115 results about "Titanium phosphate" patented technology

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 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 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 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 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.

The application provides a secondary battery and a power consumption device. The secondary battery comprises a positive electrode sheet, a negative electrode sheet and a separator, the separator is located between the positive electrode sheet and the negative electrode sheet, the separator comprises a first polymer layer and a material layer arranged on the first polymer layer, the material layer comprises inorganic material, the inorganic material comprises one or more of lithium aluminum titanium phosphate, lithium aluminum germanium phosphate, lithium aluminum titanium germanium phosphate, lithium aluminum titanium tantalum phosphate, lithium tetra-thiophosphate, lithium germanium phosphorus sulfide, lithium phosphorus sulfide chloride, titanium dioxide, wherein, in a longitudinal section view of the separator, the difference between the porosity of the material layer and the porosity of the first polymer layer is less than or equal to 5%, the porosity of the material layer is 15%-30%, and the porosity of the first polymer layer is 15%-30%; and the thickness of the separator is 10-15 mu m. The secondary battery has excellent high-rate cycle performance, and the battery has a long service life.

This invention discloses a heat treatment method for carbon-coated lithium titanium phosphate anode material, comprising heat treating a precursor of the carbon-coated lithium titanium phosphate anode material. The heat treatment includes the following steps: a first heat treatment at temperature T1 and holding time t1; a second heat treatment at temperature T2 and holding time t2; and a third heat treatment at temperature T3 and holding time t3. The temperature T1 of the first heat treatment is lower than the temperature T2 of the second heat treatment, and the temperature T2 of the second heat treatment is lower than the temperature T3 of the third heat treatment. By adjusting the heat treatment regime, this invention facilitates the timely removal of water molecules released by the thermal decomposition of the raw material components in the precursor, reduces particle agglomeration, improves the uniformity of carbon coating, and controls the grain size and morphology of the coated particles, thereby effectively improving the discharge specific capacity and cycle stability of the battery.

The invention provides an electrode plate and a preparation method and application thereof in low-concentration rare earth ion recovery, and belongs to the technical field of electrochemistry, the electrode plate comprises a conductor layer and an active layer, the active layer comprises a titanium phosphate composite electrode material, a conductive agent and an adhesive, the titanium phosphate composite electrode material comprises inner core particles and a shell layer from inside to outside, the inner core particles are conductive particles, and the shell layer is composed of titanium phosphate nanosheets. The electrode plate active layer adopted by the invention comprises a titanium phosphate composite electrode material, and titanium phosphate adsorbs rare earth ions on the titanium phosphate composite electrode material through chemical complexation; the conductive particles can improve the electrochemical performance of the titanium phosphate, improve the capacitance capacity of the titanium phosphate and reduce the internal resistance, and the titanium phosphate composite electrode material improves the recovery effect of the rare earth ions in the low-concentration rare earth leaching solution through coupling strengthening of the electric field effect.

To provide a titanium phosphate film that exhibits a large specific surface area and high catalytic activity.SOLUTION: A film containing titanium phosphate is configured to have a surface provided with a concavo-convex structure in which nanometer-sized irregularities are repeated.SELECTED DRAWING: Figure 3

The invention specifically discloses a positive plate and a lithium ion battery applying the same. The positive plate comprises a current collector, a bottom coating and a positive active material layer, the bottom coating and the positive active material layer are sequentially arranged on at least one surface of the current collector, and the bottom coating is located between the current collector and the positive active material layer; the bottom coating layer comprises lanthanum fluoride nanoparticles and lithium aluminum titanium phosphate; the positive active material layer includes a ternary active material. The high-temperature-resistant performance of the high-nickel lithium battery can be remarkably improved while the high-nickel lithium battery has the dynamic performance of the high-nickel lithium battery.

Provided is a titanium phosphate coating film having a large specific surface area and high catalytic activity. This coating film, which contains titanium phosphate, is configured so as to have an uneven structure in which nanometer-sized dips and bumps are repeated on a surface.

This invention belongs to the field of all-solid-state lithium metal batteries and discloses a method for preparing a lithium-rich titanium phosphate lithium solid electrolyte and its application. The preparation method of this invention has the advantages of simplicity, energy saving, and suitability for large-scale production. By optimizing precursor preparation and reaction conditions, the synthesis temperature is significantly reduced and the reaction cycle is shortened. The resulting electrolyte material has a pure phase and excellent ionic conductivity, effectively solving the key challenges in the practical preparation of this material. This method is of great value in promoting the industrial application of high-safety, high-energy-density solid-state lithium metal batteries. The solid electrolyte powder prepared by this method is in the form of nanoparticles with a narrow particle size distribution, and exhibits a bulk room-temperature ionic conductivity exceeding [value missing] and a total ionic conductivity exceeding [value missing]. This invention is of great significance for the large-scale production of solid-state electrolytes and the promotion of their application in lithium metal batteries.

The invention relates to a composite diaphragm as well as a preparation method and application thereof, and the composite diaphragm comprises a base diaphragm and a coating layer formed on the surface of one side or two sides of the base diaphragm, the coating layer is prepared from raw material components including a modified nano material and glue solution slurry; wherein the modified nano material is obtained by carrying out hydroxyl modification on lithium titanium aluminum phosphate nano particles. According to the preparation method disclosed by the invention, the characteristic of the lithium aluminum titanium phosphate nanoparticles is changed from water absorption to hydrophobicity through modification, and the liquid retention rate of the composite diaphragm can be improved while the hot shrinkage rate of the composite diaphragm is effectively maintained by using the hydrophobized modified nanomaterial, so that the infiltration rate of an electrolyte within unit time is improved; therefore, the electrical performance of the cell is improved.

This invention provides a lithium cobalt oxide cathode material coated with a lithium aluminum titanium phosphate composite, which has a core-shell structure, comprising a doped lithium cobalt oxide core material inside the core-shell structure and a coating layer formed on the surface of the doped lithium cobalt oxide core material; the chemical formula of the doped lithium cobalt oxide core material is: LiCo 1‑a‑b‑c Mg a Al b Ce c The coating layer comprises lithium aluminum titanium phosphate, cerium titanate, lithium cerium phosphate oxide, and lithium cerium phosphate. This invention's lithium aluminum titanium phosphate composite coating modified lithium cobalt oxide cathode material overcomes the defect of a sharp performance drop under high temperature and high pressure applications when lithium aluminum titanium phosphate is coated alone. The oxygen vacancies and coating structure provided by the composite coating layer of lithium aluminum titanium phosphate, cerium titanate, lithium cerium phosphate oxide, and lithium cerium phosphate enhance the structural continuity between the bulk phase and the coating layer, as well as the conductivity of the fast ion conductor, thereby enabling the material to maintain good cycle retention and capacity characteristics under high temperature and high pressure.

The invention relates to a self-cleaning coating as well as a preparation method and application thereof, and relates to the technical field of coatings, and a self-cleaning functional component of the self-cleaning coating comprises modified titanium dioxide; the modified titanium dioxide is obtained by reacting titanium dioxide with an organic phosphonic acid compound as shown in a formula I. Under an existing self-cleaning coating formula system, titanium dioxide and an acridinyl-containing organic phosphonic acid compound are reacted according to a proper proportion, so that part of titanium dioxide is converted into an organic phosphonic acid titanium compound under the actions of acid-base neutralization, coordination and the like; modified titanium dioxide is endowed with double self-cleaning action mechanisms of a photocatalyst TiO2 and an air catalyst titanium phosphate, so that the self-cleaning effect of the coating is remarkably improved; meanwhile, the modified titanium dioxide can effectively enhance the bonding strength between the coating and the base material and improve the weather resistance of the coating, so that the self-cleaning use requirements of the surfaces of various base materials such as stones, aluminum plates and glass can be met.

The method for manufacturing the solid electrolyte thin film includes mixing a first precursor for synthesizing lithium lanthanum zirconium oxide, a second precursor for synthesizing lithium aluminum titanium phosphate or a third precursor for synthesizing lithium lanthanum titanium oxide, a polar solvent and a metal oxide containing a doping element to form a mixture. The first precursor includes a lithium source, a lanthanum source and a zirconium source, the second precursor includes a lithium source, an aluminum source, a titanium source and a phosphate, and the third precursor includes a lithium source, a lanthanum source and a titanium source. The mixture is ground to form a powder mixture. The powder mixture is calcined to form a doped powder. The doped powder, a lithium salt and a conductive polymer are mixed to form a slurry. A wet thin film is formed from the slurry. The wet thin film is baked. The solid electrolyte thin film can effectively reduce the interface impedance between the electrolyte and the positive and negative electrodes, and can have better charge and discharge performance when applied to a battery.

The invention discloses a lithium aluminum titanium phosphate solid electrolyte and a preparation method of the lithium aluminum titanium phosphate solid electrolyte with low wall adhesion rate. Weighing a lithium source, an aluminum source, a titanium source and a phosphorus source, adding an ethanol solvent, and treating by adopting a sand mill to obtain a mixed raw material; drying the mixed raw material by using a vacuum drying oven to obtain a powder precursor; and putting the precursor into a special mold with a double-layer structure and a gradient composite coating on the surface, and performing low-wall-adhesion sintering at 800-1200 DEG C in an air atmosphere to obtain the pure-phase lithium aluminum titanium phosphate solid electrolyte. The surface of the grinding tool is sequentially coated with a bottom porous Al2O3 layer and a surface graphene composite coating through a plasma spraying and chemical vapor deposition method. The bottom porous Al2O3 layer realizes mechanical anchoring and thermal expansion matching, so that layer cracking is avoided; the surface nano graphene layer provides a super-lubricating interface and a Li < + > diffusion barrier, physical-chemical synergistic anti-sticking is realized, the problem that a product is difficult to take out due to wall sticking in the sintering process is greatly improved, and the wall sticking rate is reduced.

This invention discloses a method for preparing and applying boron ion-doped modified titanium manganese phosphate, belonging to the field of sodium-ion battery cathode material preparation technology. The method includes the following steps: dissolving a carbon source, a sodium source, and a manganese source in an ethanol solution and stirring to obtain a mixture A; dissolving a titanium source in an ethanol solution and stirring to obtain a mixture B; dissolving a phosphorus source and a boron source in a deionized aqueous solution and stirring to obtain a mixture C; slowly adding mixtures B and C sequentially to mixture A and stirring to obtain a mixture D; subjecting mixture D to oil bath heating, drying, and calcination treatment sequentially to obtain boron ion-doped modified titanium manganese phosphate. This invention prepares a boron ion-doped modified titanium manganese phosphate and applies it to sodium-ion battery cathode materials. By doping boron ions into titanium manganese phosphate, a boron ion-doped modified titanium manganese phosphate cathode material with excellent electrochemical performance is prepared.

The present invention discloses a high-conductivity composite coating diaphragm, its preparation method, and application. The high-conductivity composite coating diaphragm comprises: a base film and a coating coated on the base film. The coating comprises: poly(p-phenylene terephthalamide), lithium aluminum titanium phosphate, aluminum nitride, and a first substance, the first substance being one or a mixture of lithium nitrate, sodium dodecylbenzenesulfonate, an organic nitrate, and isosorbide dinitrate. The present invention improves the transport of lithium ions in the coating diaphragm by introducing aluminum nitride, thereby improving the ionic conductivity of the coating diaphragm. The introduction of PPTA further enhances the heat resistance and adhesion of the coating diaphragm. The introduction of LATP provides the coating diaphragm with good porosity, thermal stability, and liquid absorption rate. The first substance is introduced as a dispersant for LATP, improving its dispersibility. Furthermore, the inclusion of lithium in the first substance replenishes lithium in the diaphragm, synergizing with aluminum nitride to enhance the ionic conductivity of the diaphragm.

The invention relates to the technical field of sodium ion batteries, in particular to a modified layered transition metal oxide material and a preparation method and application thereof. The modified layered transition metal oxide material comprises a doped and modified layered transition metal oxide core and a coating layer coating the surface of the core, the core of the doped and modified layered transition metal oxide is Na < x > Ni Mn M < c > O < 2 >, xlt; 1, 0lt; a < lt >; 0.33, 0 lt; blt; 0.67, a + b + c = 1; m is selected from at least three of Ti < 4 + >, Zn < 2 + >, Mg < 2 + >, Cu < 2 + >, W < 5 + >, Mo < 4 + >, Sn < 4 + >, Sb < 5 + >, Zr < 4 + >, Al < 3 + >, Fe < 3 + >, Ca < 2 + >, V < 3 + >, Y < 3 + > or Ce < 4 + > ions; and the coating layer comprises the following components: carbon and sodium titanium phosphate. The modified layered transition metal oxide material provided by the invention has excellent stability and cycle performance.

The application discloses a titanium-site copper-doped high-performance sodium-ion battery positive electrode material of sodium titanium manganese phosphate and a preparation method and application thereof, and belongs to the technical field of sodium-ion batteries. The titanium-site copper-doped sodium-ion battery positive electrode material of sodium titanium manganese phosphate is obtained by doping copper at the titanium site of sodium titanium manganese phosphate; the general formula of the titanium-site copper-doped sodium-ion battery positive electrode material of sodium titanium manganese phosphate is Na 3+ 2x MnTi 1‑x Cu x (PO4)3, wherein 0 < x <= 0.2. The preparation method of the titanium-site copper-doped sodium-ion battery positive electrode material of sodium titanium manganese phosphate comprises the following steps: raw materials including a titanium source, a manganese source, a sodium source, a phosphorus source and a copper source are prepared into a precursor powder through a spray drying method or a ball milling method; and the precursor powder is calcined under an inert atmosphere to obtain the titanium-site copper-doped sodium-ion battery positive electrode material of sodium titanium manganese phosphate. The obtained positive electrode material has small polarization, reverse-site defects are effectively inhibited, reversible capacity is obviously improved, and rate performance is obviously improved.

The invention discloses a preparation method of lithium titanium aluminum phosphate solid electrolyte powder, the chemical formula is Li1 + xAlxTi2-x (PO4) 3, x is more than or equal to 0.3 and less than or equal to 0.5, and a lithium source, an aluminum source, titanium dioxide and a phosphorus source are weighed according to the molar ratio of (1 + x): x: (2-x): (3-3.3); the preparation method comprises the following steps: dissolving a lithium source, an aluminum source and a phosphorus source in deionized water, and adding sulfuric acid with the molar concentration of 0.01-0.02 mol / L to adjust the pH value to 2-4 so as to form a precursor mixed solution; titanium dioxide powder and an organic solvent are added into the hydrothermal reaction kettle, the volume ratio of the organic solvent to the deionized water is 1: 1-1: 3, and continuous stirring is conducted; adding the precursor mixed solution into a reaction kettle, carrying out hydrothermal reaction in a range of 190-230 DEG C, carrying out suction filtration and washing, and then drying in an environment of 80-120 DEG C to obtain powder; and roasting at 600-725 DEG C to obtain the final lithium titanium aluminum phosphate powder. A lithium titanium aluminum phosphate pure crystal phase is generated at a relatively low temperature in a mode of combining a low-temperature liquid phase method and a solid-phase roasting method, and then crystal defects are eliminated and the lattice integrity is improved through solid-phase roasting at a relatively low temperature, so that the ionic conductivity of the material is improved.

The invention relates to the field of lithium ion battery positive electrode materials, in particular to a preparation method of a sodium titanium phosphate surface modified lithium iron phosphate positive electrode material. The problem that existing lithium iron phosphate is poor in rate performance and cycle performance is solved. The sodium titanium phosphate surface modified lithium iron phosphate positive electrode material comprises sodium titanium phosphate surface modified lithium iron phosphate powder, acetylene carbon black and polyvinylidene fluoride, according to the preparation method, firstly, gadolinium ions and dysprosium ions are added in the process of synthesizing lithium iron phosphate, electrostatic bonding between lithium ions and surrounding atoms is reduced, the rate performance is improved, then sodium titanium phosphate is synthesized, the sodium titanium phosphate has a three-dimensional lithium ion diffusion channel, the rate performance and the cycle performance of the lithium iron phosphate material are improved, and the lithium iron phosphate material can be used as a lithium ion battery. The lithium iron phosphate, glucose and polyethylene glycol are used as coating layers to be coated on the surface of the lithium iron phosphate; the rate capability and the cycle performance of the existing lithium iron phosphate material are remarkably improved, and the material can be applied to energy storage devices.

The invention belongs to the field of electric devices, and particularly discloses modified lithium titanium aluminum phosphate as well as a preparation method and application thereof. The modified lithium titanium aluminum phosphate comprises lithium titanium aluminum phosphate and a coating layer coating the lithium titanium aluminum phosphate, wherein the coating layer comprises a polyimide material. The modified lithium titanium aluminum phosphate has the characteristics of low moisture, low density, high temperature resistance, high wettability and high ionic conductivity, so that the diaphragm has the advantages of low surface density, low moisture content, high thermal stability, high ionic conductivity and high electrolyte wettability.