55 results about "Diethylene glycol dimethyl ether" patented technology

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.

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 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 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 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.

The invention provides an ether electrolyte and a sodium ion battery thereof, the ether electrolyte comprises methyl 2, 2-difluoro-2-(fluorosulfonyl) acetate, an ether solvent and a sodium salt, and the ether solvent is ethylene glycol dimethyl ether, diethylene glycol dimethyl ether or triethylene glycol dimethyl ether. The sodium ion battery comprises a positive electrode, a negative electrode and the electrolyte, the electrolyte is the electrolyte, the positive electrode comprises a current collector and sodium vanadyl fluorophosphate (NVOPF) loaded on the current collector, and / or the negative electrode comprises a current collector and a hard carbon (HC) material loaded on the current collector. The ether electrolyte can improve the cycling stability of a hard carbon negative electrode and a sodium vanadyl fluorophosphate positive electrode.

The present invention provides a 1,3-butylene glycol product which is less likely to produce an apple odor or an irritating odor even if blended in a cosmetic composition.　Provided is a 1,3-butylene glycol product which has an area ratio represented by the following formula of 20 to 260 inclusive.　Area ratio = (peak X area) / (1,3 BG peak area) × 106 Peak X area: the area of peak X in an m / z145 ion chromatogram in Scan mode, the peak X having a relative retention time within the range of 6.6 to 6.7 when the relative retention time of the peak of diethylene glycol dimethyl ether, which is an internal standard substance, is taken as 1.0 in a gas chromatography analysis under specific conditions. 1,3 BG peak area: the area of a peak of 1,3-butylene glycol in an m / z72 ion chromatogram in Scan mode, the peak of 1,3-butylene glycol having a relative retention time within the range of 5.23 to 6.27 when the relative retention time of the peak of diethylene glycol dimethyl ether, which is an internal standard substance, is taken as 1.0 in a gas chromatography analysis under specific conditions.

The invention discloses an electrolyte with long circulation, low overpotential and high current density. The electrolyte comprises an organic solvent, magnesium salt and a trifluoromethanesulfonate additive, the organic solvent is one or more of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether and tetrahydrofuran; the magnesium salt is magnesium chloride; in the organic solvent, the concentration of the magnesium chloride is 0.1 mol / L to 0.4 mol / L, and the concentration of the trifluoromethanesulfonate additive is 0.1 mol / L to 1.0 mol / L. According to the rechargeable magnesium battery electrolyte, dissolution of magnesium salt is promoted, interface regulation and control can be carried out on a magnesium negative electrode interface, a double-electrode-layer structure beneficial to Mg < 2 + > migration and a stable SEI film are constructed, and therefore the battery has low overpotential, high ionic conductivity and excellent cycling stability under large current. The electrolyte is simple in preparation process and convenient for industrial popularization.

The invention provides a sodium-ion battery electrolyte, a preparation method and application thereof and a sodium-ion battery. The sodium-ion battery electrolyte comprises a sodium salt electrolyte, a first ether solvent and a second ether solvent, wherein the solvation effect of the first ether solvent is stronger than that of the second ether solvent, and the volume ratio of the first ether solvent to the second ether solvent is (1-3): (1-3); the first ether solvent is at least one of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether; and the second ether solvent is at least one of trimethyl orthoformate, dimethyl formal, dimethoxyethane and 1, 1, 2-trimethoxyethane. According to the invention, sodium ion kinetics can be improved at low temperature, high rate and high cycle stability at room temperature can be maintained to-30 DEG C, and high capacity and rate capability can be shown at low temperature.

The present invention provides a high cis-trans ratio 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol preparation method, which comprises: mixing 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanedione, a catalyst and a mixed solvent, and carrying out a hydrogenation reaction to obtain the high cis-trans ratio 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol, the mixed solvent comprises a first solvent and a second solvent; the first solvent comprises any one of diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, anisole, neopentyl glycol or 1, 2-butanediol or a combination of at least two of the diethylene glycol dimethyl ether, the triethylene glycol dimethyl ether, the anisole, the neopentyl glycol and the 1, 2-butanediol. According to the method, 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanedione is used as a raw material and is subjected to a hydrogenation reaction in a catalyst and mixed solvent system, and on the premise that the high conversion rate of TMCD and the high selectivity of the CBDO product are ensured, the CBDO product with the high cis-trans ratio can be prepared through a one-step method.

The application discloses an energy-saving and environment-friendly phase change CO2 capturing absorbent, which is prepared from a mixed solution of the following components in mass percentage: 20-30% of hydroxyethyl ethylenediamine, 20-30% of N-N diethylhydroxylamine and 50-60% of a solvent; the solvent is one of sulfolane, n-propanol, diethylene glycol dimethyl ether and dimethyl sulfoxide. The absorbent further comprises a nanoparticle reinforcing agent of iron oxide, and the nanoparticle reinforcing agent of iron oxide is added in an amount of 1.5-2.0% of the mass of the mixed solution. The CO2 absorbent in the application can increase the absorption capacity of CO2, improve the capture rate of CO2, reduce the regeneration energy consumption and improve the desorption effect, so that the energy-saving and environment-friendly treatment requirements of CO2 capture can be realized.

The invention discloses a low-cost and high-capacity intercalation-conversion type lithium battery and a preparation method thereof, and belongs to the technical field of lithium batteries. The lithium battery takes graphite paper coated with tetramethyl ammonium iodide and carbon black as a positive electrode; an aluminum foil coated with a lithium-rich material (lithium iron phosphate and a ternary lithium material) is used as a negative electrode, and an electrolyte is a mixed solution of dimethyl formamide dissolved with lithium bromide and lithium trifluoromethanesulfonate and diethylene glycol dimethyl ether. The intercalation-conversion type lithium battery with a novel structure and a novel material is constructed by adopting a lithium-rich material as a middle layer between aluminum and an electrolyte and combining a bromine / iodine synergistic double-electron transfer chemical mechanism at a positive electrode. The double-electron transfer process of iodine is realized, so that the discharge voltage and the discharge capacity are synchronously improved. The battery system shows double discharge platforms of 3.6 V and 3.0 V, the discharge capacity of 211 mAh / g, the energy density of 637 Wh / kg and the long service life of 2000 cycles. The system shows extremely high safety, can still operate normally after a physical damage test, and does not cause any safety accident. In addition, the battery system is simple in structure and has remarkable cost benefits.

The application discloses a kind of wide voltage wide temperature range sodium ion battery electrolyte and preparation method and application thereof, belong to sodium ion battery electrolyte technical field, include sodium salt, organic solvent and additive, the organic solvent is selected from one or more of carbonic acid ethylene ester, carbonic acid propylene ester, carbonic acid methyl ethyl ester, carbonic acid dimethyl ester, carbonic acid diethyl ester, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, the additive is selected from one or more of fluoro carbonic acid ethylene ester, propylene group-1,3-propyl sulfone lactone, 1,3-propyl sulfone lactone, methane disulfonic acid methylene ester, ethylene sulfate, trifluoromethanesulfonic anhydride, pentaerythritol double ring sulfuric acid ester, tris (trimethylsilyl) phosphate, tris (trimethylsilyl) phosphite, tris (trimethylsilyl) borate, acetylsulfanilic acid sodium, aluminium triflate, the electrolyte of the application not only maintains higher coulomb efficiency at low temperature, has better cycle stability at higher temperature.