304 results about "Pyrophosphate" patented technology

The invention relates to a preparation method of a nickel ion doped modified ferric sodium pyrophosphate positive electrode material, and belongs to the technical field of sodium ion battery positive electrode materials. The nickel ion doped modified ferric sodium pyrophosphate positive electrode material is prepared by adopting an integrated process system of liquid phase uniform mixing, spray granulation and precise segmented calcination. According to the process system, atomic-scale uniform doping of nickel ions and a specific microstructure of a precursor are realized through spray drying, and a plurality of inherent key technical problems of low electronic conductivity, low ion diffusion rate, impurity phase generation and the like of an NFPP material are solved together through a synergistic effect with a subsequent calcining process; furthermore, the discharge capacity of the ferric sodium phosphate pyrophosphate composite material at high rate is improved, so that the battery has relatively high cycling stability.

The invention belongs to the field of biosynthesis, and in particular relates to LBD (Levandanenediol Pyrophosphate) synthase and engineered yeast for producing sclareol. In order to solve the problem that in the prior art, the sclareol biosynthesis yield is generally low, LSLPPs mutant containing at least one mutation of D730L, D374L, N674L or G379M is obtained by performing mutation and optimization on LSLPPs pyrophosphate synthase, and the mutant is used for sclareol synthesis. Meanwhile, in order to solve the problem of genetic instability caused by free plasmid expression of part of saccharomyces cerevisiae strains, a sclareol synthesis pathway is constructed in a yeast genome, and meanwhile, an acetyl coenzyme A synthesis pathway, an MVA pathway and a sclareol synthesis pathway are enhanced; chassis bacteria for synthesizing sclareol are modified in a manner of knocking out part of transcription inhibition factors, and the yield of a 5L fermentation tank reaches 26.11 g / L and is greatly improved compared with the prior art.

The embodiment of the invention provides a polyanionic positive electrode material and a preparation method thereof, a positive electrode plate, a secondary battery and an electric device, and belongs to the technical field of secondary batteries. The polyanionic positive electrode material is ferric sodium pyrophosphate, the polyanionic positive electrode material comprises primary particles and secondary spheres formed by the primary particles, and the primary particles comprise primary particles with the particle size Dv50 being d1 and primary particles with the particle size Dv50 being d2, d1gt; d2, the secondary sphere is of a core-shell structure, a core is of a porous structure, and a shell layer is of a compact structure. The polyanionic positive electrode material is relatively high in compaction density, and has the advantages of good cycle performance and good rate capability.

The invention discloses sulfate-erosion-resistant metakaolin-slag-based geopolymer concrete, belongs to the technical field of concrete, and aims to solve the problems that the corrosion resistance of traditional silicate concrete is ineffective and the adaptability of conventional alkali-activated concrete is insufficient in a special environment. The concrete comprises the following components in parts by weight: 60-90 parts of a cementing material, 120-170 parts of aggregate, 15-30 parts of a composite activator, 2-8 parts of a function regulator and the like, the cementing material is prepared from nano TiO2 / KH-550 composite modified metakaolin, slag and silica fume-coal gangue powder-HAP composite powder; the aggregate comprises modified limestone macadam (soaked and dried by a sodium dihydrogen phosphate solution) and river sand; the composite exciting agent comprises water glass, sodium hydroxide, sodium pyrophosphate, propylene glycol and the like; the function regulator comprises superfine fly ash, a naphthalene water reducer, HPMC (Hydroxy Propyl Methyl Cellulose) and boric acid. Through the synergistic effect of the components, the sulfate corrosion resistance, the mechanical property and the environmental adaptation performance of the concrete are improved, and the concrete is suitable for engineering construction under the service environment of high-concentration sulfate and the like.

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 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.

The invention discloses a method for treating a metal surface through ethylene glycol butyl ether after a fire disaster. The treatment method comprises the following steps that modified ethylene glycol butyl ether is prepared; sequentially adding modified ethylene glycol butyl ether serving as a main chemical solution into the reaction kettle according to the quantitative percentage, and carrying out mixed reaction; standing the mixed chemical solution in the step S2 for 10-20 minutes, and adding water to dilute the mixed solution according to the remaining percentage of the volume of the reaction kettle; the ethylene glycol butyl ether is modified and serves as a main component of the cleaning solution, the sodium phosphate, the epichlorohydrin, the sodium pyrophosphate and the trichloroethylene are mixed according to a proper proportion, a proper amount of water is added for dilution, and the cleaning solution is obtained. Dirt formed by fire disasters on the metal surface can be effectively removed, and metal objects cannot be damaged.

The invention relates to the technical field of sodium-ion batteries, and discloses a Ni and Bi co-doped carbon-coated ferric sodium pyrophosphate material, a positive pole piece, a sodium-ion battery and electric equipment. The molecular formula of the ferric sodium pyrophosphate material is 0 < x < = 1, and 0 < y < = 1. According to the iron-site double-doped carbon-coated ferric pyrophosphate sodium material provided by the invention, the iron site part is respectively substituted by nickel and bismuth, the Ni and Bi co-doped carbon-coated ferric pyrophosphate sodium material is synthesized by adopting a high-temperature solid-phase method, the preparation process is simple and small, the equipment cost and energy consumption are greatly reduced, and the generation of inactive NaFePO4 can be reduced. The sodium-ion battery prepared by using the prepared ferric sodium pyrophosphate material as a positive electrode material is good in conductivity, large in specific capacity, high in rate characteristic and long in cycle life, and the inherent defects of the ferric sodium pyrophosphate are overcome.

The invention discloses a formula and a preparation method of a glutinous rice sausage. The preparation method comprises the following steps: stir-frying glutinous rice and salted meat; the stir-fried glutinous rice comprises glutinous rice, fried lard oil, minced garlic, trehalose, refined salt and monosodium glutamate; the salted meat comprises pork, chopped salted fat dices, water, white granulated sugar, refined salt, monosodium glutamate, sodium tripolyphosphate, sodium pyrophosphate and auxiliary materials; the preparation of the stir-fried glutinous rice comprises hot frying and cold frying. The flavor of the glutinous rice sausages is remarkably improved, the glutinous rice in the sausages absorbs grease of the stuffing, particles are full, the taste is fragrant, sweet, soft and glutinous, and the overall flavor is richer and more harmonious.

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.

This invention discloses a hierarchical porous graphene oxide-coated sodium iron phosphate pyrophosphate composite material, its preparation method, and a method for preparing a sodium-ion battery cathode using the aforementioned hierarchical porous graphene oxide-coated sodium iron phosphate pyrophosphate composite material. This invention utilizes the efficient electron and ion transport pathways of hierarchical porous graphene oxide to modify the sodium iron phosphate pyrophosphate cathode material, improving its ionic and electronic conductivity. Simultaneously, the hierarchical porous graphene oxide acts as a protective layer, reducing the volume expansion of sodium iron phosphate pyrophosphate during charge and discharge processes and increasing the material's cycle stability.

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 present application provides a positive electrode active material, a preparation method thereof, a positive electrode sheet comprising the same, a secondary battery, and an electric device. The positive electrode active material comprises an inner core and a shell covering the inner core, the inner core comprises Li m A x Mn I‑y B y P 1‑z C z O 4‑n D n , and the shell comprises a crystalline pyrophosphate Li a MP2O7 and / or M b (P2O7). The positive electrode active material of the present application can make the secondary battery have a higher energy density, and meanwhile improve the cycle performance, safety performance, and / or rate performance. p B q O r and carbon, and the shell comprises one or more coating layers, each coating layer independently comprises one or more of a crystalline pyrophosphate Li a MP2O7 and / or M b (P2O7) c , a crystalline phosphate XPO4, a crystalline borate Y p BqO r and carbon. The positive electrode active material of the present application can make the secondary battery have a higher energy density, and meanwhile improve the cycle performance, safety performance, and / or rate performance.

The invention discloses a preparation method of a high-purity ferric sodium pyrophosphate (Na4Fe3 (PO3) 2P2O7-Pure, hereinafter referred to as NFPP-P) positive electrode material and an application of the positive electrode material in a sodium ion battery. The invention relates to an innovative sectional gradient calcining process, which is combined with a spray drying precursor synthesis technology to successfully realize effective regulation and control of material phase purity. Experiments show that the process can significantly inhibit generation of a sodium ferric phosphate impure phase by controlling a calcination temperature curve, and the electrochemical performance of the positive electrode material is improved. The method provides a new process route for developing a high-performance sodium ion battery positive electrode material, and has important application value in the field of low-cost and long-cycle-life energy storage devices.

A method for crosslinking a moisture-curable polymer composition comprises the following steps: producing a moisture-curable polymer composition of a silane-functionalized polyolefin and an expandable flame retardant mixture, wherein the expandable flame retardant mixture comprises piperazine pyrophosphate and a phosphoric acid compound in an amount of 15% to 55% by weight, based on the total weight of the expandable flame retardant mixture. The method also comprises the step of using the expandable flame retardant mixture to catalyze a moisture-induced crosslinking reaction of the silane-functionalized polyolefin to form a moisture-curable polymer composition.

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.

Compositions and methods are provided to increase the palatability of dry dog foods. A dry dog food composition can comprise about 0.6 wt % to about 1.2 wt % of a pyrophosphate, where the pyrophosphate is incorporated into at least one of a basal body of the dry dog food composition or a coating applied to the dry dog food composition.

The application provides a positive electrode active material, a preparation method thereof, a positive electrode sheet containing the positive electrode active material, a secondary battery and an electric device, the positive electrode active material has a core-shell structure, comprising an inner core and a shell covering the inner core, wherein the chemical formula of the inner core is Li a A x Mn 1‑y B y P 1‑z C z O 4‑n D n The shell comprises a first coating layer covering the inner core and a second coating layer covering the first coating layer, the first coating layer comprises pyrophosphate MP2O7 and phosphate XPO4, and the second coating layer contains carbon. The positive electrode active material can make the secondary battery and the electric device have high energy density and good cycle performance, rate performance and safety performance.

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 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 relates to a method for detecting phosphate, pyrophosphate and tripolyphosphate in diquafosol sodium, which has the advantages of high sensitivity, strong specificity, good accuracy and simple and rapid operation, can effectively analyze the drug quality, and has practical significance for ensuring the safety and reliability of diquafosol sodium.

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.

This disclosure provides a pyrophosphate-free tin-copper co-plating additive, its preparation method, a tin-copper co-plating solution, and its application. The aforementioned tin-copper co-plating additive includes a primary complexing agent and an auxiliary complexing agent. The primary complexing agent is a modified branched polyamine polymer, which is generated by reacting a branched polyamine polymer with an oxazolyl carboxylic acid compound. The modified branched polyamine polymer contains amino ligands and nitrogen-oxygen mixed polydentate ligands. The auxiliary complexing agent is a cationic oligosaccharide complex. This tin-copper co-plating additive, with its amino ligands and nitrogen-oxygen mixed polydentate ligands in the modified branched polyamine polymer, can effectively regulate tin-copper co-plating, achieving a high tin, low copper deposition effect. This allows tin and copper to co-deposit at a uniform rate, effectively refining tin-copper grains, forming a tin-whisker-free, uniformly crystallized, flat, and dense tin-copper co-plating layer; it is also environmentally friendly.

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.