121 results about "Diethyl carbonate" patented technology

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 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.

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.

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.

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.

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.

Disclosed is a preparation method for cannflavin compounds. The preparation method has the advantages of cheap and easily available raw materials, few reaction steps, short production period, simple operation, etc. The method comprises: firstly, condensing 4′-hydroxy-3′-methoxyacetophenone and diethyl carbonate (DEC) under an alkaline condition to obtain 4′-hydroxy-3′-methoxybenzoyl acetate; reacting 1,3,5-trihydroxybenzene with bromo-isoamylene under an alkaline condition to obtain 2-isopentenyl-1,3,5-trihydroxybenzene; and finally, condensing 4′-hydroxy-3′-methoxybenzoyl acetate and 2-isopentenyl-1,3,5-trihydroxybenzene at a high temperature to produce cannflavin B and / or isocannflavin B, and then subjecting same to separation and purification to obtain pure cannflavin B and pure isocannflavin B.

The invention belongs to the technical field of lithium ion battery electrolyte, and particularly relates to high-voltage electrolyte for a fast-charging lithium ion battery as well as a preparation method and application of the high-voltage electrolyte. Comprising the following substances: a main solvent, which comprises diethyl carbonate (DEC), dimethyl carbonate (DMC) and ethylene carbonate (EC); the diluent is 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether (HFE), and the diluent is 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether (HFE); lithium hexafluorophosphate (LiPF6); the film-forming additive is LiDFOB lithium difluoro (oxalato) borate; a film forming additive tri (trimethylsilyl) phosphate TMSP; and lithium nitrate LiNO3. The method provided by the invention is simple and easy to implement and low in cost, and the obtained electrolyte shows excellent specific capacity, charge-discharge cycle stability and rate capability as an electrode material of a lithium ion battery and a sodium ion battery.

The invention discloses a high-voltage sodium ion battery electrolyte for a high-specific-energy O3 type layered oxide positive electrode, and relates to the technical field of sodium ion battery electrolyte preparation. Comprising sodium salt, an organic solvent and an additive, the sodium salt is sodium hexafluorophosphate; the organic solvent is propylene carbonate, diethyl carbonate and ethyl methyl carbonate; the additive comprises a self-cleaning additive and a film-forming additive. The electrolyte is suitable for an O3 type layered oxide positive electrode system with the working voltage as high as 4.2 V. The system has good interface stability, oxidation inhibition capability and whole-process protection mechanism, so that side reaction and gas generation are effectively inhibited, the safety of the sodium ion battery under high voltage is improved, and the cycle life of the sodium ion battery under high voltage is prolonged. And meanwhile, the constructed electrolyte system is reasonable in formula, raw materials are easy to obtain, and good cost control and commercialization amplification prospects are achieved. The problem that an interface of an existing traditional electrolyte is unstable under the high-voltage condition is solved.

Carbonate compounds are excellent additives of oxygen-containing fuel, and play an important role in improving the oxygen content of fuel. The present application mainly relates to a preparation method of a catalyst for synthesizing carbonate additives. The catalyst is used for catalyzing the preparation of a mixture of methyl ethyl carbonate and diethyl carbonate by means of an ester exchange reaction with dimethyl carbonate and ethanol as raw materials. The mixture obtained after the reaction is used as an oxygen-containing fuel additive. The catalyst is characterized in that the catalyst is a high-efficiency ester exchange catalyst with a multistage-pore ZSM-5 molecular sieve as a carrier, a double-molecule as a connecting agent and an alcohol salt as an active component. In the preparation process of the catalyst, the connecting agent is added. The connecting agent has the advantages of increasing the stability of the sodium alcoholate active component and increasing the loading capacity by using a molecular connecting agent with multiple active groups. The performance of the catalyst is evaluated by using a tank reactor, and the stability of the prepared catalyst in the ester exchange reaction is investigated. The performance evaluation shows that the catalyst prepared by using the connecting agent has higher product yield and more excellent product yield. This has important significance for improving the combustion performance of the oxygen-containing fuel and reducing the fuel cost.

The invention relates to the technical field of synthesis of high molecular material sulfone polymers, in particular to a halogen-free environment-friendly end-capping reagent and a method for carrying out end capping on sulfone polymers by using the halogen-free environment-friendly end-capping reagent. At least one halogen-free environment-friendly end-capping reagent selected from methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, trimethyl carbonate, propylene carbonate and ethylene carbonate is introduced; and at least one ionic liquid selected from the group consisting of 1-ethyl-3-methylimidazole acetate, 1-ethyl-3-methylimidazole methane sulfonate, tetrabutylammonium p-toluenesulfonate and choline acetate is used as a catalyst. According to the method, the problems of environmental pollution and toxic residues caused by a traditional halogen end-capping reagent are effectively avoided. The invention also keeps the bisphenol monomer slightly excessive. And the prepared polysulfone resin has the advantages of obviously enhanced terminal group stability, pure color, high transparency and low chlorine content, and is suitable for the high value-added application fields of medical instruments, food contact materials, electronic devices and the like.

The invention discloses a wide-temperature-range electrolyte and application thereof, and belongs to the technical field of supercapacitors. The wide-temperature-range electrolyte comprises the following components in percentage by mass: 12.5%-15% of lithium salt, 0.3%-1% of [2, 2 '-dinaphthalene]-7-yl trifluoromethanesulfonate, 0.5%-1.5% of a sulfur additive, 0.5%-1% of a lithium salt additive and the balance of an organic solvent, by taking the total volume of the organic solvent as 100%, the volume ratio of the 2-bromo-5-fluoroisonicotinic acid methyl ester to the total volume of the ethylene carbonate and the propylene carbonate to the diethyl carbonate to the ethyl methyl carbonate is (5-10): (10-15): (10-20): (50-65). Experiments prove that by adding the methyl 2-bromo-5-fluoroisonicotinate and the functional [2, 2 '-dinaphthalene]-7-yl trifluoromethanesulfonate into the electrolyte, the high and low temperature discharge performance, especially the low temperature performance, of the supercapacitor can be remarkably improved, and the highest discharge capacity retention rate at-20 DEG C is 84.5%. Therefore, the wide-temperature-range electrolyte prepared by the method can solve the problem that a traditional supercapacitor electrolyte is difficult to consider high and low temperature performance at the same time.

The invention discloses a method for preparing a lithium battery by using a dual-channel crystalline framework composite quasi-solid electrolyte. The preparation method comprises the following steps: firstly, preparing a zinc-based tetrazole biphenyl dicarboxylic acid metal organic framework material by adopting a solvothermal method, blending the zinc-based tetrazole biphenyl dicarboxylic acid metal organic framework material with a polymer, and then obtaining the metal organic framework composite polymer lithium ion battery electrolyte material by adopting an electrostatic spinning technology. The preparation method comprises the following steps: dissolving butyl acrylate and lithium salt in a mixed solvent of ethylene carbonate, diethyl carbonate and fluoroethylene carbonate, adding a thermal initiator to obtain a gel polyelectrolyte precursor, assembling a lithium ion battery by using the diaphragm material, and heating to generate in-situ polymerization inside the battery. Under the room temperature condition, after the prepared battery is circulated for 60 circles under the rated capacitance of 0.2 C, the specific discharge capacity is 158 mAh / g, and the coulombic efficiency is kept at about 99%; the interface stability is good in a cold environment; the preparation process is low in energy consumption, low in cost and suitable for large-scale industrial production.

The invention relates to a non-aqueous electrolyte and a sodium ion battery, the non-aqueous electrolyte comprises an organic solvent, a sodium salt and an additive, the organic solvent comprises a strong coordination solvent and a weak coordination solvent, the strong coordination solvent is selected from at least one of ethylene carbonate, propylene carbonate and vinylethylene carbonate; the weak coordination solvent is selected from at least one of methyl ethyl carbonate, diethyl carbonate, methyl trifluoroethyl carbonate, 2, 2-difluoroethyl carbonate, ethyl trifluoroethyl carbonate and di (2, 2, 2-trifluoroethyl) carbonate; the volume ratio of the strong coordination solvent to the weak coordination solvent is (0.5-2.5): 1; the additive is selected from at least one of lithium difluoro (oxalato) borate and sodium difluoro (oxalato) borate. The dissolving capacity of the non-aqueous electrolyte to positive and negative electrode interface layers of the sodium-ion battery is obviously reduced, the stability of an SEI film can be effectively improved, and the first coulombic efficiency and cycling stability of the sodium-ion battery at high temperature and room temperature are improved.

The invention belongs to the technical field of materials, and provides an electrolyte for a high-capacity spinel positive electrode lithium ion battery, a preparation method of the electrolyte and the lithium ion battery. The electrolyte comprises a lithium salt and a carbonic ester mixed solvent, and the mixed solvent is composed of ethylene carbonate, diethyl carbonate, (2, 2, 2-trifluoroethyl) ethyl carbonate and bis (2, 2, 2-trifluoroethyl) carbonate. According to the invention, the combination of solvents is regulated and controlled, a high-inertia fluorinated structure on one side of a molecule and a non-fluorinated structure for promoting solvation on the other side of the molecule are innovatively combined, and the combination of asymmetric and symmetric fluorinated solvents is adopted, so that the advantages of high stability of a fluorinated electrolyte and strong solvation and ionic conduction of a non-fluorinated electrolyte are integrated, and the limitation of the fluorinated electrolyte and the non-fluorinated electrolyte is made up. The electrolyte adapts to a high-low voltage interface charging and discharging process, is well matched with a spinel positive electrode, and can be matched with the circulation interface characteristic, so that the super-theoretical capacity circulation is realized, the energy density is improved, the service life is prolonged, and the battery has a high circulation capacity retention rate.

The invention relates to the technical field of organic synthesis and biochemical engineering, and discloses a preparation method of 3-o-ethyl ascorbic acid, which comprises the following steps: (1) carrying out pre-acetylation reaction on ascorbic acid and vinyl acetate under the catalysis of lipase to obtain 6-acetyl ascorbic acid; (2) carrying out ethylation reaction on the product in the step (1) and diethyl carbonate by taking ionic liquid as a catalyst; (3) purifying the product by combining supercritical COextraction with membrane filtration; according to the preparation method of the 3-o-ethyl ascorbic acid provided by the invention, the purity and the yield of the product are remarkably improved through a synergistic process of lipase pre-acetylation, ionic liquid catalytic ethylation and supercritical COextraction combined with membrane filtration and purification; 6-hydroxyl of ascorbic acid can be selectively protected. The step utilizes the specific catalysis function of the enzyme to avoid the non-selective reaction of other hydroxyl groups.

An electrolyte, a battery cell, and a vehicle with a vehicle battery is provided. The electrolyte includes a ternary salt, dual-cyclic solvents, a linear carbonate solvent, and quaternary additives. The ternary salt includes lithium hexafluorophosphate (LiPF6), lithium bis(fluorosulfonyl)imide (LiFSI), and lithium difluoro(oxalate)borate (LiDFOB). The dual-cyclic solvents include ethylene carbonate (EC) between 0-30% by volume and fluoroethylene carbonate (FEC) between 0-30% by volume. The linear carbonate solvent includes at least one of ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), or diethyl carbonate (DEC). The linear carbonate solvent is between 60-80% by volume. The quaternary additives include vinylene carbonate (VC) between 0.5-2% by weight, trimethylsilyl (TMSi) between 0.25-1% by weight, bis(2,2,2-trifluoroethyl) carbonate (DFDEC) between 0.5-2% by weight, and succinic anhydride (SA) between 0.25-1% by weight.

The invention relates to the technical field of batteries, in particular to an electrolyte without ethylene carbonate and a battery. The electrolyte comprises fluoroethylene carbonate, diethyl carbonate, propylene carbonate and a compound A, and the compound A is at least one of ethyl propionate and propyl propionate; based on the total mass of the electrolyte, the mass content w1 of the fluoroethylene carbonate is 10-30%; the mass content w5 of the diethyl carbonate is 5%-25%; the content w6 of the propylene carbonate is 5%-28%; the mass content of the compound A is w2, and w2 is 25%-60%; under the condition that the compound A is a combination of ethyl propionate and propyl propionate, the mass content of ethyl propionate is greater than that of propyl propionate; and 1.04 < = w1 / w5 < = 3.5. Comprising the electrolyte provided by the invention is improved in high-temperature stability, dynamic performance and cycle performance.

Electrolyte composition for batteries, the electrolyte composition comprising: ethylene carbonate; Diethyl carbonate; Ethyl methyl carbonate; vinylethylene carbonate; vinyl carbonate; Propane-1,3-sultone; ethylene sulfate; and lithium difluorophosphate; and wherein the ethylene carbonate, the diethyl carbonate and the ethyl methyl carbonate are each present in the electrolyte composition in an amount of 10 parts by weight to 50 parts by weight based on 100 parts by weight of the electrolyte composition; wherein the ethylene carbonate, the diethyl carbonate and the ethyl methyl carbonate are present in a ratio of 1:1:1; wherein the vinylethylene carbonate is present in the electrolyte composition at 0.5 parts by weight based on 100 parts by weight of the electrolyte composition; wherein the vinyl carbonate is present in the electrolyte composition at 1.0 part by weight based on 100 parts by weight of the electrolyte composition; and wherein the propane-1,3-sultone is present in the electrolyte composition at 1.5 parts by weight based on 100 parts by weight of the electrolyte composition.

The present application relates to an electrochemical device comprising a positive electrode comprising a positive electrode current collector and a positive electrode active material layer on at least one surface of the positive electrode current collector, the positive electrode active material layer comprising a positive electrode active material, the positive electrode active material comprising a nickel-containing material, the weight percentage of the nickel-containing material is not less than 70%; the electrolyte comprises lithium bis (fluorosulfonyl) imide and lithium hexafluorophosphate, based on the total weight of the electrolyte, the weight percentage content of the lithium bis (fluorosulfonyl) imide is a%, the weight percentage content of the lithium hexafluorophosphate is b%, a + b is more than 12 and less than 20, a / b is more than 0.2 and less than 0.75, and the electrolyte further comprises a first compound, the first compound comprises at least one of methyl ethyl carbonate or diethyl carbonate, the weight percentage content of the first compound is c% based on the total weight of the electrolyte, and c is smaller than 10.

The utility model discloses a diethyl carbonate loading cooling and heat preservation device which comprises a bottom plate, a plurality of first cooling plates transversely arranged at the top end of the bottom plate, a plurality of second cooling plates longitudinally arranged at the top end of the bottom plate, a first water inlet pipe and a first water outlet pipe, the first water inlet pipe and the second water outlet pipe are connected with each second cooling plate, the first water outlet main pipe is connected with the first water outlet pipes jointly, the second water outlet main pipe is connected with the second water outlet pipes jointly, and the first water inlet main pipe is connected with the water inlet ends of the first water inlet pipes jointly. The first water inlet main pipe is connected with the water inlet ends of the first water inlet pipes, the second water inlet main pipe is connected with the water inlet ends of the second water inlet pipes, the first water tank is connected with the first water outlet main pipe and the second water outlet main pipe, the cooler is connected with the first water tank, and the first water inlet main pipe and the second water inlet main pipe are both connected with the second water tank. According to the utility model, the purpose of cooling and heat preservation when diethyl carbonate is loaded and transported can be achieved.

The invention provides a preparation method of diethyl malonate and a preparation method of valproic acid, and belongs to the technical field of organic synthesis. According to the method, diethyl carbonate and ethyl acetate are taken as initial raw materials, the ethyl acetate has three alpha-H and loses one alpha-H under the attack of strong base, so that ethyl acetate enol negative ions are formed, and ethyl acetate carbon negative ions are obtained through rearrangement; carrying out nucleophilic addition on carbonyl of diethyl carbonate by using the ethyl acetate carbon negative ions to obtain an addition intermediate, and then removing ethanol negative ions from the addition intermediate to obtain diethyl malonate; by controlling the reaction temperature, ethanol generated in the reaction process is continuously distilled out, so that the reaction is carried out in the forward direction, and side reactions are reduced to the greatest extent; as the condensation catalyst used in the invention has strong nucleophilicity and alkalinity, the use of the aprotic solvent can avoid the consumption of the condensation catalyst by the solvent.

The invention belongs to the technical field of lithium ion battery electrolytes, and particularly relates to a non-combustible electrolyte for a silicon negative electrode lithium ion battery and a preparation method of the non-combustible electrolyte, the non-combustible electrolyte comprises a lithium salt and a mixed solvent, the mixed solvent comprises ethyl 1, 1, 2, 3, 3, 3-hexafluoropropyl ether, diethyl carbonate and fluoroethylene carbonate, ethyl 1, 1, 2, 3, 3, 3-hexafluoropropyl ether, diethyl carbonate and fluoroethylene carbonate, and ethyl 1, 1, 2, 3, 3, 3-hexafluoropropyl ether, diethyl carbonate and fluoroethylene carbonate are added into the mixed solvent. The volume ratio of the 1, 1, 1, 3, 3-hexafluoropropyl ether to the diethyl carbonate to the fluoroethylene carbonate is (3-20): (2-5): (1-5). According to the invention, the cycle life and the safety performance of the silicon-based negative electrode battery are remarkably improved, and the method has important significance for promoting the development of high-energy-density batteries.

The invention discloses a sodium ion battery capable of improving rapid charging performance, performance breakthrough is realized through common optimization design of multiple components of positive and negative electrode materials, a diaphragm and electrolyte, and the positive electrode material is composed of sodium nickel iron manganese oxide, polyvinylidene fluoride, conductive carbon black and carbon nanotubes; a negative electrode material adopts a hard carbon material matched with a conductive agent and a composite binder, and the binder comprises sodium carboxymethyl cellulose, 3-(5-(2-nitrophenyl)-2-furan) acrylic acid and 4-(hydroxymethyl) phenylboronic acid pinacol ester; the diaphragm is a ceramic coating polyvinyl base membrane, the electrolyte takes sodium hexafluorophosphate as an electrolyte and is matched with an electrolyte additive and a composite solvent, and the electrolyte additive comprises three to five of sodium bis (fluorosulfonyl) imide, sodium difluorophosphate, sodium difluoro (oxalato) borate, ethylene sulfate, fluoroethylene carbonate and ethylene sulfite. The composite solvent comprises methyl ethyl carbonate, propylene carbonate and diethyl carbonate.

Electrolyte blends for lowering resistance and enhancing charge-discharge cycle life in lithium-ion batteries (LiB) containing silicon include a lithium additive in a solvent. The solvent may include diethyl carbonate (DEC) and / or lithium difluorooxalatoborate (LiDFOB).

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 discloses an ultrahigh-temperature long-cycle sodium-ion battery electrolyte, which belongs to the technical field of sodium-ion batteries, and comprises a sodium salt, an additive and an organic solvent, the sodium salt comprises sodium hexafluorophosphate and sodium bis (fluorosulfonyl) imide, and the proportion of the sodium bis (fluorosulfonyl) imide is 0.6 to 0.8; the additives comprise fluoroethylene carbonate, vinylene sulfate, sodium difluorophosphate, sodium bis (oxalato) borate and methylene methanedisulfonate; the organic solvent comprises ethylene carbonate, propylene carbonate, diethyl carbonate and ethyl methyl carbonate. According to the sodium-ion battery electrolyte disclosed by the invention, the proportion of the composite sodium salt is precisely regulated and controlled, and the composite sodium salt and the additive form a synergistic effect to generate a high-temperature-resistant SEI film rich in inorganic components, so that the side reaction of the battery at a high temperature is reduced, and the high-temperature cycle life of the battery is greatly prolonged.

The invention relates to the technical field of organic synthesis, in particular to a method for co-producing methyl ethyl carbonate and diethyl carbonate through homogeneous catalysis, which comprises the following steps: by taking organic sulfonate of 0.5-10% bordering acid metal ions as a catalyst, reacting for 6-9 hours at 73-80 DEG C according to the molar ratio of dimethyl carbonate to ethanol being 1: (5-12); and carrying out atmospheric distillation on the reacted material, and collecting a fraction at 64-130 DEG C to obtain a mixed fraction containing the ethyl methyl carbonate and the diethyl carbonate. According to the technical scheme, the catalyst is superior to an existing catalyst in the aspects of catalytic activity, compatibility and stability, ester exchange can be efficiently catalyzed to co-produce ethyl methyl carbonate and diethyl carbonate, it is ensured that the yield of ethyl methyl carbonate is higher than that of diethyl carbonate, and a series of problems existing in the existing catalyst can be solved.