16 results about "Ethyl carbonate" patented technology

This invention proposes a lithium-ion battery electrolyte and its application. The electrolyte comprises at least the following components: a fluorinated solvent, including 2,2-difluoroethyl acetate, fluoroethylene carbonate, and 2,2-difluoroethyl ethyl carbonate; a lithium salt, including a first lithium salt comprising lithium hexafluorophosphate; and an additive, including a first additive comprising lithium difluorobis(oxalato)phosphate. The lithium-ion battery electrolyte and its application proposed in this invention can improve the electrolyte's high-voltage resistance and kinetic performance, reduce battery impedance, and enhance the battery's fast-charging performance and high-temperature cycle stability.

This invention discloses a sodium-ion battery electrolyte, belonging to the field of sodium-ion battery technology, comprising an organic solvent, a sodium salt, and additives; the organic solvent includes ethylene carbonate, propylene carbonate, methyl ethyl carbonate, and ethyl acetate; the sodium salt includes sodium hexafluorophosphate and sodium difluorosulfonylimide; the additives include fluoroethylene carbonate, vinylene sulfate, sodium difluorophosphate, sodium difluorooxalate borate, and tris(trimethylsilane)phosphate. The sodium-ion battery electrolyte of this invention, through precise adjustment of the solvent and sodium salt ratio, maintains high conductivity at extremely low temperatures, significantly raising the lower limit operating temperature of the battery to -70°C. Simultaneously, through the synergistic effect of the sodium salt and additives, a high-temperature resistant SEI film rich in inorganic components is formed, reducing side reactions at high temperatures and raising the upper limit operating temperature of the battery to 85°C, achieving a wide temperature range application of the battery from -70°C to 85°C.

The present application relates to a kind of catalyst for preparing methyl ethyl carbonate, for preparing methyl ethyl carbonate with dimethyl carbonate and ethanol as raw material.The catalyst is composite catalyst M1 / FeM2O x Wherein, M1 is selected from one or several of Pd, Pt, Ni and Co metal state, M2 is selected from at least one of metal Mg, Zr, Ce and Zn, iron is divalent or trivalent, and x is 1-10.The present application also relates to a kind of preparation method of catalyst for preparing methyl ethyl carbonate, and a kind of method for preparing methyl ethyl carbonate.The composite catalyst M1 / FeM2O x Provided by the present application, due to the presence of M1, iron greatly improves the catalytic performance of M2 oxide, solves the problem of low activity of heterogeneous catalyst and easy loss of active component.

The application relates to a sodium ion battery wide-temperature electrolyte and a preparation method and application thereof, relates to the technical field of battery electrolytes, and solves the core problems of poor wide-temperature domain adaptability, low low-temperature ion conductivity and insufficient cycle stability of existing sodium ion battery electrolytes. The electrolyte comprises a sodium salt, a composite organic solvent and a functional additive; the composite organic solvent is a mixture of ethylene carbonate, methyl ethyl carbonate and methyl propionate; the functional additive is a mixture of vinylene carbonate and sodium difluoro oxalate borate; in an argon glove box with water oxygen content of less than or equal to 0.1 ppm, ethylene carbonate, methyl ethyl carbonate and methyl propionate are added into a preparation container, and are uniformly stirred at room temperature to obtain the composite organic solvent; sodium hexafluorophosphate is added in batches, and is stirred until completely dissolved to obtain a basic electrolyte; the functional additive is added into the basic electrolyte, and is uniformly stirred at room temperature to obtain the wide-temperature electrolyte. The application can meet the application requirements in the fields of extreme environment special power sources and the like.

The application discloses an ultralow-temperature aluminum electrolytic capacitor and a preparation method thereof. The capacitor comprises an anode foil, a cathode foil, an electrolytic paper between the anode foil and the cathode foil, and an electrolyte solution contained in the electrolytic paper. The electrolyte solution comprises, by weight percentage, propylene carbonate 15-25%, methyl ethyl carbonate 20-28%, diethylene glycol dimethyl ether 16-26%, lithium tetrafluoroborate 7-12%, lithium bisfluorosulfonylimide 2-5%, lithium difluorobisoxalate borate 2-5%, vinyl sulfate 4-8%, methanedisulfonate methylene 1.5-3.5%, mesoporous silicon dioxide 4-9%, lithium hexafluorophosphate 0.2-1.0%, lithium bis-trifluoromethanesulfonylimide 1.5-5%, a chelating agent 0.01-0.05%, and p-nitrophenol 0.3-1.2%. The preparation method comprises core wrapping, drying treatment, ring-type immersion, liquid removal treatment, assembly waist bundling, and aging treatment. The capacity retention rate of the capacitor can reach more than 90% at an ultralow temperature of -55 DEG C, and the Z ratio is only 1.29, so that the ultralow temperature and high temperature stability are synergistically improved.

The present invention relates to a method for preparing carbonate, the method comprising the steps of: supplying a raw material containing dimethyl carbonate and ethanol to an esterification reactor; inducing transesterification of the raw material in the presence of a sodium alkoxide-based catalyst to obtain an esterification product including ethylmethylcarbonate, diethylcarbonate, and methanol; supplying the esterification product to a distillation column to produce a top stream containing alcohol and a bottom stream containing a carbonate-based compound and the residual sodium alkoxide-based catalyst; filtering the bottom stream with a filter to remove the residual sodium alkoxide-based catalyst and obtain a catalyst-removed stream; and supplying the top stream and the catalyst-removed stream to a purification column so as to obtain a carbonate product, wherein the content of alcohol in the bottom stream is controlled to 6 wt % or less.

This application provides a methyl ethyl carbonate (MEC) production system and method, relating to the field of MEC production technology. The system includes: a reactive distillation column with a feed inlet, a separation inlet, and a first outlet; a first separation unit connected to the separation inlet to separate a first material; a neutralization evaporation unit connected to the first outlet; a second separation unit with a first circulation inlet, a fourth inlet, and a fourth outlet, the first circulation inlet connected to the reactive distillation column, and the neutralization evaporation unit connected to the fourth inlet; and a MEC column with a fifth inlet, a second circulation inlet, a product outlet, and a by-product outlet, the second circulation inlet connected to the fourth inlet, and the fourth outlet connected to the fifth inlet. The embodiments of this application achieve continuous production of MEC, recover and recycle the reaction raw materials, improve the utilization rate of raw materials, and increase the purity of methyl ethyl carbonate.

This invention relates to the chemical industry, specifically to a transesterification reaction system and a method for co-producing battery-grade methyl ethyl carbonate and diethyl carbonate. The system includes: a raw material vaporization unit, an adiabatic reaction unit, and an alcohol-ester separation unit connected in series along the material flow direction; and a purification unit, the inlet of which is connected to the ester-containing stream outlet of the alcohol-ester separation unit via a pipeline. The technical solution of this invention, by employing a gas-solid phase reaction within an adiabatic reactor, improves the reaction rate and reactor production capacity, reduces energy consumption, extends catalyst lifespan, simplifies the process flow, and reduces production costs while ensuring product purity.

The application discloses a kind of flame-retardant lithium ion battery electrolyte and preparation method thereof, belong to lithium ion battery electrolyte technical field, raw material includes diethyl carbonate, methyl ethyl carbonate, ethylene carbonate, lithium hexafluorophosphate, lithium difluoro (oxalato) borate and flame-retardant additive, wherein, diethyl carbonate, methyl ethyl carbonate, ethylene carbonate are solvent together, lithium hexafluorophosphate is lithium salt, lithium difluoro (oxalato) borate is lithium salt additive;Flame-retardant additive is with methyl methacrylate as shell material, with phosphoric acid ester flame retardant doped with heptafluorocyclopentane nano-capsule as core material, is prepared by suspension polymerization, can be uniformly dispersed in electrode liquid matrix, realizes that flame retardant and electrode surface are physically isolated, avoid phosphoric acid ester compound and negative electrode material sustained direct contact and interface side reaction, help to reduce the influence on lithium ion battery cycle performance.

This utility model relates to a device for removing metal particles from methyl ethyl carbonate (MEC) products. The technical solution is as follows: the inlet of the MEC storage tank is connected to the MEC production unit via a pipeline and a first magnetic filter; the outlet is connected to a parallel shielded pump via a pipeline; the outlet is connected to a loading platform via a pipeline, a membrane filter, and a second magnetic filter; and the output is connected to the MEC storage tank via a circulation pipeline control valve and a circulation pipeline. The beneficial effects are: the first magnetic filter removes metal particles from the MEC; during loading, the MEC is filtered by the shielded pump and the membrane filter, effectively improving the quality of the loaded MEC and avoiding potential flammability and explosion risks; furthermore, closing the loading platform control valve and circulating the MEC to the lower side of the storage tank improves the product quality within the storage tank.

The utility model relates to a reaction tower for methyl ethyl carbonate production, including tower body, be located carbonic acid dimethyl ester input pipeline, ethanol input pipeline, catalyst input pipeline and be located in the baffle of tower body inside, open the liquid leakage mouth no.

The present application relates to the technical field of organic synthesis, in particular to a method for homogeneously catalyzing co-production of methyl ethyl carbonate and diethyl carbonate, using 0.5-10% of organic sulfonic acid salt of borderline acid metal ion as catalyst, according to the molar ratio of dimethyl carbonate to ethanol being 1:5-12, reacting for 6-9 hours at 73-80 DEG C; collecting 64-130 DEG C fraction after normal pressure distillation of the reacted material to obtain mixed fraction containing methyl ethyl carbonate and diethyl carbonate. The technical scheme is superior to existing catalysts in catalytic activity, compatibility and stability, can efficiently catalyze transesterification to co-produce methyl ethyl carbonate and diethyl carbonate, ensure the yield of methyl ethyl carbonate being higher than that of diethyl carbonate, and solve the series of problems existing in the existing catalysts.

Battery cell, comprising the following: a case; and an electrode assembly located in the housing, wherein the electrode assembly comprises a cathode foil, an anode foil and a separator, the separator being located between the cathode foil and the anode foil, where the anode foil comprises an anode collector and an anode film layer located on at least one side of the anode collector, wherein the porosity of the anode film layer is 20% to 35%; wherein the anode film layer comprises an active anode material, wherein the active anode material comprises a silicon-based material and a carbon-based material, wherein the mass fraction of the Si element in the anode film layer is 1 to 10%, and wherein the volume-distributed particle size Dv50 of the active anode material is 10 µm to 20 µm; wherein the battery cell further comprises an electrolyte solution, wherein the electrolyte solution comprises an organic solvent and an electrolyte salt, wherein the organic solvent comprises methyl ethyl carbonate, wherein the mass fraction of the methyl ethyl carbonate in the organic solvent is greater than or equal to 55% and less than 100%.

This invention proposes a lithium-ion battery electrolyte and its application. The electrolyte comprises at least the following components: a fluorinated solvent, including 2,2-difluoroethyl ethyl carbonate and fluoroethylene carbonate; a lithium salt, including a first lithium salt, wherein the first lithium salt comprises lithium hexafluorophosphate; and an additive, including a first additive, wherein the first additive comprises tripropynyl phosphate. The lithium-ion battery electrolyte and its application proposed in this invention can improve the high-voltage resistance of the electrolyte and enhance the cycle stability and rate performance of the battery.

This application discloses an electrolyte, its preparation method, and its application, belonging to the field of battery technology. The electrolyte comprises a solvent, a composite lithium salt, and additives; the solvent includes fluorocarboxylic acid esters, methyl ethyl carbonate, and fluoroethylene carbonate; the composite lithium salt includes lithium bis(fluorosulfonyl)imide and lithium difluorooxalate borate; and the additives include vinyl sulfite and succinate. This electrolyte, through the synergistic effect of the solvent and the composite lithium salt, can improve the battery's performance over a wide temperature range, ensuring stable operation of the battery within this range.

This invention discloses a method for preparing methyl ethyl carbonate and diethyl carbonate via transesterification under ambient temperature and pressure. Using dimethyl carbonate and ethyl acetate as raw materials, and sodium methoxide or sodium ethoxide as a catalyst, the raw materials are continuously added to a reaction vessel at 5-25℃ and 0.1MPa±0.02MPa. The stirring rate is 50-100 r / min, the temperature fluctuation is ≤±1℃, and the material residence time is 5-30 minutes, reaching reaction equilibrium when the dimethyl carbonate conversion rate fluctuation is ≤±0.5%. After the reaction, the generated Na₂CO₃, NaHCO₃, and CH₃COONa mixed solids are removed by vacuum filtration, pressure filtration, or centrifugation. The equilibrium liquid is sent to a continuous distillation column for separation and purification through multi-column distillation to obtain methyl ethyl carbonate and diethyl carbonate. Unreacted raw materials are recycled, and the byproduct methyl acetate is sold as a chemical product. This invention features mild reaction conditions, low equipment requirements, high reaction efficiency, low energy consumption, simple separation, no azeotropic interference, high resource utilization, and is suitable for continuous production.