559 results about "Ethylene carbonate" patented technology

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, and the electrode assembly comprises a positive pole piece and a negative pole piece; the positive pole piece comprises a positive pole current collecting part and a positive pole film layer; the positive pole film layer comprises lithium-containing phosphate with an olivine structure; the negative pole piece comprises a negative pole current collecting part and a negative pole film layer, and the negative pole film layer comprises a carbon-based material; the electrolyte comprises a carboxylic ester solvent, a first additive and fluorine-containing lithium sulfimide, and the mass content of the carboxylic ester solvent is 8%-60%; the total mass content of the first additive is 2.5%-10%, the first additive comprises 1, 3-propane sultone with the mass content larger than or equal to 0, an ethylene carbonate derivative with the mass content larger than or equal to 0 and vinylene carbonate with the mass content larger than 0, and the ethylene carbonate derivative comprises a compound shown in the formula A; the mass content of the fluorine-containing lithium sulfimide is 4%-8%. According to the invention, the rapid charging performance and the cycle performance of the battery monomer can be improved. # imgabs0 # formula A

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, and the electrode assembly comprises a positive pole piece and a negative pole piece; the positive pole piece comprises lithium-containing phosphate with an olivine structure; the negative pole piece comprises graphite particles; the electrolyte comprises a carboxylic ester solvent and a first additive, the thickness of the single-side negative electrode film layer is 50 microns to 75 microns, and the volume average particle size of the graphite particles is 8.5 microns to 13.5 microns; based on the mass of the electrolyte, the mass content of the carboxylic ester solvent is 8%-60%, the total mass content of the first additive is 3%-10%, the first additive comprises 1, 3-propane sultone with the mass content larger than or equal to 0, an ethylene carbonate derivative with the mass content larger than or equal to 0 and vinylene carbonate with the mass content larger than or equal to 3%, and the ethylene carbonate derivative comprises a compound shown in the formula A. According to the invention, the rapid charging performance and the cycle performance of the battery monomer under high energy density can be improved. # imgabs0 # formula A

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 relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, the electrode assembly comprises a positive pole piece, the positive pole piece comprises a positive active material layer, and the positive active material layer comprises lithium-containing phosphate of an olivine structure; the electrolyte comprises, by mass, 8-30% of a carboxylic ester solvent, a lithium salt and an unsaturated ester additive, the lithium salt comprises lithium hexafluorophosphate and fluorine-containing lithium sulfimide, the mass content of the fluorine-containing lithium sulfimide in the lithium salt is 18-45%, the mass content of the unsaturated ester additive in the electrolyte is 0.05-5%, and the mass content of the unsaturated ester additive in the electrolyte is 0.05-5%. The unsaturated ester additive comprises one or more of vinylene carbonate, vinylethylene carbonate, allyl ethyl carbonate and a fluoro-carbonate additive; the amount of electrolyte in the battery cell is 2.8 g / Ah to 3.2 g / Ah. According to the invention, rapid charging and use reliability of the single battery can be considered.

Secondary battery, including a positive electrode sheet comprising a positive electrode current collector and a positive electrode film layer, wherein the positive electrode film layer is arranged on at least one side of the positive electrode current collector and the positive electrode film layer comprises a positive electrode active material; a negative electrode sheet, wherein the negative electrode sheet comprises a negative electrode current collector and a negative electrode film layer, wherein the negative electrode film layer is arranged on at least one side of the negative electrode current collector and the negative electrode film layer comprises a negative electrode active material, wherein the negative electrode active material comprises graphite and the powder compaction density of the negative electrode active material at 20,000 N is 1.5 g / cm³ 3 up to 1.85 g / cm³ 3 is; and an electrolyte comprising an organic solvent and an organic additive, wherein the organic solvent comprises a first solvent, the first solvent comprising cyclic carbonate, and the mass fraction of the first solvent, based on the total mass of the electrolyte, is 17% to 34%; wherein the organic additive comprises a first and a second additive, the first additive comprising vinylene carbonate and the second additive comprising an ethylene carbonate derivative, and the mass fraction of the first additive is 1.5% to 8% and the mass fraction of the second additive is 0.5% to 4%, each based on the total mass of the electrolyte.

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 provides a system and a method for producing high-purity electronic-grade carbonic ester, and the system comprises a heterogeneous reaction section, a separation section and a crystallization section along the material flow direction, the heterogeneous reaction section is used for carrying out heterogeneous reaction on ethylene oxide and carbon dioxide to prepare carbonic ester; the separation section is used for separating materials from the heterogeneous reaction section and comprises a flash evaporation unit and a rectification unit in the material flow direction, and the flash evaporation unit comprises at least one flash evaporation tank; the rectification unit comprises at least one rectification tower, and the side-draw of the rectification unit is communicated with the feed port of the crystallization section; and the crystallization section is used for crystallizing and purifying the material mainly containing carbonic ester from the separation section. According to the method, high-purity ethylene carbonate used as a power battery can be obtained from the crystallization section, and crystallization mother liquor can be selectively returned to the separation section to be concentrated. The method can effectively improve product purity, reduce product chromaticity and reduce energy consumption, and can be applied to industrial production of carbonic ester.

This invention discloses a method for catalytically depolymerizing polyethylene terephthalate (PET) to prepare terephthalate. Under catalyst-free conditions or with a salt as a catalyst, PET or its composite system is treated in diester carbonate to achieve chemical depolymerization of PET, yielding PET monomers terephthalate and ethylene carbonate, and achieving complete depolymerization of PET in the composite. This invention, through the reaction of diester carbonate with PET, enables the depolymerization of PET under mild conditions, and further facilitates the research and development of related technologies for the chemical recovery of PET monomers from PET composite or mixed systems. The method provided by this invention has advantages such as high efficiency, environmental friendliness, and mild reaction conditions, and can catalyze the depolymerization of PET to generate its monomer terephthalate, possessing strong industrial application value.

The invention relates to an in-situ curing gel structure electrolyte as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing a resin matrix with a pore-forming agent, then adding a curing agent for mixing to obtain a mixed solution, and pouring the mixed solution into a closed mold for curing to obtain a resin film; soaking and drying the resin film to obtain porous resin; and (2) mixing 4-styrene sulfonyl (phenylsulfonyl) imide lithium salt, polyethylene glycol methyl ether acrylate, polyethylene glycol dimethacrylate, ethylene carbonate and azodiisobutyronitrile to prepare a mixed solution, and soaking the porous resin in the mixed solution to react and cure, thereby obtaining the in-situ curing gel structure electrolyte. The preparation method is simple, and the prepared in-situ curing gel structure electrolyte can improve the mechanical property, the battery capacity and the cycle performance of the in-situ curing gel structure electrolyte.

The invention discloses a battery monomer, a battery device and a power utilization device. A positive active material of a positive pole piece of the battery monomer comprises lithium-containing phosphate with an olivine structure, and the single-side coating weight of a positive film layer is 180mg / 1540.25 mm < 2 > to 380mg / 1540.25 mm < 2 >; the negative pole piece comprises a negative pole film layer, the negative pole film layer comprises a negative pole active material, the negative pole active material comprises a silicon-based material, and based on the mass of the negative pole active material, the mass content of the silicon element is 0.3%-10.0%; the electrolyte comprises a first additive, the first additive comprises at least one of vinylene carbonate and an ethylene carbonate derivative, the mass content of the first additive is 1%-12% based on the total mass of the electrolyte, and the compaction density of the positive electrode film layer is 2.50 g / cm < 3 >-2.80 g / cm < 3 > when the battery monomer is in a 100% state of charge.

The invention belongs to the technical field of chemical production, and particularly relates to high-purity dimethyl carbonate and a preparation method thereof. The preparation method comprises the following steps: taking ethylene carbonate and methanol as raw materials, taking an alkali alcohol solution as a catalyst, carrying out transesterification in a rectifying tower to obtain dimethyl carbonate and methanol azeotrope, and extracting the azeotrope from the top of the rectifying tower; separating the dimethyl carbonate and methanol azeotrope by adopting pressurized azeotropic distillation to obtain a dimethyl carbonate crude product; and conveying the dimethyl carbonate crude product into a falling film crystallizer for continuous falling film crystallization, controlling the temperature of low-temperature chilled water in the falling film crystallizer to be-10 to 2 DEG C and the circulating material amount to be 3-5 times of the mass of the product required to be produced, and heating to melt the material to obtain the high-purity dimethyl carbonate product. According to the preparation method provided by the invention, rectification crude purification and continuous falling film crystallization processes are adopted, and dimethyl carbonate with the purity of 99.99% or above is obtained.

The invention relates to a battery monomer, a battery device and a power utilization device. The battery monomer comprises a positive pole piece and a negative pole piece, the positive pole piece comprises lithium-containing phosphate; the negative pole piece comprises graphite particles; the electrolyte comprises a carboxylic ester solvent, a linear carbonic ester solvent and an additive, the mass content of the carboxylic ester solvent is 10%-30%, and the mass content of the linear carbonic ester solvent is 10%-50%; the mass content of the additive is 3%-9%, the additive comprises 1, 3-propane sultone with the mass content larger than or equal to 0, an ethylene carbonate derivative with the mass content larger than or equal to 0 and vinylene carbonate with the mass content larger than 0, and the ethylene carbonate derivative comprises a compound shown in the formula A; q1, Q2, Q3 and Q4 each independently comprise any one of a hydrogen atom, a halogen atom, a C1 to C5 alkyl group or a C1 to C5 halogenated alkyl group, and Q1, Q2, Q3 and Q4 are not hydrogen atoms at the same time. # imgabs0 # formula A is shown in the specification.

The invention relates to the technical field of bentonite anti-seepage materials, and particularly discloses a pre-hydrated bentonite anti-seepage material and a preparation process thereof. The modified bentonite is prepared by mixing the following raw materials in parts by mass: 80-90 parts of calcium bentonite, 10-12 parts of a binder, 5-8 parts of an organic composite component and 3-5 parts of ethylene carbonate, the preparation method comprises the following steps: taking calcium bentonite, crushing, sieving, adding water for dispersing, adjusting the pH value, adding ethylene carbonate, heating and stirring, adding the organic composite component, continuously treating, filtering, taking a solid part, adding a binder, mixing, laminating, carrying out mold pressing treatment, and cooling, thereby obtaining the product. Wherein the organic composite component is obtained by amino-terminated modification of acylated polyethylene glycol. The water absorption rate of the pre-hydrated bentonite anti-seepage material prepared by the preparation process is greater than or equal to 5.2, the water retention rate is greater than or equal to 63.7%, and the elution risk of intercalator micromolecules can be greatly reduced.

The embodiment of the invention relates to a method for initiating in-situ polymerization of an electrolyte solution through electrochemical induction. A solvent of the electrolyte solution comprises cyclic ether molecules and halogen atom substituted ethylene carbonate molecules; the method comprises the following steps: carrying out constant-current charging on a battery to a set voltage, and carrying out constant-voltage charging for a specific time under the set voltage, so that halogen atoms of halogen atom substituted ethylene carbonate molecules are removed under the reduction potential of the negative electrode side of the battery to generate free radical sites, two molecular structures after halogen atoms are removed are mutually combined through the free radical sites to form a dimer, the dimer is migrated to the positive electrode side in an electrolyte solution, dehydrogenation reaction is carried out under the action of oxidation potential applied to the positive electrode side, and in-situ ring-opening polymerization reaction of cyclic ether molecules is initiated through removed hydrogen ions; therefore, in-situ polymerization solidification of the electrolyte solution is realized under the condition that a conventional initiator is not contained.

The invention relates to the technical field of modified polyurethane preparation, in particular to a modified rigid polyurethane foam material and a preparation method thereof.The material is specifically prepared from CO2-based polyol, polyether, deionized water, a foaming agent, a catalyst, a foam stabilizer and isocyanate. Wherein CO2-based polyol is introduced into original polyether polyol, specifically, poly (ethylene carbonate) polyol is added, so that the heat conductivity coefficient of the material can be reduced, the compression strength of the material can be improved, and the low-cost and high-performance polyurethane foam can be prepared. The finally prepared rigid polyurethane foam material has the characteristics of good heat insulation property and high pressure resistance; and the whole preparation process is simple, the whole cost is low, and the market competitiveness is high.

The invention relates to a lithium ion battery. In order to solve the problem that the performance of the battery is influenced by solvent decomposition and gas production due to the fact that active oxygen is released in the using process when a lithium supplementing agent is added, a solvent ethylene carbonate in an electrolyte is promoted to be subjected to a ring-opening reaction, and the lithium ion battery comprises a positive electrode, a negative electrode, a diaphragm and the electrolyte, the positive electrode comprises a positive electrode active material and a lithium supplement agent, the electrolyte comprises an organic solvent, a lithium salt and an additive, the organic solvent comprises fluoro carboxylic ester, fluoro ether and carbonic ester and does not contain ethylene carbonate, and the additive comprises trimethylsiloxyethyl isocyanate and / or 2-(1, 1-thiophane-3-dioxide)-2, 2-methyl difluoroacetate. Through the synergistic effect of the solvent system and the additive, the stability of the electrolyte in a battery containing a lithium supplement agent is improved, the wettability and low-temperature performance of the battery, especially a high-compaction battery, are improved, and meanwhile, the lithium ion battery has relatively good normal-temperature cycle performance and high-temperature performance.

The invention provides a secondary battery and an electric device. The secondary battery comprises a negative electrode plate and a non-aqueous electrolyte, the negative electrode plate comprises a negative electrode active material, the volume average particle size Dv50 of the negative electrode active material is 6-20 [mu] m, the non-aqueous electrolyte comprises an additive and a non-aqueous solvent, and the additive comprises a cyclic sulfate compound represented by formula (I); the non-aqueous solvent comprises ethylene carbonate; # imgabs0 #

The invention relates to the technical field of lithium ion battery electrolytes, and discloses a low-temperature electrolyte for a lithium ion battery, the lithium ion battery and application of the lithium ion battery. The low-temperature electrolyte for the lithium ion battery is characterized by comprising a lithium salt, an organic solvent, a film-forming additive and a functional additive, according to the volume percentage, the organic solvent accounts for 85%-96%, the film-forming additive accounts for 3%-10%, and the functional additive accounts for 1%-5%. The organic solvent is linear carboxylic ester. In the low-temperature electrolyte for the lithium ion battery, both the linear carboxylic ester and the halogenated linear carboxylic ester contain C = O polar groups, have relatively high dielectric constants and can effectively dissolve lithium salt, so that the electrolyte keeps high ionic conductivity; halogenated linear carboxylic ester is decomposed prior to linear carboxylic ester, and an SEI film rich in lithium halide is formed on the surface of the negative electrode. Compared with an ethylene carbonate-based electrolyte, the lithium halide-rich SEI film formed by the electrolyte provided by the invention is low in impedance, rapid ion transmission is facilitated, and the low-temperature charge-discharge performance of the battery is remarkably improved.

The invention discloses a lithium manganese iron phosphate secondary battery and device, and relates to the technical field of lithium manganese iron phosphate batteries. The lithium manganese iron phosphate secondary battery comprises an electrolyte and a positive pole piece, wherein the positive pole piece comprises a lithium manganese iron phosphate positive pole material; the electrolyte comprises an additive and an organic solvent, the additive comprises vinylene carbonate, and the mass of the vinylene carbonate accounts for 0.8%-1.7% of the total mass of the electrolyte; the organic solvent comprises ethylene carbonate, and the mass of the ethylene carbonate is 10-19% of the total mass of the electrolyte; the mass content of the fluorine element in the electrolyte is 7.5%-12.75%; the mass content of fluoroethylene carbonate in the electrolyte is less than 10 ppm, and the mass content of boron is less than 10 ppm. According to the invention, the contents of vinylene carbonate, ethylene carbonate and total fluorine element in the electrolyte are accurately controlled, and meanwhile, the contents of fluoroethylene carbonate and boron element are strictly limited to be less than a preset threshold value, so that the dissolution of manganese ions is effectively inhibited, and the cycle life of the battery at high voltage and high temperature is remarkably prolonged.

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 degradable and high-barrier modified plastics, and particularly relates to an environment-friendly, high-oxygen-barrier and water-resistant modified plastic, a plastic alloy and a functional product of the environment-friendly, high-oxygen-barrier and water-resistant modified plastic and the plastic alloy. According to the material, polyvinyl alcohol is used as a main component and is blended with auxiliaries such as a plasticizer and a cross-linking agent through a twin-screw melt extrusion technology, and modified plastic (HB-PVOH) with excellent barrier property, water resistance and mechanical property is formed. In order to further enhance the performance, the HB-PVOH can be co-extruded with polymers such as polyhydroxyalkanoate, polymethyl ethylene carbonate, polylactic acid, poly (butylene succinate) and the like to prepare binary or ternary plastic alloy. The material can be widely applied to the fields of high-end packaging, oxygen barrier coatings, environment-friendly packaging and the like, plastic or paper-plastic composite products are prepared through a multi-layer co-extrusion-film blowing, curtain coating or film spraying technology, the sustainable development trend of aluminum reduction, plastic reduction and fluorine reduction is met, and the material is a green packaging solution which is high in cost performance, environmentally friendly and practical.

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 provides a method for synthesizing monochloroethylene carbonate. The method provided by the invention is beneficial to improving the utilization rate of raw materials and the reaction efficiency. The method is carried out according to a first scheme or a second scheme, and the first scheme comprises the following steps: (1a) carbon tetrachloride is used as a solvent, chlorine and ethylene carbonate are subjected to a chlorination reaction, and the chlorination reaction is carried out under the condition that feed liquid in a chlorination kettle is in a boiling state; (2a) enabling a gas-phase material flow generated in the chlorination kettle to enter a rectifying tower to be in countercurrent contact with a carbon tetrachloride stream; the scheme II comprises the following steps: (1b) mixing ethylene carbonate and chlorine in a pre-reactor to carry out partial chlorination reaction; (2b) carrying out a chlorination reaction on the pre-reaction feed liquid and supplemented chlorine in a chlorination kettle in the presence of carbon tetrachloride, wherein the chlorination reaction is carried out under the condition that the feed liquid in the chlorination kettle is in a boiling state under a reduced pressure condition; and (3b) enabling a gas-phase material flow generated in the chlorination kettle to enter a rectifying tower to be in countercurrent contact with the carbon tetrachloride flow.

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).

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 provides a preparation method of ethylene carbonate and ethylene sulfate, which comprises the following steps: 1) by taking vinylethylene carbonate as a raw material, carrying out oxidation reaction with an oxidant to obtain epoxy ethylene carbonate as shown in a formula I; and 2) carrying out heating reaction on the epoxy ethylene carbonate as shown in the formula I obtained in the step 1) and sulfamic acid in an acidic solvent to obtain ethylene carbonate disulfate as shown in a formula II. The method avoids the problem of poor reaction selectivity caused by using butantetraol as a raw material in the prior art; according to the method disclosed by the invention, an intermediate butantetraol carbonate is not generated, so that the problem that the intermediate further reacts to generate a byproduct 2, 4, 7-trioxa-3-oxy-bicyclo [3.3. 0] octane does not exist; in addition, when the final product sulfate is synthesized, mild and non-irritant sulfamic acid is used, and the method has the advantages of being clean, green and environmentally friendly.

The invention provides a method for producing monochloroethylene carbonate with low ethylene carbonate content, and the monochloroethylene carbonate prepared by the method provided by the invention can improve the production efficiency and yield, and can significantly reduce the EC content in a CEC product at the same time. The method comprises the following steps: (1) in a main reactor, chlorine is introduced into a material at least containing an ethylene carbonate liquid to carry out a chlorination reaction in a boiling state, and the reaction pressure of the chlorination reaction is lower than normal pressure; and (2) feeding a gas-phase material flow obtained in the main reactor into a rectifying tower for separation, and obtaining a gas-phase product from the top of the rectifying tower.

The invention relates to a method and a system for preparing chloroethylene carbonate through continuous photochlorination. The system aims at solving the three technical problems that the mass transfer efficiency of chlorine is low under the high gas-liquid ratio, reaction balance is inhibited by accumulation of hydrogen chloride by-products, and selectivity is reduced due to excessive chlorination. The method provided by the invention comprises the following steps: dispersing chlorine into bubbles of 50 microns or below by adopting a metal sintering microbubble generator; a light source and a hollow fiber membrane separation assembly are arranged in the reactor, chlorine and ethylene carbonate are subjected to a reaction through photo-initiation to generate chloroethylene carbonate, and meanwhile generated hydrogen chloride is removed through membrane in-situ displacement by means of purging gas; the system adopts a two-section series structure, and the reaction depth is cooperatively controlled through sectional chlorine gas introduction and gradient illumination intensity. The method provided by the invention realizes efficient utilization of chlorine, real-time breaking of reaction balance and high-selectivity synthesis of monochlorinated products, and is suitable for continuous, safe and efficient industrial production of chloroethylene carbonate.

The invention discloses a gel electrolyte, a lithium ion battery and a preparation method of the lithium ion battery, and belongs to the technical field of lithium batteries. The invention discloses a gel electrolyte, which comprises a polymer main matrix, an initiator, a lithium salt, an organic solvent, a solid electrolyte and a coalescing agent, and the polymer main matrix comprises poly (vinylidene fluoride-hexafluoropropylene)-polyacrylonitrile-maleic anhydride-ethylene carbonate. The stability of the gel electrolyte is effectively improved.

The invention discloses a secondary battery and electronic equipment, the secondary battery comprises a first bag body, an electrode assembly and a first electrolyte, the first bag body encloses a first accommodating cavity, the electrode assembly and the first electrolyte are arranged in the first accommodating cavity, and the secondary battery further comprises a second bag body and a second electrolyte. A second containing cavity is defined by the second bag body, and the second electrolyte is arranged in the second containing cavity. The second electrolyte comprises ethylene carbonate, the mass percentage content of the ethylene carbonate in the second electrolyte is C1, and C1 is larger than or equal to 60% and smaller than or equal to 90%. A first wall part is arranged between the first bag body and the second bag body, the first containing cavity and the second containing cavity are separated through the first wall part, the melting point of the first wall part is T, and T is larger than or equal to 70 DEG C and smaller than or equal to 120 DEG C. The lithium precipitation interface of the electrode assembly can be rapidly passivated, the risk of thermal runaway of the secondary battery is reduced, and the safety performance of the secondary battery is improved.