225 results about "Diethyl 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 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.

The invention provides an electrolyte, an electrochemical device and an electronic device, the electrolyte comprises lithium difluorophosphate, a dinitrile compound and diethyl carbonate, based on the total mass of the electrolyte, the mass percentage content of the dinitrile compound is A%, the mass percentage content of the diethyl carbonate is B%, 10 < = A + B < = 24, and 0.8 < = A < = 3. The electrolyte comprising the lithium difluorophosphate, the dinitrile compound and the diethyl carbonate is adopted, the value of A + B is regulated and controlled, and the value of A is within the range, so that the high-temperature storage performance, the high-temperature cycle performance, the low-temperature discharge performance and the safety performance of the electrochemical device can be improved.

The invention provides an electrolyte, an electrochemical device and an electronic device, and belongs to the technical field of energy storage. Based on the mass of the electrolyte, the electrolyte comprises ethylene carbonate with the mass content of A%, methyl propyl carbonate with the mass content of B%, diethyl carbonate with the mass content of C%, ethyl propionate with the mass content of D% and propyl propionate with the mass content of E%; wherein 5 < = A < = 20, 10 < = B < = 20, and 0.1 < = A / (B + C + D + E) < = 0.5. By controlling the components and the mass content of the electrolyte, the components are matched with one another, so that the high-temperature cycle capacity retention ratio of the battery can be improved, the increase of the thickness of the battery in a high-temperature and high-humidity storage environment is controlled, the service life of the battery is prolonged, and the use safety of the battery is improved.

The invention relates to the technical field of batteries, in particular to a battery. The battery comprises a positive plate, a negative plate, electrolyte and a diaphragm located between the positive plate and the negative plate, the diaphragm comprises a base material and a ceramic layer located on the surface of one side or two sides of the base material, the ceramic layer comprises inorganic particles, the ceramic layer is of a porous structure, the porous structure comprises holes with the diameter larger than or equal to 0.5 micrometer, and the inorganic particles are distributed in the range of 100 micrometers * 100 micrometers randomly selected on the surface of the ceramic layer. The number of the holes with the diameter larger than or equal to 0.5 micrometer is 10-800, and the coverage rate A1 of the holes with the diameter larger than or equal to 0.5 micrometer in the surface of the ceramic layer is 10%-50%; the electrolyte comprises an organic solvent, and the organic solvent comprises at least two of dimethyl carbonate, ethyl methyl carbonate, propylene carbonate, ethylene carbonate, diethyl carbonate, propyl propionate, ethyl propionate and ethyl acetate. The battery disclosed by the invention can have relatively high quick-charge cycle performance and rate capability under the condition that the safety performance is not influenced.

The invention discloses an electrolyte composition, application thereof and a lithium ion battery. The electrolyte composition comprises a first electrolyte and a second electrolyte, the first electrolyte comprises a base solution, vinylene carbonate, methylene methanedisulfonate, ammonium perfluorooctane sulfonate and 1, 3, 6-hexane trinitrile, and the second electrolyte comprises a base solution, vinylene carbonate and fluoroethylene carbonate, the basic solution is a mixed solvent in which lithium salt is dissolved, and the mixed solvent comprises at least two of ethylene carbonate, propylene carbonate and diethyl carbonate. The electrolyte composition can be applied to preparation of a lithium ion battery for supplementing lithium. The invention also discloses a lithium ion battery comprising the electrolyte composition, a positive pole piece containing a lithium supplement agent, a negative pole piece containing a lithium supplement agent and a diaphragm. According to the electrolyte composition, the lithium supplement agent can play a better lithium supplement role, the 45 DEG C cycle performance of the lithium supplement battery is obviously improved, and the 45 DEG C cycle capacity is kept at 94% or above.

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 invention relates to a secondary battery and an electronic device. Specifically, the secondary battery provided by the invention comprises a positive electrode, a negative electrode and an electrolyte, the negative electrode comprises a negative electrode current collector and a negative electrode material arranged on the negative electrode current collector, the particle size of the negative electrode material satisfies Dv10: Dv50: Dv99 = 1: (1.5-2.5): (5-6), the electrolyte comprises diethyl carbonate, ethylene carbonate and 1, 3-propane sultone, and relative to 100 parts by mass of the electrolyte, the particle size of the negative electrode material is 1: (1.5-2.5): (5-6). The content of the ethylene carbonate is 15-30 parts by mass, the content of the diethyl carbonate is 0.5-1.5 parts by mass, the content of the ethylene carbonate is 15-30 parts by mass, and the content of the 1, 3-propane sultone is 0.01-0.5 parts by mass. According to the invention, the over-current and over-temperature safety of the secondary battery can be 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 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.

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.

A metal ion cell that includes a positive electrode with a cathode active material configured to store and release metal ions: a negative electrode with an anode active material that operates at a potential that is not less than 0.6 volts (V) versus Li / Lit; and an electrolyte that incorporates one or more (e.g., lithium) metal salts and a solvent mixture that includes 3-methoxypropionitrile (MPN) and at least one linear carbonate. The MPN in the electrolyte may have a mass ratio of ≥0.1 as compared to the at least one linear carbonate. The at least one linear carbonate includes one or more of dimethyl carbonate (DMC), diethyl carbonate (DEC), or ethyl methyl carbonate (EMC). The solvent mixture may also include a mixture of carbonates, such that the mass percentage of the linear carbonate ranges from 10% to 90% compared to the overall mass of the mixture of carbonates.

The invention discloses a low-temperature electrolyte for a laminated soft-package lithium ion battery, the lithium ion battery and a preparation method of the lithium ion battery. Comprising the following components: 4%-6% of propylene carbonate, 9%-11% of diethyl carbonate, 30%-32% of methyl ethyl carbonate, 24%-26% of ethylene carbonate, 9%-11% of ethyl propionate, 14%-16% of electrolyte salt and 3.6%-4.0% of an additive, according to the low-temperature electrolyte and the lithium ion battery, the solvent and the additive of the electrolyte are optimally combined, so that the obtained electrolyte has the characteristics of high conductivity and low impedance at low temperature, the low-temperature charge-discharge performance of the lithium ion battery can be remarkably improved, in addition, the obtained low-temperature electrolyte and the lithium ion battery have wide application prospects, and the application prospect is wide. And the method is especially suitable for the field with high low-temperature performance requirements.

The present disclosure provides an electrolyte for a lithium metal battery, containing a lithium salt, a solvent and a diluent including 1,2-difluorobenzene, wherein the lithium salt comprises one or more selected from the group consisting of lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), and lithium hexafluorophosphate (LiPF6), the solvent comprises one or more selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), ethylene carbonate (EC), and propylene carbonate (PC).

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.

The low-temperature electrolyte 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): (0.2-3); the organic solvent is composed of cyclic carbonate, chain carbonate and chain carboxylate, the mass percentage of the cyclic carbonate, the chain carbonate and the chain carboxylate is 10-20: 10-30: 10-80, the cyclic carbonate is one or two of ethylene carbonate and propylene carbonate, the chain carbonate is one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate and methyl propyl carbonate, and the chain carboxylate is one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate and methyl propyl carbonate. The lithium salt is one or more of lithium hexafluorophosphate, lithium perchlorate and lithium tetrafluoroborate. Compared with a single auxiliary additive, the low-temperature performance of the electrolyte can be remarkably improved by combining the amino-containing nicotinonitrile compound with the auxiliary additive according to the proportion.

The invention relates to the technical field of lithium battery production, in particular to a high-safety lithium ion battery manufacturing method, which comprises a positive plate, a negative plate, a diaphragm and an electrolyte, the method comprises the following steps: 1) preparing a positive plate, wherein the positive plate is composed of a positive current collector and a positive material coated on the positive current collector; the electrolyte is a safe electrolyte, the solvent comprises 10%-15% of ethylene carbonate (EC), 30%-35% of diethyl carbonate (DEC), 10%-15% of propylene carbonate (PC) and 20%-25% of propyl propionate (PP), the additives comprise 2%-3% of VC, 2%-3% of PS, 0.5-1% of LiBOB, 1-2% of SN, 2-3% of HTCN, 0.5-0.7% of LiODFB and 0.1-0.3% of FPOP, the electrolyte is LiPF6, the content is 1.1-1.2 mol, the conductivity is larger than or equal to 8.0 ms / cm, Al2O3 ceramic powder is added in the formula of the positive electrode and the negative electrode, and the safety performance is improved; the diaphragm coated with ceramic on both sides is used, and the double-sided ceramic diaphragm is small in thermal shrinkage and high in puncture resistance, so that the safety can be effectively improved.

The invention provides a wide-temperature-range sodium-ion battery electrolyte, a sodium-ion battery and a power utilization device. The wide-temperature-range sodium-ion battery electrolyte comprises a sodium salt, an organic solvent and a single-component additive, the sodium salt is sodium bis (fluorosulfonyl) imide; the organic solvent is a composite solvent composed of ethylene carbonate, propylene carbonate and diethyl carbonate; the additive is an unsaturated ester additive; based on the mass of the electrolyte, the use amount of the additive is 0.1-5wt%; based on the volume of the electrolyte, the amount-of-substance concentration of the sodium salt is 0.5-3 mol / L; the conductivity of the electrolyte at the temperature of-30 DEG C is 0.1-5 mS cm <-1 >, and the conductivity of the electrolyte at the temperature of 55 DEG C is 10-20 mS / cm. And the battery can stably work in a wide temperature range from-30 DEG C to 55 DEG C, and the use requirement of the battery under a relatively wide temperature working condition is met.

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 the field of fine chemical technology, specifically disclosing a production process for electronic-grade diethyl carbonate. The method includes the following steps: ethylene carbonate and anhydrous ethanol undergo a transesterification reaction in a microwave reactor catalyzed by a composite catalyst; the reaction solution is then subjected to phase separation treatment, followed by a continuous separation process coupling atmospheric and vacuum distillation to obtain an intermediate; further purification is achieved by molecular sieve adsorption to remove metal impurities and moisture, combined with precision filtration using a polytetrafluoroethylene membrane. The composite catalyst significantly improves the transesterification reaction efficiency and product selectivity. This process, through the synergistic effect of reaction process enhancement and multi-stage purification technology, achieves highly efficient removal of moisture, metal impurities, and nanoscale particles from the reaction system. The resulting electronic-grade diethyl carbonate meets the stringent requirements of high-end electronic chemicals such as lithium battery electrolytes, and possesses technical advantages such as short reaction cycle, thorough impurity removal, and high product purity.

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.

The invention discloses a preparation method of p-phenylethylether, p-phenylethylether is prepared from hydroquinone and diethyl carbonate in a high-selectivity manner under the catalysis of a catalyst, and the catalyst is a Zr / Ho-loaded SAPO molecular sieve catalyst. The process is green and environment-friendly, few in three wastes, high in catalyst reaction activity, good in stability, simple to separate and high in product yield, and has a good industrial application prospect.

Disclosed in the present application are an electrolyte, an electrochemical apparatus and an electronic device. The electrolyte contains a carbonic ester compound and a substance T, wherein the substance T comprises a sulfur-containing compound; the carbonic ester compound comprises at least two of ethyl propionate, propylene carbonate, diethyl carbonate or propyl propionate, and at least contains ethyl propionate; and based on the total mass of the electrolyte, the mass percentage content of the carbonic ester compound is A, and the mass percentage content of the sulfur-containing compound is B, both of which satisfy: 6.5≤A / B≤45. The electrolyte of the present application can alleviate the expansion of a lithium-ion battery during charging and discharging, which is beneficial for improving the overcharge safety performance of the lithium-ion battery at a high temperature.

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.

A lithium secondary battery includes: a positive electrode; a negative electrode; a separator interposed between the positive electrode and the negative electrode; and a nonaqueous electrolyte. The positive electrode includes a positive electrode active material including a lithium-rich manganese-rich oxide containing 50 mol% or more of Mn among all metal elements other than lithium and having a molar ratio of lithium to transition metal of more than 1, and the non-aqueous electrolyte includes a lithium salt and an organic solvent. The organic solvent includes a first organic solvent and a second organic solvent, the first organic solvent includes ethylene carbonate, and the second organic solvent includes diethyl carbonate and propyl propionate.

The invention specifically discloses a method for preventing a lithium carbon fluoride battery negative electrode from being corroded. The invention relates to a method for preventing corrosion of a negative electrode of a lithium carbon fluoride battery, which comprises the following steps: preparing the lithium carbon fluoride battery by using an electrolyte containing a first solvent and a second solvent in a formula, and controlling the ratio of the first solvent to the second solvent so that the volume ratio of the second solvent in a mixed solvent is less than 50%; wherein the first solvent comprises at least one of propylene carbonate, gamma-butyrolactone, ethylene carbonate, butylene carbonate and diethyl carbonate; the second solvent comprises at least one of ethylene glycol dimethyl ether, tetrahydrofuran, dimethyl carbonate and methyl ethyl carbonate. The electrolyte has the advantages that the content of free fluorine in the electrolyte for the lithium carbon fluoride battery is reduced, so that the storage stability and the use safety of the lithium carbon fluoride battery are improved.

The invention provides an electrochemical device and an electronic device, and belongs to the technical field of energy storage. Wherein the electrochemical device comprises a positive electrode, a negative electrode and an electrolyte; based on the mass of the electrolyte, the electrolyte comprises ethylene carbonate with the mass content of A%, propylene carbonate with the mass content of B%, diethyl carbonate with the mass content of C%, propyl propionate with the mass content of D% and 2, 2-ethyl difluoroacetate with the mass content of E%; 0.3 < = (A + B) / (C + D + E) < = 1.25; 20 < = A < = 30; 20 < = E < = 30. By controlling the components and the mass content of the electrolyte, the components are matched with one another, so that the consumption rate of the electrolyte and the expansion rate of the battery in the circulation process are reduced.