498 results about "Propylene carbonate" patented technology

The invention relates to the technical field of batteries, in particular to a battery. Comprising a positive plate and electrolyte, the positive plate comprises a positive current collector and a coating positioned on the surface edge of at least one side of the positive current collector along the length direction; the coating comprises filling particles, and the filling particles comprise at least one of inorganic particles and nitrogen-containing particles; the electrolyte comprises non-fluorinated cyclic carbonate and fluorinated ethyl acetate; the non-fluorinated cyclic carbonate comprises propylene carbonate and optional ethylene carbonate; on the basis of the total mass of the electrolyte, the content ratio C1 of the non-fluorinated cyclic carbonate is smaller than or equal to 25%, the content ratio C11 of the propylene carbonate is 3.1%-24.9%, the content ratio C12 of the ethylene carbonate is 0%-5%, and the content ratio C2 of the fluorinated ethyl acetate is 20.2%-70%. The battery provided by the invention can improve the problem of lithium precipitation under low-temperature discharge, and has relatively good short-circuit safety performance and relatively low high-temperature gas production rate.

The invention provides a secondary battery and electronic equipment, the secondary battery comprises a negative electrode plate and an electrolyte, the negative electrode plate comprises a negative electrode active material layer, the negative electrode active material layer comprises graphite and a silicon carbon material, and the average sphericity of the silicon carbon material is 0.81-0.95; the electrolyte comprises ethylene carbonate, propylene carbonate, ethyl propionate and propyl propionate, based on the mass of the electrolyte, the mass percentage content of ethylene carbonate is a%, the mass percentage content of propylene carbonate is b%, the mass percentage content of ethyl propionate is c%, the mass percentage content of propyl propionate is d%, and the range of (a + b) / (c + d) is 0.23-1.51. According to the invention, the discharge performance and the safety performance of the secondary battery at low temperature can be improved.

The invention provides a lithium secondary battery and an electric device. The lithium secondary battery comprises a positive pole piece, a negative pole piece and an electrolyte, the positive pole piece comprises a positive current collector and a positive film layer arranged on at least one side of the positive current collector, the positive film layer comprises a positive active material, and the positive active material comprises lithium-containing transition metal phosphate particles; the lithium-containing transition metal phosphate particles comprise lithium iron phosphate particles, the lithium iron phosphate particles comprise a doping element Q, and the doping element Q comprises one or more of W, Al, Na, K, Mg, Cu, Mn, Cr, Zn, Pb, Ca, Co, Ni, Sr, Nb, V, Ti, B, S, Si, N, F, Cl, Br and Zr; the electrolyte comprises propylene carbonate and a compound with a formula I, R is selected from halogen, and n is an integer selected from 1-6. The lithium secondary battery provided by the invention has relatively good low-temperature fast-charging performance and also has excellent cycling stability.

The invention discloses preparation and application of an imido covalent organic framework material containing imidazolyl ionic liquid. The imido covalent organic framework material (ILs-TPN-COFs) containing the imidazolyl ionic liquid is obtained by connecting the imidazolyl ionic liquid [CnCmILs (at) Br] to an imido covalent organic framework TPN-COFs through a covalent bond. The material has an ionic liquid tertiary amine N active site and a halogen anion active site, and can promote CO2 activation and ring opening of epoxide. The ILs-TPN-COFs catalytic material has the advantages of uniform distribution of active sites, better stability, easiness in separation of the catalyst from a reaction system, better repeatability and the like. According to the invention, the prepared novel ILs-TPN-COFs material is applied to catalysis of synthesis of propylene carbonate from carbon dioxide and epoxypropane, and shows excellent catalytic performance under mild reaction conditions.

The invention provides a low-temperature electrolyte, positive electrode slurry and a low-temperature sodium ion battery, and belongs to the technical field of battery materials. The low-temperature electrolyte provided by the invention comprises sodium hexafluorophosphate, propylene carbonate, ethylene carbonate, dimethyl carbonate, methyl ethyl carbonate, fluoroethylene carbonate, 2, 2, 3, 4, 4, 4-hexafluorobutyl acrylate and 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether. The battery provided by the invention comprises the low-temperature electrolyte. The low-temperature electrolyte and the low-temperature sodium-ion battery provided by the invention not only can be compatible with a blended positive electrode material, but also can give consideration to low-temperature performance, ensure that the prepared low-temperature sodium-ion battery has good reaction kinetics and cycle performance, and also can improve the energy density of an electrode and reduce the resistivity of powder.

The invention relates to hydrolysis-resistant polyester polyol with high bio-based content, polyurethane resin for a synthetic leather surface layer and a preparation method of the hydrolysis-resistant polyester polyol. The hydrolysis-resistant polyester polyol with high bio-based content comprises the following raw materials: bio-based dihydric alcohol, bio-based dibasic acid, an antioxidant and a catalyst. In the hydrolysis-resistant polyester polyol with high bio-based content, provided by the invention, the bio-based dihydric alcohol not only comprises micromolecular bio-based 1, 3-propylene glycol, but also comprises low-carbon environment-friendly long-chain polypropylene carbonate dihydric alcohol with molecular weight of 1000, so that the crystallinity and hardness of the bio-based polyester polyol are reduced; the hydrolysis resistance and flexibility of the bio-based polyester polyol are improved, the hydrolysis resistance of polyurethane resin for a synthetic leather surface layer prepared from the hydrolysis-resistant polyester polyol with the high bio-based content is synchronously improved, and the stable dispersion performance of pigment is good.

The invention relates to the technical field of lithium ion batteries, and provides a lithium ion battery. The battery comprises a battery cell and a shell, the battery cell comprises an electrode assembly and electrolyte, and the electrode assembly comprises a negative plate, a diaphragm and a positive plate which are stacked in sequence; the mass ratio of the silicon element in the negative electrode active material is a%, and a is greater than or equal to 1 and less than or equal to 50; the shell comprises an aluminum layer and a first polymer layer which is positioned on the side, facing the battery core, of the aluminum layer and comprises a polyolefin material; the thickness of the first current collector of the first pole piece on the outermost side in the cell stacking direction is greater than that of the second current collector of the second pole piece with the same polarity as the first pole piece on the inner side; the thickness of the first current collector is recorded as c [mu] m; the ratio s of c to a satisfies 0.5 < = s < = 20; the electrolyte comprises a cyclic carbonate solvent containing ethylene carbonate and propylene carbonate, and the mass ratio of the cyclic carbonate solvent is smaller than or equal to 40%. The problems of swelling and damage of the packaging material caused by volume change of the silicon negative electrode can be solved, the safety of the battery is improved, and the cycle life of the battery is prolonged.

The invention discloses a semi-solid sodium ion battery and a preparation method thereof. An electrolyte of the semi-solid sodium ion battery is a gel polymer electrolyte formed by formation of an electrolyte solution at 50-80 DEG C, and the electrolyte solution comprises the following components in percentage by weight: 3-20wt% of a fluorine-containing acrylate monomer, 10-20wt% of a fluorine-containing acrylate monomer, 10-20wt% of a fluorine-containing acrylate monomer, 10-20wt% of a fluorine-containing acrylate monomer, 10-20wt% of a fluorine-containing acrylate monomer and the balance of a solvent, 0.01 to 0.1 wt% of an initiator; 10 to 20 weight percent of sodium salt; 2-10 wt% of an additive; and the balance of organic solvent. The organic solvent is ethylene carbonate and propylene carbonate. The fluorine-containing acrylate monomer is adopted in the gel polymer electrolyte, the polymerization degree is high, residues of unsaturated double-bond monomers in the polymer electrolyte are effectively reduced, meanwhile, fluorine free radicals are generated through decomposition under thermal runaway of a battery, the chain type combustion reaction of hydrogen and hydroxyl free radicals in a gas phase is eliminated, and the service life of the battery is prolonged. The flame retardance of the electrolyte is improved, so that the safety of the battery is improved, and the prepared semi-solid sodium-ion battery has relatively good safety and thermal stability.

The invention discloses a carbon dioxide injection and production well cementation cement paste and a preparation method and application thereof, the well cementation cement paste comprises the following components by weight: 95-105 parts of oil well cement, 44-48 parts of water, 4-6 parts of a polymer emulsion, 4-6 parts of a self-repairing material, 1.5-2.5 parts of a drag reducer, 0.5-1.5 parts of a fluid loss agent and 0.2-0.8 part of an antifoaming agent; wherein the polymer emulsion is an emulsion which is formed by taking methyl methacrylate, vinyl trimethoxy silane and propylene carbonate as monomers through polymerization; the self-repairing material is a microcapsule in which thiobacillus ferrooxidans thalli and bacillus amyloliquefaciens thalli are embedded. The well cementation cement paste keeps good strength and relatively low permeability in a carbon dioxide environment, is good in corrosion resistance and has self-repairing capability.

Embodiments described herein relate generally to semi-solid electrodes, and methods of producing the same. In some embodiments, a method of forming a semi-solid electrode can include mixing an active material, a conductive material, and an electrolyte solvent to produce a semi-solid material. The electrolyte solvent is free of electrolyte salt. The method further includes dispensing the semi-solid material onto a current collector and wetting the semi-solid material with an electrolyte solution to form the semi-solid electrode. In some embodiments, the wetting can be via spraying. In some embodiments, the electrolyte salt can have a concentration in the electrolyte solution of at least about 1 M, at least about 2 M, or at least about 3 M. In some embodiments, the solvent can include ethyl methyl carbonate (EMC), ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), gamma-Butyrolactone (GBL), or any combination thereof.

The invention belongs to the technical field of biodegradable high polymer materials, and particularly discloses a PLA / PPC degradable spinning material and a preparation method thereof. The PLA / PPC degradable spinning material is prepared from the following raw materials in parts by weight: 65 to 75 parts of terminated polypropylene carbonate, 15 to 20 parts of polylactic acid, 1 to 2 parts of epoxidized soybean oil, 7 to 10 parts of composite Na-montmorillonite, 3 to 5 parts of light calcium carbonate, 6 to 9 parts of rice straw fiber, 0.6 to 0.8 part of cross-linking agent, 0.2 to 0.5 part of antioxidant, 1 to 2 parts of maleic anhydride grafted PLA compatilizer, 0.07 to 0.01 part of catalyst and 0.3 to 0.5 part of silicone. Various raw materials are mixed, so that the mechanical property of the material is remarkably improved, the material has good strength and toughness, and the comprehensive performance of the material is improved.

The invention relates to the technical field of plastic surface treatment, in particular to an environment-friendly novel plastic brightening cleaning agent formula and a preparation method and application thereof. The formula consists of 25-35% of a high-polarity compound propylene carbonate, 5-15% of a moderate-polarity compound ethyl acetate and 55-65% of a low-polarity compound dimethyl carbonate according to a specific weight ratio, and during preparation, under the protection of nitrogen, the three components are stirred for 20-30 minutes at the temperature of 20-30 DEG C at the speed of 200-400 rpm, and are sealed in an HDPE (High-Density Polyethylene) barrel after being filtered by 0.5 mu m. The bright cleaning agent has low toxicity (VOCsilt; 50 g / L), rapid volatilization (the surface drying time is less than or equal to 3 minutes) and high biodegradability (gt; the sulfate crystals of the lead-acid storage battery shell can be efficiently removed (the wiping removal rate after spraying is gt; and moreover, the glossiness is obviously improved to be more than or equal to 85 GU (an incidence angle of 60 degrees). The method is simple in process, meets the international environmental protection standard (such as GB 38508-2020), is suitable for industrial production and multi-scene application, has efficient cleaning and environmental protection safety, and is suitable for industrial production and multi-scene application.

The invention relates to an electrolyte, a secondary battery and an electronic device. Specifically, the invention provides the electrolyte, the electrolyte comprises propylene carbonate, propyl propionate, butanedinitrile and 1, 3, 6-hexane trinitrile, relative to 100 parts by mass of the electrolyte, the propylene carbonate accounts for 14 to 20 parts by mass, the propyl propionate accounts for 10 to 55 parts by mass, the butanedinitrile accounts for 0.3 to 4 parts by mass, and the 1, 3, 6-hexane trinitrile accounts for 1 to 6 parts by mass; the electrolyte further comprises adiponitrile, and the adiponitrile is 0.05-0.5 part by mass relative to 100 parts by mass of the electrolyte. According to the invention, the low-temperature discharge performance and the over-temperature safety performance of the secondary battery can be improved.

The present invention provides a non-aqueous electrolyte including a lithium salt, an organic solvent, and an additive, wherein the additive includes a compound represented by Formula 1 below and lithium difluoro(oxalato)borate (LiODFB), and the organic solvent includes ethylene carbonate (EC), propylene carbonate (PC), ethylene propionate (EP), and propyl propionate (PP). In Formula 1 above, n is an integer of 3 to 10.

The invention provides a polyurethane composite material, a preparation method and application thereof and an intelligent fabric liner material, and belongs to the field of solid lubrication. The preparation method comprises the following steps: mixing polypropylene carbonate glycol, isophorone diisocyanate, 2, 2-dimethylolpropionic acid and a catalyst, carrying out a prepolymerization reaction, mixing the obtained prepolymer, 4, 4 '-diaminodiphenyl disulfide and 4, 6-diaminopyrimidine, carrying out a chain extension reaction, mixing the obtained chain extension product with triethylamine, and carrying out a polymerization reaction to obtain polyurethane resin; and mixing polyurethane resin, the isocyanate functionalized boron nitride nanosheets and the carbon quantum dots to obtain the polyurethane composite material. According to the invention, an advanced polyurethane composite material is constructed by innovatively combining self-repairing, wear resistance and damage monitoring functions for the first time, and the properties are realized by a design strategy of combining isocyanate functionalized boron nitride nanosheets and carbon quantum dots with multiple dynamic reversible bonds (disulfide bonds and hydrogen bonds).

The invention relates to a preparation method and application of a silicon-based biodegradable essence microcapsule, and the preparation method of the silicon-based biodegradable essence microcapsule comprises the following steps: S1, uniformly mixing oily essence and a silicon-based mesoporous material to obtain an oil phase; dissolving an emulsifier in water to obtain a water phase; s2, mixing the oil phase and the water phase, and homogenizing to obtain an emulsion; and S3, adding a diisocyanate compound and polypropylene carbonate into the emulsion, and carrying out a stirring reaction to obtain the silicon-based biodegradable essence microcapsule. A silicon-based mesoporous material is introduced in the process of preparing the essence microcapsule by taking polypropylene carbonate as a wall material, a synergistic wrapping system of the essence microcapsule is constructed, and the volatile essence is subjected to double-layer protection by utilizing a mode of combining physical adsorption and chemical crosslinking embedding, so that the fragrance retention time of the essence is prolonged, and the fragrance retention time of the essence is prolonged. Meanwhile, the embedding rate of the microcapsule can be effectively improved, and the application of the essence microcapsule in actual production can be promoted by combining the biodegradable characteristic of the polypropylene carbonate.

The invention relates to the technical field of printing materials, in particular to an environment-friendly silk-screen printing ink diluent based on propylene carbonate and dimethyl carbonate, which comprises dimethyl carbonate and propylene carbonate, and the dimethyl carbonate and the propylene carbonate are compounded according to a certain proportion. The diluent further comprises a synergistic solvent and a functional additive which are added according to a certain proportion. The environment-friendly silk-screen printing ink diluent formula for silk-screen printing ink and the preparation method of the environment-friendly silk-screen printing ink diluent formula are particularly suitable for viscosity adjustment and printability optimization of solvent type oil black, have the characteristics of low volatility and high solubility, and solve the problems of high toxicity of a traditional solvent, poor stability of a compound system, insufficient printability and the like.

The invention provides a lithium secondary battery and a power utilization device. The lithium secondary battery comprises a positive electrode piece, a negative electrode piece and electrolyte, the negative electrode piece comprises a negative electrode current collector and a negative electrode film layer arranged on at least one side of the negative electrode current collector, the negative electrode film layer comprises a negative electrode active material, and the specific surface area a of the negative electrode active material is greater than or equal to 2m < 2 > / g and less than or equal to 5m < 2 > / g; the electrolyte comprises propylene carbonate, a first additive and a compound with a formula I, R is selected from halogen, n is an integer selected from 1-6, and the first additive comprises at least one of ethylene sulfate, vinylene carbonate, fluoroethylene carbonate, 1, 3-propane sultone, 1, 3-propene sultone, tetravinyl silane or methylene methanedisulfonate. The lithium secondary battery provided by the invention has relatively good low-temperature quick charge performance and also has cycle performance.

The invention belongs to the technical field of optical glass. The invention relates to an electrochromic glass device, in particular to a preparation method of the electrochromic glass device. The preparation method comprises the following specific preparation steps: cleaning the surface of a glass substrate, and depositing an indium tin oxide transparent conductive layer on the surface of the glass substrate by adopting magnetron sputtering; the preparation method comprises the following steps: by taking nano spherical silicon dioxide as a template, dispersing the nano spherical silicon dioxide in an ethanol solution, then adding a sodium tungstate solution, then adjusting the pH value to 2-3, carrying out a stirring reaction, and then cleaning with a sodium hydroxide solution to remove the template so as to obtain a hollow spherical precursor dispersion liquid; coating the hollow spherical precursor dispersion liquid on the surface of the transparent conductive layer in a spin coating mode, drying and annealing; preparing a liquid electrolyte: taking propylene carbonate as a solvent, and taking lithium perchlorate as an electrolyte lithium salt; niO is deposited on the surface of the WO3 electrochromic layer to serve as a counter electrode through magnetron sputtering; epoxy resin is adopted to package the edge, after liquid electrolyte is injected, internal residual bubbles are removed through hot pressing, and the product is obtained.

The invention relates to the technical field of lithium battery electrolyte, in particular to a composite enhanced solid electrolyte membrane and a preparation method thereof. The polymer solid electrolyte is a polycarbonate-based solid electrolyte such as a poly (ethylene carbonate)-based solid electrolyte PVC, a poly (vinylene carbonate)-based solid electrolyte PEC, a poly (propylene carbonate)-based solid electrolyte PPC, a poly (propylene carbonate)-based solid electrolyte PTMC and a polyoxyethylene-based solid electrolyte. The electrolyte is one or more of polysiloxane-based polymer electrolyte and single-lithium-ion conductive polymer electrolyte materials. The composite enhanced solid electrolyte membrane is disclosed. The preparation method comprises the following steps: preparing the three-dimensional nanofiber skeleton through electrostatic spinning, loading the two surfaces of mixed slurry of the polymer electrolyte and the lithium salt on the base membrane in an inert atmosphere, and carrying out vacuum curing molding. The composite membrane has high safety and a wide electrochemical window, the process of the composite membrane is compatible with an existing lithium battery production line, the raw material cost is controllable, and the composite membrane has large-scale commercial application potential.

The invention discloses a non-selective sodium-ion battery electrolyte suitable for low temperature and a preparation method thereof, and relates to the field of batteries, and the sodium-ion battery electrolyte is composed of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, vinylene carbonate and sodium hexafluorophosphate. The sodium ion battery low-temperature electrolyte with uniform components is obtained by regulating and controlling the proportion of the basic components and mixing the basic components with the additive with proper content, the freezing point of the electrolyte is reduced, the capacity retention ratio of the battery at low temperature is improved, and a new thought is expected to be provided for widening the low-temperature application scene of the sodium ion battery.

The invention belongs to the field of modification of degradable fat polycarbonate materials, and particularly relates to a PCHC / PPC composite material and a preparation method thereof. A PCHC matrix material is added into PPC for blending modification, a PCHC / PPC blended matrix material is obtained, hydrophobic microcrystalline cellulose is further added, and the PCHC / PPC composite material is obtained. The invention aims to break through the limitation of an existing degradable material in specific application, the performance of a polypropylene carbonate PPC material is better improved through a layer-by-layer progressive optimization strategy, and a novel polycarbonate composite material is obtained, so that the thermal stability and the mechanical property of the material are improved, and wider application requirements are met.

Disclosed herein is an electrolyte solution comprising: (a) about 5 wt % to about 60 wt % of a fluorinated ester; (b) greater than 0 wt % to less than 100 wt % of at least one solvent selected from fluoroethylene carbonate, difluoroethylene carbonate, ethyl methyl carbonate, dimethyl carbonate, diethyl carbonate, methyl (2,2,2-trifluoroethyl) carbonate, propylene carbonate, trifluoropropylene carbonate, butylene carbonate, methyl acetate (MA), ethyl acetate (EA), methyl propanoate (MP); (c) at least one salt; wherein the wt % is calculated based on a total weight of a) and b); and wherein the electrolyte solution is substantially free of ethylene carbonate (EC). Also disclosed are batteries comprising such electrolytes. Also disclosed are methods of making the disclosed herein electrolytes and batteries.

The invention relates to the technical field of preparation of propylene carbonate, and discloses a solid bifunctional catalyst as well as a preparation method and application thereof. The solid bifunctional catalyst comprises a titanium silicalite molecular sieve and alkaline earth metal oxide loaded on the titanium silicalite molecular sieve. By adopting the solid bifunctional catalyst, propylene carbonate can be directly and continuously synthesized from propylene, an oxidizing agent and CO2 through one-step reaction. The technical process is obviously simplified, the links of separation, purification, storage and transportation of epoxypropane are cancelled, and the production efficiency is improved through continuous production; the process energy consumption is obviously reduced, and the economical efficiency of the whole process is improved.

The invention discloses a preparation method of a piezoelectric response type hybrid ceramic membrane, which is characterized in that polyvinylidene fluoride powder is used as a base material of the membrane, propylene carbonate or ethylene carbonate is used as a diluent, negative-voltage-loaded piezoelectric ceramic modified nanoparticles are doped, and a proper amount of inorganic piezoelectric nanoparticles are doped, so that the electrical property of the pressed membrane is remarkably improved; a negative charge group introduced to the surface of the membrane through surface grafting is combined, so that the relative content of beta crystal forms of the polyvinylidene fluoride membrane is increased, and finally efficient interception and excellent anti-pollution effects on humic acid are achieved.

The invention discloses a benzene-free environment-friendly plastic printing ink diluent and a preparation method thereof, and relates to the field of chemical engineering. The environment-friendly flame retardant is prepared from the following components in parts by weight: 10 to 25 parts of ethyl acetate, 8 to 15 parts of refined methyl acetate, 5 to 10 parts of butyl acetate, 10 to 30 parts of dimethyl carbonate, 6 to 15 parts of methylal, 10 to 20 parts of propyl acetate, 2 to 7 parts of dibasic acid ester, 3 to 10 parts of propylene glycol monomethyl ether, 7 to 15 parts of isopropanol and 3 to 9 parts of propylene carbonate. According to the present invention, the ethyl acetate, the dimethyl carbonate and other benzene-free solvents are adopted to replace the traditional benzene-series solvent, such that the benzene-free environmental protection target is achieved, the environmental residue and the human health risk are substantially reduced, in addition, the propylene carbonate, the dibasic acid ester and the like in the formula further have the biodegradability, the environmental protection performance of the diluent is further improved, and the environmental protection performance of the diluent is further improved. The cost of the prepared benzene-free environment-friendly plastic printing ink diluent is remarkably reduced compared with that of an imported diluent.

The invention relates to the technical field of electrolyte preparation, and discloses a lithium ion battery electrolyte capable of ensuring low-temperature discharge characteristic, which comprises the following components in percentage by mass: 25% of propylene carbonate (PC), 35% of dimethyl carbonate (DMC), 20% of gamma-butyrolactone (GBL), 20% of ethyl acetate, 1.0 mol / L of lithium salt bis (trifluoromethanesulfonimide) (LiTFSI), 3% of additive 1, 3-propane sultone (PS) (mass fraction: 0.1% of sodium hydroxide (mass fraction: 0.1% of sodium hydroxide), and the balance of water. According to the present invention, the low temperature performance of the solution is improved, the unique solvent formula and the unique solvent ratio enable the electrolyte to have good fluidity in the low temperature environment, and the freezing point of the electrolyte is effectively reduced so as to ensure that the lithium ions can smoothly migrate between the electrodes at the low temperature, such that the lithium ion battery performance is improved, and the lithium ion battery performance is improved. The discharge performance of the battery under a low-temperature condition is obviously improved, and the application scene of the lithium ion battery is expanded.

The present invention discloses a recyclable bio-based thermosetting polyurethane hot melt adhesive and its preparation method, which includes vegetable oil polyol, poly(propylene carbonate) diol, polyester polyol, macromolecular thermoplastic tackifying resin, isocyanate, furan compound containing active hydrogen, and bifunctional bismaleimide. First, the present invention reacts vegetable oil polyol, poly(propylene carbonate) diol, polyester polyol, and macromolecular thermoplastic tackifying resin with diisocyanate to generate a polyurethane prepolymer. Subsequently, the furan compound containing active hydrogen is reacted with the above prepolymer. Finally, bifunctional bismaleimide is added to form a dynamic covalent polymer therewith. The prepared bio-based thermosetting polyurethane hot melt adhesive has a low melt viscosity, a high ultimate peel strength, and recyclable characteristics. Some raw materials of the present invention are derived from biomass and renewable materials, which improves the green sustainability of the product's entire life cycle.

The invention belongs to the technical field of secondary batteries, and particularly relates to an electrolyte and a preparation method thereof and a secondary battery, the electrolyte comprises an organic solvent, a lithium salt and an additive, the mass of the organic solvent accounts for 80-93% of the total mass of the electrolyte, and the mass of the lithium salt accounts for 6-15% of the total mass of the electrolyte. The mass of the additive accounts for 1-8% of the total mass of the electrolyte; wherein the organic solvent comprises a linear carbonic ester solvent and a cyclic carbonic ester solvent, the mass of the linear carbonic ester solvent accounts for 60%-85% of the total mass of the organic solvent, and the mass of the cyclic carbonic ester solvent accounts for 15%-40% of the total mass of the organic solvent. Compared with the prior art, the electrolyte provided by the invention has the advantages that the low-temperature performance of the battery can be remarkably improved under the condition that a large amount of propylene carbonate, methyl ethyl carbonate, carboxylic ester solvents and low-temperature additives are not required to be used by precisely regulating and controlling the mass ratio of the organic solvent to the lithium salt to the additives in the electrolyte.

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.