199 results about "Methyl carbonate" patented technology

The invention belongs to the technical field of recycled polyester, and particularly relates to a waste polyester textile recycling method which comprises the following steps: decolorizing colored waste polyester textiles by adopting a decolorizing agent which is more than one of dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate; the depolymerization agent is adopted to depolymerize the decolored polyester textile to obtain the terephthalate, and the depolymerization rate of the decolored polyester textile is 98.0-100%; firstly, terephthalate is converted into DMT, and then DMT, ethylene glycol, a catalyst and a functional additive are subjected to a repolymerization reaction to obtain regenerated PET. According to the method, a process of decoloring and depolymerizing sequentially is adopted, and decoloring and depolymerizing are coordinated, so that the process is simplified, the energy consumption and pollution are reduced, and the economical efficiency and sustainability of waste polyester textile recycling are improved.

The invention belongs to the technical field of regenerated polyester, and particularly relates to a waste cotton-polyester blended fabric recycling method which comprises the following steps: firstly, decolorizing a colored waste cotton-polyester blended fabric by adopting a decolorizing agent, then mixing a depolymerizing agent, isosorbide dimethyl ether, a first catalyst and the decolorized cotton-polyester blended fabric, and then carrying out depolymerization reaction, the decolorizing agent and the depolymerizing agent are more than one of dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate, and the temperature of the depolymerizing reaction is 130-150 DEG C; washing the separated cotton fibers with water, and screening to remove residual polyester powder on the surfaces; firstly, terephthalate is converted into DMT, and then DMT, ethylene glycol, a second catalyst and a functional additive are subjected to a repolymerization reaction to obtain regenerated polyethylene glycol terephthalate. According to the method, depolymerization and polyester cotton separation processes are ingeniously fused, so that the operation steps are simplified, the energy consumption is reduced, and the purity of a depolymerization product is also improved.

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 the technical field of lithium batteries, in particular to a low-temperature electrolyte and a lithium battery containing the low-temperature electrolyte, the low-temperature electrolyte comprises the following components in percentage by mass: 75-85% of solvent, 11-18% of electrolyte salt and 0.5-2% of additive, the electrolyte salt comprises one or more of lithium hexafluorophosphate, lithium difluoro (oxalato) borate, lithium bis (fluorosulfonyl) imide and lithium bis (trifluoromethanesulfonyl) imide, and the additive comprises a film-forming agent, a low-temperature reinforcing agent and a dendritic crystal inhibitor. By optimizing the synergistic effect of the solvent system and the electrolyte salt, the freezing point and viscosity of the electrolyte are effectively reduced, the migration rate of lithium ions at low temperature is enhanced, and it is ensured that the battery can still be efficiently charged and discharged under the low-temperature condition.

The invention belongs to the technical field of regenerated polyester, and particularly relates to a waste polyester-spandex blended fabric recovery method, which comprises the following steps: carrying out decoloration and depolymerization on a colored waste polyester-spandex blended fabric by using a treating agent; and depolymerizing the decolored polyester fabric by using a depolymerizing agent to obtain the terephthalate. Wherein the treating agent is more than one of dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate; the depolymerizing agent is the same as the treating agent; the depolymerization rate of spandex in the waste polyester-spandex blended fabric is 98-100%, and the decolorization rate of the waste polyester-spandex blended fabric calculated according to the K / S value is 98% or above. The method breaks through the bottlenecks of high pollution and high energy consumption of the traditional process, and solves the contradiction that component separation and decoloration are difficult to take into account in the recovery process of the blended fabric.

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 concrete, and particularly relates to a polycarboxylate superplasticizer and a preparation method thereof. The polycarboxylate superplasticizer is prepared from an unsaturated polyether macromonomer, an unsaturated acid monomer, an unsaturated carbonate monomer, an unsaturated amino monomer, an initiator, a reducing agent, a chain transfer agent, deionized water, a solubilizer and organic alcohol amine. Wherein the unsaturated carbonate monomer is allyl methyl carbonate, and the unsaturated amino monomer is 2-aminoethyl methacrylate hydrochloride. According to the invention, excellent water reducing effect and stable control capability on concrete slump are maintained, and micro-cracks can be effectively made up through a dual mechanism formed by carbonate release and CaCO3 precipitation in the early and later stages of concrete hardening.

The application belongs to the technical field of regenerated polyester, and particularly relates to a recycling method of waste polyester textiles, which comprises the following steps: decolorizing colored waste polyester textiles by using a decolorizing agent, wherein the decolorizing agent is one or more of dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate; depolymerizing the decolorized polyester textiles by using a depolymerizing agent to obtain terephthalate, wherein the depolymerization rate of the decolorized polyester textiles is 98.0-100%; converting the terephthalate into DMT first, and then performing a re-polymerization reaction on the DMT, ethylene glycol, a catalyst and a functional additive to obtain regenerated PET. The application adopts a process of decolorizing first and then depolymerizing, and the decolorizing and depolymerizing are coordinated, so that the process is simplified, the energy consumption and pollution are reduced, and the economy and sustainability of the recycling of waste polyester textiles are improved.

The present disclosure relates to a method for separating, purifying and recovering an electrolyte, which method comprises the following steps: (1) mixing an electrolyte of a power battery with a stabilizer, and then subjecting same to a first reduced-pressure distillation treatment, so as to obtain an electrolyte solvent; (2) subjecting the electrolyte solvent obtained in step (1) to a second reduced-pressure distillation treatment, and separating same to obtain a first light component and a heavy component; and dehydrating the obtained first light component, so as to obtain a second light component; and (3) rectifying the second light component obtained in step (2), so as to obtain dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate; and crystallizing and melting the heavy component obtained in step (2), so as to obtain ethylene carbonate. In the present disclosure, all the solvents in the electrolyte of a power battery are separated and purified to obtain a re-commercializable carbonate product having a high yield and a high purity, thereby achieving green cyclic utilization of the electrolyte.

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 discloses a sodium-philic current collector and a negative-electrode-free sodium ion battery comprising the same. According to the sodium-philic current collector, carbon-coated aluminum foil is subjected to nitrogen plasma treatment, nitrogen doping sites are formed on a carbon-coated layer, the affinity to sodium can be enhanced, and uniform deposition of sodium is promoted; according to the electrolyte, a cosolvent of diethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether is adopted, sodium hexafluorophosphate, sodium tetrafluoroborate and sodium trifluoromethanesulfonate are compounded, (3-fluorophenyl)-oxoacetonitrile and allyl methyl carbonate are added to serve as electrolyte additives, a weak solvation structure is formed, a solid electrolyte interfacial film rich in boron and fluorine is constructed, and side reactions are inhibited; sodium oxalate is added to the positive electrode as a sodium supplementing agent to make up the loss of active sodium caused by low first charge-discharge efficiency. The invention solves the problems of low first charge-discharge efficiency and poor dendritic crystal growth and cycle stability of the non-anode sodium ion battery, has high energy density and process simplicity, and is suitable for large-scale production.

The invention relates to the technical field of organic carbonate synthesis, in particular to a method for synthesizing methyl ethyl carbonate by using a liquid heterogeneous catalyst to catalyze transesterification, which comprises the following steps: by taking long-chain tertiary amine as a catalyst, catalyzing dimethyl carbonate and diethyl carbonate to perform transesterification reaction in a liquid heterogeneous manner to synthesize the methyl ethyl carbonate. The liquid heterogeneous catalyst expands the variety of catalysts for synthesizing methyl ethyl carbonate through ester-ester exchange, does not need to be specially filled, is high in equipment utilization rate and free of abrasion and corrosion to equipment, and has the advantages of being easy to disperse uniformly, high in catalytic efficiency, convenient to feed, convenient to use and the like.

The invention relates to the technical field of organic carbonate synthesis, in particular to a method for synthesizing methyl ethyl carbonate by using long-chain tertiary amine to catalyze ester exchange, which comprises the following steps: by taking 0.3-10% of long-chain tertiary amine as a homogeneous catalyst, reacting dimethyl carbonate with ethanol for 3-8 hours at 70-85 DEG C according to the mass part ratio of 1.6-10: 1 to prepare the methyl ethyl carbonate. The long-chain tertiary amine catalyst has no corrosion to equipment, is high in ester exchange catalytic activity and convenient to use, shows stability and water resistance superior to those of sodium alkoxide, and has relatively high cost performance.

The invention relates to a preparation method of a lithium difluoro-bis (oxalate) phosphate concentrated solution, the lithium difluoro-bis (oxalate) phosphate concentrated solution is composed of lithium difluoro-bis (oxalate) phosphate and an aprotic solvent, the aprotic solvent comprises any one or a combination of at least two of diethyl carbonate, ethyl methyl carbonate, ethylene carbonate or propylene carbonate, the concentration of the lithium difluoro-bis (oxalate) phosphate in the lithium difluoro-bis (oxalate) phosphate concentrated solution is 10-35 wt%. The lithium difluoro bis (oxalate) phosphate concentrate provided by the invention exists in a non-proton electrolyte state, so that an evaporative crystallization process is omitted, and the production cost is reduced; the product transportation cost can be reduced through pipeline transportation; and compared with a lithium phosphate solid difluoro bis (oxalate), the process of re-dissolution during use is omitted, the risk of impurity introduction is avoided, and the use cost is reduced.

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 present invention makes it possible to provide a solid electrolyte sheet to be used as a separator layer that separates a positive electrode layer from a negative electrode layer in an all-solid-state battery, the solid electrolyte sheet comprising a support base material and a boron cluster-type solid electrolyte. Furthermore, the present invention makes it possible to provide a method for producing a solid electrolyte sheet, the method comprising a step for preparing a solid electrolyte solution obtained by dissolving a boron cluster-type solid electrolyte in a solvent, and a step for obtaining a solid electrolyte sheet by applying the obtained solid electrolyte solution to a support base material and then drying the result, wherein the solvent contains at least one substance selected from the group consisting of water, alcohol-based solvents, tetrahydrofuran, acetonitrile, toluene, N-methylpyrrolidone, dimethyl carbonate, and ethyl acetate.

The invention discloses a PET screen cloth roughing-free treating agent for the shoe making industry and a preparation method thereof, and belongs to the technical field of treating agents. The high-temperature-resistant and corrosion-resistant coating is prepared from the following components in parts by weight: 20 to 25 parts of hydroxyl-terminated polyester resin, 8 to 12 parts of silane modified TPU, 5 to 8 parts of PDMS-g-acrylate, 3 to 5 parts of monoethyl fumarate, 0.05 to 0.16 part of an antioxidant DHOP / 168, 0.2 to 0.5 part of ZrO2-CeO2, 0.04 to 0.06 part of a metal ion passivator, 30 to 40 parts of ethyl acetate / dimethyl carbonate and 0.15 to 0.3 part of TCCA. The treatment agent prepared by the preparation method disclosed by the invention has high peel strength, low yellowing and excellent hydrolysis resistance while realizing no roughing of the PET screen cloth, solves the problem that adhesion and weather resistance of a traditional treatment agent are difficult to consider at the same time, and remarkably improves the efficiency of a shoemaking process and the durability of a product.

The invention discloses a battery grade methyl ethyl carbonate / diethyl carbonate synthesis process, which adopts a transesterification method, and dimethyl carbonate (DMC) and ethanol react under the catalysis of sodium methoxide to generate methyl ethyl carbonate (EMC), diethyl carbonate (DEC) and byproduct methanol. High-purity battery-grade EMC and DEC products are obtained through the steps of reactive distillation, azeotrope separation, methanol refining, catalyst carbonization removal, crude EMC / DEC separation, EMC light component removal, industrial-grade EMC refining, battery-grade EMC refining, industrial-grade DEC refining, battery-grade DEC refining and the like. The method has the advantages of simple process flow, low energy consumption, easiness in product separation, high product purity and the like, and is suitable for large-scale production of battery-grade carbonate products.

This invention relates to a safety control method and system for the preparation of ethyl methyl carbonate (EMC). The method involves feeding dimethyl carbonate into an EMC purification tower, monitoring the pressure within the tower, and adjusting the pressure if it falls outside a preset range. The purity of the output dimethyl carbonate is also monitored. The output dimethyl carbonate, a sodium methoxide / methanol solution, and anhydrous ethanol are mixed in a specified ratio in a raw material mixing unit to achieve the required homogeneity. Pressure and temperature are monitored in an EMC reaction tower; if these requirements are not met, pressure or temperature is adjusted. The bottom liquid from the EMC reaction tower is transferred to a waste catalyst concentration tank for further processing, and then to an EMC light-weight removal tower for further treatment. Temperature and pressure are monitored within the EMC light-weight removal tower; if the pressure falls outside a preset range, pressure or temperature is adjusted. After cooling, the final EMC product is obtained. This process ensures safe and stable production of ethyl methyl carbonate.

The invention discloses an electrolyte for a lithium battery, which comprises an organic solvent, a lithium salt and an additive, and the mass percentage ratio of the organic solvent to the lithium salt to the additive is (70-90): (5-20): (0.2-10); the organic solvent is composed of cyclic carbonate and chain carbonate in a mass ratio of (10-30): (70-90); the lithium salt is one or more of lithium hexafluorophosphate, lithium perchlorate and lithium tetrafluoroborate; the additives comprise a high-temperature stabilizer, an antioxidant and a film-forming accelerant, the cyclic carbonate is one or two of ethylene carbonate and propylene carbonate, and the chain carbonate is one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate and methyl propyl carbonate. By optimizing the components of the electrolyte, the stability of the electrolyte at a high temperature is improved, and decomposition and side reactions are reduced, so that the performance of the battery in a high-temperature environment is improved, and the cycle life of the battery in a high-temperature environment is prolonged.

An electrolyte for a battery cell, a battery cell for a vehicle and a method of forming a battery cell. The electrolyte includes a combination of lithium ion salts including lithium hexafluorophosphate (LiPF6), lithium bis(fluorosulfonyl)imide, and lithium difluoro(oxalato)borate. The electrolyte also includes a carbonate solvent including fluoroethylene carbonate, ethyl methyl carbonate, and a carboxylic acid ester exhibiting the following formula:wherein R1 and R2 are individually an unsubstituted alkyl group including in the range of 1 carbon to 2 carbons, wherein the combination of lithium ion salts is dispersed in the carbonate solvent. The electrolyte further includes vinylene carbonate. The electrolyte does not include ethyl carbonate.

A lithium-ion battery with an electrode assembly is shown. The electrode assembly has a current collector and a positive active material layer on the current collector. The electrode assembly also has an electrolyte containing lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide in a ratio of 0.8 M to 0.2 M and a fluorinated phosphazene additive at 7 wt.% dissolved in a mixed solvent of ethylene carbonate, ethyl methyl carbonate, and sulfolane in a volume ratio of 25 / 73 / 2. The electrolyte permeates a surface of the positive active material layer to suppress electrochemical oxidation of the positive active material layer.

The invention relates to the technical field of batteries, and discloses an electrolyte and application thereof, and a lithium carbon fluoride battery. The electrolyte comprises a lithium salt and an organic solvent; wherein the lithium salt is lithium bis (fluorosulfonyl) imide; the organic solvent is selected from one of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene carbonate, propylene carbonate, dimethyl carbonate, ethyl methyl carbonate, dimethylformamide, dimethylacetamide and dimethyl sulfoxide. The electrolyte can be applied to preparation of a lithium primary battery. The invention also relates to a lithium carbon fluoride battery comprising the electrolyte. The electrolyte system provides an optimized solution for the preparation of the high-energy-density lithium carbon fluoride battery, has a wide application prospect, can remarkably improve the performance of the battery, reduces the production cost, and promotes the further development of the lithium carbon fluoride battery technology.

The invention relates to the technical field of degradable films, and particularly discloses a long-acting antibacterial degradable film material and a preparation method thereof. The long-acting antibacterial degradable film material is prepared from the following raw materials in parts by weight: 40 to 80 parts of matrix resin, 15 to 35 parts of hydrophobic modified chitosan, 5 to 10 parts of antibacterial agent master batch and 5 to 10 parts of reinforcing agent, the hydrophobic modified chitosan is stearaldehyde grafted chitosan at polylactic acid, and the antibacterial agent master batch is siloxane modified dioctadecyl dimethyl ammonium methyl carbonate at polylactic acid. The material can be well compatible with a hydrophobic polymer matrix, migration and loss of antibacterial components can be inhibited, long-acting stable antibacterial performance is achieved, good mechanical performance and barrier performance are kept, meanwhile, environment degradability of the whole life cycle is ensured, and therefore the urgent requirement of modern green packaging for high-performance, multifunctional and sustainable materials is met.

The application provides a low-temperature electrolyte, a positive electrode slurry and a low-temperature sodium ion battery, and belongs to the technical field of battery materials.The low-temperature electrolyte 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 comprises the low-temperature electrolyte.The low-temperature electrolyte and the low-temperature sodium ion battery can not only be compatible with blended positive electrode materials, but also take into account the low-temperature performance, ensure that the prepared low-temperature sodium ion battery has good reaction kinetics and cycle performance, and can also improve the energy density of the electrode and reduce the powder resistivity.

The invention discloses an all-component recovery method and application of a waste lithium ion battery electrolyte, and belongs to the technical field of resource utilization of lithium ion batteries. The method comprises the following steps: disassembling the waste battery in a light mineral oil environment to realize safe and efficient electrolyte collection; then adding a weak base solution into the electrolyte for reaction, selectively precipitating and recovering high-purity lithium salt; and finally, separating and purifying the organic solvent component through two-step reduced pressure distillation to obtain dimethyl carbonate, methyl ethyl carbonate and ethylene carbonate. The method does not need inert gas protection, is simple in process flow, low in cost and high in safety, effectively solves the problems that the electrolyte is easy to volatilize, inflammable and easy to pollute, wastes resources and the like in the traditional recovery process, realizes efficient recovery and high-valued utilization of valuable components in the electrolyte, can be used for preparation of regenerated electrolyte, and is suitable for industrial production. The method has good economic benefits and environmental benefits.

The invention relates to the technical field of flame-retardant low-temperature electrolyte, in particular to flame-retardant low-temperature electrolyte for a lithium metal battery with a thin lithium negative electrode, a preparation method and application. Comprising soluble lithium salt and an organic solvent, the organic solvent comprises the following components in parts by mass: 10-40 parts of ethylene carbonate; 10 to 40 parts of methyl ethyl carbonate; 0 to 30 parts of ethyl propionate; 10 to 40 parts of diethyl carbonate; 0 to 30 parts of ethyl 2-fluoropropionate; 0 to 30 parts of ethyl 2, 2-difluoropropionate; 10 to 50 parts of ethyl 3, 3, 3-trifluoropropionate; and 0-30 parts of one or a combination of more of the components. The fluorine-containing solvent containing the fluorine-containing group and the multifunctional lithium salt are used, the cycle performance of the LiLi symmetric battery can be remarkably improved, the coulombic efficiency of the LiCu half-battery can be remarkably improved, the coulombic efficiency of the LiCu half-battery can be remarkably improved by using the fluorine-containing solvent containing the fluorine-containing group and the multifunctional lithium salt, and the coulombic efficiency of the LiCu half-battery can be remarkably improved by using the fluorine-containing solvent containing the fluorine-containing group and the multifunctional lithium salt. The capacity retention ratio of the thin lithium negative electrode NCM811 total battery can be obviously improved, and meanwhile, the cycle life is prolonged.

To provide a separator for a non-aqueous electrolyte secondary battery that can provide a battery with excellent capacity retention characteristics after pressurization.SOLUTION: The separator for a non-aqueous electrolyte secondary battery according to the present disclosure includes a polyolefin porous substrate and a heat-resistant layer stacked on top of the polyolefin porous substrate. Under conditions of a temperature of 25°C and a relative humidity of 60 to 70%, a solution composed of ethylene carbonate, ethyl methyl carbonate, and dimethyl carbonate mixed in a volume ratio of 3:5:2 retains at least 50% of its volume after 300 seconds of holding.SELECTED DRAWING: None

The invention discloses a pressure relief mechanism and a preparation method thereof, a battery and an electric device. The pressure relief mechanism comprises a metal valve body; the anti-corrosion coating is arranged on at least one part of the surface of the metal valve body, the swelling rate of the anti-corrosion coating soaked in electrolyte for 24 h at the temperature of 60 DEG C is smaller than or equal to 2%, the electrolyte is formed by mixing ethylene carbonate and dimethyl carbonate according to the volume ratio of 1: 1 to serve as a solvent, LiPF6 serves as lithium salt, and the concentration of the lithium salt is 1 mol / L. Therefore, anions and cations in the electrolyte can be prevented from permeating into the coating to corrode the metal valve body, the corrosion-resistant effect of the pressure relief mechanism is improved, and the risk of opening the valve in advance or battery cell leakage is reduced.

The invention relates to a key technology of a lithium ion capacitor electrolyte and an electrolyte additive. The electrochemical performance of the lithium ion capacitor electrolyte can be effectively improved. The invention mainly relates to an electrolyte additive prepared from lithium halide, diatomite, graphite powder, urethane acrylate and an acrylic monomer, and a mixed electrolyte prepared from the additive and a common electrolyte containing lithium hexafluorophosphate, ethylene carbonate and dimethyl carbonate. The lithium capacitor electrolyte additive can effectively reduce the internal resistance of the electrolyte, and the cycle capacity and retention rate of the lithium capacitor can be effectively improved by adopting the electrolyte.