185 results about "Titanium phosphate" patented technology

The invention relates to the technical field of chemical degradation of waste polyester, and discloses a titanium-rare earth compound catalyst which comprises a titanium-containing compound and a rare earth catalyst, wherein the titanium-containing compound is selected from at least one of dihydric alcohol modified alkyl titanate, alkyl titanate, dihydric alcohol titanium, titanium phosphate and organic-inorganic hybrid titanium; wherein the rare earth catalyst is selected from acetylacetone rare earth catalysts. The titanium-rare earth compound catalyst has the characteristics of high PET depolymerization rate, low polymerization degree in a depolymerization product, small catalyst dosage, high catalyst selectivity and high yield and purity of a depolymerization product bis (2-hydroxyethyl) terephthalate (BHET) in a degradation reaction of polyethylene glycol terephthalate (PET). The BHET obtained by the method disclosed by the invention can be directly used for preparing PET polyester products or other high-added-value products, and closed-loop cyclic utilization of PET is realized.

The invention discloses a preparation method of a nanoscale lithium aluminum titanium phosphate solid electrolyte, which comprises the following steps: mixing a phosphorus source and a titanium source by using a liquid phase method to react, obtaining a precursor 1 after the reaction is completed under the conditions that the reaction temperature is 25-180 DEG C and the pH value of a reaction system is 0-2, then adding a lithium source and an aluminum source, and preparing a precursor 2 by using a liquid phase reaction, and finally, washing and drying, and carrying out heat treatment to prepare the nano-scale lithium aluminum titanium phosphate solid electrolyte. According to the method, the reaction temperature and the pH value of a reaction system in the process of preparing the precursor 1 are controlled, so that the particle size level of the product is controlled, the introduction of a rear-end crushing process is avoided, the technological process is shortened, and the production period is shortened.

The invention discloses a titanium lithium aluminum phosphate solid electrolyte polymer interface modification method and a preparation method thereof. The method comprises the following steps: firstly, selecting LITFSI (lithium ion conductor), PVDF-HFP (polyvinylidene fluoride-hexafluoropropylene) and DMSO (dimethyl sulfoxide) liquid, and mixing to form PVDF-HFP-based polymer mixed liquid; then, the PAN film doped with titanium lithium aluminum phosphate powder is uniformly coated with the mixed solution through a press coating method, and the PVDF-HFPPAN film is obtained through drying treatment. And cutting the membrane, placing the cut membrane on two sides of a ceramic chip solid electrolyte, assembling an all-solid-state battery, activating at 40-80 DEG C until the polymer is attached to a metal lithium negative electrode and the surface of the solid electrolyte in a gel state, and cooling to finally obtain the solid electrolyte with a PVDF-HFPPAN coated LATP coated PVDF-HFPPAN sandwich structure. The modified solid-state electrolyte membrane can effectively inhibit the interface reaction of LATP on the lithium negative electrode side and enhance the wettability of the positive and negative electrode interface, thereby meeting the cycle performance requirement of the solid-state battery under the normal temperature condition.

The invention discloses a modified current collector and a preparation method thereof, a positive plate and a negative-electrode-free sodium ion battery, and relates to the technical field of sodium ion batteries. The aluminum oxide and the solid electrolyte sodium titanium aluminum phosphate grow on the aluminum metal three-dimensional substrate in situ, so that a higher ion conduction rate can be provided, the injection amount of the electrolyte can be reduced, the growth of dendritic crystals can be reduced, and the safety performance of the battery can be improved. The solid electrolyte (sodium aluminum titanium phosphate) and the artificial SEI film (sodium carbonate / sodium fluoride) are formed on the surface of the three-dimensional current collector, so that the deposition of sodium metal in a three-dimensional substrate is facilitated, and sodium dendrites can be prevented from growing on the surface of the current collector so as to prevent the diaphragm from being punctured. The solid electrolyte, the artificial SEI membrane and the cathode-free metal battery are used together, so that the effects of reducing the cost, prolonging the cycle life and improving the battery capacity density and safety are achieved.

The invention discloses a modification method of a lithium iron phosphate positive electrode material, which comprises the following steps: (1) mixing lithium iron phosphate with a mixed solution of isopropanol and deionized water, and stirring to obtain a solution I; (2) dissolving a lithium-containing compound, a titanium-containing compound and a phosphorus-containing compound in isopropanol to obtain a solution II; (3) slowly dropwise adding the solution II into the solution I, continuously stirring for 3 hours, and then carrying out spray drying to obtain powder; and (4) finally, carrying out heat treatment on the powder material to obtain the lithium iron phosphate coated with lithium titanium phosphate on the surface. According to the invention, the surface of the lithium iron phosphate is coated with a layer of lithium titanium phosphate through a wet coating method, so that the contradiction problem between the compaction density and the electric capacity exertion of the lithium iron phosphate is solved, the compaction density of the lithium iron phosphate is not influenced, the electric capacity exertion is remarkably improved, and the comprehensive performance of the lithium iron phosphate is improved.

The invention provides a method for recovering valuable metals from sulfuric acid process titanium white waste acid through steel slag treatment. The method comprises the following steps: recovering to obtain ferrous sulfate heptahydrate crystals; s2, recovering Sc metal, and extracting the filtrate in the step S1 to obtain a first loaded organic phase and a first raffinate; the first loaded organic phase is washed with alkali liquor, and a second loaded organic phase and washing water are obtained through reverse extraction; treating the washing water to obtain titanium phosphate; back-extracting the second loaded organic phase by using alkali liquor, carrying out filter pressing to obtain crude Sc (OH) 3, and refining to obtain scandium oxide; extracting the first raffinate to obtain a third loaded organic phase and a second raffinate, pickling the third loaded organic phase, reversely extracting with ammonia water, adding phosphoric acid for reaction, and treating to obtain titanium phosphate; and steel slag is added into the second raffinate for neutralization leaching and hydrolysis vanadium precipitation, vanadium-rich slag is obtained through filtering, and then the vanadium electrolyte is prepared. According to the method, iron is separated through crystallization, scandium and titanium are separated through extraction, vanadium-rich slag is separated through neutralization and precipitation, and efficient utilization of resources is achieved.

According to one embodiment of the present invention, a lithium secondary battery is provided, the battery comprising: a cathode including a cathode current collector, and a cathode active material layer formed on one surface or both surfaces of the cathode current collector; an anode including an anode current collector, and an anode active material layer formed on one surface or both surfaces of the anode current collector; and a separator including a substrate, and an oxide-based solid electrolyte layer which is formed on one surface or both surfaces of the substrate and which includes lithium aluminum titanium phosphate (LATP), wherein the anode active material layer and the oxide-based solid electrolyte coating layer face each other, an inorganic layer including a reduced product of the LATP and an SEI material is formed at the interface between the oxide-based solid electrolyte layer and the anode active material layer, and the amount of F in the inorganic layer is 7-15 atom% on the basis of the total amount of atoms present in the inorganic layer.

The invention discloses a lithium aluminum titanium phosphate composite polymer as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The preparation method of the titanium-aluminum-lithium phosphate composite polymer comprises the following steps: dissolving a polymer monomer and a lithium salt in an organic solvent in an inert atmosphere, then adding silane coupling agent modified titanium-aluminum-lithium phosphate, reacting, and then adding a cross-linking agent to carry out cross-linking polymerization on the polymer monomer and the silane coupling agent modified titanium-aluminum-lithium phosphate to obtain the titanium-aluminum-lithium phosphate composite polymer. And curing to obtain the lithium titanium aluminum phosphate composite polymer. Reaction sites dispersed in a polymer chain react with surface groups of the silane coupling agent modified LATP, so that the modified LATP particles are uniformly dispersed along the polymer chain. The LATP and the polymer are connected through a chemical bond, so that discontinuous conduction of lithium ions caused by an organic-inorganic interface of a traditional composite electrolyte is improved. The introduction of LATP makes the electrolyte have good mechanical properties and thermal stability.

The invention discloses a method for recovering scandium and titanium from Bayer process red mud. The method comprises the following steps: (1) drying the red mud; (2) mixing the dried red mud and phosphoric acid, performing acid leaching reaction, and then filtering and drying to obtain pretreated red mud; (3) carrying out acid leaching on the pretreated red mud by adopting a phosphoric acid-hydrogen peroxide system, and carrying out solid-liquid separation to obtain red mud leachate containing scandium and titanium and iron-rich leaching residues; (4) mixing the red mud lixivium containing scandium and titanium with a P204 extracting agent, stirring, oscillating and carrying out oil-water separation to obtain a scandium-loaded organic phase and a titanium-containing lixivium, and carrying out acid pickling on the organic phase for multiple times; and (5) adding ammonia water into the titanium leachate to adjust the pH value, heating and stirring, standing and precipitating to obtain amorphous titanium phosphate, and carrying out acid pickling after solid-liquid separation. According to the method, scandium and titanium in the red mud are separated and recycled in a two-stage acid leaching-extraction-precipitation combined mode. The selectivity of scandium and titanium is improved. And technical support is provided for recovery of scandium and titanium and comprehensive utilization of red mud.

The invention belongs to the technical field of energy storage batteries and electrochemistry, and discloses a green preparation method and application of a carbon-coated sodium titanium phosphate composite material, titanyl sulfate and sodium dihydrogen phosphate are only used as raw materials, a simple coprecipitation method is used for preparing a precursor, the precursor and sodium dihydrogen phosphate are mixed and roasted, and sodium titanium phosphate can be obtained. Hydrothermal treatment is not needed, and harsh preparation conditions of high temperature and high pressure are avoided; meanwhile, ammonia-containing substances and acid do not need to be used, so that the ammonia-containing substances and the acid are prevented from being transported, stored, used, discharged and treated; the used raw materials are all solid materials and are not easy to volatilize or leak, so that the safety risk and loss in the transportation process are reduced. The titanyl sulfate used in the invention belongs to an intermediate for preparing titanium dioxide, is rich in source and low in price, and is suitable for industrial preparation. The carbon-coated sodium titanium phosphate prepared by the invention is used as a negative electrode of a sodium-ion battery, and has the material characteristic of high phase purity and the electrochemical characteristics of excellent specific capacity, rate, long cycle and the like.

The invention discloses a high-temperature-resistant polyurethane elastomer and a preparation method thereof, and relates to the technical field of polymer materials, the high-temperature-resistant polyurethane elastomer comprises the following specific components: polyether polyol, poly (toluene diisocynate) pMD I, a chain extender and a cross-linking agent; the high-temperature-resistant polyurethane elastomer further comprises additives, wherein the additives specifically comprise nano aluminum silicate fibers, a titanium phosphate-based temperature-resistant synergist, a multi-walled carbon nanotube grafted amide group and a metal organic framework composite material. According to the high-temperature-resistant polyurethane elastomer and the preparation method thereof, multiple additives and nano aluminum silicate fibers are introduced into the polyurethane elastomer, so that the thermal isolation property of the material is effectively improved; the multi-walled carbon nanotube grafted amide group improves the thermal conductivity, and solves the problem of poor dispersibility of the carbon nanotube in a polyurethane matrix; the thermal stability of the material is further improved by the titanium phosphate-based temperature-resistant synergist; the introduction of the metal organic framework composite material significantly improves the gas isolation and thermal stability of the material.

The invention discloses an anti-alkali metal poisoning SCR (Selective Catalytic Reduction) catalyst and a preparation method and application thereof, and belongs to the field of catalysts for atmospheric governance, the SCR catalyst comprises the following components in percentage by mass: 80%-90% of TiO2, 0.5%-1.5% of V2O5, 3%-5% of WO3 and 3%-10% of a cocatalyst; the cocatalyst comprises one or two of zirconium phosphate and titanium phosphate. The SCR catalyst provided by the invention is high in targeting property and remarkable in alkali metal poisoning resisting effect. TiO2 is used as a main carrier, V2O5 provides a main catalyst active component, WO3 can improve the thermal stability and acidity of the catalyst, a cocatalyst loses activity after capturing alkali metal, and an effective chemical barrier is constructed by sacrificing the cocatalyst; the path that alkali metal ions continue to diffuse into the coating and react with key V-OH acidic sites is blocked, and the alkali poisoning resistance is qualitatively improved, so that the denitration activity of the catalyst is preserved.

The invention relates to the field of lithium ion battery positive electrode materials, and discloses a lithium iron phosphate positive electrode material and a preparation method and application thereof. The positive electrode material comprises a matrix and a carbon coating layer coating the surface of the matrix, and based on the total weight of the positive electrode material, the content of the matrix is 94.5-98.9 wt%, and the content of the carbon coating layer is 1.1-5.5 wt%; wherein the matrix is composed of lithium iron titanium phosphate and lithium iron titanium phosphate; the phase composition of the positive electrode material is xLiFe (1-a) TiaPO4. (1-x) LiTi (2-b) Feb (PO4) 3 (at) C, wherein a is more than 0.01 and less than 0.03, b is more than 0.1 and less than 0.3, and x is more than 0.94 and less than 1. The lithium iron phosphate positive electrode material provided by the invention has excellent rate capability, and effectively solves the problem of low energy efficiency of lithium iron phosphate in the prior art.

The method for controlling titanium doping in the iron phosphate synthesis process comprises the following steps that S1, a phosphorus source, an iron source, a titanium source and water are mixed and dissolved, and molten metal is prepared; s2, respectively preparing titanium phosphate seed crystal slurry and iron phosphate seed crystal slurry; s3, the iron phosphate seed crystal slurry and the titanium phosphate seed crystal slurry are added into the molten metal for a heating reaction, and titanium-doped iron phosphate slurry is obtained; in the molten metal, the concentration of the iron element is 60-70 g / L, the molar ratio of the iron element to the phosphorus element is (0.98-1): 1, and the mass ratio of the iron element to the titanium element is (95-100): 1. By controlling the concentration of Fe and Ti in molten metal and adding seed crystals, the precipitation rate of Fe and Ti in the synthesis process is regulated and controlled, so that titanium doping is accurately realized, and iron phosphate products with multiple series of titanium contents can be synthesized.

The invention discloses a multi-layer continuously coated mixed electrode material sodium-ion battery and a preparation method thereof, a positive electrode adopts a layered oxide material continuously coated by multi-layer carbon-phosphoric acid ferric sodium pyrophosphate, a carbon-based dispersant adopted in the coating process has the effect of dispersing slurry and also has the effect of coating a carbon source, and wet-process mixed coating is adopted, so that the coating efficiency is greatly improved, and the service life of the battery is prolonged. And the continuity and the uniformity of the coating layer are ensured. The negative electrode adopts a carbon-coated sodium titanium phosphate material, a carbon-based dispersant is still adopted as a carbon source in the coating process, and a secondary sintering method is adopted, so that the obtained negative electrode material is purer in phase, more stable in structure and better in carbon coating effect. And finally, the prepared positive electrode material, the prepared negative electrode material and a non-aqueous electrolyte are assembled into a battery for testing, and a test result shows that the specific capacity of the battery adopting the layered oxide material continuously coated with the multi-layer carbon-phosphoric acid ferric sodium pyrophosphate as the positive electrode is not influenced, and the cycle performance is better.

The present invention discloses a method for synthesizing a solid electrolyte material. The method comprises: low-temperature oxidation of a LATP precursor; short-term high-temperature sintering of the precursor in a protective atmosphere; low-temperature oxidation removal; and dynamic high-temperature sintering for carbon removal. The solid electrolyte nano-lithium aluminum titanium phosphate (LATP) material produced by the present method exhibits high ionic conductivity. Lithium-ion batteries prepared from this material exhibit low low-temperature DCR, high capacity utilization, and excellent cycling performance.

The invention relates to the technical field of metal cutting fluid, in particular to nano-based metal cutting fluid and a preparation method thereof. The nano-based metal cutting fluid is prepared from the following raw materials in parts by mass: 50-60 parts of base oil, 2-5 parts of modified nano titanium phosphate, 1-2 parts of modified nano silicon nitride, 2-3 parts of a defoaming agent and 10-20 parts of water. The cutting fluid prepared by the invention can be more easily and stably adsorbed on a metal surface to form a protective layer, has good thermal conductivity, lubricity and antibacterial property, prevents serious abrasion and adhesion phenomena in a cutting process, prevents deterioration and stinking of the cutting fluid, prolongs the service life of a cutter and a workpiece, and has a good application prospect. The use and storage stability of the cutting fluid is improved.

The invention provides an asymmetric solid electrolyte membrane and a preparation method thereof and application of the asymmetric solid electrolyte membrane in a battery, the asymmetric solid electrolyte membrane comprises a base membrane, a first coating and a second coating, the base membrane is provided with a first surface and a second surface, the second surface is opposite to the first surface, and the second surface is opposite to the first surface. The first coating is formed on the first surface of the base film and contains lithium titanium aluminum phosphate, and the second coating is formed on the second surface of the base film and contains a solid electrolyte material except the lithium titanium aluminum phosphate. In the invention, the solid electrolyte which is stable to the negative electrode is selected for coating, so that the problem that the performance of the negative electrode is degraded by LATP is solved, the overall performance of the diaphragm is improved, and the coating process is adaptive to an existing production line and does not need to be greatly modified.

The invention discloses a preparation method of a sodium manganese titanium phosphate positive electrode material for a sodium-ion battery and a vehicle, belongs to the technical field of synthesis of the sodium-ion battery positive electrode material, and particularly relates to the preparation method of the sodium manganese titanium phosphate positive electrode material for the sodium-ion battery. The preparation method comprises the following steps: mixing a sodium source, a phosphorus source, a carbon source, a titanium source, a manganese source and a high-entropy metal source, then adding a slurry binder, stirring and dispersing at a high speed, and carrying out sanding treatment, spray drying and high-temperature calcination to prepare the sodium titanium manganese phosphate positive electrode material for the sodium-ion battery. The slurry binder at least comprises a polyarylene ether nitrile derivative, and the polyarylene ether nitrile derivative has a sulfur element and a cyano group. The invention provides the preparation method of the sodium manganese titanium phosphate positive electrode material for the sodium-ion battery, which is high in first cycle reversible capacity, low in resistivity, long in cycle life and excellent in rate capability, and the prepared sodium manganese titanium phosphate positive electrode material for the sodium-ion battery is applied to preparation of vehicles.

The invention relates to a diaphragm, a preparation method thereof, a secondary battery and a device. The diaphragm provided by the invention comprises a diaphragm body; the solid electrolyte layer is arranged on the diaphragm body, the solid electrolyte layer comprises a modified metal oxide, the modified metal oxide comprises a metal oxide and a silane compound connected to the surface of the metal oxide, and the silane compound is connected to the surface of the metal oxide. The metal oxide comprises at least one of lithium aluminum titanium phosphate, lithium lanthanum zirconium oxide, lithium lanthanum zirconium tantalum oxide, lithium lanthanum zirconium aluminum oxide, lithium lanthanum titanium oxide, lithium aluminum germanium phosphate and lithium lanthanum aluminum titanate. According to the invention, the hydrophobic modified metal oxide is coated on the diaphragm body and the solid electrolyte layer is formed, so that the moisture value of the solid electrolyte coated diaphragm is remarkably reduced, the negative influence of the moisture of the diaphragm on the battery performance is relieved, and the coulombic efficiency and the cycle performance of the secondary battery using the diaphragm are improved.

The invention relates to the technical field of titanium dioxide production, in particular to a method for recycling titanium in titanium dioxide waste acid. Comprising the following steps: S1, heating the titanium white waste acid, sequentially adding Al (OH) 3 and phosphoric acid in a stirring state, reacting, standing, and removing supernate to obtain a titanium phosphate solid; s2, bleaching and washing the titanium phosphate solid to obtain impurity-removed titanium phosphate; and S3, adding the impurity-removed titanium phosphate into the slurry before sulfuric acid process titanium dioxide salt treatment, and carrying out salt treatment and calcination to obtain a kiln falling product. According to the method, aluminum hydroxide and phosphoric acid are sequentially added into the titanium white waste acid, generated aluminum salt is used as a flocculating agent to condense small titanium phosphate particles, increase the particle size and reduce the viscosity, later filtering and washing are facilitated, titanium phosphate subjected to washing and impurity removal can be directly reused for production, and Ti is effectively recycled; the obtained product is high in whiteness and free of ammonia-nitrogen wastewater, a salt treatment agent does not need to be added in the salt treatment process, and the cost is low.

The invention discloses a preparation method of a self-repairing LATP composite solid electrolyte membrane, which comprises the following steps: S1, hydroxylating titanium aluminum lithium phosphate nanoparticles, and coating with an isocyanate polyurethane prepolymer to obtain porous PU-LATP particles; s2, carrying out copolymerization on adamantanediol diacrylate, acrylate and furfuryl acrylate, and then carrying out a Diels-Alder reaction with bismaleimide so as to form a reversible cross-linked precursor solution; and S3, mixing the PU-LATP particles with the precursor, a lithium salt and an auxiliary agent, carrying out vacuum defoaming, and drying to obtain the self-repairing LATP composite solid electrolyte membrane. According to the preparation method disclosed by the invention, the solid electrolyte membrane is endowed with the capability of quickly self-repairing microcracks at room temperature, and high ionic conductivity and a wide electrochemical window are considered at the same time; the mechanical strength is obviously improved, the thermal dimensional stability is excellent, and the strict requirements of the solid-state lithium battery on high safety and long cycle life can be met.

The invention discloses a preparation method of a lithium aluminum titanium phosphate solid electrolyte nano powder material, which comprises the following steps: S1, weighing a lithium source, an aluminum source, a titanium source and a phosphorus source, and preparing a sol precursor; s2, performing microwave treatment to obtain a gelatinous intermediate; s3, carrying out annealing treatment after grinding to obtain nano titanium aluminum lithium phosphate powder; s4, placing the substrate in a plasma enhanced atomic layer deposition reaction cavity, vacuumizing, and introducing plasma activation gas; alternately pulse trimethylaluminum and titanium tetrachloride precursors, and depositing to obtain a gradient oxide intermediate layer; s5, introducing oxygen plasma to oxidize the residual precursor to form a gradient oxide coating layer; and S6, carrying out annealing treatment to obtain the lithium titanium aluminum phosphate solid electrolyte nano-powder material. According to the preparation method disclosed by the invention, the side reaction of the LATP powder and lithium metal is effectively inhibited, the interface stability and the ionic conductivity are improved, and the high-performance requirement of an all-solid-state lithium ion battery on a solid electrolyte material can be met.

The invention relates to the technical field of positive electrode material precursors, in particular to a method for preparing battery-grade iron phosphate by taking titanium dioxide waste acid as a raw material and application of the battery-grade iron phosphate. Hydrolysis waste acid in the titanium dioxide industry is selected as the raw material, ammonia gas is used as a pH regulator, and phosphorus salt and hydrogen peroxide are used as precipitants; the solubility product constants of aluminum phosphate and titanium phosphate are small, Al < 3 + > and Ti < 4 + > in the hydrolysis waste acid are precipitated by adopting soluble phosphate and then are filtered and removed, iron ammonium phosphate is precipitated by virtue of phosphorus salt and is fully washed, and the content of metal impurity ions can be reduced to be less than 100ppm; according to the method, ferrous sulfate is subjected to fractional precipitation, impurity removal, precipitation, washing and aging under different pH conditions, so that the use amount of alkaline substances is greatly reduced, and the problems of high liquid waste treatment cost and resource waste in the traditional titanium dioxide industry are solved.

The invention belongs to the technical field of batteries, and particularly relates to a lithium titanium aluminum phosphate solid-state electrolyte and a preparation method and application thereof, and the chemical formula of the lithium titanium aluminum phosphate solid-state electrolyte is Li < 1 + x > Al < x > Ti < 2-x-y > M < y > (PO4) 3, the lithium aluminum titanium phosphate solid electrolyte is prepared from the following raw materials: a lithium source, a titanium source, a phosphorus source, an aluminum source, an M source and an auxiliary agent, wherein the auxiliary agent is used for promoting the lithium source, the titanium source and part of the phosphorus source to react to form an intermediate product. As the intermediate phase LiTiOPO4 cooperates with M source doping and substitution, Ti < 4 + > can be inhibited from being reduced into Ti < 3 + >, lattice collapse caused by titanium valence change in electrochemical circulation is avoided, and the ionic conductivity is improved; as the LiTiOPO4 intermediate phase is used for synthesizing the titanium aluminum lithium phosphate, the use amount of single phosphoric acid in the secondary sintering process can be reduced, the high-temperature liquid phase reaction is avoided, and the sintered finished product has the advantages of fluffiness and no sagger bonding; in the synthesis and sintering process of the lithium titanium aluminum phosphate, the LiTiOPO4 intermediate phase tends to form a continuous second phase network at the grain boundary of the LiTiOPO4 intermediate phase, so that the grain boundary impedance of the lithium titanium aluminum phosphate can be reduced.

The present invention discloses a lithium aluminum titanium phosphate composite polymer, a preparation method thereof and an application thereof, belonging to the technical field of lithium ion batteries. The preparation steps of the lithium aluminum titanium phosphate composite polymer include: in an inert atmosphere, dissolving a polymer monomer and a lithium salt in an organic solvent, then adding lithium aluminum titanium phosphate modified by a silane coupling agent, and after the reaction, adding a crosslinking agent to crosslink and polymerize the polymer monomer and the lithium aluminum titanium phosphate modified by the silane coupling agent, and obtaining the lithium aluminum titanium phosphate composite polymer after curing. The present invention utilizes the reactive sites dispersed in the polymer chain to react with the surface groups of the LATP modified by the silane coupling agent, so that the modified LATP particles are uniformly dispersed along the polymer chain. A chemical bond connection is formed between the LATP and the polymer, improving the discontinuous conduction of lithium ions caused by the organic-inorganic interface of the traditional composite electrolyte. The introduction of LATP endows the electrolyte with good mechanical properties and thermal stability.

The invention provides a method for synthesizing a carbon-coated sodium titanium phosphate cathode active material and an aqueous lithium battery cathode material by a solid phase method. The method comprises the following steps: mixing a sodium source, a titanium source and a phosphorus source in an organic solution, drying to obtain precursor powder, and sintering to obtain a carbon-coated sodium titanium phosphate material; and adding a sugar source into the carbon-coated sodium titanium phosphate material, uniformly mixing, calcining to obtain a carbon-coated sodium titanium phosphate negative electrode active material, and mixing the carbon-coated sodium titanium phosphate negative electrode active material with a binder conductive agent to obtain the aqueous lithium battery negative electrode material. According to the preparation method, by controlling the sintering process and designing and optimizing the raw materials, generation of impure phases is inhibited, meanwhile, good carbon coating is achieved, the conductivity of the material is improved, and by introducing the binder with high ionic conductivity, the capacity and the cycle retention rate of the NTP negative electrode are improved.

The invention discloses a high-density solution titanium alloy product screening method, and belongs to the technical field of titanium alloy product screening. The method is based on the density difference sorting principle, batch screening is achieved through two times of screening, in the first time of screening, to-be-screened titanium alloy particles are added into a high-density base solution (composed of phosphoric acid, sodium phosphate and sodium carbonate) with the density being 1.65 g / cm < 3 >, and particles which sink to the bottom and are too large in density are removed; in the second screening, floating or suspending particles in the first screening are added into a solution with the density adjusted to be 1.48 g / cm < 3 >, and the particles which sink to the bottom or suspend are qualified products. The transparent characteristic of the high-density solution is utilized, observation is facilitated, one-by-one operation is not needed, large-scale screening can be achieved, efficiency is improved, labor intensity is reduced, large-scale production is adapted, the residual solution is removed through the stepped cleaning step after screening, a titanium phosphate film formed on the surface of the titanium alloy is protected, and product stability is ensured.

The application discloses a kind of nano tin oxide and lithium titanium aluminum phosphate double-coated high-pressure-resistant lithium cobaltate positive electrode material and preparation method thereof.The positive electrode material is lithium cobaltate as matrix and is coated with ion conductor material lithium titanium aluminum phosphate and nano tin oxide on its surface;Nano tin oxide coating can inhibit the interface side reaction of lithium cobaltate positive electrode and electrolyte, and doped into the lattice vibration of body pegging layered structure, prevent the irreversible phase transition of material;Lithium titanium aluminum phosphate can construct interface with excellent ion and electron conductivity characteristics, further promote the rapid conduction of lithium ion in positive electrode material.Lithium cobaltate positive electrode coated with double coating has double-layer lithium ion conductor coating layer, to a certain extent, play the dual role of physical barrier and chemical stability, meet the high-pressure cycle stability required by lithium cobaltate positive electrode at present.

The invention provides a lithium titanium aluminum phosphate solid electrolyte, a preparation method and application thereof, and a solid-state battery. The preparation method of the lithium aluminum titanium phosphate solid electrolyte comprises the following steps: adding a titanium source into a sulfuric acid solution, realizing stable dispersion of titanyl sulfate through sulfuric acid, and obtaining a dispersed phase solution after the titanyl sulfate is completely and uniformly dissolved; and adding an aluminum source, a lithium source and a phosphorus source into the dispersed phase solution, stirring to gradually remove a part of the solvent, adjusting the concentration to obtain a mixture without flowing liquid, putting the mixture into a muffle furnace, calcining, and grinding to obtain the lithium titanium aluminum phosphate solid electrolyte after calcining. The method has the advantages of a solid phase and a liquid phase, a liquid phase mixing-solid phase sintering method is realized, low-cost raw materials are used, uniform synthesis of a precursor material is realized through a simple liquid phase evaporation technology, and low-cost and high-performance rapid synthesis of the LATP material is finally realized through solid phase sintering.