572 results about "Potassium ions" patented technology

A fire retarding biochemical liquid composition including: a dispersing agent realized in the form of a major amount of water, for dispersing alkali metal ions dissolved in the water; a major amount of a first fire retarding agent realized in the form of a first alkali metal salt of a nonpolymeric saturated carboxylic acid, specifically, tripotassium citrate, for providing metal potassium ions dispersed in the water when the at least one alkali metal salt is dissolved in the water to form a mixed retardant solution; a minor amount of a second fire retarding agent realized in the form of a second alkali metal salt of a nonpolymeric saturated carboxylic acid, specifically, sodium benzoate (SB), for providing metal sodium ions dispersed in the water when the at least one alkali metal salt is dissolved in the mixed retardant solution, for functioning as a secondary fire retardant agent and also inhibiting surface corrosion reactions involving metals contacting the mixed retardant solution, including specific metals, namely 2024-T3 Aluminum, 4130 Steel, Yellow Brass, and Az31B Magnesium; a minor amount of thickening agent in the form of a biomolecular polymer consisting of polysaccharides, for increasing the viscosity of the mixed retardant liquid during application operations; a minor amount of coloring agent in the form of fugitive color dye powder, or non-fugitive pigment powder, for imparting a visible color (e.g. red or green) when the fire retarding biochemical liquid composition is applied to a surface to be protected against fire, as water molecules in the retardant liquid coating evaporate to the environment during drying, to form a thin fire retardant coating deposited on the treated surfaces having a characteristic visible color, and comprising potassium and sodium salt crystals mixed within the polysaccharides of the biomolecular polymer. Wet and dry concentration formulations of the fire retarding biochemical liquid composition are disclosed for use with both serial and ground delivery methods and apparatus.

A long-term fire retarding biochemical liquid composition including: a dispersing agent realized in the form of a major amount of water, for dispersing alkali metal ions dissolved in the water; a major amount of a first fire retarding agent realized in the form of a primary alkali metal salt of a nonpolymeric saturated carboxylic acid, for example, tripotassium citrate, for providing metal potassium ions dispersed in the water when the at least one alkali metal salt is dissolved in the water to form a mixed retardant solution; a minor amount of a second fire retarding agent realized in the form of a secondary alkali metal salt of a nonpolymeric saturated carboxylic acid, for example, potassium, sodium, calcium and / or magnesium benzoate, for providing benzoate ions dispersed in the water when the secondary alkali metal salt is dissolved in the mixed retardant solution, for functioning as a secondary fire retardant agent.

The invention relates to the technical field of blood potassium detection, in particular to a blood potassium detection paper-based sensor and a preparation method and application thereof.The sensor is obtained by integrating a substrate, a sensing electrode and a whole blood microfluid channel, and the sensing electrode is located between the substrate and the whole blood microfluid channel; the whole blood microfluid channel comprises a serum diffusion area, a whole blood separation area positioned above the serum diffusion area and a blood potassium detection area positioned below the serum diffusion area; a blood separation membrane is also arranged in the whole blood separation area; the substrate is qualitative filter paper, and the sensing electrode comprises an all-solid-state PBA working electrode and an Ag / AgCl reference electrode; compared with the prior art, calibration is not needed when potassium ions in whole blood are detected, the whole blood sample can be directly used, centrifugal separation is not needed, the detection speed is increased, the hemolysis problem of the whole blood sample in blood potassium detection can be avoided, and the detection sensitivity, accuracy and stability are further improved.

The invention discloses a potassium ion sensor based on AuNPs / MXene / SPCE and a preparation method thereof, and belongs to the technical field of electronic components. Comprising a screen-printed carbon electrode SPCE, an MXene layer modified on the surface of a working electrode of the screen-printed carbon electrode, a gold nanoparticle AuNPs layer formed on the surface of the MXene layer through an electrochemical deposition method, a potassium ion selective membrane covering the gold nanoparticle AuNPs layer, and a GO-PVA hydrogel layer coating the surface of the potassium ion selective membrane. According to the prepared sensor, only potassium ions in sweat can pass through the selective membrane, the selectivity of the sensor is improved, meanwhile, due to the application of the AuNPs / MXene composite material, the surface area-volume ratio of a silk-screen printing carbon electrode is greatly improved, more potassium ions participate in ion-electron conversion, the sensitivity of the sensor is improved, and the application range of the sensor is widened. And the detection range is expanded.

The invention provides a preparation method of a lanthanum oxide modified biochar fertilizer, and belongs to the technical field of agricultural fertilizers, and the preparation method comprises the following steps: 1, microwave activation of biochar: placing corn straw biochar in a microwave reactor for radiation to obtain porous activated biochar; 2, potassium ion loading: dipping the porous activated charcoal in a saturated KOH solution to obtain a solid precipitate, and drying the solid precipitate to obtain potassium-loaded charcoal; 3, lanthanum-organic complex preparation: mixing lanthanum oxide with citric acid, adding deionized water to form a suspension, and performing evaporative crystallization to obtain a lanthanum-citric acid complex; 4, compounding modified biochar: mixing the obtained lanthanum-citric acid complex with potassium-loaded biochar to prepare slow-release lanthanum oxide modified biochar; and 5, compounding a phosphate fertilizer to obtain the slow-release composite charcoal fertilizer. According to the method, the charcoal is modified through lanthanum oxide, so that the modified charcoal has a larger specific surface area, the problem of hardening of the saline-alkali soil is better solved, and the oxygen content of the soil is increased.

The invention discloses a phase transfer catalyst of metal ion complexing crown ether for efficiently preparing aquacide dichloride and application of the phase transfer catalyst. The catalyst is prepared by taking crown ethers as 18-crown-6 and dicyclohexyl-18-crown-6 ether and complex ions as lewis acid active components such as potassium ions, lithium ions, cobalt ions, copper ions and the like through a direct chemical method. The catalyst synergistically catalyzes a nucleophilic substitution reaction of a pyridine derivative and alkyl halide in an aprotic polar solvent such as acetonitrile or nitrobenzene, and synthesis of diquat dichloride can be realized under the conditions of 60-140 DEG C, normal pressure and no oxygen. The mass ratio of the pyridine derivative to the catalyst to the solvent in a reaction system is 1: (0.001-0.05): (5-8), and real-time monitoring and regulation are performed through an online infrared spectrum, a liquid chromatograph and a gas chromatograph-mass spectrometer. The purity of the product is more than 99% after the product is subjected to filtration, recrystallization with an ethanol-water mixed solvent and vacuum drying. The catalyst provided by the invention has the characteristics of high activity, strong stability and recoverability, obviously improves the atom economy of the reaction, simplifies the production process, reduces the energy consumption and pollution, and is suitable for large-scale industrial production.

The invention relates to an activated carbon continuous treatment device for multi-stage synergistic potassium removal and a control method thereof, and belongs to the technical field of activated carbon continuous treatment.The activated carbon continuous treatment device is characterized in that a washing unit, an acid pickling unit, an ion exchange unit and a high-temperature calcination unit are sequentially connected, and multi-stage synergistic potassium removal is achieved through washing, acid pickling, ion exchange and high-temperature calcination; continuous potassium removal of activated carbon is achieved, efficiency loss caused by multi-step separation operation is avoided, an online detection module and a central control system are integrated to dynamically adjust washing flow, acid liquor concentration, ion exchange resin regeneration cycle and calcination temperature gradient, resource waste and waste liquid discharge are reduced, and the potassium removal efficiency is improved by combining ion exchange and high-temperature calcination. The limitation of a single process on removal of chemically bonded potassium ions is broken through, thorough potassium removal is ensured, seamless connection of all treatment units is achieved through the material conveying assembly, and the problems that in a traditional process, equipment is dispersed, and large-scale continuous production is difficult to achieve are solved.

The invention relates to the technical field of fire prevention, and discloses a high-and-low-voltage power distribution room fire prevention early warning system based on potassium ion aerosol fire extinguishing, which comprises a smoke fire detection module used for detecting fire related data inside and outside a high-and-low-voltage power distribution room; the fire related data comprises smoke data and temperature data; the comprehensive evaluation module is used for judging whether an adopted evaluation model is a temperature evaluation model or a smoke evaluation model according to the fire related data; the fireproof grade classification module is used for grading fireproof grades in the high and low voltage power distribution room according to the screened evaluation model; the fire prevention measure implementation module is used for starting the potassium ion aerial fog fire extinguishing equipment in the corresponding fire prevention subareas to extinguish fire according to different grades; the electrical characteristic monitoring module is used for monitoring the load current and arc signal intensity of electrical equipment in the high-low voltage power distribution room and the temperature change rate of key nodes in real time; according to the invention, multi-dimensional accurate monitoring and graded prevention and control of the fire risk of the high and low voltage power distribution room are realized.

The invention relates to the technical field of organic synthetic chemistry, in particular to a preparation method of ethyl 2-n-butyl acetoacetate, which comprises the following specific steps: S1, preparation of a composite solid base catalyst, S2, synthesis of ethyl 2-n-butyl acetoacetate, S3, post-treatment of a reaction solution, and S4, separation and purification of a product. The preparation method has the following beneficial effects that the magnesium-aluminum composite oxide is used as a carrier, and the composite solid base catalyst loaded with potassium and lanthanum has relatively high catalytic activity and selectivity; the magnesium-aluminum composite oxide carrier has a relatively large specific surface area and rich alkaline sites, so that a good catalytic environment is provided for the reaction; as a main active component, potassium ions can effectively activate alpha-active methylene of ethyl acetoacetate and promote formation of negative ion intermediates; the introduction of lanthanum ions can adjust the electronic structure of the catalyst, enhance the stability of the active center and inhibit the occurrence of side reactions.

The invention relates to an adsorbent based on an X molecular sieve and preparation and application thereof, and a preparation method of the adsorbent comprises the following steps: (1) mixing the X molecular sieve with a binder, molding and roasting to obtain a molded body; (2) treating the molded body obtained in the step (1) with an alkali solution to perform in-situ crystallization on the binder in the molded body to obtain a crystallized product; (3) carrying out partial barium ion exchange on the crystallized product obtained in the step (2) by using a barium salt solution, and drying to obtain a dried product; (4) carrying out ammonium ion exchange on the dried product obtained in the step (3) by using an ammonium salt solution, and roasting in a flowing atmosphere to obtain a roasted product; and (5) performing barium ion exchange and optional potassium ion exchange on the roasted product obtained in the step (4), and then drying to obtain the adsorbent. The adsorbent has at least two kinds of mesoporous channels with different apertures, has high barium ion exchange capacity, high adsorption capacity and compressive strength, and shows good adsorption selectivity and mass transfer performance when used for adsorption separation of p-xylene.

The invention relates to a salt form of a pyrrole sulfonamide acid inhibitor as well as a preparation method and application of the salt form. Specifically, the invention discloses a compound shown as a formula (I), n = 0.1-2.0, and HA is an organic acid or an inorganic acid. The compound has the characteristics of convenience in storage, long-term stability of the product and simple preparation method, meets the industrial production requirements, and meets the development requirements of clinical pharmaceutical preparations. The compound disclosed by the invention can be used for preparing a potassium ion competitive acid blocker and preparing a medicine for treating gastric acid related diseases. # imgabs0 #

The invention relates to a potassium ion battery cathode material preparation method, which comprises: S1, mixing a vanadium source, a phosphorus source and citric acid, drying, and calcining for the first time to obtain a mixture precursor; and S2, mixing the mixture precursor obtained in the step S1 with a potassium source, and calcining for the second time to obtain the cathode material. The potassium ion battery cathode material beta-KVOPO4 prepared by the invention has excellent structural stability and relatively high working voltage, shows good cycle stability, can be matched with various anode materials to prepare a potassium ion secondary battery with high energy density, and has far-reaching significance in application of the potassium ion battery cathode material.

The present invention provides a stable amorphous tigorasone of formula (I). The present invention provides stable amorphous tigorazan that is free of other solid state forms, is stable over shelf life, and does not convert to any other solid state form.

The invention discloses a tellurium-doped sulfurized polyacrylonitrile potassium storage negative electrode material and a potassium ion total battery, and belongs to the field of potassium ion batteries. In order to solve the technical problems of low sulfur utilization rate and poor rate capability when sulfurized polyacrylonitrile is used as a potassium storage negative electrode material, the tellurium-doped sulfurized polyacrylonitrile (Te-SPAN) material with high performance is synthesized in a tellurium doping manner. In the tellurium-doped sulfurized polyacrylonitrile (Te-SPAN), the content of tellurium is lower than 5%, the content of sulfur is 33%-39%, and the content of carbon is 59%-62%. When the Te-SPAN is used as a potassium storage negative electrode material, the Te-SPAN shows high potassium storage capacity, excellent rate capability and cycling stability. In addition, the potassium ion total battery assembled based on the composite negative electrode and the low-defect manganese potassium hexacyanoferrate positive electrode also shows very excellent electrochemical performance.

The invention belongs to the field of lithium battery recycling, and particularly relates to a method for recycling lithium in lithium iron phosphate battery black powder. The method comprises the following steps: sieving the lithium iron phosphate battery black powder with a 200-mesh sieve, oxidizing the powder with oxygen for 20-40 minutes to obtain powder a; dry ball milling: weighing phosphoric acid salt of sodium, the powder a and potassium superphosphate, mixing, and carrying out dry milling for 2-3 hours to obtain powder b; iron removal: dissolving the powder b subjected to dry grinding in water, and filtering to obtain a solid phase a and filtrate a; adding 0.1-0.3 wt.% of alkali into the filtrate a, and filtering to obtain filtrate b; leaching out lithium; adding an aqueous solution of saturated soluble carbonate into the filtrate b obtained in the step S3, heating and concentrating, and filtering while hot; washing and enriching; and washing with hot water, filtering, and collecting a solid phase to complete lithium recovery. According to the method, lithium ions are replaced through potassium ions and sodium ions, mechanical ball milling and the oxidation effect of persulfate are matched, lithium is leached in a synergistic mode, corrosion to equipment is small, and meanwhile the leaching rate of lithium can reach 98% or above.

The invention discloses a low-disordered expanded pi conjugated organic material, a preparation method thereof and a potassium ion battery. The preparation method comprises the following steps: by taking commercial tetraaminobenzoquinone as a synthetic monomer, adding a hydrochloric acid solution for ultrasonic dispersion, then adding sodium acetate to obtain a turbid solution II, then placing the turbid solution II in flowing oxygen, heating and stirring, then washing and drying, putting the obtained powder into dimethyl sulfoxide to obtain a turbid solution III, then ventilating and drying at high temperature, then washing with ethanol, and filtering to obtain a target product. And drying in vacuum to obtain the low-disordered expanded pi conjugated organic material. The organic material can expose more active sites and has a more open skeleton structure, potassium ion diffusion paths are reduced, the capacity and rate capability of TAPT can be greatly improved, the problem that the capacity, cycling stability and ionic conductivity are difficult to improve at the same time when the organic electrode material is applied to a potassium ion battery is solved, and the application prospect is wide. The preparation method is high in cost benefit, simple, convenient and environment-friendly in preparation process, wide in application range and excellent in electrochemical performance.

The invention belongs to the technical field of health-care food, and particularly relates to functional milk assisting in lowering blood pressure and a preparation method thereof.The functional milk comprises, by weight, 99.5% of raw milk and 0.5% of a potassium ion bridged citrus fiber-green tea polyphenol network, raw milk is sequentially subjected to trypsin and proline specific incision enzyme treatment, HPCD-ultrasonic treatment and pulsed magnetic field treatment. The invention provides a systematic solution, which exceeds a simple extraction and addition mode in the prior art, and solves the stability problem of the antihypertensive active component in the processing and storage process.

The invention provides a preparation method and application of a potassium adsorption material and a selective extraction method of potassium in mixed alkali metal salt. The method comprises the following steps: firstly, preparing adsorbent slurry, immersing a porous metal material into the slurry, and carrying out ultrasonic treatment, maintenance, drying and activation to obtain a potassium adsorption material which can selectively extract potassium ions in mixed alkali metal salt; the selective extraction method of potassium in mixed alkali metal salt comprises the following steps: adding a potassium adsorption material into alkali metal salt in a molten state to selectively fix potassium ions to the potassium adsorption material, then adding a first extraction agent, converting insoluble potassium fixed by the potassium adsorption material into soluble potassium ions, and filtering to obtain a first filtrate; adding a second extracting agent into the first filtrate, filtering to obtain a second filtrate, and performing evaporative crystallization on the second filtrate to obtain a potassium salt product; the problems that an existing industrial mixed salt separation process is tedious, high in cost, low in resource recovery efficiency, free of selectivity and pertinence and the like are solved.

The invention discloses a preparation method and application of doped hierarchical porous manganese dioxide, and belongs to the field of catalyst preparation and air purification. According to the invention, potassium permanganate is used as a manganese source and an oxidizing agent, a modified reducing agent is added, mixing and stirring reaction are carried out at room temperature, and the doped hierarchical porous manganese dioxide catalyst is synthesized after washing, drying and high-temperature treatment. The preparation method is simple in preparation process and high in repeatability; the prepared manganese dioxide realizes doping of potassium ions and formation of oxygen vacancies, and the catalytic activity of the manganese dioxide is improved; the doped manganese dioxide catalyst has a multi-stage structure of micropores, mesopores and macropores, the multi-stage pore structure endows the doped manganese dioxide catalyst with a relatively large specific surface area, the physical adsorption capacity of the doped manganese dioxide catalyst can be improved, and meanwhile, more active sites are exposed, so that the doped manganese dioxide catalyst shows relatively high activity and stability in a reaction for catalytically oxidizing gaseous pollutant formaldehyde at room temperature.

The invention discloses a functionalized hybrid flame retardant based on cyclodextrin-MOF (Metal Organic Framework) as well as a preparation method and application thereof, and belongs to the technical field of high polymer material science and flame retardance. The hybrid flame retardant (F-CD-MOF) has a core-shell structure, a core body is crystalline CD-MOF formed by self-assembly of cyclodextrin and potassium ions, and a shell layer is an organic interface layer which is formed by grafting of a silane coupling agent and contains an active functional group (-NH2 or-NCO). The preparation method comprises the steps of CD-MOF primary crystal synthesis, surface silanization functionalization and post-treatment. The flame retardant can be used as a reactive nanofiller for preparing a high-performance flame-retardant polyurea coating, a polyurea three-dimensional cross-linked network is embedded through covalent bonding, the UL-94 flame-retardant grade of the obtained coating reaches V-0 grade, the peak heat release rate is reduced by 40% or above compared with that of a pure polyurea coating, and the flame retardant has excellent mechanical properties and is suitable for industrial production. The fireproof coating is suitable for high-end fireproof fields such as building fireproof coatings and electric power facility fireproof coating materials.

The invention discloses a composite inducer for promoting adhesion and metamorphosis of marine bivalve mollusk larvae and an application method of the composite inducer. The composite inducer for promoting adhesion and metamorphosis of the marine bivalve mollusk larvae comprises glutamine, glutamic acid, potassium chloride, calcium chloride and taurine, and the concentration ratio of the glutamine to the glutamic acid to the potassium chloride to the calcium chloride to the taurine is 1: 1: 2 * 10: 1.7 * 10: 4. According to the application, glutamine, potassium ions, calcium ions, glutamic acid and taurine are matched, the application effect of the glutamine, the potassium ions, the calcium ions, the glutamic acid and the taurine in the aspect of improving the attachment and metamorphosis rate of the shellfish larvae is defined, the technical blank of multi-component cooperative regulation and control of the attachment and metamorphosis of the shellfish at present is filled, a new solution is provided for bivalve shellfish fry production, and the application prospect is wide. The method is of great significance in promoting healthy development of the mariculture industry.

The invention relates to modified nitrogen-rich carbon nitride as well as a preparation method and photocatalytic application thereof. The preparation method comprises the following steps: mixing nitrogen-rich carbon nitride and fused salt, and performing secondary calcination to obtain an intermediate; the secondary calcining temperature is 550 DEG C to 600 DEG C; the fused salt comprises a potassium source; and washing and drying the intermediate to obtain the modified nitrogen-rich carbon nitride. According to the invention, potassium ion doping modification is carried out in nitrogen-rich carbon nitride, so that the nitrogen-rich carbon nitride has stronger photon-generated carrier separation and transmission capability because the internal transmission resistance is reduced due to high crystallinity of KC3N5 and K < + > is successfully introduced to serve as a transmission channel for interlayer electron transfer, after introduction of K < + >, Eb of C3N5 is significantly reduced, exciton dissociation and generation of photon-generated carriers are facilitated, and the performance of the material is improved. The effect of producing H2O2 through photocatalysis of the KC3N5 is enhanced; when the photocatalyst is applied to photocatalytic production of H2O2, the production rate of H2O2 can reach up to 117 times of that of C3N5, and the photocatalyst has excellent photocatalytic stability, can efficiently produce H2O2 in a wide pH range, and is suitable for various complex water substrates to remarkably improve the production rate of H2O2.

The invention relates to a preparation method of a cathode catalyst with a multilevel structure for electro-catalysis of carbon dioxide reduction, and belongs to the field of new energy nano materials and the technical field of electro-catalysis. The invention aims to solve the problems of low selectivity in acidic electrolyte, salt deposition caused by introduction of excessive potassium ions and the like. According to the main scheme, an electrostatic spinning method is adopted for preparing a Zn < 2 + > / PAN nanofiber membrane, then the Zn < 2 + > / PAN nanofiber membrane is soaked in a solution containing nickel salt and 2-methylimidazole for in-situ growth of ZIF-8, meanwhile, adsorption of nickel can be promoted, and finally, high-temperature pyrolysis is conducted to obtain the nitrogen-doped carbon nanotube coated nickel nanoparticles (Ni-coated NCNT / HPNF) with the surfaces modified by hollow porous carbon nanofibers of a multilevel structure. Wherein the hollow porous carbon nanofiber is used as a'trunk ', the nitrogen-doped carbon nanotube is used as a'branch', and the nickel nanoparticles are embedded as a'fruit '. The hierarchical structure can enrich K < + > in the solution in the acidic electrolyte, so that side reaction hydrogen evolution can be inhibited, and the problem of salt deposition is also relieved.

The invention belongs to the technical field of synthetic pharmaceutical chemistry, and particularly relates to a pyrrole sulfonyl potassium ion competitive acid blocker compound as well as a preparation method and application thereof. According to the present invention, the compound reversibly inhibits H < + > and K < + >-ATPase so as to provide functions of gastric acid secretion inhibition and acid-related disease treatment; experimental results show that the compound disclosed by the invention can well inhibit H < + > and K < + >-ATP enzymes to play a role in inhibiting gastric acid secretion, and can be further used for developing a potassium ion competitive acid blocker (P-CAB).

The invention relates to the technical field of detection, and provides a sweat electrolyte detection method based on a CRI SPR technology, and the method comprises the following steps: firstly, collecting a sweat sample through a flexible patch, and carrying out impurity removal and pH value adjustment on sweat; then, respectively carrying out enrichment treatment on sodium ions and potassium ions in the sweat by utilizing the magnetic nanoparticles of which the surfaces are modified with specific recognition ligands; then, introducing the enriched sample into a designed CRI SPR detection system, and generating a fluorescence signal through a specific reaction of the CRI SPR system; then, monitoring the generated fluorescence signal in real time, removing noise interference in the signal by using a denoising algorithm, and correcting a signal time sequence error by using a time axis correction algorithm; and finally, converting the processed fluorescence signals into concentration values of sodium ions and potassium ions in sweat by utilizing the trained random forest model.

The application relates to the technical field of saline-alkali soil improvement, and particularly discloses a preparation process of a multifunctional slow-release type saline-alkali soil improver and application thereof. The preparation process comprises the following steps: (1) uniformly mixing seaweed acid powder, phosphogypsum powder, carbon powder and water to form wet materials, then placing the wet materials in a sealed container for heating and heat preservation treatment, and obtaining a precursor after the treatment; and (2) placing the precursor at normal temperature for standing, crushing the precursor after the standing, and obtaining the soil improver. The soil improver prepared by the above process can not only more efficiently and quickly fix sodium ions, potassium ions, calcium ions and magnesium ions in the soil, but also can reduce the content of carbonate ions, so that the soil salt content and the soil alkalinity are reduced. In addition, the soil improver can help to relieve the phenomenon of soil alkali and salt return, and reduce the usage amount of the improver in the subsequent soil improvement process.

The invention discloses a modified hard carbon material, a preparation method thereof and a battery, and relates to the technical field of battery negative electrode materials. The preparation method comprises the following steps: forming a hard carbon layer by taking grafted silicon dioxide as a template, coating the hard carbon layer with a soft carbon layer, coating the soft carbon layer with silicon dioxide, performing confinement carbonization, and removing the template. Wherein the grafted silicon dioxide contains hetero atoms S, and the hard carbon layer contains hetero atoms P. During preparation, a silicon dioxide template grafted with 3-mercaptopropyltriethoxysilane is prepared by a reverse micelle method, a phenolic resin precursor is coated to form the hard carbon layer, P is introduced through modification of triglycidyl phosphate, then an asphalt-based soft carbon layer is coated, and carbonization is performed to obtain the modified phenolic resin. And removing silicon dioxide to obtain the target material. According to the material, active sites and interlayer spacing are increased through precise doping of S and P, volume expansion is relieved through cooperation of soft carbon and hard carbon, ion adsorption is enhanced through oxygen groups, and the material shows high capacity and excellent cycle stability in secondary batteries such as potassium ions and the like and is suitable for the field of novel energy storage batteries.

The present invention relates to the technical field of battery materials, and in particular to a nitrogen-sulfur co-doped hard carbon negative electrode material for sodium / potassium ion batteries and a preparation method thereof. The preparation method comprises preparing a mixture powder of dodecyl sulfonate and a nitrogen source, carbonizing under inert gas conditions, washing the carbonized product, and vacuum drying to obtain a nitrogen-sulfur co-doped hard carbon negative electrode material. The introduction of nitrogen atoms in the negative electrode material prepared by the present invention can change the surface charge distribution of the carbon material, improve the electronic conductivity, and at the same time increase the active sites, and promote the capacitive adsorption behavior of the carbon material for sodium / potassium ions; the introduction of sulfur atoms can increase the hard carbon interlayer spacing, reduce the sodium / potassium ion diffusion energy barrier, enhance the diffusion kinetics behavior, and synergistically improve the sodium / potassium storage performance of the hard carbon material. The above-mentioned negative electrode material can be used to prepare sodium / potassium ion batteries with high specific capacity, excellent rate performance and long cycle stability, and the preparation method is simple in process, controllable in large quantities, low in cost, and environmentally friendly.

This invention relates to a method for preparing carbon materials based on in-situ surface fluoride modification, comprising the following steps: ① dissolving carbon material powder, aluminum nitrate, and polyvinyl alcohol in anhydrous ethanol to obtain an aluminum nitrate solution; ② dissolving ammonium fluoride in a mixed solvent to obtain an ammonium fluoride solution; slowly adding the ammonium fluoride solution dropwise to the aluminum nitrate solution to carry out an in-situ AlF3 growth reaction to obtain a composite material precursor; ③ drying the composite material precursor and then calcining it using a programmed temperature rise method to solidify the coating layer, thereby obtaining the AlF3@C composite material. This invention also discloses the application of this carbon material. The preparation method of this invention is simple and low-cost, and can efficiently prepare AlF3@C composite materials. The obtained AlF3@C composite material, as a negative electrode material for potassium-ion or lithium-ion secondary batteries, can significantly improve a series of properties such as the initial coulombic efficiency, rate performance, cycle stability, and potassium ion diffusion kinetics of the battery.

The invention relates to the field of molecular sieves and discloses a modified LSX molecular sieve as well as a preparation method and application thereof. The method comprises the following steps: (1) carrying out potassium ion exchange on a K-containing LSX molecular sieve by using a potassium salt solution; (2) optionally, carrying out ammonium ion exchange on the solid obtained in the step (1) by using ammonium salt; (3) optionally, mixing the solid obtained in the step (2) with a lithium salt solution for lithium ion exchange; wherein in terms of K2O, the content of K in the K-containing LSX molecular sieve is not less than 8.5 wt%. According to the method disclosed by the invention, the higher lithium salt utilization rate can be obtained while the high lithium ion exchange degree is ensured.