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

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

Disclosed herein is an electrolyte solution comprising: (a) about 5 wt % to about 60 wt % of a fluorinated ester; (b) greater than 0 wt % to less than 100 wt % of at least one solvent selected from fluoroethylene carbonate, difluoroethylene carbonate, ethyl methyl carbonate, dimethyl carbonate, diethyl carbonate, methyl (2,2,2-trifluoroethyl) carbonate, propylene carbonate, trifluoropropylene carbonate, butylene carbonate, methyl acetate (MA), ethyl acetate (EA), methyl propanoate (MP); (c) at least one salt; wherein the wt % is calculated based on a total weight of a) and b); and wherein the electrolyte solution is substantially free of ethylene carbonate (EC). Also disclosed are batteries comprising such electrolytes. Also disclosed are methods of making the disclosed herein electrolytes and batteries.

The invention discloses a 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.

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.

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 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.

This invention discloses a device and process for improving methanol utilization in carbonate production, belonging to the field of carbonate production technology. Dimethyl carbonate and ethanol are introduced into a reaction tower and reacted under the action of catalyst a to produce ethyl methyl carbonate, diethyl carbonate, and methanol as a byproduct. The atmospheric pressure azeotrope is distilled off from the top of the reaction tower and enters a pressurized tower for separation. Another atmospheric pressure azeotrope, with a mass ratio of dimethyl carbonate to methanol of 1:2.3-3.3, distilled off from the DMC reaction tower, also enters the pressurized tower. The ratio of dimethyl carbonate to methanol azeotrope is changed by increasing the operating pressure. Dimethyl carbonate collected from the bottom of the pressurized tower is sent to the EMC reaction tower as a raw material using pressure differential. The pressurized azeotrope, with a mass ratio of dimethyl carbonate to methanol of 1:8-9.5, distilled off from the top of the pressurized tower, is sent to the DMC reaction tower as a raw material. This invention solves the technical problem of low methanol utilization in existing processes and is mainly applied to carbonate production.

The invention relates to an exterior material for a power storage device, a sealant film, an exterior case for a power storage device, and a power storage device. The present invention addresses the problem of providing an exterior material for a power storage device, which has high sealing strength and is capable of suppressing the generation of air bubbles. An exterior material for a power storage device, in which a base material layer, a barrier layer, an adhesive layer, and a sealant layer are laminated in this order, at least one layer included in the adhesive layer and the sealant layer is a layer having a degree of swelling in an electrolyte solution satisfying 12%-40%, and the electrolyte solution is a mixed solution in which diethyl carbonate (DEC) / propyl propionate (PrPr) in a mass ratio of 1: 1.

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.