71 results about "Diethylene glycol dimethyl ether" patented technology

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 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 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 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.

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.

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 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.

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 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 problem to be solved by the present invention is to provide an electrolyte solution for a lithium metal battery, which can easily improve the durability of the lithium metal battery and can suppress an increase in battery resistance. In order to solve the problem, the present invention provides an electrolyte solution for a lithium metal battery, in which an electrolyte salt contains lithium bis-fluorosulfonyl imide (LiFSI), an organic solvent contains 1, 2-dimethoxyethane (DME), and 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether (TTE), the electrolyte solution for a lithium metal battery further comprises: a polyethylene glycol compound having an average molecular weight of 200-1200, wherein the electrolyte solution for a lithium metal battery contains 0.015% by mass or more and less than 0.3% by mass of a first compound; and at least one compound selected from the group consisting of diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, and tetraethylene glycol dimethyl ether. The electrolyte solution for a lithium metal battery contains 0.1% by mass or more and less than 1.0% by mass of a second compound.

The invention discloses an electrolyte for improving dynamics of a strong-coordination solvent passivated low-temperature lithium metal battery, and belongs to the technical field of electrolytes. The electrolyte comprises the following components: lithium salt, an organic solvent and an additive, wherein the additive comprises at least two of fluoroethylene carbonate, fluoropropylene carbonate, diethylene glycol dimethyl ether, 1, 1, 2, 2-tetrafluoroethyl 2, 2, 3, 3-tetrafluoropropyl ether, ethylene glycol dimethyl ether, 2, 2, 2-trifluoroethyl ether, methyl trifluoroethyl carbonate and triethylene glycol dimethyl ether. The electrolyte prepared by the invention can keep good conductivity and battery reaction power in a low-temperature environment, has relatively high power and capacity, can ensure rapid and efficient transmission of lithium ions in an electrode solution, accelerates the charging and discharging speed of the battery, shortens the charging time, has good compatibility with positive and negative electrode materials, reduces interface side reactions, and improves the service life of the battery. And the battery has higher energy output under the same volume or weight, and the cruising ability of the battery is effectively improved.

The invention discloses odorless ink for a printer, which comprises a coloring agent, a solvent, a surfactant, a thermal insulation agent, a viscosity modifier, an antibacterial agent, a dispersing agent, a thickening agent and a PH modifier, the humectant is diethylene glycol diethyl ether, and the other components comprise, by weight, 72-87% of diethylene glycol diethyl ether, 8-15% of diethylene glycol dimethyl ether, 8-15% of diethylene glycol dimethyl ether, 8-15% of diethylene glycol dimethyl ether, 8-15% of diethylene glycol dimethyl ether, 8-15% of diethylene glycol dimethyl ether, 8-15% of 2-5% of organic pigment and 3-8% of vinyl chloride-vinyl acetate resin. Compared with the prior art, the odorless ink has the advantages that the odorless ink is environment-friendly and economical, so that the using effect of the odorless ink is improved.

The invention discloses a linear ether and cyclic ether mixed electrolyte for a wide-temperature-range sodium-ion battery as well as a preparation method and application of the linear ether and cyclic ether mixed electrolyte, and relates to a wide-temperature-range electrolyte as well as a preparation method and application of the wide-temperature-range electrolyte. The invention discloses a linear ether and cyclic ether mixed electrolyte for a wide-temperature-range sodium-ion battery. The linear ether and cyclic ether mixed electrolyte comprises sodium salt and an ether-based solvent, the sodium salt is sodium trifluoromethanesulfonate; the ether-based solvent is a mixed solution of straight-chain ether and cyclic ether; the straight-chain ether is diethylene glycol dimethyl ether; the cyclic ether is tetrahydrofuran or dimethyl tetrahydrofuran. The straight-chain ether and cyclic ether mixed electrolyte of the wide-temperature-range sodium-ion battery provided by the invention has a low freezing point, low viscosity, high ionic conductivity and high sodium ion transference number in a wide temperature range, and low desolvation energy, and can reduce the interface charge transfer impedance of an electrode-electrolyte, so that the performance of the battery is improved. Sodium ions can be quickly embedded and separated when reaching the electrode, so that the wide-temperature-range performance of the sodium ion battery is improved, and the sodium ion battery has excellent wide-temperature-range charge-discharge specific capacity, cycling stability and high-rate performance.

The invention provides a lithium ion battery electrolyte, a battery and an electrochemical device, and relates to the technical field of energy storage and power batteries, the electrolyte comprises a lithium salt, an organic solvent and a film-forming additive, the organic solvent comprises at least one of carboxylic ester, ethers and nitriles; the ethers comprise ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, tetrahydrofuran or 1, 3-dioxolane; the nitrile comprises at least one of acetonitrile and butyronitrile. According to the invention, the electrolyte can maintain the physical characteristics of low viscosity and high conductivity in a low-temperature environment, so that the migration and diffusion rate of the electrolyte in the low-temperature environment of-60 DEG C is effectively improved; the low-temperature discharge capacity retention ratio at the temperature of minus 60 DEG C reaches 65.23%-68.71%, and the cycle capacity retention ratio at the temperature of minus 40 DEG C reaches 70.12%-73.83%.

The invention relates to a method for improving specific discharge capacity and sodium storage performance of a sodium-ion battery, and belongs to the technical field of sodium-ion batteries. The ether-based electrolyte is adopted, the sodium titanium phosphate-based electrode plate is used as the cathode, the sodium vanadium phosphate is used as the anode, and the sodium ion battery is assembled, so that the specific discharge capacity and the sodium storage performance of the sodium ion battery are improved; the electrolyte of the ether-based electrolyte is NaPF6, the solvent is diethylene glycol dimethyl ether, and the concentration of the electrolyte NaPF6 is 1-1.5 mol / L. The sodium ion battery disclosed by the invention has the specific discharge capacity of 290 to 311 mAh / g and the specific discharge energy of 290 to 329 mWh / g in a voltage interval of 3 to 0.01 V; meanwhile, good rate capability is achieved at the low rate of 0.1 C (239 mAh / g) and the high rate of 10 C (238 mAh / g); the material has the stable performance of 2000 cycles under high rate (the specific capacity retention rate is still 90% under the rate of 20C).

The application provides a positive photoresist composition, which comprises a phenolic resin, a photosensitive compound and a mixed solvent, wherein the mixed solvent comprises a first solvent and a second solvent, the first solvent is selected from at least one of ethyl lactate, ethyl 3-ethoxypropionate, 4-methyl-2-pentanone and 2-heptanone; and the second solvent is selected from at least one of ethylene glycol monomethyl ether, propylene glycol monomethyl ether, diethylene glycol monomethyl ether, diethylene glycol dimethyl ether, propylene glycol methyl ether acetate, ethyl acetate and n-butyl acetate. The photoresist composition provided by the application has better stability than a photoresist composition using a single solvent, and can be better applied to an organic electroluminescent display.

This invention discloses a bio-based high-efficiency antibacterial polyester fiber and its preparation method, belonging to the field of synthetic fiber technology. It solves the problems of high hue, low bio-based content, and weak antibacterial performance in existing technologies. The fiber is copolymerized from a first, second, third, and fourth ester. The first ester is formed by esterification of oxalic acid and 1,3-propanediol; the second ester is formed by esterification of an aliphatic diacid and 1,3-propanediol; the third ester is formed by esterification of a quaternary ammonium salt of hydroxy fatty acids; and the fourth ester is formed by esterification of terephthalic acid and ethylene glycol. This invention uses oxalic acid, aliphatic diacids, 1,3-propanediol, and quaternary ammonium salts of hydroxy fatty acids to prepare polyester fibers, achieving a bio-based carbon content of over 30%. The entire preparation process eliminates the need for diethylene glycol dimethyl ether, a solvent required in existing technologies, thus solving the problem of high hue caused by solvent residue. The fiber maintains highly efficient and long-lasting broad-spectrum antibacterial properties, with an antibacterial rate exceeding 99%.

The invention discloses a dianion salt-based magnesium fuel cell electrolyte and a preparation method, and belongs to the technical field of magnesium fuel cells, the electrolyte is composed of dianion composite magnesium salt, propylene carbonate (PC), tetrahydrofuran (THF), magnesium fluoride (MgF) nanoparticles, 1, 3-dioxolane (DOL), diethylene glycol dimethyl ether (G2) and trimethyl phosphate (TMP) according to a specific mass percentage, and the dianion salt-based magnesium fuel cell electrolyte is prepared from dianion composite magnesium salt, propylene carbonate (PC), tetrahydrofuran (THF), magnesium fluoride (MgF) nanoparticles, 1, 3-dioxolane (DOL), diethylene glycol dimethyl ether (G2) and trimethyl phosphate (TMP) according to a specific mass percentage. The mass ratio is 1: (1.6-2.0). The preparation method comprises the four steps of composite salt preparation, solvent dehydration, salt dissolution and additive mixing, and the ionic conductivity and thermal stability of the electrolyte are improved through specific ultrasonic parameters, dehydration conditions and annealing treatment.

The invention relates to the technical field of electrolytes, in particular to a dianion salt magnesium fuel cell non-aqueous electrolyte which is composed of the following components: composite salt, a mixed solvent, magnesium fluoride (MgF) nanoparticles, 1, 3-dioxolane (DOL), diethylene glycol dimethyl ether (G2) and trimethyl phosphate (TMP). According to the invention, a composite salt system composed of magnesium trifluoromethanesulfonate and magnesium bis (trifluoromethanesulfonyl) imide is adopted, and the ion transmission capability of the electrolyte is significantly improved through a dianion synergistic effect.

The present invention discloses a preparation method of a stock solution colored acrylic black fiber and the fiber. The preparation method of the acrylic black fiber includes: adding a black color paste into a polyacrylonitrile solution, mixing evenly and then spinning to obtain the acrylic black fiber. The black color paste includes a solvent, a dispersant and carbon black. The mass ratio of the solvent in the black color paste is 75-88%, the mass of the dispersant is 14%-40% of the mass of the carbon black, and the dispersant includes diethylene glycol dimethyl ether and a polymer. The mass ratio of the carbon black in the black color paste to the polyacrylonitrile in the polyacrylonitrile solution is 0.01-4.5:100. The solvent-based black color paste prepared by the present invention has good dispersibility, good compatibility with the acrylic spinning stock solution, good spinnability after being mixed into the acrylic spinning stock solution, few blocked spinneret holes, little color loss in the coagulation bath, and good quality of the acrylic black fiber.

The application discloses an ultralow-temperature aluminum electrolytic capacitor and a preparation method thereof. The capacitor comprises an anode foil, a cathode foil, an electrolytic paper between the anode foil and the cathode foil, and an electrolyte solution contained in the electrolytic paper. The electrolyte solution comprises, by weight percentage, propylene carbonate 15-25%, methyl ethyl carbonate 20-28%, diethylene glycol dimethyl ether 16-26%, lithium tetrafluoroborate 7-12%, lithium bisfluorosulfonylimide 2-5%, lithium difluorobisoxalate borate 2-5%, vinyl sulfate 4-8%, methanedisulfonate methylene 1.5-3.5%, mesoporous silicon dioxide 4-9%, lithium hexafluorophosphate 0.2-1.0%, lithium bis-trifluoromethanesulfonylimide 1.5-5%, a chelating agent 0.01-0.05%, and p-nitrophenol 0.3-1.2%. The preparation method comprises core wrapping, drying treatment, ring-type immersion, liquid removal treatment, assembly waist bundling, and aging treatment. The capacity retention rate of the capacitor can reach more than 90% at an ultralow temperature of -55 DEG C, and the Z ratio is only 1.29, so that the ultralow temperature and high temperature stability are synergistically improved.

The invention discloses a low-temperature lithium-sulfur battery electrolyte and a lithium-sulfur battery containing the electrolyte, and relates to the technical field of lithium-sulfur batteries. The electrolyte comprises a solvent, a lithium salt and an additive, the solvent is an ether solvent with a chain-shaped or cyclic molecular structure or a composite solvent composed of the ether solvent, preferably one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, 1, 3-dioxolane, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether; the additive is a borate or borane anion acceptor with an electron-deficient structure. According to the low-temperature lithium-sulfur battery electrolyte provided by the invention, an anion acceptor additive with an electron-deficient structure and electron-rich sulfur have relatively strong interaction, so that the dissolution of lithium polysulfide is promoted, the formation of lithium polysulfide clusters is prevented, and the reaction kinetics of the lithium polysulfide is promoted; and the sulfur utilization rate of the battery under a poor electrolyte condition and a low-temperature condition is improved.

The invention discloses a battery monomer, a battery and electric equipment, the battery monomer comprises a shell, an exhaust assembly and an electrolyte, the exhaust assembly is arranged on a wall part, and the exhaust assembly is used for exhausting gas in the shell; the accommodating cavity is filled with the electrolyte; the electrolyte comprises a first component; the first component is prepared from dimethyl carbonate, 2-methyltetrahydrofuran, diethylene glycol dimethyl ether, diethylene glycol dimethyl ether, succinonitrile, glutaronitrile, methyl formate, ethyl formate, methyl acetate, ethyl acetate, methyl acrylate, dimethyl sulfite, diethyl sulfite, methyl ethyl sulfite and 3-methyl-2-butanone; and one or a mixture of two or more of 1, 3-methyl-2-butanone. Through the arrangement, the contradiction between the high battery performance requirement and the high gas yield can be balanced.

The invention belongs to the technical field of sodium-ion batteries, and discloses an ether-based electrolyte, a high-first-effect sodium-ion battery and a preparation method of the high-first-effect sodium-ion battery, and the preparation method of the ether-based electrolyte comprises the following steps: mixing sodium salt, an ether solution and an additive to obtain the ether-based electrolyte; the ether solution is ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether or diethyl ether. The ether-based electrolyte prepared by the invention has excellent cycling stability and coulombic efficiency, the average coulombic efficiency is greatly improved, and when the ether-based electrolyte is applied to the sodium-ion battery, the sodium-ion battery still has the average coulombic efficiency exceeding 99% and excellent first-circle coulombic efficiency after being circulated for 100 circles.

The invention discloses a preparation method of 3-chloro-5-fluoro-2-methyl benzoic acid, and relates to the technical field of production of 3-chloro-5-fluoro-2-methyl benzoic acid. 2-methyl-5-nitrobenzoic acid is used as an initial raw material, selective chlorination is performed on 2-methyl-5-nitrobenzoic acid and dichlorohydantoin in preheated high-temperature concentrated sulfuric acid, then esterification is completed through a one-pot method, and 3-chloro-5-fluoro-2-methyl benzoic acid is obtained. Under the synergistic effect of Raney nickel and platinum-carbon dual catalysts, catalytic hydrogenation reduction is carried out under low-pressure and low-temperature conditions to obtain a high-purity amino intermediate, stable thermal decomposition fluorination, alkaline hydrolysis and refining are carried out in a diethylene glycol dimethyl ether solvent to obtain a final product, and the obtained product is high in purity and yield.

The invention relates to the technical field of batteries, in particular to a high-voltage wide-temperature-range high-rate lithium battery electrolyte and application. The electrolyte comprises soluble lithium salt and a liquid component, the liquid component comprises a solvent and a diluent; the solvent is prepared from at least two of ethylene glycol dimethyl ether, tetrahydrofuran, 1, 3-dioxolane, diethyl ether, dimethoxymethane, diethylene glycol dimethyl ether and methyl fluorosulfonyl difluoroacetate; and the diluent comprises at least one of bis (2, 2, 2-trifluoroethyl) ether, 1, 2-difluorobenzene, fluorobenzene, and 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether. The electrolyte developed by the invention is used in the lithium battery, can stably work at-30 DEG C to 80 DEG C, has excellent electrochemical performance, and promotes formation of a solid interface film which is rich in inorganic matters and low in interface impedance, so that the phase change of a positive electrode structure of the battery is reduced.