21 results about "Methyl carbonate" patented technology

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 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.

This disclosure provides a battery cell, a battery device, and an electrical device. The battery cell includes a casing and an electrode assembly located within the casing. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The separator is located between the positive and negative electrode. The negative electrode includes a negative current collector and a negative electrode film layer located on at least one side of the negative current collector. The porosity of the negative electrode film layer is 20-35%. The negative electrode film layer includes a negative electrode active material, which includes silicon-based materials and carbon-based materials. The mass percentage of Si element in the negative electrode film layer is 1-10%, and the volume distribution particle size Dv50 of the negative electrode active material is 10-20 μm. The battery cell includes an electrolyte, which includes an organic solvent and an electrolyte salt. The organic solvent includes ethyl methyl carbonate, and the mass percentage of ethyl methyl carbonate in the organic solvent is greater than or equal to 55% and less than 100%. The battery cell exhibits both high energy density and good low-temperature cycling performance.

An electrolyte. The electrolyte comprises a fluorine-containing ester additive. The ratio of the fluorine-containing ester additive in the electrolyte is 2-9% by mass percentages. The fluorine-containing ester additive comprises 2,2-difluoroethyl acetate, difluoroethylene carbonate and trifluoroethyl methyl carbonate.

The application provides a high-safety high-conductivity electrolyte as well as a preparation method and application thereof, and relates to the technical field of lithium batteries.The raw materials of the electrolyte include a lithium salt, an organic solvent and a flame retardant, the flame retardant includes hexa (2, 2, 2-trifluoroethoxy) cyclotriphosphazene and 2, 2, 3, 3-tetrafluoropropyl methyl carbonate with a mass ratio of 1:2-3, and the mass percentage of the flame retardant in the raw materials is 5-12%. The electrolyte can not only solve the flammable problem of traditional electrolytes, improve the flame retardant performance and safety of the electrolyte, but also improve the ionic conductivity, prolong the cycle life of the battery under high temperature, and improve the high-temperature stability of the battery.

This application provides a method for efficient alkaline separation of low-grade tungsten-tin ore, comprising: placing a mixture of sodium hydroxide solution and low-grade tungsten-tin ore in a high-pressure reactor for pressurized and heated leaching; after leaching, cooling and filtering to obtain detungsten-removed slag and leachate; performing countercurrent extraction of the leachate using an extractant, wherein the oil-water ratio of the leachate to the extractant is 1 / 10 to 1 / 1; and obtaining a loaded organic phase and raffinate after phase separation, wherein the extractant comprises: 10-40 wt% methyl carbonate quaternary ammonium salt, 5-15 wt%... Isooctyl alcohol or 2-octanol (wt%) was used as a phase modifier and kerosene as a diluent. The loaded organic phase was first washed countercurrently with 5-30 g / L sodium hydroxide solution, and after phase separation, the washed organic phase and washing solution were obtained. The washed organic phase was back-extracted with a mixed solution of 1-4 mol / L ammonium bicarbonate and 0.5-3 mol / L ammonia water to obtain a back-extraction solution, wherein the oil-water ratio was 10 / 1-30 / 1. The back-extraction solution was de-oiled using resin. The de-oiled back-extraction solution was directly evaporated and crystallized to obtain ammonium paratungstate product and crystallization mother liquor.

This application relates to a battery and an electrical device. The battery includes a positive electrode, a negative electrode, a separator, and an electrolyte; the positive electrode active material layer includes aluminum; the separator includes an oxide solid electrolyte coating; the electrolyte includes a solvent, an additive, and a lithium salt; the solvent includes a first solvent and a second solvent; the additive includes a first additive and a second additive; the first solvent includes propylene carbonate and / or ethylene carbonate, and the second solvent includes ethyl 2,2-difluoroacetate and / or trifluoroethyl methyl carbonate; the first additive includes mannitol sulfate, and the second additive includes ethylene sulfate; 0.08≤(A+C+D)×10000 / X≤0.77; 0.05≤(C+D)×100 / (B+W)≤2.77; 3.23≤(C+H) / B≤63.97. The solution provided in this application results in a battery exhibiting excellent thermal shock safety and high and low temperature cycling performance.

A non-aqueous electrolyte includes chain carbonates and cyclic carbonates, where the chain carbonates include dimethyl carbonate, ethyl methyl carbonate, and diethyl carbonate, and the cyclic carbonates include at least one of ethylene carbonate and propylene carbonate; and based on a total mass of the non-aqueous electrolyte, a mass percentage of dimethyl carbonate is M1%, where 0.001≤M1≤0.1; a mass percentage of ethyl methyl carbonate is M2%, where 15≤M2≤60; a mass percentage of diethyl carbonate is M3%, where 5≤M3≤35; a mass percentage of ethylene carbonate is M4%, a mass percentage of propylene carbonate is M5%, and 20≤M4+M5≤40.

A battery that cycles lithium ions includes a positive electrode and a liquid electrolyte infiltrating the positive electrode. The electrolyte includes an organic solvent mixture, a primary lithium salt, a fluoroborate salt, a phosphite additive, and a solid electrolyte interphase (SEI)-forming additive in the organic solvent mixture. The organic solvent mixture includes ethylene carbonate and ethyl methyl carbonate. The fluoroborate salt constitutes, by weight, greater than or equal to 0.1% and less than or equal to 2% of the electrolyte. The phosphite additive constitutes, by weight, greater than or equal to 0.01% and less than 3% of the electrolyte. The positive electrode includes an electroactive material comprising a layered lithium-rich and manganese-based transition metal oxide (LRMO).

The present invention provides a lithium secondary battery including a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte, wherein the positive electrode includes a positive electrode active material, the positive electrode active material includes lithium iron phosphate particles, the loading amount of the positive electrode is 450 mg / 25 cm 2 to 740 mg / 25 cm 2 , the non-aqueous electrolyte includes a lithium salt, an organic solvent, and an additive, wherein the organic solvent includes 10 to 35% by volume of ethylene carbonate, 5 to 55% by volume of dimethyl carbonate, and 20 to 70% by volume of ethyl methyl carbonate, and the volume ratio of the cyclic carbonate-based solvent to the linear carbonate-based solvent is 10:90 to 35:65, the additive includes vinylene carbonate, and the weight ratio of the vinylene carbonate to the dimethyl carbonate is greater than 0 to 0.2 or less. By improving the negative electrode reduction stability while improving the impregnation properties of the positive electrode to the non-aqueous electrolyte, the lithium secondary battery has excellent capacity performance effects, excellent life performance, and resistance reduction effects.

Improved electrolytes for lithium-based cells can include a dual salt combination of lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide or lithium bis(trifluoro-methanesulfonyl)imide, and a solvent that includes dimethyl carbonate, ethylmethyl carbonate and 5 to 25 volume percent of fluoroethylene carbonate. The improved electrolytes can include additives triethyl phosphate, ethoxy(pentafluoro)cyclotriphosphazene, 1,3-propane sultone, or mixtures thereof, and have small limited amounts of additional cosolvents and / or lithium-free organic additives. The improved electrolytes can be used to prepare lithium-based cells with silicon-based active materials as negative electrodes and nickel rich lithium metal oxides as positive electrodes. The lithium-based cells can achieve high energy, high power, fast charge and long cycle life along with good thermal stability.

The application discloses a kind of sulfuryl amino methyl carbonate base modified substituted benzamide urea new compounds and preparation method thereof, belong to heterocyclic compound technical field. With the key intermediate 4-[2-(2-amino-4(3H)-oxo-7H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoic acid of synthesizing pemetrexed disodium as mother nucleus, using NHS / EDC system activation mother nucleus carboxyl, make it react with the modifier containing free amino, so as to introduce glutamic acid recognition site and hydrophobic sulfuryl amino methyl carbonate tert-butyl ester fragment in structure;Modifier is lysine as connecting chain, glutamic acid and lysine are connected by amide bond, chlorosulfonyl amino methyl carbonate tert-butyl ester is grafted to lysine side chain by nucleophilic substitution reaction, while retaining pemetrexed recognition site, improve the hydrophobicity of molecular structure.

The invention relates to an electrochemical cell comprising: —at least one anode comprising metallic lithium or a lithium alloy or at least one anode comprising a current collector at least partially covered with metallic lithium deposited after at least one charge of the cell, the cell not containing metallic lithium at the time of its manufacture, —at least one cathode, —a liquid or gelled electrolyte composition comprising: a) a solvent comprising: i) either a mixture of 1,1,1,3,3,3-hexafluoro-2-methoxypropane (HFMP) and / or 1,1,1,3,3,3-hexafluoro-2-(fluoromethoxy)propane (HFMFP), ethylene monofluorocarbonate (F1EC) and 2,2,2-trifluoroethyl methyl carbonate (F3EMC), ii) or a mixture of 1,1,1,3,3,3-hexafluoro-2-methoxypropane (HFMP) and / or 1,1,1,3,3,3-hexafluo-ro-2-(fluoromethoxy)propane (HFMFP), ethylene monofluorocarbonate (F1EC) and 2,2,2-trifluoroethyl acetate (F3EA), b) at least one salt whose cation is the lithium cation, c) lithium difluorophosphate LiPO2F2 in an amount representing from 0.05 to 5% of the mass of the combination made up of the solvent and said at least one dissolved lithium salt.

The application provides a lithium ion battery. The lithium ion battery comprises a positive electrode active material layer and an electrolyte; the material of the positive electrode active material layer comprises a high-nickel positive electrode active material, wherein the molar content of nickel is greater than or equal to 80 mol% based on 100 mol% of the molar content of transition metal elements; the electrolyte comprises a solvent and a lithium salt; the solvent comprises component A, ethylene carbonate, component B, dimethyl carbonate, component C, ethyl acetate and / or methyl propionate; and the conductivity of the electrolyte is greater than or equal to 12.50 mS / cm. The lithium ion battery with excellent performance is prepared by designing the specific composition of the electrolyte, the lithium ion transmission rate of the electrolyte system of the lithium ion battery can be significantly improved, the liquid phase transmission impedance and the interface impedance are reduced, the temperature rise of the battery during the rate discharge process is improved, and the use experience is improved.

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

This application relates to the field of battery materials, and specifically provides a battery. The battery includes a positive electrode sheet and an electrolyte. The electrolyte includes a non-fluorinated cyclic carbonate, ethyl methyl carbonate, and 1,2,4-butanetricarbonitrile. Based on the total mass of the electrolyte, the mass percentage of the non-fluorinated cyclic carbonate is f%, the mass percentage of the ethyl methyl carbonate is e%, and the mass percentage of the 1,2,4-butanetricarbonitrile is b%. Among them, f, e, and b satisfy: 7.5 ≤ e ≤ 57.5, 0.05 ≤ b ≤ 5, 0.003 ≤ b / e ≤ 0.3, and f < e. By adding a non-fluorinated cyclic carbonate, ethyl methyl carbonate, and 1,2,4-butanetricarbonitrile to the electrolyte and controlling the mass percentages and proportional relationships of the three, the high-temperature cycle performance, high-temperature and high-humidity storage stability, and low-temperature cycle performance of the battery can be significantly improved. It can be widely applied to various fields such as electronic devices, drones, and electric vehicles.

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.

This invention discloses a lithium-ion battery electrolyte with high ionic conductivity and its preparation method, belonging to the field of lithium-ion battery material technology. First, an amino-cerium-based MOF is synthesized via a solvothermal method. Then, sulfonic acid groups are grafted through an amidation coupling reaction. An ionic liquid is then loaded into the pores of the MOF using an impregnation method to obtain a composite additive. Finally, this composite additive, lithium bis(fluorosulfonyl)imide, ethylene carbonate, dimethyl carbonate, and ethyl methyl carbonate are mixed under an inert atmosphere to obtain a lithium-ion battery electrolyte with high ionic conductivity. This invention combines the confined ion transport of the MOF, the dissociation-promoting properties of the sulfonic acid groups, and the low-temperature fluidity of the ionic liquid to synergistically improve the ionic conductivity and interfacial stability of the electrolyte at low temperatures. This solves the problems of low low-temperature ionic conductivity and rapid capacity decay of traditional electrolytes, meeting the urgent need for high-performance, long-life lithium-ion batteries under extreme low-temperature conditions.

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.

This disclosure provides an electrolyte, a battery cell, and a vehicle having a vehicle battery. The electrolyte comprises a ternary salt, a bicyclic solvent, a linear carbonate solvent, and a quaternary additive. The ternary salt comprises lithium hexafluorophosphate (LiPF6), lithium bis(fluorosulfonyl)imide (LiFSI), and lithium difluoro(oxalate)borate (LiDFOB). The bicyclic solvent comprises 0-30 vol% ethylene carbonate (EC) and 0-30 vol% fluoroethylene carbonate (FEC). The linear carbonate solvent comprises at least one selected from ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), or diethyl carbonate (DEC). The linear carbonate solvent comprises 60-80 vol%. The quaternary additive comprises 0.5-2% by weight vinylene carbonate (VC), 0.25-1% by weight trimethylsilyl (TMSi), 0.5-2% by weight bis(2,2,2-trifluoroethyl) carbonate (DFDEC), and 0.25-1% by weight succinic anhydride (SA).