245 results about "Dimethoxyethane" patented technology

The invention provides a gel-state polymer electrolyte as well as a preparation method and application thereof, and belongs to the field of batteries. The gel-state polymer electrolyte provided by the invention comprises the following preparation raw materials: a polar organic solvent, a lithium salt, a lithium salt additive, a liquid flame retardant, a liquid monomer and an initiator, the polar organic solvent comprises 1, 3-dioxolame and ethylene glycol dimethyl ether; the dosage ratio of the lithium salt to the polar organic solvent is 1 mmol: (0.5-2) mL; the mass of the lithium salt additive is 1.5-5% of the total mass of the lithium salt and the polar organic solvent; the volume of the liquid flame retardant is 10-20% of the volume of the polar organic solvent; the volume of the liquid monomer is 10-20% of the volume of the polar organic solvent; the mass of the initiator is 0.5-2% of the total mass of the lithium salt, the polar organic solvent and the monomer. And Li < + > in the lithium salt is released after the type of the solvent is adjusted, so that the Li < + > transference number and the ionic conductivity are improved.

The invention provides a preparation method of a covalent organic framework material and application of the covalent organic framework material in a tin-air battery, and the preparation method comprises the following steps: dispersing 2, 2 '-bis (trifluoromethyl) diaminobiphenyl in a mixed solution of 1, 3-dioxolane and ethylene glycol dimethyl ether to obtain a solution I; 2, 4, 6-triformyl phloroglucinol is dispersed in a tetraethylene glycol dimethyl ether solution, and a solution II is obtained; dripping the solution I on a polished tin sheet; after the solution is volatilized, dripping the solution II at the same position; reacting at room temperature for 12 hours, washing with a tetrahydrofuran solution for one time, and washing with a mixed solution of 1, 3-dioxolane and ethylene glycol dimethyl ether for 1-3 times; and then carrying out vacuum drying at room temperature for 8-12h, and finally preparing the covalent organic framework material on the tin sheet. According to the invention, an in-situ preparation method is adopted, the covalent organic framework film and the tin anode are compounded together, and the tin anode is separated from the electrolyte by the film, so that the corrosion of the electrolyte to the anode in room-temperature and high-temperature environments can be reduced, and the formation of by-products and dead tin on the surface of the anode is reduced to improve the battery performance.

The invention relates to the field of battery materials, in particular to a halogen-free electrolyte for a magnesium metal battery and a preparation method of the halogen-free electrolyte. The magnesium salt comprises at least one of bis (trifluoromethanesulfonyl) imide magnesium and magnesium trifluoromethanesulfonate; the additive is prepared from at least one of indole, 3-azaindole, 4-azaindole, 5-azaindole, 6-azaindole, 4-amino indole, 5-amino indole, 6-amino indole and 7-amino indole; the organic solvent comprises ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1, 3-dioxolame or 1, 3-dioxane. The preparation method comprises the following steps: sequentially adding the magnesium salt and the additive into the organic solvent, and stirring and reacting at room temperature for 1 min to 24 h to obtain the halogen-free electrolyte for the magnesium metal battery. And the prepared electrolyte has excellent performances of small overpotential, long service life and wide electrochemical window, and has a good commercial application prospect.

The invention belongs to the technical field of organic synthesis of ethers, and particularly relates to a method for continuously synthesizing ethylene glycol dimethyl ether. The method comprises the following steps that ethylene glycol, sodium hydroxide and methane chloride serve as raw materials, multi-stage continuous reaction is carried out in liquid membrane reactors to synthesize ethylene glycol dimethyl ether, ethylene glycol, sodium hydroxide and methane chloride are introduced into the first-stage liquid membrane reactor, sodium hydroxide and methane chloride are introduced into the subsequent stages of liquid membrane reactors, and the first-stage liquid membrane reactor and the second-stage liquid membrane reactor are connected with the second-stage liquid membrane reactor. A byproduct sodium chloride is separated from a reaction product in the previous-stage liquid membrane reactor and then enters the next-stage liquid membrane reactor, a byproduct sodium chloride is separated from a reaction product in the last-stage liquid membrane reactor and then clear liquid is obtained, and ethylene glycol dimethyl ether is obtained through rectification treatment. The invention develops a novel process mode for continuously synthesizing an ethylene glycol dimethyl ether product, and provides a new idea for large-scale continuous production of ethylene glycol dimethyl ether.

Described herein are lithium-metal rechargeable electrochemical cells comprising a lithium-metal negative electrode, a positive electrode, and a liquid electrolyte. The liquid electrolyte comprises a core mixture and a diluent. The diluent comprises a fluorinated ether. The core mixture comprises a set of salts and a set of solvents. The set of solvents comprises a pyrrolidinium-containing ionic liquid and a molecular solvent. The molecular solvent is a non-fluorinated ether, for example including but not limited to 1,2-dimethoxyethane. In some examples, the electrolyte further comprises an electrolyte additive, for example including but not limited to tris(trimethylsilyl)phosphate. In some examples, the set of salts comprises one or more imide-containing lithium salts. In some examples, the set of salts comprises lithium bis(fluorosulfonyl)imide and an additional salt and the mole fraction of lithium bis(fluorosulfonyl)imide in the set of salts is 0.5 or greater.

The invention belongs to the technical field of synthesis of ether organic compounds, and particularly relates to a one-pot catalyst-free method for preparing ethylene glycol dimethyl ether from ethylene glycol, which comprises the following steps: (1) adding ethylene glycol into a reaction kettle, heating to 120-140 DEG C, introducing methane chloride, and controlling the introduction amount of methane chloride to be 20-50% of the total molar amount of ethylene glycol; (2) adding NaOH into the reaction kettle in batches, and stirring for reaction at the reaction temperature of 120-140 DEG C; (3) after the last batch of NaOH is added, sampling and detecting every 20-25 minutes, and measuring the concentration lt of NaOH in the reaction liquid; and when the concentration is 0.05 mol / L, finishing the reaction, filtering, and carrying out post-treatment rectification on the filtrate to obtain the ethylene glycol dimethyl ether. The preparation raw material ethylene glycol can be derived from biomass or coal, dependence on petroleum resources is reduced, and meanwhile the preparation method has the advantages of being few in side reaction and low in production cost.

The invention belongs to the technical field of polycarbosilane, and particularly relates to a synthesis method of polydimethylsilane and application of the polydimethylsilane in preparation of polycarbosilane. In the Wurtz polymerization reaction of polydimethylsilane, polar solvents such as crown ether, diethylene glycol dimethyl ether, hexamethylphosphoric triamide and polyether are added into a reaction system, and the polar solvents have a complexing effect on sodium ions, so that tight ion pairs can be promoted to become loose ion pairs, the concentration of active anions is greatly increased, and the reaction time is shortened; therefore, the initiation period of the reaction is shortened, the polymerization reaction speed is accelerated, the molecular weight of polydimethylsilane is improved, and the yield is improved; the molecular weight of the polydimethylsilane is increased, the pyrolysis activation energy of the polydimethylsilane is gradually reduced, and the prepared polycarbosilane has higher Si-H bonds, and is high in A-grade conversion rate and good in spinning performance; according to the method, original reaction equipment does not need to be changed, reaction process parameters are also in original design, and the method has practical application value.

The invention discloses a negative-electrode-free sodium battery based on hexagonal boron nitride modified electrolyte and a current collector, and belongs to the technical field of energy storage materials, the electrolyte comprises hexagonal boron nitride h-BN, sodium hexafluorophosphate NaPF6 and diethylene glycol dimethyl ether G2; the concentration of the sodium hexafluorophosphate is 1 mol / L, and the concentration of the hexagonal boron nitride is 150 g / L. And the current collector comprises a conductive agent SuperP, nano dispersed phase hexagonal boron nitride h-BN and a binder polyvinylidene fluoride (PVDF) in a mass ratio of 5: 5: 1, and the blade coating thickness is 20 [mu] m. The negative-electrode-free sodium battery comprises a battery shell, a positive pole piece, an electrolyte, a current collector and a diaphragm located between the positive pole piece and a negative pole piece are arranged in the battery shell, the electrolyte is an organic electrolyte with hexagonal boron nitride, and the current collector is a current collector with a nano dispersed phase. According to the synergistic effect of the current collector and the electrolyte, the problem that the negative-electrode-free sodium battery cannot work under large current is solved.

The present invention provides a chemical synthesis method of EPS-G7, wherein β-cyclodextrin A is acetylated to obtain β-acetylcyclodextrin B, B is ring-opened in a mixed solution of acetic anhydride / concentrated sulfuric acid to obtain a chain acetylated heptose C, p-nitrophenol is condensed with intermediate C using boron trifluoride acetonitrile to obtain a key intermediate p-nitrophenyl (G1)-O-acetyl-D-maltoseptaglycoside D with α as the dominant configuration, D is removed from the acetyl group under the action of sodium methoxide to obtain pNP-G7 (p-nitrophenyl (G1)-D-maltoseptaglycoside), pNP-G7 is in the presence of p-toluenesulfonic acid and dimethoxyethane, and acetal protection is formed between the hydroxyl groups on C4 and C6 of the terminal monosaccharide to obtain EPS-G7. The reaction raw materials used in the method of the present invention are cheap and readily available, and the chemical synthesis of α-amylase detection reagent EPS-G7 is realized, which is a simple, economical and efficient synthesis method.

The invention belongs to the technical field of oilfield chemistry, and particularly relates to a degradable bio-based system for sand consolidation and profile control as well as a preparation method and application of the degradable bio-based system. The degradable bio-based system for sand consolidation and profile control is prepared from the following components in parts by weight: 15 to 25 parts of 1, 4: 3, 6-dianhydro-D-sorbitol / maleic anhydride biopolymer, 30 to 40 parts of resin, 10 to 15 parts of ethylene glycol dimethyl ether, 5 to 8 parts of flexibilizer, 10 to 12 parts of curing agent and the balance of water according to the total weight of 100 parts. The degradable bio-based system for sand consolidation and profile control provided by the invention not only has good sand consolidation performance and can solve the problem of sand production of a water well, but also has certain effects of blocking a high-permeability layer and adjusting the section of a reservoir near a water injection well, and has the functions of sand consolidation and profile control of the water well.

A composite electrolyte and a lithium battery. The composite electrolyte comprises a first lithium salt and a composite solvent; the composite solvent comprises ethylene glycol dimethyl ether (DME) and / or 1,3-dioxolane (DOL) and a fluorine-containing ether compound, and the molar ratio of DME and DOL to the fluorine-containing ether compound is 1:0.2-10; the fluorine-containing ether compound is represented by formula R1-O-R2; and in the formula, R1 is a C1-C10 fluoroalkyl or fluoroalkoxyalkyl group, and R2 is any C1-C5 fluoroalkyl or fluoroalkoxyalkyl group. The composite electrolyte can significantly improve the number of cycles and the charge-discharge rate of the lithium metal battery, and improves the performance and safety of the battery.

The invention relates to an electrolyte formula, a sodium secondary battery and electric equipment in the technical field of sodium secondary batteries. Aiming at the problems of limited capacity release, short cycle life and the like of a sodium secondary battery, a slightly soluble electrolyte is researched and developed. The preparation method of the electrolyte comprises the step of mixing diethylene glycol dimethyl ether and sodium tetrafluoroborate according to a certain molar ratio to form a new slightly soluble electrolyte. The method has the advantages that the solvent and salt are strongly coordinated, nonmetal fluoride distribution is induced, and solvent side reaction is reduced. The sodium secondary battery based on the electrolyte is excellent in cycling stability, effectively solves the problem that an electrode / electrolyte interface in the sodium battery is uneven and thick, ensures the stability of an electrode structure, and has a good application prospect.

The invention discloses a sodium-philic current collector and a negative-electrode-free sodium ion battery comprising the same. According to the sodium-philic current collector, carbon-coated aluminum foil is subjected to nitrogen plasma treatment, nitrogen doping sites are formed on a carbon-coated layer, the affinity to sodium can be enhanced, and uniform deposition of sodium is promoted; according to the electrolyte, a cosolvent of diethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether is adopted, sodium hexafluorophosphate, sodium tetrafluoroborate and sodium trifluoromethanesulfonate are compounded, (3-fluorophenyl)-oxoacetonitrile and allyl methyl carbonate are added to serve as electrolyte additives, a weak solvation structure is formed, a solid electrolyte interfacial film rich in boron and fluorine is constructed, and side reactions are inhibited; sodium oxalate is added to the positive electrode as a sodium supplementing agent to make up the loss of active sodium caused by low first charge-discharge efficiency. The invention solves the problems of low first charge-discharge efficiency and poor dendritic crystal growth and cycle stability of the non-anode sodium ion battery, has high energy density and process simplicity, and is suitable for large-scale production.

The present invention belongs to the technical field of fabric color fixing agents and provides a novel acidic color fixing agent free of bisphenol S and a preparation method thereof; the acidic color fixing agent is composed of the following components in parts by weight: 15-25 parts of water, 10-15 parts of phenol, 15-25 parts of dimethylacetamide, 2-5 parts of sodium sulfite, 10-15 parts of acetic acid, 5-7 parts of concentrated sulfuric acid, 15-20 parts of acrylic acid, 2-5 parts of ethylene glycol dimethyl ether, and 1-3 parts of sorbitol; the preparation method comprises the following steps: mixing a formula amount of phenol, dimethylacetamide, acrylic acid, acetic acid, and sodium sulfite, heating, adding concentrated sulfuric acid to react, cooling, adding a formula amount of water, and adding a formula amount of ethylene glycol dimethyl ether and sorbitol to obtain the product. Compared with the prior art, the present invention does not contain bisphenol S, has a good color fixing effect, can effectively improve various fastnesses such as water fastness, perspiration fastness, and seawater resistance, has little effect on the color change of the fabric after treatment, and has good tolerance to hardness ions.

The invention discloses a wide-voltage wide-temperature-range sodium-ion battery electrolyte and a preparation method and application thereof, and belongs to the technical field of sodium-ion battery electrolytes.The wide-voltage wide-temperature-range sodium-ion battery electrolyte comprises sodium salt, an organic solvent and an additive, the organic solvent is selected from one or more of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, dimethyl carbonate, diethyl carbonate, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether and triethylene glycol dimethyl ether, and the additive is selected from one or more of fluoroethylene carbonate, allyl-1, 3-propane sultone, 1, 3-propylene sultone, 1, 3-propylene sultone and 1, 3-propylene sultone. The additive is one or more of 1, 3-propyl sultone, methylene methane disulfonate, ethylene sulfate, trifluoromethanesulfonic anhydride, pentaerythritol bicyclic sulfate, tri (trimethylsilane) phosphate, tri (trimethylsilane) phosphite, tri (trimethylsilane) borate, acesulfame sodium and aluminum trifluoromethanesulfonate, and the additive is one or more of 2, 3-propylene sultone, methylene methane disulfonate, ethylene sulfate, trifluoromethanesulfonic anhydride, pentaerythritol dicyclosulfate, tri (trimethylsilane) phosphate, tri (trimethylsilane) phosphite, tri (trimethylsilane) borate, tri (trimethylsilane) phosphate and tri (trimethylsilane) borate. The electrolyte provided by the invention not only keeps high coulombic efficiency at low temperature, but also has good cycle stability at high temperature.

The invention discloses a sodium metal battery high-voltage fast-charging electrolyte and a preparation method and application thereof, and belongs to the technical field of sodium metal batteries. The electrolyte comprises a sodium salt, an organic ester and linear ether hybrid solvent, the volume ratio of the organic ester solvent to the linear ether solvent in the electrolyte is (3-5): (5-7), and the concentration of the sodium salt is 0.5-1.5 mol L; the organic ester solvent is fluoroethylene carbonate (FEC); the linear ether solvent is one or two of diethylene glycol dimethyl ether (DEGDME) and tetraethylene glycol dimethyl ether (TEGDME); and injecting the electrolyte into the sodium metal battery to obtain the high-voltage sodium metal battery. The high-voltage fast-charging electrolyte provided by the invention has a 5V electrochemical window, a sodium fluoride-rich solid electrolyte membrane with high ionic conductivity and strong mechanical property is formed in situ in the charging and discharging process, and continuous decomposition of a solvent can be inhibited, so that the energy density and the cycling stability of a battery are remarkably improved, and the fast-charging performance of the sodium metal battery is met.

In one example of a method for improving the performance of a silicon-based negative electrode, the silicon-based negative electrode is pre-lithiated in an electrolyte containing a lithium salt dissolved in a solvent mixture of dimethoxyethane (DME) and fluoroethylene carbonate (FEC). DME and FEC are present in a volume-to-volume ratio of 10:1 to 1:10. The pre-lithiation forms a solid electrolyte intermediate phase on an exposed surface of the negative electrode.

A low-concentration and low-temperature electrolyte for sodium ion batteries and a preparation method and application thereof, which relates to an electrolyte for sodium ion batteries and a preparation method and application thereof. It aims to solve the technical problems of high cost and low specific capacity of existing low-concentration electrolytes for sodium ion batteries. The electrolyte of the present invention is a mixture of sodium salt, a strong solvating ether solvent and a weak solvating ether solvent, wherein the strong solvating ether solvent is ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether or tetraethylene glycol dimethyl ether; the weak solvating ether solvent is dimethoxymethane, dimethoxyethane, trimethoxymethane or trimethoxyethane; the preparation method is: dissolving the sodium salt in a solvent in an anhydrous and oxygen-free argon glove box; the sodium ion battery assembled with the electrolyte has an initial specific capacity of 300 mAh g at -20°C. ‑1 , 230mAh g after 120 cycles ‑1 The battery has an operating temperature of ‑20~25℃ and can be used in the field of sodium ion batteries.

The invention discloses a preparation method of a flame-retardant solid polymer electrolyte and application thereof in a lithium battery, and belongs to the field of lithium batteries. The specific preparation process of the flame-retardant solid polymer electrolyte comprises the following steps: dissolving trifluoro and octafluoro nucleophilic reagents and dichloropolyphosphazene in tetrahydrofuran, and carrying out nucleophilic substitution reaction to generate a linear trifluoro and octafluoro substituted phosphazene polymer FPZ; then, FPZ is added into a polyvinylidene fluoride-hexafluoropropylene mixed solution dissolved by ethylene glycol dimethyl ether, and the flame-retardant solid polymer electrolyte is obtained. The preparation raw materials of the flame-retardant solid polymer electrolyte also comprise an inorganic filler and a lithium salt. According to the invention, polyphosphazene is used as a flame retardant, the fluorinated structure of polyphosphazene enhances the compatibility with polyvinylidene fluoride-hexafluoropropylene, weakens the interaction with lithium ions, promotes the formation of an inorganic fluorinated SEI layer, and effectively inhibits the growth of lithium dendrites. The electrolyte provided by the invention has excellent flame retardant property and conductivity.

According to the method, aryl anhydride and aryl bromide are used as main raw materials, N, N-dimethylacetamide is used as a solvent, 5mol% of bis (triphenylphosphine) palladium dichloride and 5mol% of ethylene glycol dimethyl ether nickel bromide are used as catalysts, 10mol% of 2-(dicyclohexylphosphine) 3, 3 '-dicyclohexylphosphine is used as a catalyst, and the asymmetric diaryl ketone compound is prepared through a one-step reaction. The method comprises the following steps: by taking 2, 6-dimethoxy-2 ', 4', 6 '-triisopropyl-1, 1'-biphenyl and 5mol% alpha, alpha, alpha-terpyridyl as ligands, one equivalent of sodium sulfate as an additive and two equivalent of zinc powder as a reducing agent, putting the materials into a reaction container in a nitrogen atmosphere, heating to 40 DEG C, and reacting for 12 hours to obtain the asymmetric diaryl ketone compound I with high yield. The method has the advantages of simplicity and convenience in operation, mild reaction conditions, high yield, few additives, high selectivity and the like, and has certain feasibility for realizing industrial production.

An electrolytic solution for a lithium metal battery, including an electrolyte salt and an organic solvent, the electrolyte salt including lithium bis-fluorosulfonylimide (LiFSI); the organic solvent including 1,2-dimethoxyethane (DME) and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE); the electrolytic solution further including a first compound that is a polyethylene glycol compound having an average molecular weight of 200 to 1200 and that is included in the electrolytic solution for a lithium metal battery at 0.015% by mass or more and less than 0.3% by mass, and a second compound that is at least one selected from the group consisting of diglyme, triglyme, and tetraglyme and that is included in the electrolytic solution for a lithium metal battery at 0.1% by mass or more and less than 1.0% by mass.

The invention discloses an aluminum alloy complex cavity diffusion welding method, which is characterized in that a uniform and compact organic molecule adsorption protection layer is formed on the surface of aluminum by completely immersing a cleaned blank in a diethylene glycol dimethyl ether solution for ultrasonic-assisted treatment. The protective film can effectively isolate air at normal temperature and prevent the oxidation film from regenerating; and in the initial stage of diffusion welding temperature rise, the aluminum alloy can be completely decomposed and volatilized, no impurity is left, and the high-activity clean aluminum surface is exposed. According to the method, diffusion welding is carried out under the conditions that the vacuum degree is high, the temperature is 500-560 DEG C and the pressure is 5-15 MPa in cooperation with a positioning tool system matched with the thermal expansion coefficient, aluminum atoms are fully diffused under the condition that no oxidation film hinders exist, and high-quality metallurgical bonding is formed. By means of the technical scheme, the problem that the welding rate is low due to an oxidation film on the surface of the aluminum alloy is successfully solved, meanwhile, the defects of ultrahigh vacuum equipment input and middle layer material introduction are overcome, and the manufacturing quality and production efficiency of complex aluminum alloy components are greatly improved.

The invention discloses a lithium nitrate sustained-release membrane as well as a preparation method and application thereof, and belongs to the technical field of sustained-release membranes. The preparation method comprises the following steps: uniformly mixing a lithium nitrate solution and a polyvinylidene fluoride-hexafluoropropylene copolymer solution, and preparing by adopting a tape casting method. The lithium nitrate is used as a raw material, the lithium nitrate and the polyvinylidene fluoride-hexafluoropropylene copolymer are prepared into the sustained-release membrane by adopting a tape casting method, the production process is simple, the cost is low, rapid forming can be achieved under the room temperature condition, the prepared sustained-release membrane can effectively protect Al foil and prevent Al corrosion, and the application effect is remarkable. The lithium nitrate is introduced into ethylene glycol dimethyl ether, so that the solubility of the lithium nitrate is maximized, a high-concentration lithium nitrate slow-release film is obtained, and the lithium nitrate slow-release film is applied to protection of Al corrosion, so that Al foil can be more effectively protected, and the performance stability of a Li-Al battery is improved.

The invention belongs to the technical field of organic synthesis. The invention particularly relates to a synthesis method of chiral beta-diaryl ethanol. The physiological activity, the pharmacological action and the material performance of the chiral molecule are directly determined by the spatial configuration of the chiral molecule. Therefore, efficient construction of chiral compounds is always the core research direction of organic synthesis and medicinal chemistry. Wherein the chiral beta-diaryl ethanol is a kind of key intermediates with irreplaceable application value. According to the invention, the Suzuki-Miyaura type asymmetric ring-opening coupling reaction of nickel catalyzed aryl epoxy and aryl boric acid with high stereoselectivity is realized, and the asymmetric ring-opening coupling reaction is used for synthesizing chiral beta-diaryl alcohol compounds. The method is wide in substrate compatibility and raw material source, mild in reaction condition, free of exogenous alkali and convenient to operate. An aryl epoxy compound and arylboronic acid are used as raw materials, diethylene glycol dimethyl ether nickel bromide is used as a catalyst, chiral biimidazoline is used as a ligand, under the promotion of sodium iodide, reaction is performed in an ethanol solvent according to the following reaction formula at the temperature of 50 DEG C for 10 hours, and the chiral beta-diaryl ethanol compound with the high ee value is obtained.

This invention relates to the field of electrochromic thin film technology, and more particularly to a dithiophene derivative, its preparation method, and its application, as well as an electrochromic thin film and its preparation method. This invention involves reacting dithiophene with tributyltin chloride to generate tin-modified dithiophene, reacting dithiophene with isopropanol pinacol boronic acid ester to generate boron-modified dithiophene, and then reacting the tin-modified or boron-modified dithiophene with 1,4-diiodo-2,5-bis-(6-hexynyl)-benzene to generate 1,4-dithiophene-2,5-bis-(6-hexynyl)-benzene. This product is then reacted with dimethylboron hydride generated from lithium aluminum hydride and dimethoxyethane to finally obtain the dithiophene derivative. This derivative can be applied in electrochromic thin films. This invention successfully prepares an electrochromic thin film with fast response and fluoride ion detection capability by electrochemically polymerizing the dithiophene derivative.

The application discloses a developing etching process for producing a PCB (Printed Circuit Board), and belongs to the field of PCB processing, which comprises the following steps: S1, using a pre-etching agent to pre-etch the PCB; S2, using an etching-resistant agent to etching-resistantly treat the line sidewall of the PCB after pre-etching; S3, using a main etching agent to etch the PCB after pre-etching after etching-resistant treatment; the pre-etching agent comprises the following components in parts by weight: 30-40 parts of citric acid, 5-8 parts of EDTA, 3-5 parts of a non-ionic or anionic surfactant, and 1-3 parts of a coupling agent; the main etching agent comprises the following components in parts by weight: 40-50 parts of ferric chloride, 10-15 parts of maleic acid, 10-15 parts of an amino acid, 3-5 parts of hydrogen peroxide, 1-3 parts of a pH regulator, and 1-2 parts of a rare earth oxide; the etching-resistant agent is a resin containing a double bond and ethylene glycol dimethyl ether, and the mass ratio of ethylene glycol dimethyl ether to the resin containing a double bond is 1:10. The application can guarantee high-quality etching effect and solve the problem of etching measurement.

The invention relates to the technical field of batteries, and discloses an electrolyte and application thereof, and a lithium carbon fluoride battery. The electrolyte comprises a lithium salt and an organic solvent; wherein the lithium salt is lithium bis (fluorosulfonyl) imide; the organic solvent is selected from one of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene carbonate, propylene carbonate, dimethyl carbonate, ethyl methyl carbonate, dimethylformamide, dimethylacetamide and dimethyl sulfoxide. The electrolyte can be applied to preparation of a lithium primary battery. The invention also relates to a lithium carbon fluoride battery comprising the electrolyte. The electrolyte system provides an optimized solution for the preparation of the high-energy-density lithium carbon fluoride battery, has a wide application prospect, can remarkably improve the performance of the battery, reduces the production cost, and promotes the further development of the lithium carbon fluoride battery technology.

The present application relates to an electrolyte composition for a lithium secondary battery and a lithium secondary battery comprising the same, the electrolyte composition comprising a lithium salt and an organic solvent. The organic solvent includes a first ether solvent (R-O-R ') having a fluorinated alkyl group, and a second ether solvent. The first ether solvent may be 5-ethoxy-1, 1, 2, 2, 3, 3, 4, 4-octafluoropentane, 1, 1, 2, 2, 3, 3, 4, 4-octafluoro-5-methoxypentane, or a mixture thereof, and the second ether solvent may be selected from the group consisting of dimethoxyethane, diethyl ether, and similar ethers. The lithium salt includes a compound such as LiTFSI, LiFSI, or LiPF6. The first ether solvent accounts for 30% to 90% by volume of the electrolyte, wherein the concentration of the lithium salt ranges from 0.1 M to 3.0 M. The electrolyte composition enhances battery stability and makes it suitable for use in lithium secondary batteries and lithium metal secondary batteries.

The invention relates to a cross electrophilic coupling reaction method of aryl sulfone compounds and aryl halides. A series of (hetero) biaryl structure compounds are obtained. The reaction does not need anhydrous and anaerobic protection, is driven by electrochemistry at room temperature, takes a nickel bromide (II) diethylene glycol dimethyl ether compound as a catalyst, takes 2, 2 '-bipyridine or 2, 2'-bipyridine-5, 5 '-dimethyl phthalate as a ligand, takes lithium bromide as an electrolyte, takes a stainless steel sheet or a zinc sheet as an anode, takes foamed nickel as a cathode, and takes nickel hydroxide as a cathode. The preparation method comprises the following steps: placing an aryl sulfone compound and aryl halide in N, N-dimethylformamide, respectively electrifying a positive electrode and a negative electrode for 10 hours, and carrying out column chromatography purification by using an automatic column chromatography machine to obtain the biaryl compound. By adopting the method, not only can a series of important drug molecules be synthesized, but also electrochemical polymerization reaction can be performed.

The invention discloses an electrolyte, a lithium ion battery and an electronic product. The electrolyte comprises electrolyte salt and a solvent; wherein the concentration of the electrolyte salt is 0.1 mol / L-5 mol / L, and the ether solvent comprises one or more of dimethoxymethane, diethoxymethane, 1, 2-diethoxyethane, 1, 3-dioxolane, 1, 3-dioxane, 1, 4-dioxane, tetrahydrofuran, 2-methyltetrahydrofuran, tetrahydropyran, diethyl ether, cyclopentyl methyl ether, triethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether. According to the electrolyte provided by the invention, the ether solvents are reasonably screened, and the ether solvents with relatively weak lithium salt dissolving capacity are selected, so that the electrolyte forms contact ion pairs and aggregation ion pairs at low concentration, and then anion derivative interface chemistry is introduced, and the obtained electrolyte reduces co-intercalation behaviors and is relatively good in stability at low temperature; the method is suitable for low-temperature environments.