226 results about "Dioxolane" 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 discloses a phenanthridine-6-formaldehyde derivative and a preparation method and application thereof.The preparation method comprises the steps that 2, 4, 5, 6-tetra (9-carbazolyl)-isophthalonitrile serves as a photocatalyst, 1-azabicyclo [2.2. 2] octane serves as a hydrogen atom transfer catalyst, a biphenyl isocyanide compound, the photocatalyst, the hydrogen atom transfer catalyst and an alkali additive are jointly dissolved in 1, 3-dioxolane, the mixture is stirred to be uniform, and the phenanthridine-6-formaldehyde derivative is obtained. And carrying out free radical tandem cyclization and acid-catalyzed hydrolysis reaction to obtain the phenanthridine-6-formaldehyde derivative. The invention also provides a specific reaction equation. According to the developed synthesis method of the phenanthridine-6-formaldehyde derivative, the compound can be efficiently and conveniently prepared, the technical bottlenecks of harsh reaction conditions and tedious steps in a traditional process are successfully overcome, raw materials which are low in price and easy to obtain are adopted, operation is carried out under mild conditions, the synthesis method has the outstanding advantages of being high in yield, safe and simple to operate, environmentally friendly and the like, and the method is suitable for industrial production. Good industrial application potential is shown.

The present disclosure provides for improved compositions of ionizable lipid nanoparticles for the delivery of therapeutic nucleic acids to cells. Anionic phospholipids, including phosphatidylserine and phosphatidylglycerol are included in the lipid nanoparticles to increase the transfection efficiency in human dendritic cells. The further incorporation of mono-unsaturated alkyl chain analogs in dimethylaminopropyl-dioxolane or heterocyclic ketal ionizable lipids in the formulation demonstrated high levels of transfection in human dendritic cells, compared to other ionizable lipids in the same family, and demonstrated good stability to oxidative damage. Finally, the use of an ammonium salt of phosphatidylserine allows for the efficient production of PS-targeted LNPs.

The invention belongs to the field of membrane materials, and particularly relates to a polyether-based block copolymer and a preparation method and carbon capture application thereof. According to the invention, dichloromethane is taken as a solvent, trifluoromethanesulfonic acid is taken as an initiator, and in the presence of a chain transfer agent ethylene glycol, 1, 3-dioxolane is subjected to cationic ring-opening polymerization to generate PDXL (HO-PDXL-OH) of which two terminal groups are hydroxyl groups. Further, N, N-dimethylformamide is used as a solvent, dibutyltin dilaurate is used as a catalyst, and HO-PDXL-OH and diphenylmethane diisocyanate are subjected to polycondensation to synthesize block copolymer polyurethane (PU). The polyether-based segmented copolymer prepared by the preparation method disclosed by the invention is used as a gas separation membrane material and has relatively high CO2 capture performance, and the CO2 separation performance of the polyether-based segmented copolymer is superior to that of other polyether-based membrane materials and is close to the Robeson upper limit.

The invention discloses a preparation method of a poly (1, 3-dioxolame)-based composite electrolyte, and belongs to the technical field of sodium ion batteries. The preparation method comprises the following steps: adding a sodium salt and a 1, 3-dioxolame monomer into a solvent, then mixing with an additive to obtain a precursor, and carrying out standing and polymerization curing treatment to obtain the poly (1, 3-dioxolame)-based composite electrolyte. According to the invention, the polymerization curing time of the precursor is greatly shortened by optimizing a solvent system; the additive is introduced into the precursor, the additive comprises a cross-linking agent and / or an inorganic filler, the cross-linking agent is trimethylolpropane triglycidyl ether, and the inorganic filler is NASICON type solid electrolyte powder, so that the ionic conductivity of the poly (1, 3-dioxolame)-based composite electrolyte is effectively improved, and the service life of the poly (1, 3-dioxolame)-based composite electrolyte is prolonged. And the cycling stability and the first-cycle discharge specific capacity of the assembled battery are remarkably improved.

The invention discloses a low-temperature high-conductivity composite solid-state electrolyte membrane and a preparation method and application thereof, and relates to the technical field of solid-state lithium battery materials, the low-temperature high-conductivity composite solid-state electrolyte membrane comprises: a polymer matrix composed of poly (1, 3-dioxolame) and a polyvinylidene fluoride-hexafluoropropylene copolymer; the ion conduction network is composed of a metal organic framework filler with the surface modified with-SO3Li groups and sulfonic acid lithiated carbon nanotubes arranged in the axial direction of the polymer matrix; a first anti-freezing interface layer and a second anti-freezing interface layer are arranged on the surfaces of the two opposite sides of the polymer matrix, and the first anti-freezing interface layer and the second anti-freezing interface layer are butanedinitrile-glutaronitrile eutectic plastic crystal layers composed of butanedinitrile, glutaronitrile, lithium salt and a nano reinforcing agent respectively. The solid electrolyte is suitable for polar scientific investigation equipment, spacecrafts and other low-temperature environments, and solves the industrial problems of sharp increase of low-temperature grain boundary impedance and interface contact failure of the traditional solid electrolyte.

A solid polymer electrolyte includes a charge transfer complex polymer matrix with a polar ring polymer matrix and an ethylene carbonate-based small molecule additive. In some variations, the ethylene carbonate-based small molecule additive is selected from one or more of ethylene carbonate (O═C1OCCO1) and 4-(fluoromethyl)-5-methyl-1,3-dioxolan-2-one (O═C1OC(C)C(CF)O1).

This application provides a method for preparing compound I-b or a pharmaceutically acceptable salt thereof, wherein (S)-N-methylamino-1-(2-thiophene)-1-propanol reacts with 4-fluorobenzo[1,3]dioxolane in a system containing sodium hydride and potassium benzoate to obtain compound I-b. This method has short steps, mild reaction conditions, and is simple to operate, making it suitable for industrial scale-up; moreover, the obtained product has high purity and low isomer content.

The invention provides a positive electrode material, a positive electrode plate, a preparation method of the positive electrode plate and a solid-state battery. The positive electrode material comprises a positive electrode active material and an organic coating layer coating the surface of the positive electrode active material, and the organic coating layer comprises a copolymer of maleic anhydride and 1, 3-dioxolane. In the positive electrode material, the surface of a positive electrode active material is coated with an organic coating layer, the organic coating layer contains a copolymer of maleic anhydride and 1, 3-dioxolane, and the organic coating layer can realize lithium ion transmission, so that the organic coating layer can form a continuous membrane structure to completely cover the surface of the positive electrode active material; when the positive electrode material is applied to the solid-state battery, the volume of the positive electrode active material can be changed in the charging and discharging process of the solid-state battery, and the organic coating layer can be used for restraining the positive electrode active material and effectively inhibiting the disintegration of the surface structure of the positive electrode active material, so that the stability of a solid-solid contact interface in the solid-state battery is improved.

The invention discloses a novel solvent system-based low-temperature lithium battery electrolyte and a production process, the novel solvent system-based low-temperature lithium battery electrolyte comprises the following components: a carbonic ester solvent, a lithium salt combination and an additive, the carbonic ester solvent comprises ethylene carbonate, fluoroethylene carbonate, 1, 3-dioxolame and ethyl methyl carbonate, and the lithium salt combination comprises a lithium salt combination and an additive; the lithium salt combination is a mixed system of lithium bis (fluorosulfonyl) imide and lithium hexafluorophosphate, and the additives are vinylene carbonate, succinonitrile, lithium nitrate, triphenyl phosphate and aluminum trifluoromethanesulfonate; according to the low-temperature lithium battery electrolyte, the performance bottleneck of a traditional electrolyte at the temperature of-40 DEG C to-30 DEG C is broken through through multi-level cooperation of solvent-lithium salt-additive preparation of the low-temperature lithium battery electrolyte, the solvent maintains low viscosity while reducing the freezing point, and low-temperature high dissociation and interface stability are achieved through lithium salt compounding; the compatibility of the solid electrolyte interfacial film structure and current collection is finely regulated and controlled through the additive, and the application requirement in the extremely cold environment is met.

The application provides a system and method for integrated acetaldehyde distillation and recovery, which comprises a vertically arranged main tower, the main tower is sequentially divided into a distillation section, a catalytic reaction section, a stripping section and a stripping section from top to bottom, the top of the distillation section is provided with a self-adaptive distributor and a tower top pressure controller, the catalytic reaction section comprises catalytic filler plates and a transverse liquid redistributor, and the catalytic filler plates are loaded with catalysts. The four sections of stripping, stripping, catalytic reaction and distillation are integrated in the vertical main tower, the intermediate cooling and conveying equipment are cancelled, and the investment and energy consumption are significantly reduced. The catalytic reaction section adopts the corrugated filler loaded with catalysts and cooperates with the transverse liquid redistributor, so that the liquid forms thin layer flow, the reaction residence time is effectively prolonged, and the hydrolysis decomposition rate of 2-methyl-1,3-dioxolane (MD) and the acetaldehyde recovery rate are improved.

Methods for coating electrodes, particularly anodes, more particularly lithium anodes in batteries. The coating material obtained by the methods, involves the ring-opening polymerization of dioxolane (DOL) monomers in presence of suitable polymerization initiators, crosslinkers and optional further additives. The so-obtained coating material displays advantageous features such as fast lithium ions diffusion and high conductivity, high elastic modulus blocking dendrite formation, high flexibility, scalability, controllable thickness of the coating material and homogeneity on the anode surface. The corresponding electrochemical cells and / or batteries comprising the coating material, are characterized by improved stability during the cell / battery cycling.

The present application relates to a kind of preparation methods of R-(+)-2,2-dimethyl-1,3-dioxolane-4-formaldehyde, belong to the technical field of pharmaceutical intermediates synthesis.In order to solve the existing wastewater pollution and the problem of low selectivity, provide a kind of preparation method of R-(+)-2,2-dimethyl-1,3-dioxolane-4-formaldehyde, the method includes the action of catalytic amount of phase transfer catalyst quaternary ammonium salt and oxidant, the oxidant is selected from PCC or BPCC, in halogenated alkane solvent, substrate formula II compound double ketone-D-mannitol is converted into product formula I compound R-(+)-2,2-dimethyl-1,3-dioxolane-4-formaldehyde by catalytic oxidation reaction.The present application has the effect of high product yield and purity quality, product yield reaches more than 95%, purity reaches more than 99.5%, also greatly reduces the generation of a large amount of wastewater, the advantage of environment-friendly.

The application discloses a kind of in-situ gel preparation methods, belong to lithium metal battery technical field.The method introduces trace initiator to make 1,3-dioxolane DOL in electrolyte occur ring-opening polymerization reaction, by forming DOL crosslinking in advance, realize liquid ether-based electrolyte in-situ solidification on the surface of lithium negative electrode.After forming gel phase, inject electrolyte in soft pack battery of gel phase, construct gel phase@liquid phase two-phase system.By controlling the ratio of electrolyte and poly-DOL, realize the gradient solidification of ether-based electrolyte in battery, adjust the mechanical properties of gel electrolyte.There is intermolecular interaction between poly-DOL and lithium salt anion, significantly improve the ionic conductivity and lithium ion transference number of gel electrolyte, the in-situ gel phase formed has good interface compatibility with lithium negative electrode, and the growth of lithium dendrite is inhibited.This in-situ gel preparation method is low in cost and easy to operate, and is a simple method to realize high capacity and high cycle stability of lithium metal battery.

The invention provides a synthesis method of a quaternary cycloalkane modified O-glucoside compound shown in formula 3, in the presence of a catalyst, a sugar compound shown in formula 1 with exposed hydroxyl and a quaternary tension ring substrate compound shown in formula 2 are subjected to nucleophilic addition reaction in an organic solvent to prepare the quaternary cycloalkane modified O-glucoside compound shown in formula 3: X is H, CF3 or Cl; a is a dioxolane type compound or a pyran type compound; the catalyst is phosphazene base P4-t-Bu, and the specific structural formula is shown in the specification.

An in-situ polymerization dioxolane polymer solid electrolyte, a fluorinated magnesium interface layer, a battery and a preparation method thereof, 1,3-dioxolane, lithium salt and magnesium-containing montmorillonite are uniformly mixed to obtain a mixed solution, then the mixed solution is immersed into a support, matched with a lithium metal negative electrode and a positive electrode to assemble a full battery, and placed for a period of time, and a polymerized dioxolane composite polymer solid electrolyte is prepared through an in-situ polymerization reaction. The magnesium ions spontaneously aggregated on the surface of the montmorillonite compete with the lithium salt anions for coordination, regulate the coordination environment of lithium ions in the electrolyte, increase the number of free lithium ions, and thus improve the ionic conductivity of the electrolyte. In addition, the magnesium ions and the lithium salt anion ligands decompose at the positive and negative electrode interface to participate in the formation of the interface layer, producing an inorganic component-rich interface layer (CEI and SEI) containing fluorinated magnesium, which has a high Young's modulus and fast lithium ion transport kinetics, is beneficial to the rapid transport of lithium ions and improves the stability of the electrolyte and the positive and negative electrode interface, and thus has a good application prospect.

The invention provides an organic-inorganic hybrid solid-state polymer electrolyte coated high-nickel positive electrode material as well as a preparation method and application thereof, and relates to the technical field of all-solid-state lithium batteries. The high-nickel positive electrode material coated with the organic-inorganic hybrid solid polymer electrolyte comprises an inner core and an organic-inorganic hybrid coating layer coated on the surface of the inner core, the inner core is made of a high-nickel positive electrode material; the organic-inorganic hybrid coating layer comprises a ring-opening copolymer of maleic anhydride and 1, 3-dioxolame, and Li3PO4 nanocrystals are embedded into the ring-opening copolymer of maleic anhydride and 1, 3-dioxolame in situ. According to the invention, a flexible and compact coating layer with ionic conductivity is constructed on the surface of the high-nickel positive electrode material, so that the problems of violent interface side reaction, large interface impedance and poor cycling stability existing between the high-nickel positive electrode material and sulfide solid electrolyte are solved; therefore, the electrochemical performance of the material in a sulfide all-solid-state lithium battery is remarkably improved.

The invention belongs to the technical field of photo-curing materials, and particularly relates to a photo-curing adhesive for 3D printing and a preparation method thereof.The photo-curing adhesive for 3D printing is prepared from, by weight, 30-70 parts of isocyanate-group-free polyurethane modified acrylate resin, 30-70 parts of a curing agent, 1-5 parts of a curing agent, 1-5 parts of a curing agent and 1-5 parts of a curing agent. 20 to 40 parts of a bio-based acrylate monomer; 10-30 parts of a low surface tension acrylate monomer; and 1-7 parts of a photoinitiator. According to the invention, the polyurethane acrylate resin synthesized from DOMA (2-oxo-1, 3-dioxolane-4-yl methyl methacrylate) and polyether amine through a non-isocyanate path is adopted, so that the possibility of existence of free isocyanate monomers is thoroughly eliminated from the aspect of molecular design, and the safety in production and use processes is remarkably improved.

The preparation method comprises the following steps: 1, adding tartaric acid, an acid-binding agent and a first organic solvent into a reaction container, uniformly mixing, cooling, dropwise adding a mixed solution of triphosgene and the first solvent into the reaction container under the condition that the temperature does not exceed 10 DEG C, and reacting for 1-2 hours at the temperature of 20-30 DEG C, so as to obtain 5-(methoxycarbonyl)-2-oxo-1, 3-dioxolane-4-methyl formate, namely the 5-(methoxycarbonyl)-2-oxo-1, 3-dioxolane-4-methyl formate, namely the 5-(methoxycarbonyl)-2-oxo-1, 3-dioxolane-4-methyl formate. After dropwise adding, heating to room temperature, stirring, and concentrating filtrate to obtain an intermediate; and 2, adding the intermediate, a second organic solvent, a catalyst and methanol into a reflux reaction container with a water knockout drum and a condenser, carrying out heating reflux reaction to separate water, concentrating the reaction liquid after the reaction is finished to obtain a crude product, adding the crude product into a first organic solvent, carrying out heating reflux, filtering to remove insoluble substances while the crude product is hot, cooling and crystallizing the filtrate, carrying out suction filtration, and drying to obtain the target product. The method has the advantages that the synthesis method is simple and easy to implement, the post-treatment method is easy to operate, and the product is high in purity and good in yield.

The application relates to the technical field of propiconazole synthesis, in particular to a method for synthesizing propiconazole by using ionic liquid catalysis and a solvent-free method, which comprises the following steps: S1, under the condition of room temperature, 1,2,4-triazole sodium or 1,2,4-triazole potassium and 1-4 carbon atom organic alcohol solvent are mixed, a quaternary ammonium salt is added, reflux is carried out for 10 hours, and insoluble substances are removed through filtration; 1-4 carbon atom organic alcohol solvent is removed through distillation, and transparent colorless 1,2,4-triazole-quaternary ammonium ionic liquid is obtained; S2, 2-(2,4-dichlorophenyl)-2-bromomethyl-4-propyl-1,3-dioxolane is mixed with the 1,2,4-triazole-quaternary ammonium ionic liquid, the temperature is increased to 150-160 DEG C, reaction is carried out for 10-15 hours, the temperature is decreased, post-treatment is carried out, and propiconazole with a purity of more than 98% is obtained. The method has the advantages that impurities are reduced, the purity and yield of propiconazole are improved, post-treatment is simple, and wastewater is extremely small, and is a valuable method for industrialization popularization and application.

A negative electrode for an electrochemical cell of a secondary lithium metal battery is manufactured by a method in which a precursor solution is applied to a major surface of a lithium metal substrate to form a protective interfacial layer thereon. The precursor solution includes a first organic solvent mixture, a dioxolane, and a fluorinated organosilane. The protective interfacial layer exhibits a composite structure including a polymeric matrix component and a lithium-containing dispersed component embedded in the polymeric matrix component.

Disclosed are novel fused mescaline derivative compounds, notably substituted ethylamine fused heterocyclic mescaline derivatives, including substituted ethylamine fused dioxolane mescaline derivatives, and pharmaceutical and recreational drug formulations containing the same. Methods of making and using these compounds are also disclosed.

Derivatives of Sabinene (1-isopropyl-4-methylenebicyclo[3.1.0]hexane, CAS No. 3387-41-5), as well as their synthesis and use in organoleptic applications, are described herein. The Sabinene derivatives include a compound having a general Formula (I), wherein --- is a single or a double bond; wherein if --- is a single bond, then Y is selected from the group consisting of CH2R1, CH=C(R2)R3, and (CH2)xCHR3R4; and OR5; wherein if --- is a double bond, then Y is O, N-OMe, or N-OEt; R is selected from the group consisting of H, C(O)-R6, and CH(R6)-OR5; R1 is selected from the group consisting of 1,3-dioxepan, 5-methyl-1,3-dioxolan-4-one, (CH=CH)x(CH2)nOH, (CH=CH)x(CH2)nCHO, CH(CH3)CO2Et, and CH(CH3)OH; R2 = H or Me; R3 is selected from the group consisting of CHO, CO2Et, (CH2)nOH, (CH2)nCHO, (CH2)nCN, and (CH2)nCO2Bu; and R4 is CHO or CH2OH; or R3 and R4 in combination form a dihydropyran, a tetrahydropyran, a tetrahydropyranol, a tetrahydropyranone, a dimethylcyclohexenone, or a dimethylcyclohexenol; R5 is selected from the group consisting of CH(CH3), CH(CH2CH3), C(CH3)CH3, and C(CH3)CH2CH3; R6 is selected from the group consisting of OMe and Me; x is an integer selected from 0 or 1; and n is an integer selected from 2 to 7; with the proviso that when --- is a double bond and Y is O, then R and R6 are not H.

The invention discloses a lithium ion electrolyte and a preparation method thereof as well as a lithium ion battery and a preparation method thereof. The lithium ion electrolyte comprises the following components: a lithium salt with the concentration of 1-1.5 mol / L, a fluoroborate-containing additive with the mass percent of 1-5%, a surfactant with the mass percent of 0.05-1% and the balance of a mixed solvent system, the mixed solvent system comprises tris (2, 2, 2-trifluoroethyl) phosphate, 1, 3-dioxolame and tetrahydrofuran; the preparation method of the lithium ion electrolyte comprises the following steps: preparing a mixed solvent system, adding a lithium salt and stirring; adding a fluoroborate-containing additive and a surfactant, stirring, and filtering; the lithium ion battery comprises a lithium ion electrolyte, a positive plate and a negative plate, the preparation method of the lithium ion battery comprises the following steps: assembling the positive plate, the diaphragm and the negative plate into a battery cell, and injecting the lithium ion electrolyte into the battery cell. The low-temperature discharge performance and the low-temperature cycle performance of the lithium ion battery are improved.

The present invention provides 5-(2-butyl-1,3-dioxolan-2-yl)-1-methylpentyl acetate of the following formula (1). The present invention further provides the aforesaid 5-(2-butyl-1,3-dioxolan-2-yl)-1-methylpentyl acetate (1), the process comprising the step of subjecting an organic magnesium compound (2) of the following general formula (2), wherein X1 represents a halogen atom or a 3-(2-butyl-1,3-dioxolan-2-yl)propyl group, to a nucleophilic addition reaction with propylene oxide of the following formula (3) and then reacting with an acetylating agent of the following general formula (4), wherein X2 represents a halogen atom, an acetoxy group, a methoxy group, or an ethoxy group, to form 5-(2-butyl-1,3-dioxolan-2-yl)-1-methylpentyl acetate (1).

A method for manufacturing solketal ((2,2-Dimethyl-1,3-dioxolan-4-yl)methanol) includes: (1) milling starting reagents, including at least: glycerol, a catalyst selected from a hard Lewis acid including at least one transition metal, and acetone, the molar ratio (glycerol):(acetone) being less than or equal to 0.8; preferably less than or equal to 0.7, at an ambient temperature greater than or equal to 50° C., preferably greater than or equal to 56° C., in a three-dimensional microbead mill in a liquid phase for a residence time less than or equal to 15 minutes, preferably less than or equal to 10 minutes, and in particular less than or equal to 5 minutes; (2) recovering, as output from the mill, a final composition including solketal and, where appropriate, one or more sub-products corresponding to the starting reagents that have not reacted and / or to 1,3-O-isopropylidene-glycerol, and (3) optionally, separating the solketal from the one or more sub-products.

The invention discloses a low-temperature high-ionic-conductivity ether-ester composite sodium ion electrolyte and a preparation method thereof, and belongs to the technical field of energy storage battery materials, the electrolyte comprises ethylene glycol dimethyl ether, ethylene carbonate and methyl ethyl carbonate as basic solvents, and two brand-new modified compounds, namely methyl-2-(2, 2, 3, 3-tetrafluoropropoxy)-1, 2, 3, 4, 4-tetramethyl-1, 3, 4, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4- According to the invention, 2, 3-dioxolane-4-yl phosphonate and cyclo (2-hydroxypropyl-2 '-hydroxyethyl) sulfate are used as auxiliary materials, and fluoroethylene carbonate, sodium bis (fluorosulfonyl) imide and sodium perchlorate are used as auxiliary materials. Wherein the freezing point of fluoroether phosphonate is reduced through a fluorinated chain segment, and a phosphonic acid group promotes ion dissociation and stabilizes an interfacial film; the cyclic hydroxyl sulfonate inhibits molecular association through a cyclic structure, hydroxyl reduces the viscosity of a solvent, and sulfonate groups optimize the conductivity of an interfacial film. The prepared low-temperature high-ionic-conductivity ether-ester composite sodium ion electrolyte is high in ionic conductivity at low temperature, stable in interfacial film and long in cycle life.

An active energy ray-curable composition according to the present disclosure contains the following components (A) and (B).　Component (A): urethane (meth)acrylate polymer having a weight average molecular weight of 20,000 or more and a hydrogenated polybutadiene skeleton. Component B: water-insoluble monofunctional (meth)acrylate having at least one imide group, hydroxyl group, and 1,3-dioxolane ring and having no amide group

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 discloses a full-temperature-range liquid phase temperature swing adsorption process for deep dehydration and impurity removal of dioxolane, which mainly comprises the steps of raw material flow, temperature swing adsorption purification, temperature swing adsorption desorption and rectification concentration. Dioxolame with the purity of 99.9%, the water content of 500-1000 ppm, 100-300 ppm of micromolecular impurity components such as formaldehyde / methanol and the like, and the content of macromolecular impurity components such as ethylene glycol, hemiacetal, paraformaldehyde and the like is greater than or equal to 100 ppm is purified into dioxolame with the purity of greater than or equal to 99.999%, the water content is less than or equal to 100 ppm, the water content is less than or equal to 100 ppm, the water content is less than or equal to 100 ppm, and the water content is less than or equal to 100 ppm. The content of micromolecular impurity components of formaldehyde and methanol is smaller than or equal to 100 ppm, the content of macromolecular impurity components of ethylene glycol, methylal and paraformaldehyde is smaller than 50 ppm, the problems that the purity of products obtained through existing methods such as special rectification, extractive rectification and membrane separation does not reach the standard, and energy consumption and cost are high are solved, the process is simple, import is replaced, and the method is suitable for industrial production. And the quality requirement of the polymer-grade dioxolame required by polyformaldehyde production is met.