888 results about "Pyrophosphate" patented technology

The invention provides a sodium ferric pyrophosphate positive electrode material cooperatively doped with anions and cations, a preparation method of the sodium ferric pyrophosphate positive electrode material and a sodium ion battery, and relates to the field of sodium ion batteries. The anion and cation synergistically doped ferric sodium phosphate pyrophosphate positive electrode material comprises an inner core and a coating layer covering the outer surface of the inner core, the inner core comprises ferric sodium phosphate pyrophosphate, the coating layer comprises carbon, the chemical formula of the ferric sodium phosphate pyrophosphate is Na4-2yFe2.91-xQx (PO4) 2-yP2O7Fy, x is more than 0 and less than or equal to 0.3, and y is more than or equal to 0.03 and less than or equal to 0.08; q comprises at least one of Sn, Ni, Cu, Mg and Mn. The introduced Q positive ions and F negative ions can keep the crystal structure of the body material stable, and the positive ions and the negative ions have a synergistic effect, so that the band gap of the positive electrode material is reduced, the state density near the Fermi level of the positive electrode material is increased, the conductivity of the positive electrode material is enhanced, the specific capacity of the positive electrode material is improved, and the rate and the cycle performance are promoted.

The present invention relates to a sodium-ion battery material, and specifically relates to a sodium ferric phosphate pyrophosphate composite material, and a preparation process, evaluation method and process optimization method therefor and the use thereof. The sodium ferric phosphate pyrophosphate composite material has a spinel-type NaFePO4 phase; and in an XRD diffraction pattern obtained by subjecting the sodium ferric phosphate pyrophosphate composite material to XRD diffraction using CuKα radiation, there are a characteristic diffraction peak T of sodium ferric phosphate pyrophosphate and a characteristic diffraction peak O of spinel-type NaFePO4 at 2θ of 33.6±0.2° and 32.8±0.2°, respectively, the peak intensities thereof are respectively IT and IO, and the diffraction peak intensity ratio Ir is equal to IT / IO, wherein 6.19≤Ir≤13.

The invention provides a doped and coated composite sodium battery positive electrode material as well as a preparation method and application thereof. The doped and coated composite sodium battery positive electrode material comprises an inner core and a coating layer on the surface of the inner core, the chemical general formula of the inner core is NabNixFeyMnzMjO2, x + y + z + j = 1, 0.2 < = x < = 0.6, 0.2 < = y < = 0.5, 0.2 < = z < = 0.5, 0 < j < = 0.2, 0.8 < = b < = 1.2; the coating layer comprises a ferric sodium pyrophosphate material; raw materials for preparing the doped and coated composite sodium battery positive electrode material comprise an inner core, a phosphoric acid ferric sodium pyrophosphate precursor material and a sodium source. The metal elements are doped in the inner core, and the surface is coated with the ferric sodium pyrophosphate material with relatively high stability, so that the inner core can be prevented from being in direct contact with an electrolyte, and the cycle performance of the sodium battery positive electrode material is improved.

The invention relates to an anti-static PP composite material and a preparation method thereof, and belongs to the technical field of high polymer materials. The antistatic PP composite material is prepared from the following components in parts by weight: 60 to 80 parts of PP resin, 10 to 20 parts of glass fiber, 0.1 to 0.5 part of a lubricant, 0.3 to 2 parts of a modified antistatic agent, 0.5 to 1.5 parts of a modified flame retardant and 0.2 to 0.8 part of an antioxidant, in the modified antistatic agent, an alkanolamide bond intermediate forms a conductive film, so that the resistivity is reduced, static dissipation is promoted, the material is endowed with lubricity, and the generation of static electricity is reduced; in addition, maleic anhydride forms a conductive layer and cooperates with quaternary ammonium salt to enhance hydrophilicity and accelerate charge transfer; a piperazine pyrophosphate derivative in the modified flame retardant and a phosphorus-nitrogen flame retardant cooperate to construct an expanded carbon layer to isolate a fire source and oxygen, so that the service life is prolonged; the anti-static PP composite material prepared by the invention not only has a good anti-static effect, but also has excellent flame-retardant and tensile properties.

The invention discloses a modified carbon-coated sodium manganese ferric phosphate pyrophosphate / sodium ferric phosphate pyrophosphate positive electrode material as well as a preparation method and application thereof, and relates to the technical field of new energy materials. The preparation method comprises the following steps: preparing MnFe-MOF from a manganese source, a first iron source and a first organic ligand under a hydrothermal reaction; a second iron source, the MnFe-MOF and a second organic ligand are subjected to a hydrothermal reaction, and MnFe-MOF / Fe-MOF is obtained; uniformly mixing with a sodium source and a phosphorus source, and sintering to obtain a positive electrode material; and carrying out high-temperature gas-phase etching treatment to obtain the fluorine-doped carbon-coated modified sodium manganese ferric phosphate pyrophosphate / sodium ferric phosphate pyrophosphate positive electrode material. The material disclosed by the invention has a coating modified structure, so that an interface side reaction caused by direct contact between sodium ferromanganese phosphate and an electrolyte can be effectively avoided, a manganese dissolution phenomenon is reduced, and the structural stability of the material is improved; and meanwhile, the material has high conductivity, excellent structural stability, excellent long cycle life and excellent rate capability.

The invention belongs to the technical field of new energy materials, and particularly relates to a low-sulfur metal cation doped ammonium manganese ferric phosphate precursor, carbon-coated modified sodium manganese ferric pyrophosphate and a preparation method and application thereof. According to the invention, the low-sulfur metal cation doped ammonium manganese ferric phosphate precursor is successfully prepared. A proper amount of phosphoric acid source is added into the prepared metal cation doped ammonium manganese ferric phosphate precursor for treatment, so that the sulfur content of the precursor is remarkably reduced, and the molar ratio of manganese, iron, doped elements and phosphorus elements is regulated and controlled to be slightly smaller than 1. The atomic-scale distribution of elements in the precursor is realized, the tap density is also improved, and the subsequent preparation of a high-performance carbon-coated modified manganese ferric sodium phosphate pyrophosphate material is facilitated. The sodium ion battery constructed based on the material has excellent charge-discharge capacity, capacity retention ratio and cycling stability. In addition, the preparation method of the precursor is simple and convenient to operate and easy to control, and has the advantage of wide application.

The invention relates to the technical field of sodium ion battery positive electrode materials, in particular to a carbon-coated sodium ferric phosphate pyrophosphate positive electrode material and a preparation method and application thereof.The preparation method includes the steps that carbon nanotubes and an organic carbon source serve as carbon sources to prepare two kinds of sodium ferric phosphate pyrophosphate particles, and the two kinds of particles are mixed in proportion and then sintered to obtain the carbon-coated sodium ferric phosphate pyrophosphate positive electrode material. In the carbon layer coated on the surface of the material, the carbon nanotubes and the organic carbon source exert respective conductive advantages to form a strong conductive network, so that the conductivity of the material is improved, and the overall structural rigidity of the material is enhanced.

The invention discloses a vanadium-doped modified ferric sodium pyrophosphate material based on spray drying as well as a preparation method and application of the vanadium-doped modified ferric sodium pyrophosphate material. The material has a spherical porous morphology, and the particle size is 1-10 microns; the chemical formula is Na (4-x) Fe (3-x) Vx (PO4) 2P2O7, wherein x is more than 0 and less than or equal to 0.1. The material is prepared by adopting a spray drying method, and atomic-scale mixing of vanadium and iron is ensured through a uniform and stable complexing ion solution; and the formation of porous spherical morphology is promoted through the volatilization of the acidic base solution in the rapid drying process. A spray drying method and a trace vanadium doping technology are combined, so that more active sodium sites in the ferric sodium phosphate pyrophosphate positive electrode material can be activated, the reversible de-intercalation sodium capacity can be improved, sodium ion diffusion can be promoted, the polarization voltage can be reduced, and the cycling stability of the material can be improved.

The invention discloses a ferric sodium pyrophosphate positive electrode material, a preparation method thereof and a battery, and relates to the technical field of batteries. Pre-sintering is performed; sanding and spray drying; and high-temperature sintering. Wherein the pH value of the reaction is controlled by using a Tris-HCl buffer solution in the hydrothermal reaction, so that the precursor is uniformly crystallized and has high crystallinity, and low-temperature segmented presintering is adopted later, so that the compaction density of the material can be controlled, and the related electrical properties of the material are relatively good. In the preparation process, a carbon source and a doping element are supplemented twice, so that carbon coating is uniform in the sintering process, the compaction density of the NFPP positive electrode material is further improved, the properties such as theoretical specific capacity of the positive electrode material are better through doping and carbon coating modification, and the high-compaction and high-capacity ferric sodium pyrophosphate positive electrode material is obtained.

The invention belongs to the technical field of preparation of electrode materials, and particularly relates to a high-tap-density spherical ferric sodium pyrophosphate electrode material and a preparation method thereof. According to the preparation method, a uniform precursor is prepared by utilizing solution gel, and a strategy of combining spray drying with secondary sintering is adopted, so that uniform carbon coating and doping modification of ferric sodium pyrophosphate can be successfully realized, and the strategy provides an important experimental basis for an industrialization process of a sodium ion battery. And the method has great potential of large-scale preparation.

The invention provides a sodium ferric phosphate pyrophosphate composite material, a preparation method and application thereof, and a sodium ion battery, and relates to the technical field of positive electrode materials, the preparation method comprises the following steps: carrying out solid phase mixing on carbon-coated sodium ferric phosphate pyrophosphate and an organic carbon source, and then carrying out sintering treatment to obtain the sodium ferric phosphate pyrophosphate composite material; the temperature of the sintering treatment is 400-580 DEG C. The technical problems that in the prior art, according to a carbon source coating method, carbon source coating is not uniform, the porosity between materials is difficult to effectively reduce, the compaction performance of the materials cannot be remarkably improved, and the crystal structure of the materials is prone to change are solved, and the purposes of reducing the powder resistance of the materials and improving the compaction performance of the materials are achieved. The carbon coating uniformity is effectively improved, the porosity of the material is effectively reduced, the compaction performance of the material is remarkably improved, the water absorption of the material is reduced, and the crystal structure of the material is improved, so that the technical effect of comprehensively improving the performance of the material is achieved.

The invention provides a modified ferric sodium phosphate pyrophosphate positive electrode material and a preparation method and application thereof, the modified ferric sodium phosphate pyrophosphate positive electrode material comprises a ferric sodium phosphate pyrophosphate positive electrode material and a carbon and sodium ion conductor, the carbon and sodium ion conductor is enriched on the surface and grain boundary of the ferric sodium phosphate pyrophosphate positive electrode material in a uniform composite phase, and the sodium ion conductor is NaxMOy. A composite phase material formed by carbon and a sodium ion conductor is used for coating primary particles and secondary particles of the positive electrode material, a three-dimensional conductive / conductive ion network is formed on the grain boundary and the surface of the material, and the charge and ion transmission rate of the material is high; and the three-dimensional coating layer can protect the material from being eroded by electrolyte, the structure stability is good, and the cycle performance and the rate performance of the material are excellent.

This application provides a secondary battery, a battery module, a battery pack, and an electric apparatus. The secondary battery includes a positive electrode plate and a non-aqueous electrolyte, where a positive electrode active material includes a core and a shell enveloping the core, the core including Li1+xMn1-yAyP1-zRzO4 and the shell including a first coating layer enveloping the core and a second coating layer enveloping the first coating layer, where the first coating layer includes a pyrophosphate MP2O7 and a phosphate XPO4, and the second coating layer includes carbon; and the non-aqueous electrolyte includes a first additive, the first additive including one or more from a group consisting of compounds shown in formula 1 and compounds shown in formula 2. Use of the positive electrode active material or the combination of the positive electrode active material and the non-aqueous electrolyte improves the rate performance, cycling performance, and high-temperature stability of lithium manganese phosphate secondary batteries.

A positive electrode material, and a preparation method therefor and the use thereof. The positive electrode material has a core-shell structure, wherein a core part comprises a carbon-coated Cu2+-doped iron-based phosphate sodium-ion material, and a shell layer is CuO. The iron-based phosphate sodium-ion material is selected from ferric sodium pyrophosphate, ferric sodium phosphate or ferric sodium phosphate pyrophosphate. The preparation method for the positive electrode material comprises: mixing the carbon-coated iron-based phosphate sodium-ion material, a copper source and a first solvent, and then subjecting the mixture to first drying and first calcination.

The invention provides a polyanionic precursor, a sodium-ion battery positive electrode material, a preparation method of the sodium-ion battery positive electrode material, a sodium-ion battery and electric equipment, and relates to the field of sodium-ion batteries. The polyanionic precursor contains a substance of which the chemical general formula is NaqMm + nM'wPxOy.zH2O. The preparation method of the polyanionic precursor comprises the following steps: mixing a metal salt containing M < 2 + > and a first phosphorus source containing pyrophosphate to obtain a mixed solution, and reacting to obtain a mixed solution of pyrophosphate containing divalent metal M; and adding an oxidizing agent and a second phosphorus source for reaction, carrying out solid-liquid separation, and drying the separated solid to obtain the polyanionic precursor. The polyanionic precursor is high in tap density, and the prepared sodium ion battery positive electrode material is high in purity and excellent in electrochemical performance. The polyanionic precursor provided by the invention contains a small amount of insoluble Na, so that a sodium source can be saved when a positive electrode material is prepared.

The invention provides a Na / P double-site doped phosphoric acid ferric sodium pyrophosphate / carbon positive electrode active material and a preparation method and application of the Na / P double-site doped phosphoric acid ferric sodium pyrophosphate / carbon positive electrode active material. The material comprises a Na / P double-site doped ferric sodium pyrophosphate base material and a carbon coating layer coating the surface of the base material, the general formula of the base material is Na (4-x) MxFe3 (PO4) 2-y (QO4) y (P2O7), 0 lt, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 X is less than or equal to 0.4, 0lt; y < = 0.2; m is at least one of K, Li, Mg, Ca and Sr, and Q is at least one of Si, Ge, B and S; specific elements are introduced to the Na site and the P site to form a synergistic doping structure, so that the crystal structure and charge distribution are regulated and controlled, and the electrochemical performance of the material is further improved; the material disclosed by the invention is simple and convenient to prepare, wide in raw material source, suitable for electrochemical energy storage systems such as sodium ion batteries and the like, and excellent in rate capability and long in cycle life.

The invention discloses super-hydrophobic high-thermal-stability piperazine pyrophosphate and a preparation method thereof.The super-hydrophobic high-thermal-stability piperazine pyrophosphate comprises piperazine pyrophosphate, the surface of piperazine pyrophosphate is coated with a vesicle structure, and the vesicle structure is a self-assembly structure obtained after alcoholysis reaction of a polysulfide silane compound and piperazine pyrophosphate. According to the sulfur-containing silane material with piperazine pyrophosphate coated with the vesicle structure, piperazine pyrophosphate has super-hydrophobic performance due to the vesicle structure, super-hydrophobic durability is achieved, good water resistance and extremely low moisture absorption can be kept in a high-humidity environment, and the problem that piperazine pyrophosphate powder absorbs moisture and is agglomerated can be solved. The vesicle structure has the effects of blocking heat and substance transfer and reducing the thermal oxidation rate of PAPP, so that the piperazine pyrophosphate provided by the invention also has excellent thermal stability and final char forming performance, and is beneficial to reducing the dosage of the piperazine pyrophosphate in a flame-retardant high polymer material.

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 relates to a phosphoric acid pyrophosphate composite polyanionic positive electrode material for a sodium-ion battery, a preparation method and application of the positive electrode material in the sodium-ion battery. The pyrophosphate composite polyanionic positive electrode has a structure as shown in a formula I: Na4Fe3-x-1. 5y-zMnxVyAz (PO4) 2P2O7 (at) C; when the pyrophosphate composite polyanionic positive electrode has the structure as shown in the formula I, x is more than 1.5 and less than 2.8; and 2) A is selected from one or two of Mg < 2 + >, Al < 3 + >, Cr < 3 + >, Ga < 3 + >, Co < 2 + >, Ni < 2 + >, Cu < 2 + >, Zn < 2 + >, Ge < 2 + >, Zr < 4 + >, Nb < 3 + / 4 + >, Mo < 3 + >, In < 3 + >, Sn < 4 + >, Sb < 3 + >, Te < 4 + >, Ce < 4 + >, Pr < 4 + >, Nd < 3 + >, Pm < 3 + >, Ta < 3 + / 4 + >, W < 4 + >, Bi < 5 + >, Po6 < + >, Cm < 4 + > and Bk < 4 + >. The ionic conductivity and the electronic conductivity of the material are improved through unit cell structure regulation and

The invention belongs to the technical field of sodium ion batteries, and particularly relates to a sodium ferric pyrophosphate positive electrode material as well as a preparation method and application thereof. The invention provides a preparation method of a sodium ferric pyrophosphate positive electrode material, which comprises the following steps: (1) mixing an iron source, a sodium source, a phosphorus source and citric acid for the first time, and performing spray drying for the first time to prepare a first precursor with D50 of 10-12 [mu] m; performing secondary mixing on an iron source, a sodium source, a phosphorus source and citric acid, and performing secondary spray drying to prepare a second precursor with D50 of 3-5 microns; the iron source comprises a first iron source with D50 of 1.1-1.8 [mu] m and a second iron source with D50 of 0.3-0.8 [mu] m; the mass ratio of the first iron source to the second iron source is (0.3-0.5): (0.5-0.7); and (2) mixing the first precursor, the second precursor and sodium metaborate, and sintering to obtain the sodium ferric pyrophosphate positive electrode material. After the prepared pyrophosphate ferric phosphate sodium positive electrode material is prepared into a pole piece, the compaction density is proper, and the prepared battery is high in specific capacity and cycle performance.

The invention discloses a method for synthesizing ferric phosphate pyrophosphate and preparing a sodium ferric phosphate pyrophosphate positive electrode material. The method comprises the following steps: S1, preparing a raw material solution; s2, adding the ferric salt solution, the phosphate radical solution and the pyrophosphate radical solution into the reaction base solution, controlling the pH value, and carrying out coprecipitation reaction; s3, filtering and washing, adding water, and pulping again; s4, heating and crystallizing; s5, filtering and drying; s6, sintering to obtain ferric pyrophosphate Fe6 (PO4) 2 (P2O7) 3; s7, adding ferric pyrophosphate, a sodium source and a carbon source into water, pulping, and sanding; s8, spray drying; and S9, sintering is carried out, such that Na4Fe3 (PO4) 2 (P2O7) / C is obtained. According to the method, a precursor Fe6 (PO4) 2 (P2O7) 3 is synthesized firstly, long-range ordered mixing of Fe and P elements on the atomic scale is achieved, the morphology and particle size of the precursor are controllable, the problem of generation of inactive impure-phase NaFePO4 in the synthesis process of ferric sodium pyrophosphate can be effectively solved, the raw material utilization rate is high, and the synthesized positive electrode material is large in tap density and compaction density and excellent in electrochemical performance.

The invention relates to the technical field of batteries, and discloses a high-compaction ferric sodium pyrophosphate positive electrode material and a preparation method thereof.The chemical formula of the positive electrode material is Na4Fe2.9VxTiyZrz (PO4) 2P2O7, 0.001 < = x < = 0.01, 0.002 < = y < = 0.01, and 0.001 < = z < = 0.01. The preparation method comprises the following steps that a sodium source, an iron source, a phosphorus source, a carbon source, a vanadium source, a titanium source and a zirconium source are weighed and mixed to be uniform, and a mixture is obtained; carrying out primary sanding treatment to obtain first sanding slurry, carrying out spray drying, and carrying out primary sintering treatment to obtain a pre-sintered material; adding a proper amount of carbon source into the pre-sintered material, and carrying out secondary sanding treatment to obtain a second ground material; and carrying out spray drying on the second grinding material, and carrying out secondary sintering treatment to obtain the positive electrode material. The high-compaction ferric sodium pyrophosphate positive electrode material provided by the invention has high compaction density and excellent rate capability and cycle performance, and can be used for preparing a sodium ion battery with high compaction density, high capacity and good rate capability and cycle performance.

The invention provides a positive electrode material and a preparation method thereof, a positive electrode plate, a battery and an electric device. The preparation method of the positive electrode material comprises the following steps: preparing a layered oxide internal core material, wherein the layered oxide internal core material is a layered oxide containing sodium and transition metal; preparing a polyanion external coating material, wherein the polyanion external coating material comprises sodium ferromanganese pyrophosphate; and fusing the layered oxide internal core material and the polyanion external coating material in a mechanical fusion manner to obtain the positive electrode material with the layered oxide and polyanion compounded core-shell structure. The positive electrode material comprises a layered oxide internal core material and a polyanion external coating material; the core material in the layered oxide comprises Na1 + xMO2, X is more than or equal to-0.3 and less than or equal to 0.2, and M comprises at least one of Fe, Ni, Cu, Zn, Co, Ti and Mn; and the external coating material of the polyanion system comprises Na < 4 > Fe < 3-y > Mn < y > (PO4) < 2 > P < 2 > O < 7 > / C.

The invention discloses ferric sodium pyrophosphate, a preparation method, a positive pole piece and a sodium ion battery, and belongs to the technical field of secondary batteries. The preparation method comprises the following steps: S1, mixing a phosphorus element, an iron element, a sodium element and a carbon element in a phosphorus source, an iron source, a sodium source and a carbon source according to a molar ratio of (1-5): (1-3): (1-5): (0.1-0.5); adding a dispersing agent and an organic solvent; s2, carrying out ball milling on the mixture obtained in the step S1; s3, carrying out vacuum drying on the mixture subjected to ball milling; and S4, sintering the material treated in the step S3 to obtain the ferric sodium pyrophosphate. The preparation method of the ferric sodium pyrophosphate comprises the following steps: uniformly mixing a phosphorus source, an iron source, a sodium source and a carbon source through ball milling, and sintering to obtain the ferric sodium pyrophosphate. The ferric sodium pyrophosphate is prepared by adopting a solid phase method, the preparation steps are simple, and large-scale production is easier.

The invention discloses a battery-grade doped modified manganese ferric sodium pyrophosphate positive electrode material as well as a preparation method and application thereof, and belongs to the field of battery materials. An ammonium manganese ferric phosphate precursor is prepared on the basis of an iron process and an ion exchange method, and is prepared into secondarily coated nitrogen-doped carbon-coated sodium manganese ferric phosphate pyrophosphate. According to the method, the content of sulfur impurities in the precursor can be controlled by adopting an ion exchange method, and a secondary sulfur removal process is avoided, so that the content (less than or equal to 100ppm) of the sulfur impurities in the modified manganese ferric ammonium phosphate reaches a battery level, and the cycle performance of the sodium ion battery is improved. The doped metal elements are uniformly distributed in the crystal lattice of the precursor in an atomic scale, so that the internal crystal electronic structure of the manganese ferric sodium phosphate pyrophosphate is effectively regulated and controlled, the structural stability of the manganese ferric sodium phosphate pyrophosphate is improved, meanwhile, the volume expansion effect of sodium ions in the embedding / removing process is relieved, and the electrochemical performance of the positive electrode material is further improved.

The invention relates to the technical production field of metabolic engineering and genetic engineering, and particularly provides a uracil production strain as well as a construction method and application thereof. According to the strain, a uridine kinase gene udk is knocked out on an E.coli W3110 genome, and meanwhile, a T7RNA polymerase gene is integrated; the uridine monophosphate kinase gene pyrH is weakened; the method comprises the following steps: overexpressing a carbamyl phosphate synthetase gene carAB, a ribose phosphate pyrophosphate kinase gene prsA, a pyrimidine-5 '-nucleoside enzyme gene ppnN, UMP phosphohydrolase genes umpH and umpG, a ribonucleoside hydrolase 1 gene rihA and a glutamine synthetase gene glnA; an orotic acid nucleoside monophosphate decarboxylase gene pyrF and an orotic acid ribosyltransferase gene pyrE of wild type bacillus subtilis B.subtilis 168 are introduced in a heterologous manner, so that an orotate nucleoside monophosphate decarboxylase gene pyrF and an orotate ribosyltransferase gene pyrE are obtained. The safe, efficient and low-cost production of the uracil is realized.

The invention discloses application of iron ruthenium nano-enzyme in preparation of nucleic acid detection products, and belongs to the technical field of biological detection and nano-materials. The RIN has stable peroxidase-like (POD) activity, and can catalyze a chromogenic reaction between 3, 3 ', 5, 5'-tetramethyl benzidine (TMB) and hydrogen peroxide (H2O2). The catalytic activity of the nano-enzyme can be selectively inhibited by pyrophosphate (PPi) generated in a nucleic acid amplification reaction, so that visual colorimetric analysis on whether target nucleic acid exists or not is realized. In combination with a polymerase chain reaction (PCR) system, the invention constructs a new nucleic acid detection strategy which does not need fluorescence labeling, is simple and convenient to operate and has high sensitivity. Through verification, the system can be widely applied to rapid on-site screening and visual interpretation of related nucleic acid of drug-resistant pathogens (such as ESKAPE flora) and the like, and has a good application prospect.

The invention belongs to the field of battery materials, and discloses a PEO-based composite solid electrolyte and a preparation method and application thereof, the PEO-based composite solid electrolyte comprises double transition metal-based pyrophosphate, PEO and an electrolyte lithium salt; wherein the molecular formula of the double transition metal-based pyrophosphate is MaNb (P2O7) c, M is any one or two of Fe and V, N is any one or two of Pb and Cd, a is greater than or equal to 1 and less than or equal to 2, b is greater than or equal to 1 and less than or equal to 5, and c is greater than or equal to 1 and less than or equal to 4. By applying the double-transition-metal-based pyrophosphate to the solid electrolyte, the suitability of the solid electrolyte and a positive electrode material with the charging cut-off voltage of 4V or above is improved, and the application range of the solid electrolyte in a battery system with high energy density and long cycle life and a functional energy storage device is widened; and the electrochemical capacity, the structural stability and the ionic conductivity of the battery can be improved.

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 invention provides a ferric sodium pyrophosphate positive electrode material as well as a preparation method and application thereof. The D50 of the sodium ferric phosphate pyrophosphate positive electrode material is 2-10 [mu] m, and the maximum particle size of the sodium ferric phosphate pyrophosphate positive electrode material is less than 25 [mu] m; the internal porosity of the ferric sodium pyrophosphate positive electrode material is less than 14%, and the compaction density is greater than 2.17 g / cm < 3 >. According to the invention, the compaction density of the ferric sodium pyrophosphate positive electrode material can be improved.