32results about "Sodium/potassium compounds" patented technology

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.

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 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.

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.

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

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 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.

According to one aspect of the present disclosure, a method of producing purified silicon comprises providing an alkali or alkaline earth metal and a metallic or aminated halide salt of silicon; combining the alkali or alkaline earth metal and metallic or aminated halide salt of silicon in a liquid medium to form a precipitate; combining the precipitate with sulfuric acid or another acid to form a byproduct and silicon; and recovering the purified silicon. In some embodiments, the liquid medium is an amine or ammonia. In some embodiments, the alkali or alkaline earth metal and metallic or aminated halide salt of silicon are combined at a low temperature such that the amine or ammonia are in a liquid phase.

This application discloses a capacity compensation additive and a method for preparing the same, a positive electrode sheet, a battery, and a power consumption device, wherein the capacity compensation additive comprises a capacity compensating agent and a catalyst-containing carbon material, and the catalyst-containing carbon material is coated on at least a portion of the surface of the capacity compensating agent.

To provide a method of producing a positive electrode active material with good cycle characteristics.SOLUTION: A method of producing a positive electrode active material includes: bringing first particles that contain a lithium transition metal composite oxide into contact with a solution containing sodium ions to obtain second particles containing the lithium transition metal composite oxide and sodium elements, the lithium transition metal composite oxide having a layered structure and having 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 or more 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 or more to 450°C or less.SELECTED DRAWING: Figure 1

Disclosed in the present disclosure are a method for preparing sodium hexafluorophosphate, and a sodium-ion battery electrolyte. The method for preparing sodium hexafluorophosphate comprises: adding sodium fluoride into an organic solvent, and introducing phosphorus pentafluoride to cause the phosphorus pentafluoride to react with the sodium fluoride; filtering the reaction product to obtain a filtrate; evaporating and concentrating the filtrate at a first temperature so that a mass content of the sodium hexafluorophosphate in the filtrate is 20% to 60%; crystallizing and filtering the evaporated and concentrated filtrate at a second temperature to obtain a filter cake and a sodium hexafluorophosphate concentrate product, wherein the second temperature is lower than the first temperature; and drying the filter cake to obtain a sodium hexafluorophosphate solid product.

This invention discloses a continuous refining apparatus for sodium hexafluorophosphate, including a precooler. The precooler is sequentially connected to at least one refining unit, a buffer unit, and a solid-liquid separation unit. The liquid outlet of each refining unit is connected to the feed inlet via a heat exchanger, and the liquid outlet of the solid-liquid separation unit is connected to the feed inlet of the final refining unit. The invention also relates to a continuous refining apparatus and method for sodium hexafluorophosphate. The sodium hexafluorophosphate raw material liquid obtained from reaction synthesis is cooled by the precooler and then injected into the first-stage refining unit. The temperature inside the refining unit is controlled, and the slurry is continuously discharged from the outlet of the first-stage refining unit and sequentially injected into the buffer unit and the solid-liquid separation unit. Simultaneously, the mother liquor from each refining unit is cooled by the heat exchanger and then enters the feed inlet. The solid discharged from the solid-liquid separation unit is collected to obtain sodium hexafluorophosphate crystals, and the mother liquor discharged from the solid-liquid separation unit is returned to the final refining unit. This method can improve the quality of sodium hexafluorophosphate products.

Provided herein are compositions and methods of manufacturing compositions useful in producing battery electrolyte precursors and battery electrolytes.

The application belongs to the technical field of sodium hexafluorophosphate and particularly relates to a one-pot preparation process of sodium hexafluorophosphate. The one-pot preparation process of sodium hexafluorophosphate comprises the following steps: (1) reaction: anhydrous hydrogen fluoride is put into a reactor, a sodium source and a phosphorus source are sequentially added at a temperature of -60 to -20 DEG C, then the temperature is increased to 0 to 10 DEG C for reaction, volatile substances are evaporated after the reaction is completed, and a sodium hexafluorophosphate primary product is obtained; (2) neutralization: an organic solvent is added to the sodium hexafluorophosphate primary product for dissolution, then an alkaline substance is added to adjust the pH value of the solution system to 7 to 9, filtration is performed, a sodium hexafluorophosphate solution is obtained, the organic solvent is evaporated by increasing the temperature, and a sodium hexafluorophosphate crude product is obtained after drying. The one-pot preparation process has the advantages of mild conditions, simple operation, fast reaction rate, easy separation of the product, high purity and high yield of the prepared sodium hexafluorophosphate crude product, and is suitable for industrial production.

The application provides a preparation method of anhydrous hexafluorophosphoric acid and a high-purity liquid salt thereof, and belongs to the technical field of secondary batteries. The anhydrous hexafluorophosphoric acid is obtained by the following steps: reacting a phosphorus-containing compound with anhydrous hydrogen fluoride to generate an aqueous solution of hexafluorophosphoric acid, removing water by using an organic solvent, crystallizing, and sweating to purify; and the high-purity liquid hexafluorophosphate salt is obtained by the following steps: reacting the high-purity anhydrous hexafluorophosphoric acid with an alkali metal source uniformly dispersed in an organic solvent, and removing impurities. The preparation method of the anhydrous hexafluorophosphoric acid is simple and efficient, the product has a low water content, is not easy to hydrolyze to generate byproducts, and has a purity of no less than 99.9%, the high-purity liquid hexafluorophosphate salt is prepared by using the anhydrous hexafluorophosphoric acid, the preparation step of the hexafluorophosphate salt crystal is omitted, the high-purity hexafluorophosphate salt liquid is directly obtained, and the method is more economical.

Aspects of the present disclosure are directed to methods, compositions, and kits for detection and analysis of DNA and RNA modifications, such as DNA and RNA nucleobase methylation. Certain aspects include methods, compositions and kits useful in sequencing of methylated nucleic acids, including methylated nucleic acids from low-input samples such as cell-free DNA and cell-free RNA. Certain aspects include novel N-nitrosation strategies for deamination of DNA and RNA biological macromolecules under mild conditions. In some aspects, provided are compositions, methods, and kits comprising means for cooperative catalysis of a carbonyl organocatalyst with a Lewis acid to facilitate the formation of a C-nitro intermediate from a primary amine, which, upon rearrangement into N-nitrosamine, leads to selective deamination of unsubstituted canonical DNA and RNA bases under mild conditions.

Provided in the present disclosure are hydrogen fluoride and a preparation method therefor, and a battery material. The preparation method for hydrogen fluoride comprises: reacting fluosilicic acid with first sulfuric acid, so as to generate mixed gas and first mixed sulfuric acid, wherein the first mixed sulfuric acid is a sulfuric acid solution comprising hydrogen fluoride, and the mixed gas comprises silicon tetrafluoride gas and hydrogen fluoride gas; washing the mixed gas with second sulfuric acid, so as to obtain second mixed sulfuric acid and washed silicon tetrafluoride gas, wherein the second mixed sulfuric acid is obtained by absorbing the hydrogen fluoride gas by the second sulfuric acid; washing water-containing hydrogen fluoride with the second mixed sulfuric acid, so as to obtain crude hydrogen fluoride gas; and purifying the crude hydrogen fluoride gas, so as to obtain anhydrous hydrogen fluoride.

The utility model provides a two-stage reaction device for efficiently synthesizing sodium hexafluorophosphate, and belongs to the technical field of sodium hexafluorophosphate processing. The utility model discloses a two-stage reaction device for efficiently synthesizing sodium hexafluorophosphate. The kettle cover is fixedly connected to the upper end of the reaction kettle in a clamping manner; the thermal insulation plate is fixedly connected to the circumferential inner wall of the reaction kettle through bolts; according to the device, when a person adds hexafluorophosphoric acid and sodium carbonate into the reaction kettle, the person can pour hexafluorophosphoric acid and sodium carbonate into the metering box and confirm the usage amount of hexafluorophosphoric acid and sodium carbonate, and after confirmation is completed, the L-shaped sliding plate is pulled to slide in the sliding groove, so that hexafluorophosphoric acid and sodium carbonate flow down; the device is simple in structure and convenient for personnel to master the accurate usage amount of the hexafluorophosphoric acid and the sodium carbonate, improves the stability of a sodium hexafluorophosphate finished product synthesized by the hexafluorophosphoric acid and the sodium carbonate, also improves the working efficiency of the personnel, and saves manpower consumption.

The invention belongs to the field of chemical production, and provides a method for activating low-grade potassium phosphate rock, which comprises the following steps: carrying out mechanical ball-milling pretreatment on potassium phosphate rock and quick lime according to different proportions, and carrying out hydrothermal reaction to realize efficient activation and conversion of potassium. The method of consuming strategic calcium fluoride resources and using strong acid in the traditional process is replaced, and the problems of introduction of harmful impurities such as fluorine and chlorine and equipment corrosion are avoided; the method provided by the invention solves the key problems of high energy consumption, quartz waste residue discharge, serious impurity interference, non-renewable resource waste and the like in the existing potassium extraction technology, realizes collaborative utilization of associated elements such as silicon, calcium and the like in the ore, does not produce solid wastes in the whole process, and is suitable for resourceful treatment of low-grade potassium phosphate ore.

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

Embodiments relate to the field of hexagonal boron nitride (hBN). In particular, to an alkali metal (A) intercalated hBN material. The A-intercalated hBN is chemically active, electrically conducting, and superconducting. The A-intercalated hBN is spontaneously soluble in aprotic organic solvents to form dispersions of exfoliated reduced 2-dimensional hBN sheets in organic solvents. The dispersions of exfoliated reduced 2-dimensional hBN materials in organic solvents materials can be reacted with metal salts to form 2-dimensional hBN-supported metal and / or metal oxide nanoparticle composites. The solutions / dispersions of exfoliated reduced 2-dimensional hBN materials in organic solvents can be transferred to water or organic solvents to form stable aqueous and organic suspensions of 2-dimensional hBN.

The present invention provides a bicarbonate production method suitable for producing a high purity bicarbonate while suppressing loss of carbon dioxide. The bicarbonate production method includes a generation step of generating a bicarbonate by using a mixed gas that contains carbon dioxide, and a concentration of the carbon dioxide in the mixed gas is 30 volume% or more and 95 volume% or less in a standard state.

A PROCESS FOR THE PREPARATION OF METAL HEXAFLUOROPHOSPHATE The present invention relates to a mechanical process for the preparation of metal- hexafluorophosphate, wherein the process is devoid of solvent use and purification step and involves less metal use. The present invention also relates to the use of metal-hexafluorophosphate as an electrolyte salt in different batteries.

This invention discloses a method for synthesizing tri(p-tolyl)thionium hexafluorophosphate, comprising the following steps: di(4-chlorophenyl) sulfoxide is mixed uniformly with a solvent, and p-tolyl magnesium bromide is slowly added under an inert atmosphere. After stirring for 10 min, trimethylchlorosilane is added dropwise. After the reaction is complete, a 25 wt.% hydrobromic acid aqueous solution is added dropwise to quench the reaction. After extraction and vacuum concentration, tri(p-tolyl)thionium bromide is obtained. A potassium hexafluorophosphate aqueous solution is added to the tri(p-tolyl)thionium bromide and stirred. After the reaction is complete, the mixture is filtered, and the filter cake is recrystallized to obtain tri(p-tolyl)thionium hexafluorophosphate. This invention uses inexpensive and readily available raw materials, employs mild activation conditions, has high production safety, and achieves a yield of up to 71.34% for the obtained tri(p-tolyl)thionium hexafluorophosphate.