68results about "Sodium/potassium compounds" patented technology

The present invention provides a battery-grade sodium fluorosulfonate and a preparation method thereof, the preparation method comprising: first mixing chlorosulfonic acid and anhydrous hydrogen fluoride, and obtaining fluorosulfonic acid after a first reaction; second mixing sodium chloride and the obtained fluorosulfonic acid, and obtaining battery-grade sodium fluorosulfonate after a second reaction. In the present invention, fluorosulfonic acid is prepared by reacting chlorosulfonic acid with anhydrous hydrogen fluoride, and then fluorosulfonic acid is reacted with sodium chloride to obtain battery-grade sodium fluorosulfonate. The preparation method does not use organic solvents when synthesizing battery-grade sodium fluorosulfonate, will not cause harm to the human body and is environmentally friendly, the tail gas can be sold as a by-product, and the reagents used in the preparation process can be reused; in addition, the preparation method has a high yield when preparing battery-grade sodium fluorosulfonate, and the obtained battery-grade sodium fluorosulfonate has a high purity.

The invention discloses hydrogen fluoride, a preparation method thereof and a battery material. The preparation method of hydrogen fluoride comprises the steps that fluosilicic acid and first sulfuric acid react to generate mixed gas and first mixed sulfuric acid, the first mixed sulfuric acid is a sulfuric acid solution containing hydrogen fluoride, and the mixed gas comprises silicon tetrafluoride gas and hydrogen fluoride gas; washing the mixed gas with second sulfuric acid to obtain second mixed sulfuric acid and washed silicon tetrafluoride gas; the second mixed sulfuric acid is obtained by absorbing the hydrogen fluoride gas by second sulfuric acid; washing the water-containing hydrogen fluoride with second mixed sulfuric acid to obtain crude hydrogen fluoride gas; and purifying the crude hydrogen fluoride gas to obtain anhydrous hydrogen fluoride. According to the preparation method of the hydrogen fluoride, through washing treatment of the second sulfuric acid and washing treatment of the second mixed sulfuric acid, the recovery rate of the hydrogen fluoride is remarkably increased.

The invention provides lithium fluoride as well as a preparation method and application thereof. The mass content of carbonate in the lithium fluoride is less than or equal to 1000mg / kg; d10 of the lithium fluoride is smaller than or equal to 10 microns, D50 of the lithium fluoride is smaller than or equal to 20 microns, and the bulk density of the lithium fluoride is 0.9-1.2 g / cm < 3 >. The lithium fluoride provided by the invention has a specific size specification and relatively low carbonate impurity content, and the lithium fluoride is beneficial to preparation of electrolyte salt capable of improving the electrical performance of a battery.

The invention discloses a continuous cyclic preparation method of hexafluorophosphate. The method comprises the following steps: S1, preparation of a metal salt anhydrous hydrogen fluoride solution: adding anhydrous hydrogen fluoride and metal halide salt into a reaction kettle, and uniformly mixing, so that the metal halide salt is dissolved in the anhydrous hydrogen fluoride to obtain the metal salt anhydrous hydrogen fluoride solution; s2, preparing a hexafluorophosphate anhydrous hydrogen fluoride solution: adding phosphorus pentachloride into the reaction kettle under a temperature control condition for reaction; a hexafluorophosphate anhydrous hydrogen fluoride solution is obtained; and S3, separation of hexafluorophosphate: transferring the hexafluorophosphate anhydrous hydrogen fluoride solution into a drying tower for drying, condensing gasified anhydrous hydrogen fluoride at the top of the drying tower into liquid anhydrous hydrogen fluoride by a condenser, refluxing the liquid anhydrous hydrogen fluoride into the reaction kettle in the step S1, and collecting a hexafluorophosphate product at the bottom of the drying tower. The continuous cyclic preparation method of hexafluorophosphate has the characteristics of high raw material utilization rate, simple process and good production continuity.

The invention discloses a preparation method of sodium fluorosulfate, which comprises the following steps: mixing sodium pyrosulfate and ammonium fluoride in an aprotic polar solvent, and reacting at 50-200 DEG C to generate sodium fluorosulfate; after the reaction is finished, separating to obtain a solution containing sodium fluorosulfate; concentrating the solution, and adding an anti-solvent to induce sodium fluorosulfate crystallization; and separating to obtain sodium fluorosulfate. According to the invention, safe and easily available ammonium fluoride and sodium pyrosulfate are adopted as raw materials, one-step reaction is carried out in a mild aprotic polar solvent system, and an anti-solvent crystallization process is combined, so that efficient preparation of sodium fluorosulfate with high purity, low acid value and no chloride ion residue is successfully realized; and the problems of dependence on high-risk raw materials and serious pollution of byproducts in the prior art are solved.

The present invention relates to a process for producing salts from brine obtained from the desalination of seawater. The process can also make it possible to selectively recover NaCl, CaSO4, kainite, carnallite, magnesium sulfate, struvite, newberyite, or potassium bitartrate.

A sodium supplement material, a preparation method thereof, positive electrode plate, and sodium-ion battery. The sodium supplement material includes a sodium supplement agent body and first particles exposed on the surface of the sodium supplement agent body. In any 300 nm×200 nm region on the surface of the sodium supplement material, the number of first particles ranges from 2 to 20. The first particles include one or more conductive agent particles and one or more catalyst particles.

A method of producing a positive electrode active material, the method includes: contacting first particles that contain a lithium transition metal composite oxide with a solution containing sodium ions to obtain second particles containing the lithium transition metal composite oxide and sodium element, wherein the lithium transition metal composite oxide has a layered structure and a composition ratio of a number of moles of nickel to a total number of moles of metals other than lithium in a range of from 0.7 to less than 1; mixing the second particles and a boron compound to obtain a mixture; and heat-treating the mixture at a temperature in a range of from 100° C. to 450° C.

A sodium supplementing material, a preparation method therefor, a positive electrode plate, and a sodium-ion battery. The sodium supplementing material comprises a sodium supplementing agent body, and first particles exposed on the surface of the sodium supplementing agent body. In any 300 nm x 200 nm region of the surface of the sodium supplementing material, there are 2-20 first particles, and the first particles comprise conductive agent particles and catalyst particles.

A method for generating / synthesising a metal hexafluorophosphate is disclosed which comprises dissolving ammonium hexafluorophosphate in tetrahydrofuran (THF) solvent, and flowing the resulting dissol

This invention belongs to the field of fly ash treatment technology, specifically disclosing a method for separating potassium and sodium from fly ash, including the following steps: adjusting the acid concentration in the fly ash washing solution to 40-65% and the temperature to 40-65℃, adding a sodium precipitating agent and maintaining the reaction temperature, and filtering to obtain sodium salt and potassium-containing waste liquid. This invention utilizes precipitation to recover sodium ions from fly ash washing solution. After filtration, sodium salt precipitate and potassium-containing waste liquid are obtained. During this process, the reaction is controlled under acidic conditions to prevent potassium ion precipitation. At 40-60℃, the sodium precipitating agent reacts with sodium ions to obtain sodium salt precipitate with large crystals, which allows for more convenient and thorough filtration, resulting in better separation of potassium and sodium ions in the fly ash washing solution. The sodium salt precipitate is further washed with a displacement agent to replace the potassium ions attached to the surface of the sodium salt precipitate with sodium, improving the purity of the sodium salt product. Finally, multiple water washings are performed to reduce the acidity of the sodium salt precipitate, resulting in a sodium salt product with stable quality.

This application discloses hexafluorophosphate, phosphorus pentafluoride, and its preparation method and use. This application does not use phosphorus pentafluoride as raw material to prepare hexafluorophosphate, and does not use hydrogen fluoride as raw material to produce phosphorus pentafluoride, reducing the safety risk of production, and uses chemical reagents such as diphosphorus pentaoxide and sulfur trioxide, which have a wide supply source, as raw materials, reducing raw material costs and favoring industrial large-scale production. [Means] The method for preparing the hexafluorophosphate comprises mixing a phosphoric acid solution of diphosphorus pentoxide with sulfur trioxide and a fluoride in an inert gas atmosphere, and after the reaction, sequentially carrying out evaporation concentration, dissolution, filtration and drying to obtain the hexafluorophosphate. The method for preparing the phosphorus pentafluoride using the hexafluorophosphate obtained by the preparation method of the present application comprises mixing the hexafluorophosphate with a catalyst solution, and after the catalytic reaction, sequentially carrying out condensation, pressurization liquefaction and removal of impurities by adsorption to obtain the phosphorus pentafluoride.

The present disclosure provides a sodium supplement material, its preparation method, positive eletrode plate, and sodium-ion battery. The sodium supplement material includes a sodium supplement agent body and first particles exposed on the surface of the sodium supplement agent body. In any 300 nm × 200 nm region on the surface of the sodium supplement material, the number of first particles ranges from 2 to 20. The first particles include one or more conductive agent particles and one or more catalyst particles.

The invention relates to a process for recovering an electrolyte and co-producing potassium hexafluorophosphate, which comprises the following steps: 1) taking the electrolyte, adding potassium fluoride and potassium carbonate solid, stirring for 0.5-1.5 hours at room temperature, and then stirring for 4-6 hours at 40-50 DEG C; 2) after stirring is finished, carrying out solid-liquid separation, and recovering the solvent from the obtained filtrate in a rectification manner; 3) performing solid-liquid separation to obtain a solid, adding acetonitrile, and stirring at 20-25 DEG C for 30-60 minutes; 4) after stirring, filtering and washing to obtain a lithium fluoride solid; and carrying out rotary evaporation on the obtained filtrate at 60-70 DEG C to obtain a crude potassium hexafluorophosphate solid. According to the process, a step-by-step extraction and hydrolysis process route is adopted, operation is easy, industrial production is easy to achieve, energy consumption and cost are reduced, and the potassium hexafluorophosphate solid is produced while the electrolyte is recycled; and guidance is provided for electrolyte recovery and potassium hexafluorophosphate synthesis in the future.

This invention relates to the field of sodium hexafluorophosphate production, and particularly to a sodium hexafluorophosphate production apparatus, comprising a base plate and tanks. Several support columns are arranged at the upper end of the base plate, and three tanks are arranged at equal intervals above the support columns. Adjacent tanks are connected by several arc-shaped support plates. A stirring unit for preliminary mixing of chemical agents is installed in the lower tank. This invention uses a storage unit to store and preliminarily stir hydrogen fluoride and tetrapolyphosphoric acid raw materials. The mixed raw materials are then pumped to the lower tank via a water pump, where the stirring unit further stirs the raw materials. The preliminarily mixed raw materials are then transferred to the middle tank via a transfer assembly and the stirring unit. A water temperature unit regulates the temperature inside the corresponding tank, ensuring thorough mixing of the raw materials.

Provided herein are compositions and methods of making compositions useful in the production of battery electrolyte precursors and battery electrolytes.

This disclosure relates to a process for preparing ultra-high-purity alkali metal hexafluorophosphate (MPF6), comprising the steps of: (a) filling a first reactor "B" with alkali metal fluoride (MF) and flowing nitrogen gas through the first reactor "B"; (b) cooling the first reactor "B" to a predetermined temperature, then filling it with anhydrous hydrogen fluoride (AHF) gas and stirring the mixture containing alkali metal fluoride (MF) dissolved in AHF within the first reactor "B"; (c) cooling the mixture containing alkali metal fluoride (MF) dissolved in AHF within the first reactor "B" to a predetermined temperature; and (d) filling a second reactor "A" with phosphorus pentachloride (PCl5) and adding AHF in lots to achieve high purity The present invention relates to a process comprising: (e) generating phosphorus pentafluoride (PF5) and hydrogen chloride (HCl) gas; (f) reacting alkali metal fluoride (MF) dissolved in AHF in a first reactor "B" with the mixture of phosphorus pentafluoride (PF5) and hydrogen chloride (HCl) gas obtained in step (d) to obtain an alkali metal hexafluorophosphate mother liquor dissolved in AHF under a PF5 gas atmosphere; and (f) cooling the first reactor "B" to a predetermined temperature, maintaining the temperature of the alkali metal hexafluorophosphate mother liquor dissolved in AHF for a predetermined time, followed by filtration and drying at a predetermined temperature to obtain an alkali metal hexafluorophosphate (MPF6) selected from NaPF6, KPF6, or CsPF6.

To provide a method for producing a positive electrode active material excellent in cycle characteristics.SOLUTION: A method for producing a positive electrode active material includes obtaining second particles containing a lithium transition metal composite oxide having a layered structure and a composition in which a ratio of a number of moles of nickel to a total number of moles of metals other than lithium is 0.7 or more and less than 1 by bringing the first particles containing the lithium transition metal composite oxide into contact with a solution containing sodium ions, obtaining a mixture by mixing the second particles with a boron compound, and heat-treating the mixture at a temperature of 100 °C or higher and 450 °C or lower.SELECTED DRAWING: Figure 1

An aqueous coating composition for a separator in a secondary battery is provided. The coating composition includes: a) at least one polymeric binder, b) at least one alkali metal silicate, c) optionally, at least one alkali metal siliconate, and d) inorganic particles. A coated separator is also provided.

The present invention relates to a method for producing salts from a brine originating from seawater desalination. The method may further be used to selectively recover NaCl, CaSO4, kainite, carnallite, magnesium sulphate, struvite, newberyite or potassium bitartrate.

The present invention belongs to the field of sodium ion battery materials and discloses a precursor and a preparation method and application thereof. The preparation method of the precursor comprises: mixing Ni x Fe y Mn z (OH)2 and sodium hexafluorophosphate are mixed to obtain a mixed powder, the mixed powder is calcined at 180-250°C in an inert atmosphere, and cooled to obtain the precursor; wherein 0.2≤x≤0.5, 0.2≤y≤0.4, 0.1≤z≤0.6, x+y+z=1. The precursor is modified by sodium hexafluorophosphate, and then mixed with sodium and calcined to obtain a positive electrode material with excellent cycle stability.

The invention provides fluoride fluorescent particles, fluoride fluorescent powder and a preparation method thereof, a light-emitting element and a light-emitting device, and belongs to the technical field of fluorescent powder and light-emitting devices. The chemical formula of the fluoride fluorescent particle is Na2Si (1-X) F6: Mn4 + X, x is greater than 0 and less than 0.1, the fluoride fluorescent particle is of a polyhedral structure, and the polyhedral structure comprises an upper prismatic table, a lower prismatic table and prisms, the upper prismatic table and the lower prismatic table are symmetrically arranged, and the prisms are positioned between the upper prismatic table and the lower prismatic table and are respectively jointed with the lower bottom surface of the upper prismatic table and the lower bottom surface of the lower prismatic table. The fluorescent particle with the polyhedral structure has the characteristics of high emission intensity and high stability, and compared with a rod-shaped structure and an amorphous structure, the fluorescent particle with the polyhedral structure has the advantages that the contact area with water / water vapor after LED packaging is reduced, the dissociation speed is reduced, and the service life of an LED device is prolonged.

The present invention belongs to the field of environmental protection technology and specifically relates to a high-temperature, high-pressure steam extraction and dechlorination system for high-chloride waste. The system comprises a high-chloride waste pretreatment unit, a high-chloride waste transfer-extraction unit, and a low-chloride waste collection unit. The high-chloride waste transfer-extraction unit includes a first transfer assembly, a second transfer assembly, a steam extraction assembly, and an extrusion assembly. The first transfer assembly includes a first transfer filter cloth, the second transfer assembly includes a second transfer filter cloth, and the steam extraction assembly includes a high-temperature, high-pressure steam injection device. The system extracts chloride ions through high-temperature, high-pressure steam extraction, and then extrudes the chlorine-containing wastewater for centralized collection and discharge, thereby reducing the chlorine content in the high-chloride waste.

A method for preparing sodium hexafluorophosphate by a gas-solid process, and the use of same. The method comprises the following steps: introducing gaseous phosphorus pentafluoride into a sodium monofluorophosphate solid to perform a gas-solid reaction, so as to generate a solid mixture of sodium hexafluorophosphate and phosphate; then adding a polar solvent to the solid mixture for dissolving same, so as to obtain a sodium hexafluorophosphate solution and a solid filter residue; concentrating the sodium hexafluorophosphate solution, and then adding an organic solvent so as to precipitate sodium hexafluorophosphate to obtain a crude product; then adding a polar solvent for dissolving same to obtain a sodium hexafluorophosphate solution, concentrating same, adding an organic solvent for precipitating sodium hexafluorophosphate, and performing vacuum drying to obtain high-purity sodium hexafluorophosphate, the polar solvent being one of dimethyl carbonate and diethyl carbonate, and the organic solvent being one of benzene or toluene. The method uses the gas-solid process to synthesize sodium hexafluorophosphate, and involves simple technological processes, and the product after multi-stage purification has high purity, can be used as an electrolyte for sodium ion batteries for use in the fields of new energy electric vehicles, energy storage and the like, thus achieving wide application prospects.

The application relates to a preparation method of a hexafluorophosphate, and belongs to the field of battery electrolytes. The preparation method comprises the following steps: carrying out an electrolysis reaction on anhydrous HF, phosphorus powder and an alkali metal fluoride salt to generate the hexafluorophosphate. The weak fluorine is electrolyzed from the anhydrous HF, and then the weak fluorine, the phosphorus powder and the alkali metal fluoride salt are reacted to directly synthesize the hexafluorophosphate by one-pot method, so that the yield is higher and the operation is simple. Compared with the reaction of fluorine gas and elemental phosphorus, the reaction of the weak fluorine obtained by the electrolysis method and the phosphorus powder is more moderate, easy to control and high in safety.

This invention belongs to the field of solid electrolyte materials technology, and particularly relates to a Ca / Sr / Ba doped modified sodium-rich anti-perovskite solid electrolyte material and method. The material uses sodium-rich anti-perovskite Na3SI as a matrix, and is obtained by doping with at least one metal atom selected from Ca, Sr, and Ba to replace some of the Na atoms in the matrix. The crystal structure of the material belongs to the Pm-3m space group, with lattice parameters satisfying a=b=c=10.0-11.0 Å, α=β=γ=90°, formation energy ≤-1.14 eV, band gap of 3.27-3.40 eV, and room temperature ionic conductivity.

The present invention relates to a process for producing salts from brine obtained from seawater desalination. The process can also allow for the selective recovery of NaCl, CaSO4, kainite, carnallite, magnesium sulfate, struvite, newberyite, or potassium bitartrate.

The application provides a method for preparing sodium hexafluorophosphate for sodium batteries from sodium bifluoride, which comprises the following steps: taking electronic-grade sodium hydroxide and electronic-grade hydrofluoric acid as raw materials to generate an intermediate product sodium fluoride, and then reacting the intermediate product with phosphorus pentafluoride to obtain high-purity sodium hexafluorophosphate for sodium batteries. The particle size distribution and yield of sodium fluoride crystals are controlled by adjusting the stirring rate and cooling conditions, and then the purity and yield of sodium hexafluorophosphate are controlled, so that the purity of the finally obtained sodium hexafluorophosphate can reach more than 99.8%, the yield can reach more than 85%, the sodium hexafluorophosphate has the advantages of low cost and high yield, and is beneficial to industrialized production.

The present disclosure relates to a process for the preparation of ultra high purity alkali metal hexafluorophosphate (MPF6) comprising the steps of (a) charging alkali metal fluoride (MF) into a first reactor 'B' and flushing the first reactor 'B' with nitrogen, (b) cooling the first reactor 'B' to a predetermined temperature, the method comprises the following steps: (a) dissolving an alkali metal fluoride (MF) into a first reactor 'A', then charging anhydrous hydrogen fluoride (AHF) gas into a first reactor 'B' and stirring the mixture comprising the alkali metal fluoride (MF) dissolved in the AHF, (c) cooling the mixture comprising the alkali metal fluoride (MF) dissolved in the AHF in the first reactor 'B' to a predetermined temperature, (d) charging phosphorus pentachloride (PCl5) into a second reactor 'A' and adding the AHF in batches, the invention relates to a method for producing phosphorus pentafluoride (PF5) and hydrogen chloride (HCl) gas, (e) reacting alkali metal fluoride (MF) dissolved in AHF in a first reactor 'B' with a mixture of phosphorus pentafluoride (PF5) and hydrogen chloride (HCl) gas obtained in step (d) to obtain an alkali metal hexafluorophosphate mother liquor dissolved in AHF under the coverage of PF5 gas, (f) cooling the first reactor 'B' to a predetermined temperature, and (f) separating the alkali metal hexafluorophosphate mother liquor from the first reactor 'B' to obtain the phosphorus pentafluoride (PF5) and hydrogen chloride (HCl) gas. The present invention relates to a method for preparing an alkali metal hexafluorophosphate (MPF6), characterized in that the alkali metal hexafluorophosphate (MPF6), selected from NaPF6 or KPF6 or CsPF6, is dissolved in AHF, and the alkali metal hexafluorophosphate mother liquor dissolved in AHF is maintained at said temperature for a predetermined time, followed by filtration and drying at a predetermined temperature, to obtain the alkali metal hexafluorophosphate (MPF6) selected from the group consisting of NaPF6 or KPF6 or CsPF6.

The present invention relates to a process for preparing potassium bitartrate by treating a brine typically containing NaCl, KCl, CaSO4 and / or MgSO4 salts.