursor solution is subjected to a polymerization reaction to form a gel matrix, then the gel matrix is soaked in a soaking solution, potassium ferricyanide / potassium ferrocyanide redox couple is introduced, and the thermoelectric hydrogel is obtained, and the precursor solution is prepared from acrylamide, N-isopropylacrylamide, dimethyl sulfoxide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide and N, N-dimethylformamide. The photoinitiator is prepared by mixing N, N-dimethylformamide, 1-ethyl-3-methylimidazolium tetrafluoroborate, a zwitterionic monomer [2-(methylacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide, a cross-linking agent N, N '-methylene bisacrylamide, a photoinitiator and deionized water. The thermoelectric hydrogel prepared by the invention has high mechanical strength, high ductility and high Seebeck coefficient, and has better temperature resistance.

The invention discloses a synthesis and purification method of electronic grade phosphorane, which relates to the technical field of phosphorane synthesis, and has the advantages that impurities such as metal oxides and carbides in a silicon carbide ceramic substrate are removed by selecting the silicon carbide ceramic substrate and performing high-temperature annealing treatment, so that the atomic arrangement of the substrate is more regular and ordered; compared with the prior art, the method has the advantages that the gallium phosphide crystal structure is more complete, so that the gallium phosphide crystal structure has higher structural stability, meanwhile, after impurities are removed, the interaction between the substrate and reactants in a high-temperature reaction environment is more controllable, the chemical stability is enhanced, a firm and reliable base is provided for growth of gallium phosphide crystals, and by adopting the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate, the yield of the gallium phosphide crystal is increased. The production of waste gas is reduced by utilizing the extremely low volatility of the gallium phosphide, and meanwhile, the reaction rate between hydrogen phosphide and hydrogen is accelerated by introducing glucose oxidase for catalytic reaction, so that the gallium phosphide crystal is promoted to efficiently and directionally grow on the silicon carbide ceramic substrate, and the product quality and the production efficiency are improved.

The invention relates to a PEM ternary alloy catalyst for water electrolysis hydrogen production and a preparation method thereof, and belongs to the technical field of water electrolysis catalysts. 1-butyl-3-methylimidazolium tetrafluoroborate is introduced in the generation of a carrier manganese dioxide to increase the specific surface area of the carrier, fluorine doping and oxygen vacancy construction are realized on the surface of the carrier through hydrofluoric acid treatment, and then a metal precursor is dispersed through an ethylene glycol / water system; and finally, loading and alloying of the alloy nanoparticles are completed through hydrothermal reduction and heat treatment. The morphology and electronic structure of the carrier are synergistically regulated and controlled through ionic liquid and fluorine doping, the specific surface area and active sites are remarkably increased, strong interaction of metal and the carrier is achieved through ternary alloy component optimization, and the oxygen evolution reaction activity and stability of the catalyst and the precious metal utilization rate are effectively improved.

The invention belongs to the technical field of chemical production, and discloses an ionic liquid dissolving agent mixture as well as a preparation method and application thereof. The ionic liquid dissolving agent mixture is prepared from the following raw materials: modified long-carbon-chain imidazole tetrafluoroborate, modified long-carbon-chain imidazole long-carbon-chain anion salt, betaine salt, imidazole acetate, imidazole haloid, imidazole bis (fluorosulfonyl) imide salt, imidazole hexafluorophosphate, imidazole long-carbon-chain anion salt and quaternary ammonium long-carbon-chain anion salt. And pyridine halogen salts. When the ionic liquid dissolving agent mixture is used for dissolving PE powder and PP powder, a dichloromethane extracting agent can be replaced with water, cyclic utilization of the ionic liquid can be achieved, an original high-investment tail gas treatment device is eliminated, cost reduction and efficiency improvement are achieved for the industry, and meanwhile the performance of PE and PP diaphragms can be improved.

The invention discloses a perovskite composition as well as a preparation method and application thereof. The perovskite composition is prepared from the following raw materials: (FA < 0.95 > MA < 0.05 >) < 0.95 > Cs < 0.05 > Pb < (I < 0.95 > Br < 0.05 >) < 3 > and an additive, the additive is prepared from at least one of 1-octyl-3-methylimidazolium tetrafluoroborate, 1-butyl-1-methylpiperidine tetrafluoroborate and 1-butyl-4-methylpyridine tetrafluoroborate, and the additive is prepared from at least one of 1-octyl-3-methylimidazolium tetrafluoroborate, 1-butyl-1-methylpiperidine tetrafluoroborate and 1-butyl-4- The perovskite composition provided by the invention can effectively improve the light absorption performance, the carrier transport performance and the interface contact quality of a perovskite thin film, so that the photoelectric conversion efficiency of a perovskite solar cell is improved.

The invention discloses a method for preparing a fluorobenzene derivative from diazonium salt of substituted aniline, which comprises the following steps: carrying out ion exchange reaction on diazonium fluoroborate of substituted aniline at low temperature in the presence of a solvent and anhydrous hydrogen fluoride, and then heating and decomposing to obtain the fluorobenzene derivative. The method avoids the generation of water and boron trifluoride in the existing fluorobenzene derivative preparation process, and is beneficial to industrial application.

The invention belongs to the technical field of preparation of compounds, and discloses high-purity 2-imidazolidinone and a preparation method thereof. The preparation method of the high-purity 2-imidazolidinone comprises the following steps: reacting ethylenediamine, dimethyl carbonate and an ionic liquid catalyst to obtain primary 2-imidazolidinone; mixing the obtained primary 2-imidazolidinone with dimethyl carbonate, and filtering to obtain high-purity 2-imidazolidinone; the ionic liquid catalyst is chloridized 1-butyl-3-methylimidazole, brominated 1-butyl-3-methylimidazole, chloridized 1-ethyl-3-methylimidazole, brominated 1-ethyl-3-methylimidazole, 1-butyl-3-methylimidazole tetrafluoroborate or 1-ethyl-3-methylimidazole tetrafluoroborate, and the ionic liquid catalyst is an ionic liquid catalyst which is chloridized 1-butyl-3-methylimidazole, brominated 1-ethyl-3-methylimidazole, brominated 1-ethyl-3-methylimidazole tetrafluoroborate or 1-ethyl-3-methylimidazole tetrafluoroborate. According to the preparation method of the high-purity 2-imidazolidinone, a small amount of high-boiling-point byproducts such as MI and NMI and a dimethyl carbonate solution are further treated, and the target product MI with high purity is obtained.

The invention discloses a preparation method of liquid lithium tetrafluoroborate, which comprises the following steps: fluorating anhydrous lithium chloride by anhydrous hydrogen fluoride in an organic solvent to obtain lithium fluoride, then introducing boron trifluoride gas or adding a boron trifluoride complex, and reacting to obtain a lithium tetrafluoroborate liquid; the preparation process is simple and efficient, the adopted raw materials are very easy to obtain, meanwhile, the fluorination reaction and the lithium tetrafluoroborate synthesis reaction are sequentially carried out in an organic solvent environment, the whole reaction process is safe, stable and reliable, and the preparation method is very suitable for large-scale batch popularization and application; and the lithium tetrafluoroborate liquid with a low acid value can be directly obtained and can be directly applied as an electrolyte additive.

The invention discloses a preparation method of a polyurethane type UV (ultraviolet) visbreaking protective film, which comprises the following steps: (1) mixing hydroxyl-terminated polybutadiene, ethyl acetate, 2-chloro-4, 6-diphenyl-1, 3, 5-triazine, ethidene diamine, dibutyltin dilaurate and hydroquinone in a reaction kettle in a nitrogen protection atmosphere, heating, adding isophorone diisocyanate, stirring at a constant temperature, adding a catalyst, stirring at a constant temperature, and reacting for 2-4 hours; adding 1, 4-butanediol to obtain an adhesive; (2) uniformly mixing hydroxyethyl acrylate, methyl tetrahydrophthalic anhydride and maleic anhydride, heating, adding triethylamine, stirring at a constant temperature, and adding epoxidized soybean oil to obtain a modified acrylate monomer; and (3) stirring the adhesive, then adding the modified acrylate monomer, 1-ethyl-3-methylimidazolium tetrafluoroborate, sodium octane sulfonate and the photoinitiator into the adhesive in a stirring state, stirring to obtain a UV viscosity-reducing adhesive, and coating to obtain the UV viscosity-reducing protective film. The UV viscosity-reducing glue prepared by the method provided by the invention has a good viscosity-reducing effect, is easy to peel after viscosity reduction, and is convenient to operate.

The invention relates to the field of hydrometallurgy, and particularly discloses a technological method for extracting antimony from antimony sulfide through a wet method. A process method for wet extraction of antimony from antimony sulfide comprises the following steps: S1, mixing an antimony sulfide-containing material with a tetrafluoroborate ionic liquid, and adding water for slurrying to obtain ore pulp; s2, the ore pulp is added into a leaching tank with a two-way reaction structure, and leaching treatment is conducted under the nitrogen protection atmosphere; the lower part in the leaching tank is an ore pulp phase; during leaching, sodium sulfide, sodium hydroxide, modified chitosan microspheres and a catalyst are added into an ore pulp phase; s3, the organic phase obtained after leaching treatment is completed is eluted and filtered, and an antimony-containing solution is obtained; and S4, the antimony-containing solution is fed into an electrolytic bath to be subjected to electrodeposition treatment, and antimony is collected. By means of the method, the antimony leaching efficiency can be improved, and then the antimony recovery rate can be improved.

The invention discloses a battery type pressure sensor as well as a preparation method and application thereof. The battery type pressure sensor comprises a positive electrode, a negative electrode and an elastic ionic gel electrolyte connected between the positive electrode and the negative electrode, the elastic ionic gel electrolyte is prepared from the following raw material components: 1-vinyl-3-butylimidazolium tetrafluoroborate, 1-ethyl-3-methylimidazolium tetrafluoroborate, zinc tetrafluoroborate ionic gel, a cross-linking agent and an initiator; the elastic ionic gel electrolyte is provided with a first surface facing the positive electrode and a second surface facing the negative electrode, the first surface is provided with a first protruding structure connected with the positive electrode, and / or the second surface is provided with a second protruding structure connected with the negative electrode. The battery type pressure sensor can solve the technical problem that a traditional pressure sensing mechanism (piezoresistive type, capacitive type, piezoelectric type, triboelectric type and the like) cannot be compatible with long-time self-energy supply and output of a steady-state response signal in a static mode.

The invention discloses a composite lubricant containing a porous covalent organic framework as well as a preparation method and application of the composite lubricant. The composite lubricant comprises a porous covalent organic framework material and an ionic liquid, the ionic liquid is 1-butyl-3-methylimidazolium thiocyanate, 1-ethyl-3-methylimidazolium tetrafluoroborate or 1-butyl-3-methylimidazolium hexafluorophosphate, and the porous covalent organic framework material is a porous covalent organic framework material. According to the invention, a porous covalent organic framework (COF) is added into ionic liquid (ILs) as an additive, the ionic liquid provides an ideal ionic microenvironment or is used as an active substance to endow the organic framework with extra functions such as conductivity, fluidity and dispersibility, and the COF can also improve the corrosivity of the ionic liquid.

This invention provides a method for preparing MXene-derived single-atom catalyst materials using ionic liquid-assisted synthesis. The method includes the following steps: (1) Synthesizing NBF-Ni-LDH / Mo2CT x The mixture consists of Ni(NO3)2·6H2O, urea, C6H8O7·H2O, 1-ethyl-3-methylimidazolium tetrafluoroborate, and Mo2CT. x Add to deionized water, mix well, heat, wash, and dry to obtain NBF-Ni-LDH / Mo2CT x (2) Synthesis of NBF-NiSe2 / Mo2CT x : NBF-Ni-LDH / Mo2CT x Sintering was performed in an Ar / H2 atmosphere to obtain the product NBF-NiSe2 / Mo2CT. x (3) Synthesis of Pt / NBF-NiSe2 / Mo2CT x : PtCl4 and NBF-NiSe2 / Mo2CT x The sample was placed in ethanol, stirred, dried, sintered, washed, and dried to obtain the single-atom catalyst material Pt / NBF-NiSe2 / Mo2CT. x The method of this invention is simple and controllable, and can effectively alleviate the "shuttle effect" of polysulfides in lithium-sulfur batteries, catalyze the conversion of polysulfides, promote the redox reaction kinetics of lithium-sulfur batteries during charge and discharge, thereby improving the discharge capacity of the battery and improving cycle stability.

The invention discloses a preparation method of a self-heating PCM anti-icing / deicing super-hydrophobic coating, and belongs to the field of preparation of anti-icing coatings. The invention aims to solve the problems of high energy consumption, poor mechanical property and easy pollution of the traditional anti-icing material. The method comprises the following steps: 1, preparing a 1-ethyl-3-methylimidazolium tetrafluoroborate grafted nano cellulose copolymer; 2, preparing a self-heating PCM anti-icing / deicing super-hydrophobic coating solution; and 3, coating. The self-heating super-hydrophobic coating based on paraffin and palmitic acid eutectic carbon nanotubes is prepared by adopting an easy-to-spray method, has self-heating and super-hydrophobic dual performance, can store heat when sunlight is sufficient and release heat at low temperature, has good self-cleaning performance and mechanical performance, and can be used for preparing the self-heating super-hydrophobic coating based on paraffin and palmitic acid eutectic carbon nanotubes. The device is suitable for anti-icing and deicing in cold regions. According to the invention, a method of self-heating PCM anti-icing / deicing super-hydrophobic coating is adopted, and the icing time is prolonged through self-heating, photo-thermal and super-hydrophobic functions.

The present invention discloses an electrochemiluminescent compound, a preparation method thereof and an application thereof, wherein the structural formula of the electrochemiluminescent compound is: wherein n is 100-200, R1, R2, R3 and R4 are all selected from one of a Y group and a hydrogen group, and at least one of R1, R2, R3 and R4 is a Y group. The preparation method of the electrochemiluminescent compound comprises the following steps: dissolving an iridium-containing complex, N, N-diisopropylethylamine, N, N, N', N'-tetramethyl-O-(N-succinimide) urea tetrafluoroborate in N, N-dimethylformamide and mixing; adding a polyethyleneimine solution, performing an amide reaction, separating, and obtaining the electrochemiluminescent compound. The electrochemiluminescent compound (Ir-PEI) of the present invention can improve the water solubility of the iridium-containing complex, can also be used as a coreactant unit in the molecule to promote the generation of ECL signals, and can be used as an ECL active material to construct and prepare an iridium ECL reagent.

The invention discloses a pretreatment method for a negative pole piece of an aqueous zinc ion secondary battery, which comprises the following steps: preparing a treatment solution composed of deionized water, an alcohol organic matter and zinc tetrafluoroborate, immersing a zinc foil into the treatment solution, standing for 1-3 days, taking out, washing and drying to obtain the surface-modified zinc negative pole piece. The invention provides a pretreatment process for applying the functionalized electrolyte to the zinc negative electrode for the first time, so that active and controllable modification of a zinc negative electrode interface is realized, and the uncontrollability of a self-formed interface traditionally depending on a first cycle is avoided. A uniform and compact interface layer is formed on the surface of the zinc negative electrode pretreated through the method, zinc dendrite growth and side reactions such as hydrogen evolution and corrosion are effectively inhibited, the coulombic efficiency is remarkably improved, and the cycle life is remarkably prolonged. The method has the advantages of simple process, cheap raw materials, no need of complex equipment, easiness in integration with an existing battery production line, compatibility of treating fluid components with a conventional aqueous electrolyte, no influence on subsequent normal operation of a battery, and good industrial application prospect.

The present application relates to a kind of preparation methods of large aperture ultraviolet third harmonic generator, the method is first using Maker stripe method to measure the frequency doubling coefficient of guanidinium tetrafluoroborate crystal, obtain 2 non-zero effective frequency doubling coefficient;Again, the minimum deflection angle method is used to determine the principal refractive index of guanidinium tetrafluoroborate crystal from 253nm-2325nm between 11 wavelengths, fitting Sellmeier equation;According to Sellmeier equation, the computer program is calculated, and the phase matching curve of the guanidinium tetrafluoroborate crystal type I or type I is calculated, then the phase matching point of the guanidinium tetrafluoroborate crystal is determined by combining frequency doubling coefficient;Then, according to the phase matching direction, guanidinium tetrafluoroborate crystal is cut, and two light transmitting surfaces are polished and coated with dielectric film to obtain the guanidinium tetrafluoroborate crystal third harmonic generator;The large aperture ultraviolet third harmonic generator of the guanidinium tetrafluoroborate crystal is used to generate high-power third harmonic laser output, and has good practical application value in the field of laser technology, especially in high-power laser device.

The invention discloses a high-energy-density graphene composite supercapacitor which comprises a fixed plate, a protective shell is fixedly installed at the top of the fixed plate, a positive plate and a negative plate are arranged on the inner wall of the protective shell, a diaphragm is arranged between the positive plate and the negative plate, and honeycomb holes are formed in the outer surfaces of the positive plate and the negative plate. According to the high-energy-density graphene composite supercapacitor, the ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate is selected as the electrolyte, and a proper amount of lithium salt LiBF4 is added, so that the high-energy-density graphene composite supercapacitor has high ionic conductivity and a wide electrochemical window, the energy density and the charge-discharge performance of the supercapacitor can be improved, and meanwhile, the safety is enhanced; and the diaphragm adopts the polypropylene microporous membrane as the diaphragm, and the polypropylene microporous membrane has good chemical stability and mechanical performance, so that the short circuit of the positive electrode and the negative electrode can be effectively prevented, the smooth passing of ions is ensured, and the stable operation of the supercapacitor is ensured.

The invention discloses a lithium ion battery and electronic equipment, the lithium ion battery comprises a positive pole piece and an electrolyte, the positive pole piece comprises a positive active material, the positive active material comprises Lix [NiyCozMntM (1-y-z-t)] O2-delta, M is at least one selected from Cr, Zr, Ca, Mg, Cu, Ti, Al, Mo, W and Zn, 0.9 lt; xlt; 1.1, 0.8 < = y < lt >; 1.0, 0 < = zlt; 0.1, 0 < = tlt; 0 < = delta < = 0.1; the electrolyte comprises an additive, the additive comprises an ionic liquid, the chemical formula of the ionic liquid is # imgabs0 #, R1 and R2 are alkyl with the carbon atom number of 1-6, and X is selected from any one of bis (fluorosulfonyl) imide, bis (trifluoromethyl) sulfonyl imide, tetrafluoroborate and acetate. The imidazolyl ionic liquid and the high-nickel positive electrode system are matched for use, so that the high-temperature cycle performance of the battery cell can be effectively improved.

This application relates to a copper-aluminum brazed terminal block and its manufacturing method, belonging to the field of power fittings technology. It consists of an aluminum-based terminal block with a copper sheet welded to it. The flux used in the welding is a high-performance, non-corrosive copper-aluminum flux composed of the following components: potassium fluoroaluminate, cesium ammonium fluoride, 1-butyl-3-methylimidazolium tetrafluoroborate, potassium fluorotitanate, and nano-copper oxide. The process involves chemically stripping the dense alumina film using highly active fluorine species released from a pure fluorinated ionic liquid, achieving film removal and avoiding the thermal effects of high temperatures. Secondly, a nano-titanium transition layer is generated in situ through a liquid-phase displacement reaction of potassium fluorotitanate on the nascent aluminum surface, achieving a qualitative change in joint strength from mechanical interlocking to intrinsic metallurgical bonding. Finally, the elimination of chlorine and the presence of a self-cleaning mechanism prevent the flux from absorbing moisture and hydrolyzing or causing electrochemical corrosion, thus ensuring long-term reliability and durability of the joint under harsh environments while achieving good connection performance.

The invention discloses a catalyst for synthesizing 1, 3-dioxane-2-ketone as well as a preparation method and application of the catalyst. The catalyst is prepared from the following components in percentage by mass: 60wt%-90wt% of a component A, 5wt%-20wt% of a component B and 5wt%-30wt% of a component C, wherein the component A is one or more of N, N-dimethyl formamide, N, N-dimethylacetamide, N, N-diethyl formamide and urea, and the component B is one or more of N, N-dimethyl formamide, N, N-dimethylacetamide, N, N-diethyl formamide and urea; the component B is one or more of lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate, calcium carbonate and magnesium carbonate; and the component C is 1-butyl-3-methylimidazolium tetrafluoroborate and / or 1-butyl-3-methylimidazolium hexafluorophosphate, and the component C is 1-butyl-3-methylimidazolium hexafluorophosphate. According to the present invention, the components of the catalyst have the mutual synergistic promotion effect, the reaction substrate can be adsorbed and activated, the reaction condition is mild, the product yield is high, the catalyst can be recovered and regenerated, and the environmental pollution is low.

This invention relates to a tetrafluoroborate imidazole-based metal ionic liquid, its preparation method, and its application in coating aluminum powder. The invention pertains to the preparation method of a tetrafluoroborate imidazole-based metal ionic liquid and its use in combination with aluminum powder to form a core-shell fuel (aluminum powder@metal ionic liquid). The aluminum powder@metal ionic liquid core-shell fuel uses aluminum as the core and a tetrafluoroborate imidazole-based metal ionic liquid as the shell material, prepared via solvent evaporation. This series of core-shell fuels exhibits excellent thermal properties and is primarily suitable for solid propellant fuel applications. Furthermore, the preparation method provided by this invention is simple, operates under mild conditions, and uses readily available raw materials.