347 results about "Pyrophosphoric acid" patented technology

A positive electrode lead paste for a high-capacity and long-service-life storage battery and a preparation method therefor. The formula of the positive electrode lead paste comprises lead powder, dilute sulfuric acid, water and additives. In parts by mass, the additives added to every 1000 parts of the lead powder comprise: 1-3 parts of sodium perborate; 0.5-2 parts of 4BS; 1-3 parts of antimony trioxide; 1-3 parts of tin pyrophosphate; 2-4 parts of a polyolefin; 2-4 parts of a conductive carbon material; and 1-1.5 parts of a polyester staple fiber. By adding tin pyrophosphate and the polyolefin in the positive electrode lead paste, the capacity of a lead storage battery can be effectively increased and the service life thereof can be prolonged; and tin pyrophosphate and the polyolefin can work synergistically, and the addition of the two together achieves a better effect.

The invention relates to the technical field of sodium ion batteries, in particular to a modified ferric sodium pyrophosphate positive electrode material as well as a preparation method and application thereof. The modified ferric sodium pyrophosphate positive electrode material is Na < 4-x > A < x > Fe < 3-y > M < y > (PO4) < 2-z > E < z > (P2O7) w, wherein A is selected from any one or more of alkali metal ions or alkaline earth metal ions of which the ion radius is greater than Na < + >; m is selected from any one or more of transition metal ions; e is selected from any one or more of SiO4 < 4->, SO4 < 2->, BO3 < 3-> or F <->; 0.1 < = x < = 0.3, 0.1 < = y < = 0.3, 0.04 < = z < = 0.1, and the value of w enables positive and negative charges to be balanced. The stability of a crystal structure is optimized through multi-site multi-element doping, the ion / electron conduction efficiency is improved, and the oxidation reduction behavior is regulated and controlled, so that the cycle life, the rate capability and the energy density of the sodium ferric pyrophosphate positive electrode material are comprehensively improved.

The invention discloses a high-entropy ferric pyrophosphate sodium ion battery positive electrode material and a preparation method thereof, and belongs to the field of battery positive electrode materials. The chemical formula of the positive electrode material is Na4Fe3-aMa (PO4) 2P2O7 (0.05 < = a < = 0.5), M is a metal element and comprises at least five of cobalt, magnesium, zirconium, zinc, aluminum, molybdenum, copper, manganese, nickel, calcium and chromium, the high-entropy ferric sodium phosphate pyrophosphate battery positive electrode material is spherical, and the surface of the high-entropy ferric sodium phosphate pyrophosphate battery positive electrode material is coated with an amorphous carbon layer. The preparation method adopts a sol-gel method and comprises the following steps: mixing an iron source, a doped metal source, sodium pyrophosphate, ammonium dihydrogen phosphate and citric acid monohydrate according to a stoichiometric ratio, stirring, gelatinizing and drying to obtain xerogel, and calcining through a two-stage hydrogen-argon mixed gas to obtain the iron-doped metal-doped sodium pyrophosphate / citric acid composite material. The crystal structure is optimized by means of the high-entropy synergistic effect, the electron conductivity and the Na < + > diffusion rate are improved, and the industrial adaptability of the spherical morphology and the structural stability of carbon coating are combined.

The invention provides a ferric sodium pyrophosphate positive electrode material, a preparation method thereof and a sodium ion battery. The ferric sodium phosphate pyrophosphate positive electrode material comprises a ferric sodium phosphate pyrophosphate / carbon composite material core and a carbon coating layer, the chemical formula of the sodium ferric pyrophosphate / carbon composite material core is Na (4-x) AxFeyB (2.91-y) (PO4) 2-z / 3P2O7Fz / C, x is greater than or equal to 0.01 and less than or equal to 1, y is greater than or equal to 2.7 and less than 2.91, z is greater than or equal to 1 and less than or equal to 3, A comprises any one or a combination of at least two of Li, K or Ca, and B comprises any one or a combination of at least two of Mg, Al, Zn, V, Co, Mn, Zr, Ti, Cu or Y. According to the invention, the conductivity, rate capability, cycle life and stability of the sodium ferric phosphate pyrophosphate positive electrode material are comprehensively improved through the bulk phase composite carbon and surface carbon-coated dual carbon structure in combination with regulation and control of the sodium ferric phosphate pyrophosphate component.

The application provides a preparation method of a precursor pre-adsorption sodium-supplemented sodium iron phosphate pyrophosphate positive electrode material, uses hydrated iron phosphate as a precursor, and places the precursor in a sodium salt of an organic weak acid sodium supplement solution for impregnation adsorption, and after drying, is mixed with a sodium source, a phosphoric acid source, a pyrophosphoric acid source and a carbon source, and is sintered in an inert atmosphere to obtain a pre-sodium-supplemented Na4Fe3(PO4)2P2O7 / C material. The application also provides a sodium iron phosphate pyrophosphate positive electrode material prepared by using the above method, and a sodium ion battery comprising the material. By impregnating and adsorbing the sodium salt of the organic weak acid sodium supplement on the industrial precursor of the sodium iron phosphate pyrophosphate, the nanoscale dispersion of the sodium supplement is achieved, the toxicity and high gas production of the traditional sodium supplement are avoided from the root, the process is adapted to the existing industrial production line, the first coulomb efficiency and the cycle stability of the sodium iron phosphate pyrophosphate positive electrode material are effectively improved, and the industrial application is promoted.

This invention discloses a highly efficient asymmetric synthesis method for aryl propionic acid drug molecules. The method uses racemic aldehydes as substrates and thiamine pyrophosphate-dependent enzymes as biocatalysts. Electrolysis is performed in a diaphragm-free electrolytic cell under conditions of an external redox dielectric and constant current, in a buffer salt solution and nitrogen atmosphere. This method achieves dynamic kinetic oxidation of aldehydes via bioelectrocatalysis, enabling the high-efficiency and high enantioselectivity synthesis of aryl propionic acid drug molecules. The method eliminates the need for redox agents and additives, is simple to operate, operates under mild reaction conditions, and is green and sustainable. This invention applies bioelectrocatalysis to asymmetric synthesis, providing a green and efficient new enzymatic synthetic route for the asymmetric synthesis of aryl propionic acid drug molecules, which has significant application prospects in the pharmaceutical industry.

The invention discloses a preparation method of a water-resistant and melting-resistant sodium silicate-based fireproof coating, and belongs to the technical field of preparation of fireproof materials and inorganic-organic hybrid coatings. The method comprises the following steps: (1) reacting isophorone diisocyanate with polypropylene glycol to prepare an isocyanate-terminated polyurethane prepolymer; (2) mixing the polyurethane prepolymer with piperazine pyrophosphate to obtain a component A; (3) mixing a sodium silicate aqueous solution with melamine to obtain a component B; and (4) mixing and curing the component A and the component B in proportion to obtain the coating. According to the invention, an isocyanate group in a polyurethane prepolymer and a sodium silicate aqueous solution are subjected to an in-situ chemical reaction, an organic hydrophobic network is constructed on the surface of an inorganic phase, and the water resistance of the coating is remarkably improved. Meanwhile, piperazine pyrophosphate and melamine form an intumescent flame-retardant system, the intumescent flame-retardant system and sodium silicate are synergistically promoted to form a compact and stable intumescent layer at high temperature, and the problems that a traditional water glass coating easily absorbs moisture and melts and flows at high temperature are effectively solved. The method is simple and controllable in process, and the prepared coating has excellent water resistance, fire resistance and heat insulation performance.

The invention discloses a high-compaction-density ferric sodium pyrophosphate positive electrode material and a preparation method thereof, and belongs to the technical field of sodium ion batteries. The method comprises a double-precursor slurry-separate grinding and mixing process and a sodium supplementing-alcohol secondary sanding-presintering-crushing process, and crystal form transformation is inhibited in the whole process, so that the compaction density, the structural stability and the electrochemical performance of the material are remarkably improved, and high-power industrial production is realized. Meanwhile, the invention further discloses a positive pole piece which comprises a positive current collector, the positive current collector is coated with the phosphoric acid ferric pyrophosphate sodium positive electrode material prepared by the method, the compaction density of the positive pole piece can reach 2.27 g / cm < 3 > to the minimum, the cycle performance is remarkably improved, and the positive pole piece has industrialization feasibility of a large-scale energy storage system.

The invention relates to composite carbon coated ferric sodium pyrophosphate, a preparation method and a sodium ion battery. The preparation method comprises the following steps: performing first mixing on a sodium source, an iron source and a phosphorus source in water to obtain a precursor solution; carrying out second mixing reaction on the precursor solution, a first additive and a second additive to obtain precursor sol; adding a carbon source dispersion liquid into the precursor sol to obtain a composite precursor sol; performing vacuum drying; sintering in an inert atmosphere to obtain composite carbon-coated ferric sodium pyrophosphate; a carbon source in the carbon source dispersion liquid comprises a carbon nanotube and graphene oxide; the first additive comprises monobasic acid and / or polybasic acid; the second additive comprises a monohydric alcohol and / or a polyhydric alcohol. On the basis of a sol-gel process, a composite carbon coating layer jointly formed by carbon nanotubes, reduced graphene oxide and amorphous carbon is formed on the surface of sodium ferric phosphate pyrophosphate in situ, so that the rate performance and the cycle performance of sodium ferric phosphate pyrophosphate are synchronously improved.

This invention provides a high-entropy doped composite sodium iron pyrophosphate cathode material, its preparation method, and a battery. The preparation method includes: passing a mixed metal source solution, a phosphorus source mixture, an oxidant solution, and a complexing agent solution into a base liquid to perform a co-precipitation reaction to obtain a precursor material; the mixed metal source solution includes an ferrous source, a nickel source, a cobalt source, a manganese source, a chromium source, and additives, wherein the additives include sodium alginate and / or sodium carboxymethyl cellulose; the precursor material, the sodium source, and the carbon source are sequentially mixed, spray-dried, and sintered to obtain the high-entropy doped composite sodium iron pyrophosphate cathode material. The preparation method of this invention introduces multiple metal elements, additives, and complexing agents during the co-precipitation reaction, enabling multiple metal elements to be uniformly doped into the crystal structure of the material. This utilizes the synergistic effect of high-entropy multiple factors to enhance the structural stability of the material, optimize electron / ion transport dynamics, and improve cycle and high-rate performance.

This invention belongs to the field of soil manganese extraction technology, and discloses a stepwise extraction method and application for manganese species in soil. First, exchangeable manganese is extracted using magnesium chloride; then, manganese carbonate and sulfides are extracted using hydrochloric acid; next, active Mn(III) bound to organic matter is extracted using pyrophosphate solution under alkaline pH; then, manganese oxides are dissolved using hydroxylamine hydrochloride; and finally, manganese bound to crystalline iron and manganese oxides is extracted using sodium dithionite solution. This stepwise extraction scheme accurately quantifies the concentration of active Mn(III) species bound to organic matter in the soil. Experimental results show that the extraction method of this invention can effectively separate different forms of manganese in soil. In particular, PP extraction successfully distinguishes Mn(III) bound to organic matter without introducing interfering substances such as iron minerals that may interfere with dissolution.

The application discloses MS glue, an MS glue additive and a preparation method of the MS glue additive, and the preparation method of the MS glue additive comprises the following steps: dissolving pentamethyl piperidyl alcohol in an organic solvent, heating, and stirring; adding octadecadiene acid dimer, and stirring; adding diisopropyl bis(dioctyl pyrophosphoric acyloxy) titanate, and stirring; heating, and extracting the solvent under reduced pressure to obtain a product. In the technical scheme, the MS glue additive can effectively capture free radicals in a polymer degradation chain reaction, thereby inhibiting a photo-oxidation process, and achieving a light stabilization purpose. Through evaluation, the additive can greatly reduce performance attenuation and yellowing of the MS glue under light aging.

The application relates to F, N co-doped low-sulfur sodium iron pyrophosphate phosphate and a preparation method and application thereof, and belongs to the technical field of sodium ion battery materials, and at least one of the problems of poor rate performance and short cycle life of an existing sodium ion battery is solved. The preparation method comprises the following steps: S1, dissolving a sulfur-free iron source, a sulfur-free sodium source and a phosphorus source in deionized water, stirring and mixing to obtain a mixed solution; S2, adding a complex carbon source and a conventional carbon source into the mixed solution, and performing heating and stirring to obtain a precursor product, wherein the complex carbon source contains F and N; S3, drying the precursor product to obtain a sodium iron pyrophosphate phosphate precursor; and S4, sintering the sodium iron pyrophosphate phosphate precursor to obtain F, N co-doped low-sulfur sodium iron pyrophosphate phosphate. The sodium iron pyrophosphate phosphate positive electrode material has a carbon coating layer, N elements are doped in the carbon coating layer, and F elements are doped in the sodium iron pyrophosphate phosphate, so that the rate performance and the cycle life of the material are improved.

This invention discloses a composition that helps improve sleep and its application in infant formula. The composition comprises plant fermentation products, theanine, magnesium oxide, milk mineral salts, ferric pyrophosphate, vitamin B6, vitamin C, and vitamin D3. The plant fermentation products are obtained by fermenting licorice powder, jujube seed powder, poria cocos powder, angelica powder, and hawthorn powder with *Lactobacillus helveticus* and *Lactobacillus rhamnosus*, followed by sterilization, filtration, concentration, and freeze-drying. This invention employs multi-strain mixed fermentation, and the synergistic effect between different microorganisms can effectively increase the concentration of natural active substances in the extract. The resulting plant fermentation products can effectively enhance the sleep-improving effect of the composition.

The application discloses a positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing iron phosphate, a carbon source, a sodium source and water to prepare a slurry; the mixed iron phosphate contains phosphate and pyrophosphate or phosphate and dihydrogen phosphate; the carbon source contains citric acid; the prepared slurry is grinded to obtain a fine slurry; the fine slurry is sprayed and dried to obtain a solid precursor; and the solid precursor is sintered to obtain the positive electrode material. By controlling the reaction parameters, the mixed iron phosphate containing pyrophosphate or dihydrogen phosphate is synthesized, the amount of citric acid in the subsequent process is reduced, the pore generation rate is reduced, the material compaction density is improved, the method is simple and reliable, and the application prospect is good. The prepared positive electrode material has high specific capacity and high compaction density, and is suitable for preparing a positive electrode of a sodium ion battery.

The invention discloses a preparation method of a polyanion positive electrode material ferric sodium pyrophosphate (NFPP, chemical formula: Na4Fe3 (PO4) 2P2O7) without a physical sanding process, and relates to the technical field of synthesis of inorganic functional materials. According to the method, dependence of a traditional process on physical sanding is broken through, common industrial raw materials are adopted, an iron source is limited to be a mixed system of water-insoluble iron phosphate and ferrous oxalate (the molar ratio is 1: (0.005-0.5)), and the water-insoluble iron phosphate and the ferrous oxalate form a specific proportion and can generate a synergistic effect in a solution to accelerate reaction and dissolution; the molar ratio of sodium to iron to phosphorus is accurately controlled to be (4-4.04): (2.9-3): 4, the self-adaption of pH and raw material ratio (the pH is stabilized at 4-6) is synergistically realized by utilizing the characteristics of the raw materials, and the particle refining and dispersing effects of sanding are replaced by combining chemical complexing, step-by-step feeding and multi-parameter coordinated regulation. The process is highly compatible with an existing mass production process, rapid adaptation can be achieved without modifying a production line, the investment and energy consumption of sanding equipment are omitted, the energy consumption of a unit product is reduced by about 20%, and the comprehensive production cost is reduced by 10% or above; the product is pure-phase NFPP, the particle size D50 is 2-10 microns, the first specific discharge capacity is greater than or equal to 105mAh / g, the capacity retention rate after 500 cycles is greater than 95%, and the product is suitable for the fields of energy storage batteries, power batteries and the like and has huge industrial potential.

The application discloses a production process of electroplating grade potassium pyrophosphate, which uses potassium carbonate and diaphosphorus pentoxide as raw materials, and adds a catalyst to react in a high-pressure reaction kettle. After the reaction is completed, water is added for dissolution, and the pH value of the slurry is controlled to be 9.0-10.0. After being filtered through a precision filter, the slurry is punched into a slurry storage tank, and the slurry storage tank is maintained at 75-95 DEG C. The slurry in the storage tank is punched into an evaporation and concentration device for concentration, and then the concentrated liquid is punched into a continuous crystallization device for continuous crystallization operation. After centrifugal treatment, the filtrate is recycled into the evaporation and concentration device. The potassium pyrophosphate crystals are subjected to vacuum drying treatment in a vacuum drying equipment, and then are packaged into finished products after being crushed and sieved. The potassium pyrophosphate crystals obtained by the application have high purity, less caking phenomenon, and stable and controllable product quality.

The invention discloses a pomegranate-shaped core-shell structure tin pyrophosphate negative electrode material as well as a preparation method and application thereof, and belongs to the technical field of electrochemical energy storage materials. The preparation method comprises the following steps: mixing tetravalent tin salt and a phosphonic acid organic ligand, and carrying out hydrothermal reaction to obtain a tin-based metal organic framework precursor; the phosphonic acid organic ligand is selected from one or two of phenylphosphonic acid or (pyridine-2-yl methyl) phosphonic acid; and carrying out heat treatment on the tin-based metal organic framework precursor at 550-700 DEG C to obtain the pomegranate-shaped core-shell structure tin pyrophosphate negative electrode material. The tetravalent tin salt and the specific phosphonic acid ligand are used for constructing the precursor, and the Kirkendall effect in the pyrolysis process is utilized to form a unique core-shell structure, so that the negative electrode material shows excellent cycling stability under high current density when being used for the potassium ion battery or the sodium ion battery.

The invention discloses a multi-carbon-source constructed carbon-coated ferric sodium pyrophosphate positive electrode material and a preparation method thereof, and belongs to the field of positive electrode materials. According to the material, a carbon coating layer formed by multiple carbon sources is constructed on the surface of a sodium ferric phosphate pyrophosphate positive electrode material, and the multiple carbon sources comprise an inorganic carbon source, an organic carbon source and small organic molecules; the preparation method comprises the following steps: (1) mixing an iron source, a sodium source and a multi-carbon source in a solvent, grinding, and spray-drying to obtain a spray material; and (2) sintering the spray material to obtain the product. According to the invention, through introduction of small organic molecules, inorganic carbon sources and organic carbon sources are bonded in a covalent bond form, so that an unstable carbon layer formed by simple physical interaction of the existing inorganic carbon sources and organic polymer carbon sources is broken, and the structural stability of the carbon coating layer in the circulation process is greatly improved. In addition, the formation of the interface covalent bonds can be used as an electron transmission path, and the electron transmission is accelerated, so that the electron conductivity of the positive electrode material is enhanced.

The invention relates to the field of lithium battery processing, and discloses high-compaction iron phosphate, a preparation method thereof and lithium iron phosphate. The preparation method comprises the following steps: 1) mixing and reacting a phosphoric acid-pyrophosphoric acid mixed solution with iron powder, and then mixing with a ferric iron source to obtain a solution containing ferric ions; wherein in the phosphoric acid-pyrophosphoric acid mixed solution, the concentration of phosphate radical is 7 to 12 mol / L, and the concentration of pyrophosphate radical is 0.01 to 0.1 mol / L; the molar ratio of the iron powder to the pyrophosphate radical is (2-8): 1; and 2) carrying out first filter pressing on the solution containing the ferric ions, reacting the obtained filtrate at 80-120 DEG C for 0.5-6 hours, then reacting at 30-60 DEG C for 0.5-2 hours, and sequentially carrying out second filter pressing, water washing, flash drying and sintering. The preparation method adopts an iron phosphate one-step synthesis route, and is short in flow and simple in process.

This invention relates to a method for preparing sodium iron pyrophosphate material. The preparation method includes the following steps: S1, mixing waste phosphoric acid, a trivalent iron source, and an acidic compound to react and obtain an iron-based phosphate precursor slurry; S2, centrifuging the iron-based phosphate precursor slurry to obtain a supernatant and an iron phosphate precipitate; S3, washing the iron phosphate precipitate and dispersing it in water to obtain an iron phosphate slurry; preparing a sodium dihydrogen phosphate slurry from the supernatant; mixing the iron phosphate slurry, sodium dihydrogen phosphate slurry, a sodium source, and a carbon source to react and obtain the sodium iron pyrophosphate material. The preparation method provided by this invention has a simplified process flow, significantly reduced energy consumption, and significantly improved resource utilization, achieving closed-loop utilization of all components. In addition, the process controllability is improved, and the obtained sodium iron pyrophosphate material exhibits excellent performance.

The invention provides a ferric sodium phosphate pyrophosphate secondary particle which comprises a plurality of ferric sodium phosphate pyrophosphate primary particles, and the ferric sodium phosphate pyrophosphate secondary particle is provided with a plurality of pores formed in the surface of the ferric sodium phosphate pyrophosphate secondary particle, and the ratio of the total area of the plurality of pores to the surface area of the ferric sodium pyrophosphate secondary particles ranges from 4% to 8%.

The invention relates to the technical field of high polymer materials, and discloses a regenerated rubber composite material with high mechanical property and a preparation method thereof. The regenerated rubber composite material is prepared by mixing the following raw materials in parts by weight: 100 parts of regenerated rubber and 0.3-1.5 parts of a titanate coupling agent, the titanate coupling agent is a chelating type titanate coupling agent and / or a mono-alkoxy type titanate coupling agent, and the titanate coupling agent contains a pyrophosphate acyloxy group. By adding the titanate coupling agent, the tensile product resistance and tear resistance of the regenerated rubber can be improved at the same time. And the process is simple, no complex equipment is needed, and the tensile product resistance and tear resistance can be improved through the titanate coupling agent no matter in preparation or finished regenerated rubber.

The invention provides composite ferric sodium pyrophosphate, a preparation method and application thereof and a sodium ion battery. The chemical formula of the composite ferric sodium pyrophosphate is Na < y > Fe < 3-x > M < x > P < 4 > O < 15-y > F < y >, and M is at least one of Zn, Cu, Ni, Mn, Mg and Ti; 0.02 < = x < = 0.1, 0.5 < = y < = 3; according to the composite ferric sodium phosphate pyrophosphate disclosed by the invention, the molar ratio of metal to phosphorus in the composite ferric sodium phosphate pyrophosphate is 0.75: 1 through control of reaction conditions of pH and temperature and multi-element regulation and control, and when the composite ferric sodium phosphate pyrophosphate is used as a precursor to synthesize a sodium-ion battery positive electrode material, an additional phosphorus source is not required to be added; the sintering diffusion resistance is reduced, and the compaction density of the obtained material is higher; and meanwhile, through multi-element regulation and control, the resistivity of the material powder is lower, and the rate capability is better.

The invention relates to a sliding material based on PTFE polymer with a filler to improve the friction properties, wherein the filler comprises at least one phosphate, in particular calcium phosphate, calcium pyrophosphate, magnesium phosphate, magnesium pyrophosphate, lithium phosphate, hydroxyapatite or combinations thereof, and at least one metal sulfide, wherein the proportion of metal sulfide is > 2%. The invention also relates to the use of the sliding material.

The invention relates to the technical field of lithium ion batteries, and discloses a nickel-rich ternary positive electrode material as well as a preparation method and application thereof. The preparation method of the nickel-rich ternary positive electrode material provided by the invention comprises the following steps: S1, mixing a ternary positive electrode material precursor with a lithium salt, and sintering for the first time to obtain an intermediate product; s2, mixing the intermediate product, aluminum salt, pyrophosphoric acid and ethanol to obtain a mixed solution; and S3, drying the mixed solution, sintering for the second time, and cooling to obtain the nickel-rich ternary positive electrode material. According to the preparation method provided by the invention, the ion transport layer with high ionic conductivity is constructed on the surface of the positive electrode in situ, so that the migration kinetics of Li < + > is improved, adverse side reactions at an electrode / electrolyte interface are inhibited, and the capacity and cycle performance of the nickel-rich ternary positive electrode material under high magnification are improved.

The invention relates to freshening and whitening toothpaste and a preparation method thereof. The freshening and whitening toothpaste comprises the following raw materials: hydrated silica, disodium dihydrogen pyrophosphate, a PVM / MA copolymer, color repair particles and an auxiliary agent, the color repair particles are prepared from mannitol, microcrystalline cellulose, CI 74160, cetyl alcohol, corn starch, ethyl cellulose and hydroxypropyl methyl cellulose. Through combination of triple whitening methods, tooth whitening is realized, a color locking film is formed on the surface of the whitened tooth, color spots and color spots are prevented, and the tooth yellowing risk is reduced. Experiments prove that the freshening and whitening toothpaste disclosed by the invention has an effect of freshening breath, the temperature of the inner wall of the oral cavity can be remarkably reduced by 4.5 DEG C by using the toothpaste, and the toothpaste has no irritation to the mucous membrane of the oral cavity and is high in safety.

The invention relates to the technical field of cables, and provides a flame-retardant aluminum alloy core low-voltage control cable and a preparation method thereof. A flame-retardant aluminum alloy core low-voltage control cable sequentially comprises a cable core, a wrapping layer and a sheath layer from inside to outside. The cable core sequentially comprises an aluminum alloy conductor, an insulating layer, an armor layer and an isolating layer from inside to outside; the sheath layer comprises the following raw materials in parts by weight: 100-120 parts of polyethylene, 25-35 parts of an ethylene-vinyl acetate copolymer, 6-8 parts of a cycloolefin copolymer, 35-45 parts of a flame retardant, 2-4 parts of an antioxidant, 1-3 parts of a lubricant and 3-5 parts of a plasticizer; the flame retardant is of a core-shell structure, the inner core is hydromagnesite, and the outer shell is dodecylamine pyrophosphate; the flame retardant is prepared from the following raw materials in parts by weight: 100 parts of hydromagnesite, 20 to 30 parts of pyrophosphoric acid and 25 to 35 parts of lauryl amine. According to the technical scheme, the problem that a low-voltage control cable in the prior art is poor in flame retardant property is solved.

The invention provides a sodium battery positive electrode material formed by compactly assembling flaky ferric sodium phosphate pyrophosphate and a preparation method thereof, the positive electrode material comprises ferric sodium phosphate pyrophosphate and carbon, the molecular formula of the ferric sodium phosphate pyrophosphate in the positive electrode material is Na4Fe3 (PO4) 2P2O7, and the carbon content of the positive electrode material is 1.0-2.5 wt%; the positive electrode material is assembled by flaky ferric sodium phosphate pyrophosphate, the size of the flaky ferric sodium phosphate pyrophosphate is 200-800nm, the sodium battery positive electrode material further comprises a connector of the flaky ferric sodium phosphate pyrophosphate, the connector is ferric sodium phosphate pyrophosphate without a specific shape, and the shape of the connector is determined by a gap structure among the flaky ferric sodium phosphate pyrophosphate. According to the preparation method, the anhydrous iron-phosphorus compound is adopted as the precursor, accurate regulation and control of the micromorphology of the precursor are realized by controlling the grinding particle size, and compact assembly and forming of the flaky ferric sodium pyrophosphate are realized through low-temperature sintering, so that the compaction density of the material is improved under the condition that the electrochemical performance of the material is not influenced.