113 results about "Ethyl carbonate" patented technology

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, the electrode assembly comprises a positive pole piece, the positive pole piece comprises a positive active material layer, and the positive active material layer comprises lithium-containing phosphate of an olivine structure; the electrolyte comprises, by mass, 8-30% of a carboxylic ester solvent, a lithium salt and an unsaturated ester additive, the lithium salt comprises lithium hexafluorophosphate and fluorine-containing lithium sulfimide, the mass content of the fluorine-containing lithium sulfimide in the lithium salt is 18-45%, the mass content of the unsaturated ester additive in the electrolyte is 0.05-5%, and the mass content of the unsaturated ester additive in the electrolyte is 0.05-5%. The unsaturated ester additive comprises one or more of vinylene carbonate, vinylethylene carbonate, allyl ethyl carbonate and a fluoro-carbonate additive; the amount of electrolyte in the battery cell is 2.8 g / Ah to 3.2 g / Ah. According to the invention, rapid charging and use reliability of the single battery can be considered.

The invention provides a low-temperature electrolyte, positive electrode slurry and a low-temperature sodium ion battery, and belongs to the technical field of battery materials. The low-temperature electrolyte provided by the invention comprises sodium hexafluorophosphate, propylene carbonate, ethylene carbonate, dimethyl carbonate, methyl ethyl carbonate, fluoroethylene carbonate, 2, 2, 3, 4, 4, 4-hexafluorobutyl acrylate and 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether. The battery provided by the invention comprises the low-temperature electrolyte. The low-temperature electrolyte and the low-temperature sodium-ion battery provided by the invention not only can be compatible with a blended positive electrode material, but also can give consideration to low-temperature performance, ensure that the prepared low-temperature sodium-ion battery has good reaction kinetics and cycle performance, and also can improve the energy density of an electrode and reduce the resistivity of powder.

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 belongs to the technical field of secondary batteries, and particularly relates to an electrolyte and a preparation method thereof and a secondary battery, the electrolyte comprises an organic solvent, a lithium salt and an additive, the mass of the organic solvent accounts for 80-93% of the total mass of the electrolyte, and the mass of the lithium salt accounts for 6-15% of the total mass of the electrolyte. The mass of the additive accounts for 1-8% of the total mass of the electrolyte; wherein the organic solvent comprises a linear carbonic ester solvent and a cyclic carbonic ester solvent, the mass of the linear carbonic ester solvent accounts for 60%-85% of the total mass of the organic solvent, and the mass of the cyclic carbonic ester solvent accounts for 15%-40% of the total mass of the organic solvent. Compared with the prior art, the electrolyte provided by the invention has the advantages that the low-temperature performance of the battery can be remarkably improved under the condition that a large amount of propylene carbonate, methyl ethyl carbonate, carboxylic ester solvents and low-temperature additives are not required to be used by precisely regulating and controlling the mass ratio of the organic solvent to the lithium salt to the additives in the electrolyte.

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 the technical field of organic carbonate synthesis, in particular to a method for synthesizing methyl ethyl carbonate by using long-chain tertiary amine to catalyze ester exchange, which comprises the following steps: by taking 0.3-10% of long-chain tertiary amine as a homogeneous catalyst, reacting dimethyl carbonate with ethanol for 3-8 hours at 70-85 DEG C according to the mass part ratio of 1.6-10: 1 to prepare the methyl ethyl carbonate. The long-chain tertiary amine catalyst has no corrosion to equipment, is high in ester exchange catalytic activity and convenient to use, shows stability and water resistance superior to those of sodium alkoxide, and has relatively high cost performance.

The invention discloses a molecular sieve catalyst for synthesizing methyl ethyl carbonate by a transesterification method and a regeneration method, and relates to the technical field of molecular sieve catalysts, the molecular sieve catalyst comprises a microporous double-active-center inner core and an amphoteric mesoporous shell; the microporous double-active-center core takes the X-type zeolite as a carrier to load potassium, cesium, lanthanum and barium; the amphoteric mesoporous shell is an MCM-41 and SBA-15 composite mesoporous silica layer coating the outer part of the inner core and has a double-mesoporous structure, amino propyl triethoxy silane and carboxyethyl triethoxy silane are grafted on the surface of the amphoteric mesoporous shell, and zirconium and titanium are co-doped. According to the invention, collaborative optimization of active centers and mass transfer channels is realized through a core-shell structure of a microporous double-active-center core and an amphoteric mesoporous shell. The activity and selectivity of catalytic transesterification are remarkably improved by the microporous core; due to the double-mesoporous structure and surface functional modification of the amphoteric mesoporous shell, the mass transfer efficiency of reactants and products is improved, and the adaptability of the catalyst to a reaction system is enhanced.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, the electrode assembly comprises a positive pole piece, an isolating membrane and a negative pole piece, and the positive pole piece comprises lithium-containing phosphate with an olivine structure; the electrolyte comprises a linear carboxylic ester solvent, a cyclic carbonate solvent and an additive, wherein the viscosity of the linear carboxylic ester solvent at normal temperature is 0.4 mPa.s to 0.6 mPa.s; the cyclic carbonate solvent comprises at least one of ethylene carbonate and propylene carbonate; the additive comprises at least one of a borate additive, a sulfonate additive, a silane-based additive and an unsaturated ester additive, and the unsaturated ester additive comprises one or more of vinylene carbonate, vinylethylene carbonate, allyl ethyl carbonate and a fluoro-carbonate additive. And the mass content of the additive in the electrolyte is 0.5-6%. According to the invention, rapid charging and use reliability of the battery can be considered.

The invention discloses a novel solvent system-based low-temperature lithium battery electrolyte and a production process, the novel solvent system-based low-temperature lithium battery electrolyte comprises the following components: a carbonic ester solvent, a lithium salt combination and an additive, the carbonic ester solvent comprises ethylene carbonate, fluoroethylene carbonate, 1, 3-dioxolame and ethyl methyl carbonate, and the lithium salt combination comprises a lithium salt combination and an additive; the lithium salt combination is a mixed system of lithium bis (fluorosulfonyl) imide and lithium hexafluorophosphate, and the additives are vinylene carbonate, succinonitrile, lithium nitrate, triphenyl phosphate and aluminum trifluoromethanesulfonate; according to the low-temperature lithium battery electrolyte, the performance bottleneck of a traditional electrolyte at the temperature of-40 DEG C to-30 DEG C is broken through through multi-level cooperation of solvent-lithium salt-additive preparation of the low-temperature lithium battery electrolyte, the solvent maintains low viscosity while reducing the freezing point, and low-temperature high dissociation and interface stability are achieved through lithium salt compounding; the compatibility of the solid electrolyte interfacial film structure and current collection is finely regulated and controlled through the additive, and the application requirement in the extremely cold environment is met.

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 relates to a safety control method and system for the preparation of ethyl methyl carbonate (EMC). The method involves feeding dimethyl carbonate into an EMC purification tower, monitoring the pressure within the tower, and adjusting the pressure if it falls outside a preset range. The purity of the output dimethyl carbonate is also monitored. The output dimethyl carbonate, a sodium methoxide / methanol solution, and anhydrous ethanol are mixed in a specified ratio in a raw material mixing unit to achieve the required homogeneity. Pressure and temperature are monitored in an EMC reaction tower; if these requirements are not met, pressure or temperature is adjusted. The bottom liquid from the EMC reaction tower is transferred to a waste catalyst concentration tank for further processing, and then to an EMC light-weight removal tower for further treatment. Temperature and pressure are monitored within the EMC light-weight removal tower; if the pressure falls outside a preset range, pressure or temperature is adjusted. After cooling, the final EMC product is obtained. This process ensures safe and stable production of ethyl methyl carbonate.

The invention discloses an electrolyte for a lithium battery, which comprises an organic solvent, a lithium salt and an additive, and the mass percentage ratio of the organic solvent to the lithium salt to the additive is (70-90): (5-20): (0.2-10); the organic solvent is composed of cyclic carbonate and chain carbonate in a mass ratio of (10-30): (70-90); the lithium salt is one or more of lithium hexafluorophosphate, lithium perchlorate and lithium tetrafluoroborate; the additives comprise a high-temperature stabilizer, an antioxidant and a film-forming accelerant, the cyclic carbonate is one or two of ethylene carbonate and propylene carbonate, and the chain carbonate is one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate and methyl propyl carbonate. By optimizing the components of the electrolyte, the stability of the electrolyte at a high temperature is improved, and decomposition and side reactions are reduced, so that the performance of the battery in a high-temperature environment is improved, and the cycle life of the battery in a high-temperature environment is prolonged.

The invention provides an electrolyte, a lithium iron manganese phosphate battery and an electric device. The electrolyte comprises a lithium salt and a solvent, the solvent comprises ethylene carbonate, propylene carbonate, ethyl methyl carbonate, fluorobenzene and a low-viscosity solvent in a volume ratio of (2-5): (2-5): (3-5): (3-5): (2-5). The high dielectric constants of ethylene carbonate and propylene carbonate improve the dissolving capacity of the electrolyte to lithium salt, and meanwhile, the molecular structure can form a stable interface layer on the surface of a positive electrode to inhibit migration and dissolution of manganese ions; due to the low viscosity characteristic of the low-viscosity solvent, the overall viscosity of the electrolyte is reduced, and the permeability of the porous positive electrode material is enhanced, so that the wettability is improved, and uniform de-intercalation of lithium ions is promoted; a physical adsorption protection layer can be formed on the surface of the positive electrode through the coordination effect of high-electronegativity fluorine atoms in fluorobenzene and manganese, and direct contact between manganese and electrolyte is further blocked.

An electrolyte for a battery cell, a battery cell for a vehicle and a method of forming a battery cell. The electrolyte includes a combination of lithium ion salts including lithium hexafluorophosphate (LiPF6), lithium bis(fluorosulfonyl)imide, and lithium difluoro(oxalato)borate. The electrolyte also includes a carbonate solvent including fluoroethylene carbonate, ethyl methyl carbonate, and a carboxylic acid ester exhibiting the following formula:wherein R1 and R2 are individually an unsubstituted alkyl group including in the range of 1 carbon to 2 carbons, wherein the combination of lithium ion salts is dispersed in the carbonate solvent. The electrolyte further includes vinylene carbonate. The electrolyte does not include ethyl carbonate.

The invention relates to the technical field of batteries, and discloses an electrolyte and application thereof, and a lithium carbon fluoride battery. The electrolyte comprises a lithium salt and an organic solvent; wherein the lithium salt is lithium bis (fluorosulfonyl) imide; the organic solvent is selected from one of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene carbonate, propylene carbonate, dimethyl carbonate, ethyl methyl carbonate, dimethylformamide, dimethylacetamide and dimethyl sulfoxide. The electrolyte can be applied to preparation of a lithium primary battery. The invention also relates to a lithium carbon fluoride battery comprising the electrolyte. The electrolyte system provides an optimized solution for the preparation of the high-energy-density lithium carbon fluoride battery, has a wide application prospect, can remarkably improve the performance of the battery, reduces the production cost, and promotes the further development of the lithium carbon fluoride battery technology.

The application provides a low-temperature electrolyte, a positive electrode slurry and a low-temperature sodium ion battery, and belongs to the technical field of battery materials.The low-temperature electrolyte comprises sodium hexafluorophosphate, propylene carbonate, ethylene carbonate, dimethyl carbonate, methyl ethyl carbonate, fluoroethylene carbonate, 2,2,3,4,4,4-hexafluorobutyl acrylate and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether.The battery comprises the low-temperature electrolyte.The low-temperature electrolyte and the low-temperature sodium ion battery can not only be compatible with blended positive electrode materials, but also take into account the low-temperature performance, ensure that the prepared low-temperature sodium ion battery has good reaction kinetics and cycle performance, and can also improve the energy density of the electrode and reduce the powder resistivity.

The invention discloses an all-component recovery method and application of a waste lithium ion battery electrolyte, and belongs to the technical field of resource utilization of lithium ion batteries. The method comprises the following steps: disassembling the waste battery in a light mineral oil environment to realize safe and efficient electrolyte collection; then adding a weak base solution into the electrolyte for reaction, selectively precipitating and recovering high-purity lithium salt; and finally, separating and purifying the organic solvent component through two-step reduced pressure distillation to obtain dimethyl carbonate, methyl ethyl carbonate and ethylene carbonate. The method does not need inert gas protection, is simple in process flow, low in cost and high in safety, effectively solves the problems that the electrolyte is easy to volatilize, inflammable and easy to pollute, wastes resources and the like in the traditional recovery process, realizes efficient recovery and high-valued utilization of valuable components in the electrolyte, can be used for preparation of regenerated electrolyte, and is suitable for industrial production. The method has good economic benefits and environmental benefits.

The invention belongs to the technical field of gas sensor detection, and particularly relates to an EMC gas component prediction method based on a V2 / V2O5 / SnO2 sensor and GRU-Attention. The EMC gas component prediction method comprises the following steps: S1, preparing multiple layers of V2C MXene; s2, preparing a V2 / V2O5 / SnO2 composite material; s3, preparing a gas sensor; s4, measuring a resistance signal; and S5, establishing a GRU-Attention gas detection model. The V2C / V2O5 / SnO2 heterojunction gas-sensitive film is successfully synthesized, and the heterojunction provides a large number of adsorption and reaction sites for methyl ethyl carbonate molecules at a low temperature of 150 DEG C through a synergistic effect among high conductivity of V2C, excellent gas-sensitive characteristic of SnO2 and catalytic activity of V2O5; the sensor prepared by the invention has remarkably improved gas sensitive response, high response / recovery speed and low detection limit, and realizes efficient detection of EMC gas in a wide concentration range.

The present invention provides a manufacturing method for a positive electrode for a lithium secondary battery, including: a step of preparing a positive electrode in which a positive electrode active material layer containing lithium iron phosphate is formed on a current collector; and a step of adsorbing an organic solvent into the positive electrode active material layer, the organic solvent including one or more selected from the group consisting of N-methyl-2-pyrrolidone (NMP), acetone, ethanol, propylene carbonate, methyl ethyl carbonate, ethylene carbonate, and dimethyl carbonate.

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 invention discloses a low-temperature high-ionic-conductivity ether-ester composite sodium ion electrolyte and a preparation method thereof, and belongs to the technical field of energy storage battery materials, the electrolyte comprises ethylene glycol dimethyl ether, ethylene carbonate and methyl ethyl carbonate as basic solvents, and two brand-new modified compounds, namely methyl-2-(2, 2, 3, 3-tetrafluoropropoxy)-1, 2, 3, 4, 4-tetramethyl-1, 3, 4, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4- According to the invention, 2, 3-dioxolane-4-yl phosphonate and cyclo (2-hydroxypropyl-2 '-hydroxyethyl) sulfate are used as auxiliary materials, and fluoroethylene carbonate, sodium bis (fluorosulfonyl) imide and sodium perchlorate are used as auxiliary materials. Wherein the freezing point of fluoroether phosphonate is reduced through a fluorinated chain segment, and a phosphonic acid group promotes ion dissociation and stabilizes an interfacial film; the cyclic hydroxyl sulfonate inhibits molecular association through a cyclic structure, hydroxyl reduces the viscosity of a solvent, and sulfonate groups optimize the conductivity of an interfacial film. The prepared low-temperature high-ionic-conductivity ether-ester composite sodium ion electrolyte is high in ionic conductivity at low temperature, stable in interfacial film and long in cycle life.

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 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.

This invention provides a low-temperature electrolyte, its preparation method, and its application, belonging to the field of sodium battery technology. The low-temperature electrolyte provided by this invention comprises a basic electrolyte and NaPO₂F₂. The basic electrolyte includes NaPF₆, trimethyl phosphate (trimethyl silyl) ester, ethylene carbonate, propylene carbonate, and methyl ethyl carbonate; the mass ratio of NaPO₂F₂ to the basic electrolyte is 0.5:100 to 1.5:100; by mass percentage, ethylene carbonate accounts for 25-45%, propylene carbonate for 5-25%, methyl ethyl carbonate for 40-65%, and trimethyl phosphate (trimethyl silyl) ester for 0.5%-5%; the concentration of NaPF₆ in the basic electrolyte is 0.5 mol / L to 1 mol / L. The low-temperature electrolyte provided by this invention improves upon the slow desolvation process and unstable interfacial film formed by traditional carbonate-based electrolytes at low temperatures, and significantly improves the low-temperature discharge efficiency of sodium-ion batteries.

The application belongs to the technical field of new energy batteries, and particularly relates to a lithium ion battery. The lithium ion battery comprises a positive electrode, a negative electrode and a non-aqueous electrolyte; the positive electrode comprises a positive electrode active material comprising a lithium nickel manganese oxide material doped with a phosphorus element and / or coated with a phosphorus-containing compound; the non-aqueous organic solvent in the non-aqueous electrolyte comprises a first solvent and a second solvent; the first solvent comprises at least one of methyl trifluoroethyl carbonate, di(2,2,2-trifluoroethyl) carbonate, 2,2-difluoroethyl acetate and 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether; the second solvent comprises one or both of dimethyl carbonate and methyl ethyl carbonate; the lithium ion battery satisfies 0.1 <= 100E x (F / L) <= 12, 0.005 <= E <= 0.045, 5 <= F <= 50 and 10 <= L <= 60. The lithium ion battery provided by the application can realize the synergistic optimization of material structure stability and electrolyte performance, and has high conductivity and high oxidation resistance.

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 invention belongs to the technical field of semi-solid batteries, and particularly relates to a semi-solid electrolyte, a preparation method of the semi-solid electrolyte, a semi-solid battery and application of the semi-solid battery, a non-aqueous electrolyte contained in the semi-solid electrolyte comprises electrolyte salt, an additive and an organic solvent, the additive comprises vinylene carbonate, and the organic solvent comprises ethyl methyl carbonate; the mass ratio of the vinylene carbonate to the methyl ethyl carbonate to the azo initiator is 1: (50-85): (0.01-0.15); the mass content of fluoroethylene carbonate in the semi-solid electrolyte precursor solution is less than 10 ppm, and the mass content of boron is less than 10 ppm. According to the invention, the fluoroethylene carbonate and boron element content, and the precise appropriate proportion and synergistic effect of the vinylene carbonate, the methyl ethyl carbonate, the azo initiator and other components are beneficial to obtaining the semi-solid battery with excellent high temperature resistance and excellent cycle performance at normal temperature and high temperature; the cycle life of the semi-solid battery is obviously prolonged, and the cycle stability is good.