29 results about "Electrolytes sodium" patented technology

An electrolyte, a sodium secondary battery and an electric device. The electrolyte comprises a first sodium salt and a first solvent, wherein the first sodium salt comprises sodium trifluoromethanesulfonate, and the first solvent has a structure as shown in formula I, with the mass ratio of the first sodium salt to the first solvent being 0.01-0.4. The electrolyte has a good low-temperature ionic conductivity, which is beneficial for improving the low-temperature cycling performance and low-temperature coulombic efficiency of the battery.

The invention discloses a sodium-ion battery electrolyte and a preparation method thereof, and relates to the technical field of sodium-ion batteries, the electrolyte comprises a sodium salt, a composite solvent, an additive and an auxiliary agent, the sodium salt is formed by compounding sodium bis (fluorosulfonyl) imide, sodium bis (trifluoromethanesulfonyl) imide and modified sodium bis (oxalato) borate, and the composite solvent is formed by compounding sulfolane, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol and 1, 3-butanediol. The auxiliary agent is nano-scale ZIF-8, the additive is 1, 3-propylene glycol dimethyl ether, dimethyl carbonate, fluoroethylene carbonate and ethyl acetate, the additive is modified 1, 3-propane sultone, trimethyl phosphate and hydroquinone dimethyl ether, and the auxiliary agent is nano-scale ZIF-8. According to the electrolyte, sodium bis (oxalato) borate is modified after being treated by hydrogen peroxide and has efficient hydrofluoric acid resistance, meanwhile, hydrofluoric acid generated by the reaction of fluorine-containing sodium salt and water in the electrolyte can be specifically removed by utilizing an auxiliary agent of the nano ZIF-8 and a synergistic effect formed by the sodium salt and the auxiliary agent, and damage of the hydrofluoric acid to a negative electrode SEI film is avoided; and the cycle life of the sodium ion battery is prolonged.

This invention relates to a sodium-supplementing material capable of simultaneously replenishing active sodium and sodium hexafluorophosphate, and its preparation and application. The sodium-supplementing material comprises the following raw material components by weight percentage: 10-50% elemental phosphorus, 50-90% sodium fluoride, and 1-5% Ketjen Black. Compared with existing technologies, the phosphorus-based bifunctional sodium-supplementing separator and sodium-supplementing cathode provided by this invention not only possess higher theoretical capacity, effectively compensating for irreversible capacity loss during the first cycle of the battery, but also generate NaPF6 in situ under electrochemical conditions through the synergistic reaction of red phosphorus and sodium fluoride, achieving simultaneous replenishment of active sodium and electrolyte sodium salts, thereby improving the initial coulombic efficiency and long-term cycle performance of the battery.

The invention provides a composite solid electrolyte and a preparation method and application thereof. The composite solid electrolyte is composed of a nitrile polymer solid electrolyte, a sodium salt, a plasticizer, an inorganic electrolyte and an interface coupling agent, wherein the interface coupling agent accounts for 0.5-2% of the total mass of the composite solid electrolyte. The preparation method comprises the following steps: sequentially dissolving and dispersing the components in an inert atmosphere, and finally preparing the high-performance interface modified composite solid electrolyte by combining ultrasonic treatment and vacuum drying technologies. The modified composite solid electrolyte effectively enhances the interfacial compatibility between the organic polymer component and the inorganic component, and overcomes the problem of poor interface bonding between the organic polymer component and the inorganic component. The preparation process is simple and easy to control, and the ionic conductivity of the prepared composite solid electrolyte is remarkably improved. The composite solid electrolyte is applied to an all-solid-state sodium battery, the cycling stability and the rate capability of the battery are greatly improved, and the composite solid electrolyte shows good application prospects and market potential.

The application discloses a kind of sodium ion battery electrolyte and preparation method thereof, it is related to sodium ion battery technical field, the electrolyte includes: sodium salt, composite solvent, additive and auxiliary agent, the sodium salt is sodium difluorosulfurylimide, sodium bis-trifluoromethanesulfonimide and modified sodium borate dihydroxide dioxalate compound composition, composite solvent is sulfolane-1,3-propanediol dimethyl ether, dimethyl carbonate, fluoroethylene carbonate and ethyl acetate, additive is modified 1,3-propane sulfone lactone, trimethyl phosphate and hydroquinone dimethyl ether, auxiliary agent is nano ZIF-8.This electrolyte sodium borate dihydroxide dioxalate is modified after hydrogen peroxide treatment, with high-efficiency anti-hydrofluoric acid capacity, while using the auxiliary agent of nano ZIF-8, sodium salt and auxiliary agent form synergistic effect can be targeted to remove hydrogen fluoride sodium salt and moisture reaction generated in electrolyte hydrofluoric acid, avoid the damage of hydrofluoric acid to negative electrode SEI film, and then improve the cycle life of sodium ion battery.

The invention discloses an electrolyte for regulating and controlling a stability mechanism of a sodium metal battery as well as a preparation method and application of the electrolyte. The electrolyte comprises an organic solvent, electrolyte sodium salt and an additive, wherein the additives are fluoro carbonates and sulfones. According to the invention, additives are added into the electrolyte, and the two additives are subjected to division and cooperation at the positive electrode side and the negative electrode side: a fluoro-carbonic ester reinforced solid electrolyte interface (SEI) and a sulfone stable positive electrode electrolyte interface (CEI), and complementation and cooperation are realized through solvation regulation and interface adsorption; by using the electrolyte added with the additive, the overall interface stability of the sodium metal battery can be remarkably improved, good electrochemical performance is ensured, the battery can efficiently and stably circulate, and excellent rate capability is shown. The electrolyte is prepared by adopting a low-cost and simple method, and the extremely stable sodium metal battery is obtained.

This application provides a sodium secondary battery electrolyte, a sodium secondary battery, and an electric apparatus. The sodium secondary battery electrolyte is provided, and the electrolyte includes a diluent, where the diluent includes alkane with a general formula CnH2n+2, where n is 8 to 13. The diluent can improve high-temperature cycling performance of a battery, reduce high-temperature gas production of the battery, and enhance electrochemical performance and safety performance of the battery at high temperature.

The application discloses a sodium supplement modification method for a negative-electrode-free sodium battery and the negative-electrode-free sodium battery. A composite positive electrode sodium supplement agent is added in a positive electrode active material; the composite positive electrode sodium supplement agent is composed of a sodium-rich layered oxide of a sodium ion battery and sodium carbonate; the mass of the composite positive electrode sodium supplement agent is 0.5wt%-10wt% of the total mass of the positive electrode active material; meanwhile, an electrolyte sodium supplement agent is added in an electrolyte; the added amount of the electrolyte sodium supplement agent is 1wt%-4wt% of the total mass of the electrolyte; and the mass ratio of the added amount of the electrolyte sodium supplement agent to the added amount of the composite positive electrode sodium supplement agent is in the range of 0.2-2:1. Through the cooperation of the electrolyte sodium supplement and the positive electrode sodium supplement, the application realizes rapid sodium supplement, continuous sodium supplement and interface optimization, effectively compensates for the irreversible sodium loss in the first charge-discharge process of the negative-electrode-free sodium battery, significantly improves the first coulomb efficiency, the energy density and the cycle stability of the battery, and promotes the large-scale application of the negative-electrode-free sodium battery.

The invention discloses trioxymethylene-containing sodium ion battery two-component electrolyte as well as a preparation method and application thereof. The two-component electrolyte consists of a component A and a component B, the component A comprises electrolyte sodium salt, an electrolyte solvent and trioxymethylene; the component B comprises Lewis acid or a Lewis acid precursor. The two-component electrolyte is divided into a component A containing trioxymethylene and a component B containing an initiator. The two components are stable after being independently placed and can be stored for a long time. And when the battery needs to be used, the component A and the component B are mixed and added into the battery for use. A new thought is provided for storage and transportation of the trioxymethylene-containing sodium ion battery electrolyte, and industrial production of the trioxymethylene-containing semi-solid sodium ion battery is facilitated.

The invention provides a green and efficient preparation method of an anthelmintic albendazole sulfoxide, which is characterized in that water is used as a green oxygen source, an anodic oxidation reaction is driven by electric energy at room temperature, albendazole sulfoxide is synthesized with high selectivity, and sulfone by-products generated by excessive oxidation are effectively avoided. According to the method, albendazole, cheap electrolyte sodium bromide, dimethyl sulfoxide and water are mixed into homogeneous reaction liquid, inert gas protection is not needed, and the homogeneous reaction liquid is introduced into an electrochemical microchannel continuous reactor to achieve oxidation. Compared with a traditional hydrogen peroxide oxidation method and a low-temperature chemical oxidation method, the method does not need to use a stoichiometric oxidizing agent, is mild in reaction condition, effectively avoids related safety and environmental risks, meets the requirements of green and sustainable development, and has a good industrial application prospect.

An embodiment of this application provides an electrolyte for a sodium-ion battery, a sodium-ion battery cell, a secondary battery, and an electric apparatus, belonging to the field of battery technology. The electrolyte includes a first additive, and the first additive includes a compound represented by general formula (I), where R1, R2, R3, and R4 each independently include at least one of a single bond or an alkylene group having 1 to 4 carbon atoms, R5 includes (II) or (III), R6 includes at least one of (IV), (V), and (VI), and R7 includes at least one of a single bond, an alkylene group having 1 to 3 carbon atoms, and an alkoxyalkylene group having 1 to 3 carbon atoms. A technical solution of the embodiment of this application can improve performance of the sodium-ion battery.

The present invention discloses a modified current collector and a preparation method thereof, a positive electrode sheet and a negative electrode-free sodium ion battery, and relates to the technical field of sodium ion batteries. The present invention in situ grows aluminum oxide and a solid electrolyte sodium aluminum titanium phosphate on a three-dimensional aluminum metal substrate, which can provide a faster ion conduction rate, reduce the injection amount of the electrolyte, reduce the growth of dendrites, and increase the safety performance of the battery. The solid electrolyte (sodium aluminum titanium phosphate) and the artificial SEI film (sodium carbonate / sodium fluoride) are formed on the surface of the three-dimensional current collector, which is conducive to the deposition of sodium metal inside the three-dimensional substrate, and can prevent sodium dendrites from growing on the surface of the current collector to prevent puncturing the diaphragm. The solid electrolyte, artificial SEI film and negative electrode-free metal battery are used together, so the effect of reducing costs, extending cycle life, and improving battery capacity density and safety is achieved.

The invention provides a sodium-ion battery electrolyte, a preparation method and a sodium-ion battery, and belongs to the technical field of sodium-ion batteries. The sodium-ion battery electrolyte comprises an electrolyte sodium salt, an organic solvent and a functional additive, the electrolyte sodium salt comprises sodium difluorophosphate and sodium bis (fluorosulfonyl) imide; the organic solvent comprises cyclic carbonate, a sulfonate solvent and fluoroether. According to the invention, sodium difluorophosphate and sodium bis (fluorosulfonyl) imide are adopted as electrolyte sodium salts, so that a stable sodium ion conduction channel can be provided in the charging and discharging process of the battery, the battery is ensured to have good ionic conductivity, the charging and discharging efficiency of the battery is improved, and the performance of the electrolyte is remarkably improved by adding the functional additive.

The present invention provides an in-situ grown solid electrolyte current collector, a preparation method and application thereof, and a negative electrode-free sodium ion battery, and relates to the field of battery technology. The preparation method of the in-situ grown solid electrolyte current collector provided by the present invention is to complete the in-situ growth of solid electrolyte sodium aluminum titanium phosphate by coating a binder-free conductive agent sol on the surface of the current collector and introducing TiO2 seeds. The preparation method is simple and convenient. The solid electrolyte sodium aluminum titanium phosphate is in-situ grown on the prepared current collector, which can provide a faster ion conduction rate, reduce the injection amount of electrolyte, reduce the growth of dendrites, and increase the safety performance of the battery; the current collector also contains an ultra-thin conductive agent coating and does not contain a binder, which is conducive to the uniform deposition of sodium ions. The in-situ grown solid electrolyte current collector is used in the preparation of negative electrode-free sodium ion batteries, which can effectively reduce costs, extend cycle life, and improve battery energy density and safety.

The invention discloses a sodium zirconium phosphate composite material for hemodialysis and a preparation method thereof, and belongs to the technical field of hemodialysis, the preparation method comprises the following steps: (1) modifying zirconium phosphate by using a sodium hydroxide solution to obtain modified zirconium phosphate; and (2) preparing a mixed suspension by using the modified zirconium phosphate, a nonionic surfactant, a polymer and an organic solvent, atomizing the mixed suspension into micro-droplets by using an electrostatic spraying method, and collecting the micro-droplets by using a nonionic surfactant aqueous solution to obtain the sodium zirconium phosphate composite material for hemodialysis, the method disclosed by the invention is simple in steps and easy to implement, and the prepared sodium zirconium phosphate composite material for hemodialysis is spherical or sphere-like in morphology, large in particle size and good in NH4 < + > removal effect, can be simply regenerated by using a proper electrolyte sodium chloride solution after being used, and can be recycled for multiple times.

The present application provides an electrolyte solution and a battery. The electrolyte solution comprises: an electrolyte sodium salt; and an organic solvent, the organic solvent being an isophthalate solvent and / or a terephthalate solvent, wherein the volume content of the organic solvent accounts for 50 vol% or above of the solvent in the electrolyte solution.

The application discloses a negative-electrode-free sodium battery electrolyte and a preparation method and application thereof, and belongs to the battery field.The negative-electrode-free sodium battery electrolyte comprises the following raw materials in parts by weight: 50-80 parts of a linear ether main solvent; 10-30 parts of 1,3-dioxolane cosolvent; 10-17 parts of an electrolyte sodium salt; and 0.3-2 parts of a pyridine boronic acid additive.The pyridine boronic acid additive is at least one of pyridine-3-boronic acid, pyridine-3-boronic acid neopentyl glycol ester and pyridine-4-boronic acid neopentyl glycol ester.The linear ether main solvent is at least one of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, ethylene glycol diethyl ether and diethylene glycol diethyl ether.The negative-electrode-free sodium battery electrolyte can achieve the effects of good first-effect exertion and long cycle life.

The present application belongs to the field of organic electrochemical oxidation technology, and relates to a method for preparing oxidized phosphine compounds by clean and efficient electrochemical oxidation. Organic phosphine compounds I are mixed with electrolyte, water and solvent to obtain a mixed solution; the mixed solution is subjected to electrochemical reaction by passing electricity to prepare oxidized phosphine compounds II. The present application realizes green and efficient preparation of phosphine oxide compounds with various structures and electrical properties under room temperature conditions by using cheap and readily available electrolyte sodium chloride and water as an oxygen source. Compared with the current widely used oxidation method, the present application has the advantages of not needing to add oxidizing agents and catalysts, not needing to be carried out under inert gas protection, safe and clean reaction process, high efficiency, simple post-treatment and separation process and the like. The present application uses green electrons as an oxidizing agent, avoiding the widely used complex oxidation systems at present, such as hydrogen peroxide system, metal oxide catalytic oxidation system and organic catalyst oxidation system.

The invention discloses an electrolyte material performance evaluation method and system combining multi-scale molecular dynamics and an electrochemical model, a medium and a processor. The problem that the comprehensive performance of an electrolyte material from the molecular scale to the system level cannot be accurately evaluated in the prior art is solved. The method comprises the following steps: firstly, constructing a sodium ion battery electrochemical model containing a sodium ion diffusion equation, an electrolyte sodium ion concentration equation and a current density equation, and solving; updating a battery end voltage and a temperature field according to the solution field; whether the temperature change rate exceeds a threshold value or not is judged, if not, parameters such as ion diffusivity are obtained through molecular dynamics simulation to determine the electrolyte performance, and if yes, the performance is determined by fitting a correlation equation of ion conductivity and the like with salt concentration and temperature through an analytical expression. According to the invention, a'molecular dynamics-electrochemical thermal coupling 'full-chain analysis framework is constructed, the comprehensive performance of the electrolyte is accurately evaluated, the technical fault of the traditional method is filled, and the engineering of the high-safety and low-heat-consumption sodium ion battery is assisted.

The application discloses a low-self-discharge sodium ion battery electrolyte, which comprises an ether organic solvent, an electrolyte sodium salt and an additive, wherein the additive is a carbonate additive, a sulfate additive or a salt additive; the carbonate additive is one or more than two of fluoroethylene carbonate, ethylene carbonate and / or vinylene carbonate; the sulfate additive is one or more than two of 1,3-propane sulfonic acid lactone, 1,3-butane sulfonic acid lactone and / or propylene sulfate; and the salt additive is sodium bis(fluorosulfonyl)imide and / or sodium bis(trifluoromethylsulfonyl)imide. The sodium ion battery assembled by the low-self-discharge electrolyte has the characteristics of high stability, good solvation effect and excellent electrochemical performance.

The application discloses an electrolyte for sodium ion batteries and a preparation method thereof, and a sodium ion battery, and belongs to the technical field of electrochemical energy storage materials. The electrolyte comprises an electrolyte sodium salt, an organic solvent and a functional additive. The molecular structure of the functional additive is that a nitrogen-containing heterocyclic cation group is covalently bonded to a cross-linkable silane group through a sulfur-containing linking group. The additive can migrate to the electrode interface during battery cycling, and the cation part participates in the construction of a stable chemical passivation layer, while the silane part can be in-situ hydrolyzed and condensed to form an enhanced organic silicon network, thereby synergistically constructing a solid electrolyte interface film with excellent chemical stability and high mechanical strength. The application further discloses a preparation method of the functional additive and the electrolyte. The scheme can significantly improve the cycle stability and capacity retention rate of the sodium ion battery under high-rate charging and discharging conditions, and the process is simple and easy to implement.

The invention discloses a wide temperature range sodium ion battery electrolyte and a sodium ion battery, the electrolyte comprises a solvent, a film forming agent and an electrolyte sodium salt, the solvent is a composite solvent, and the composite solvent comprises the following solvents in parts by volume: 30-50 vol parts of cyclic carbonate, 10-25 vol parts of carboxylic ester, 5-10 vol parts of a fluorinated solvent, 10-25 vol parts of an ether solvent and 0.01-5 vol parts of a functional sulfonation solvent. The wide-temperature-range sodium-ion battery electrolyte and the sodium-ion battery have the characteristics of excellent low-temperature performance, good film-forming stability, high cycling stability and wide temperature application range.

The invention relates to a sodium ion solid-state electrolyte, a sodium ion solid-state battery and a preparation method thereof, and belongs to the technical field of batteries. A sodium ion solid electrolyte comprises a sodium salt, an electrolyte substrate and a tin salt additive. And the wettability and stability between the sodium metal negative electrode and the sodium ion solid electrolyte interface can be effectively improved, so that the cycle performance of the solid sodium ion battery is improved.

The embodiment of the invention provides an electrolyte and a battery. The electrolyte comprises an electrolyte sodium salt; the organic solvent is an isophthalic acid ester solvent and / or a terephthalic acid ester solvent; wherein the volume content of the organic solvent accounts for more than 50vol% of the electrolyte solvent.

The application discloses a preparation method of high-purity sodium bisfluorosulfonimide, and belongs to the technical field of sodium battery electrolyte sodium salt. The method comprises the following steps: preparing bischlorosulfonimide by heating and stirring bisulfamic acid, dichlorosulfoxide and chlorosulfonic acid in a refluxing manner; distilling and purifying the bischlorosulfonimide after fluorination of the bischlorosulfonimide by a fluorination agent to obtain a bisfluorosulfonimide crude product; and drying and recrystallizing the crude product after reaction with a sodium salt to obtain the sodium bisfluorosulfonimide. The preparation method can improve the fluorination conversion rate and yield of the bischlorosulfonimide by adding a cocatalyst containing trimethylammonium chloride, crown ether and phosphonic acid groups, and finally, the high-purity sodium bisfluorosulfonimide is prepared.

This application provides an electrolyte, a sodium-ion battery, a battery module, a battery pack, and an electric apparatus. The electrolyte includes a sodium salt and an organic solvent. The organic solvent includes a fluorinated organic substance, an ether organic substance, and a coordinating organic substance, where the coordinating organic substance includes a plurality of functional groups capable of coordinating with transition metal. The electrolyte provided in this application can improve cycling performance of sodium-ion batteries in high-temperature environments.

An embodiment of this application provides an electrolyte for a sodium-ion battery, a sodium-ion battery cell, a secondary battery, and an electric apparatus, belonging to the field of battery technology. The electrolyte includes a first additive, and the first additive includes a compound represented by general formula (I), where R1, R2, R3, and R4 each independently include at least one of a single bond or an alkylene group having 1 to 4 carbon atoms, R5 includes (II) or (III), R6 includes at least one of (IV), (V), and (VI), and R7 includes at least one of a single bond, an alkylene group having 1 to 3 carbon atoms, and an alkoxyalkylene group having 1 to 3 carbon atoms. A technical solution of the embodiment of this application can improve performance of the sodium-ion battery.

This invention discloses a high-rate sodium-ion battery electrode and its preparation method, relating to the field of electrochemical energy storage technology. The electrode comprises a porous current collector, a sodium-rich gel electrolyte (sodium salt concentration ≥3M) filling its pores, and a gradient particle size active material layer (bottom layer of small particles + top layer of large particles). During charging and discharging, the gel electrolyte provides sodium to the active material near the current collector. + This invention alleviates concentration polarization; the gradient structure reduces ion transport tortuosity. The electrode fabricated in this invention has low internal resistance and excellent rate performance, making it suitable for high-power sodium-ion batteries.

An electrolyte for a sodium metal battery is disclosed. The electrolyte includes a non-aqueous solvent and a sodium salt. The non-aqueous solvent comprises an ether solvent that includes ethylene glycol dimethyl ether and one or more compounds represented by a general formula: R1—(O—R3)n—O—R2, where R1 and R2 are independently selected from C1-C6 alkyl groups, R3 is selected from a C1-C5 alkylene group, and n is an integer from 2 to 5; or R1 and R2 are selected from C2-C6 alkyl groups, R3 is a C1-C5 alkylene group, and n is 1. The mass percentage of ethylene glycol dimethyl ether ranges from 5% to 50%. The electrolyte improves the cycle performance of the sodium metal battery, particularly under low-temperature conditions.