88results about "Alkali titanates" patented technology

This invention provides a titanium-layer-constructed, synergistic low-eutectic salt regenerated waste lithium nickel cobalt manganese oxide cathode material. The preparation method includes the following steps: cutting the electrode sheet and placing it in an N-methylpyrrolidone solution, ultrasonically dissolving, filtering, washing, drying, and sieving to obtain the waste lithium nickel cobalt manganese oxide material; mixing the obtained waste lithium nickel cobalt manganese oxide cathode material with a titanium source, then adding a lithium source and mixing evenly to obtain a composite material; sintering the composite material in a two-stage process under an oxidizing atmosphere, cooling to room temperature, to obtain the regenerated waste lithium nickel cobalt manganese oxide cathode material with lithium replenishment and repair. The resulting material has a core-shell coated structure, with a lithium metatitanate layer as the coating layer and a titanium-doped lithium nickel cobalt manganese oxide core. The regenerated material exhibits uniform doping and coating, excellent rate performance, and significantly improved charge / discharge capacity and cycle stability.

A titanium-containing oxide powder which is mainly composed of a titanium-containing oxide represented by Li4Ti5O12 or Ti1-X / 2Nb2O7-X (wherein 0 ≤ X < 2), and which is characterized by containing particles of the titanium-containing oxide and a solvation ionic liquid that is composed of an Li salt and an organic solvent.

This invention discloses a type of sodium titanate with a layered crystal structure, its preparation method, and its application in aqueous magnesium-ion batteries, belonging to the field of aqueous magnesium-ion battery technology. This invention uses sodium titanate with a layered crystal structure as the negative electrode material in aqueous magnesium-ion batteries. Due to its excellent chemical and structural stability, sodium titanate can achieve reversible magnesium deposition in aqueous magnesium electrolytes. 2+ Intercalation / extraction. This invention synthesizes Na via a hydrothermal method and a high-temperature annealing process. 2 Ti 2 O 5 And Na 2 Ti 3 O 7 Materials. In magnesium chloride electrolyte, both sodium titanate materials exhibit extremely low charge / discharge potentials (Na). 2 Ti 2 O 5 -1.3 to -0.6V vs. SCE; Na 2 Ti 3 O 7 (-1.5 to -1V vs. SCE) and good cycle stability. Furthermore, Na... 2 Ti 2 O 5 The half-cell exhibits a charge-discharge specific capacity of up to 213 mAh / g at a current density of 2 A / g, and maintains a high specific capacity of 150 mAh / g even at a high current density of 10 A / g. The sodium titanate of this invention is an ideal anode material for aqueous magnesium batteries, possessing both low cost and environmental friendliness, and shows great promise for application in the field of aqueous magnesium-ion energy storage.

A method for preparing a nano-titanate, a nano-titanic acid and a nano-TiO2 containing embedded A nanoparticles is provided respectively. In this method, a Ti-T alloy with a A-group element solidly dissolved therein is used as a titanium source, and reacted with an alkali solution under a certain condition. In combination with subsequent treatment, the preparation of a titanate nanotube, a titanic acid nanotube, and a TiO2 nanotube / rod containing embedded A nanoparticles, respectively, is further achieved with high efficiency and low cost. Moreover, a method for preparing metal nanoparticles is also provided by removing the matrix of the composites. The present preparation methods is characterized by simple process, easy operation, high efficiency, low cost. The product is of promising application in polymer-based nanocomposites, ceramic materials, catalytic materials, photocatalytic materials, hydrophobic materials, effluent degrading materials, bactericidal coatings, anticorrosive coatings, marine coatings.

The invention discloses a production system of high-flowability moisture-proof sodium potassium titanate, and relates to the technical field of sodium potassium titanate, the production system comprises a pulsed electric field in-situ moisture-proof layer synthesis unit, a multistage cyclone coupling fluidized bed modification unit and a block chain quality closed-loop control unit, the pulsed electric field in-situ moisture-proof layer synthesis unit comprises a nitrogen-protected closed reaction kettle, a high-frequency ultrasonic disperser and a multi-stage pulsed electric field generator, the high-frequency ultrasonic disperser applies a 0.5-20 MHz pulsed electric field, the field intensity of the pulsed electric field is 10-30 kV / cm, the duty ratio of the pulsed electric field is 15%-90%, and the multi-stage pulsed electric field generator is used for generating the moisture-proof layer. The high-frequency ultrasonic disperser enables a nano rare earth silicate composite coating layer to be generated in situ on the surface of sodium potassium titanate particles, the thickness of the nano rare earth silicate composite coating layer is 10-50 microns, the humidity sensitivity of the nano rare earth silicate composite coating layer is 0.1%-0.3%, the multi-stage rotational flow coupling fluidized bed modification unit comprises three stages of fluidized beds which are arranged in series, and the three stages of fluidized beds are connected in parallel. The inclination angle of the inclination-angle-adjustable swirl nozzle array arranged at each stage is 10-60 degrees, and the distance is 1.2-2.5 times of the particle diameter.

The present invention relates to a negative electrode active material for a lithium secondary battery, a method for preparing same, and a lithium secondary battery comprising same. More specifically, the negative electrode active material comprises one selected from Li1.1Ti0.9O2 and a mixture in which Li1.1Ti0.9O2 and carbon nanotubes (CNTs) are mixed in a weight ratio of 8:2 to 9:1. The negative electrode active material for a lithium secondary battery, comprising the above-described components has an R-3m structure, and provided is a lithium secondary battery which exhibits high capacity and excellent lifespan characteristics, and in particular, exhibits high capacity during high-rate charging and discharging.

Provided are: coated flaky titanic acid particles, which can form a design coating film with a good silky texture and shadowed appearance when flaky titanic acid is applied to an organic solvent-based paint and, which can also sufficiently suppress discoloration (yellowing) of the coating film even in a relatively severe environment, such as prolonged exposure to ultraviolet light; and a production method therefor.　The surface of the flaky titanic acid particles has an oxide and / or hydroxide of aluminum, and an anionic surfactant present thereon. Preferably, the anionic surfactant is a hydrocarbon-based anionic surfactant having 5 or more carbon atoms in the main chain or a fluorinated anionic surfactant having 4 or more carbon atoms. Said production method comprises: a step for maintaining an aqueous slurry, which contains flaky titanic acid particles and an aluminum source, at a temperature of 50-95°C inclusive and at a pH of 5-12 inclusive to treat the surface of the flaky titanic acid particles with an oxide and / or hydroxide of aluminum; and a subsequent step for mixing the obtained flaky titanic acid and an anionic surfactant in a solution.

The invention discloses a positive and negative electrode interface cooperative processing method of an LTO-LMFP all-solid-state battery. The method comprises the following steps: preparing a lithium titanate negative electrode material by adopting a solid phase method or a hydrothermal method; mixing the prepared lithium titanate powder with a lithium phosphate precursor according to a certain proportion; after mixing, carrying out heat treatment on the mixture to promote the lithium phosphate to uniformly form a coating layer on the surfaces of the lithium titanate particles; a coprecipitation method or a solid-phase method is adopted to prepare the lithium manganese iron phosphate positive electrode material, so that the interface impedance is obviously reduced, and the physical contact and chemical compatibility between the electrode material and a sulfide solid electrolyte are effectively improved through a lithium phosphate coated lithium titanate negative electrode and a Mg-doped manganese phosphate coated lithium manganese iron phosphate positive electrode. The lithium phosphate and manganese phosphate coating layer is used as an interface buffer layer and can fill interface gaps, increase the effective contact area and provide a more stable ion transmission channel, so that the interface impedance between the positive electrode and the negative electrode and the solid electrolyte is greatly reduced, and rapid migration of lithium ions is promoted.

The present invention relates to a method for preparing a nano-titanate, a nano-titanic acid and a nano-TiO2 containing doping E or embedding E nanoparticles, and the use thereof. By using an E-doped Ti-T intermetallic compound as a titanium source, and reacting the E-doped Ti-T intermetallic compound with alkaline solution at atmospheric pressure and near its boiling-point temperature, an E-doped titanate nanofilm is prepared at atmospheric pressure with high efficiency and in a short time. Through acid treatment and (or) heat treatment, a titanate nanofilm containing embedding E nanoparticles, an E-doped titanic acid nanofilm, and a titanic acid nanofilm and a TiO2 flake powder containing embedding E nanoparticles can be further prepared. Through a subsequent reaction at high temperature and pressure, the preparation of an E-doped titanate nanotubes and titanic acid nanotubes, and titanic acid nanotubes and TiO2 nanotubes / nanorods containing embedding E nanoparticles can be achieved in high efficiency and low-cost.

The invention relates to the field of lithium ion batteries, and discloses low-water-absorption lithium titanate, a preparation method thereof, a negative pole piece, a lithium battery and electric equipment. According to the invention, the specific water-resistant polymer protective layer is added on the surface of the lithium titanate material, so that the adsorption to moisture is reduced, the requirement on the humidity of the environment is reduced, and the lithium titanate battery manufacturing process environment is favorably achieved. The prepared lithium titanate pole piece is coated with the protective film, so that the side reaction between the electrolyte and the pole piece after the battery is manufactured in the later period can be reduced, and the gas production problem of the lithium titanate battery can be relieved. The polymer coated protective film on the surface of the lithium titanate material can form a protective layer similar to an SEI (solid electrolyte interface) film in the subsequent charging and discharging process of the lithium titanate battery, so that the stability of the lithium titanate battery is improved. According to the application of the low-water-absorption lithium titanate, the humidity requirement of the lithium titanate battery manufacturing process can be reduced, the lithium titanate battery manufacturing process achievement rate can be improved, the lithium titanate manufacturing process cost and energy consumption can be reduced, and large-scale manufacturing is easy.

The invention relates to a phosphate positive electrode active material based on green cyclic utilization and a preparation method and application thereof, and belongs to the field of secondary batteries. The invention synthesizes a phosphate positive electrode active material LiFex1Nbx2Mgx3Tix4PO4 / D1D2 based on green cyclic utilization, wherein x < 1 > lt is more than or equal to 0.90; 1, 0 < = x2lt; 0.05, 0 < = x3lt; 0.05, 0 lt; x4lt; 0.05, D1 and D2 are respectively a first conductive coating layer and a second conductive coating layer, the D1 conductive coating layer is a nitrogen-sulfur-boron doped composite carbon layer based on an organic framework, and the D2 conductive coating layer is a fast ion conductor of lithium. The phosphate positive electrode active material based on green cyclic utilization is prepared by using the alkaline sodium borohydride aqueous solution to remove aluminum skimmings and a compounding process, so that the raw material utilization rate is greatly improved, and the environment bearing pressure is greatly reduced. Through the design of the composite doped conductive layer, the cycle stability, the rate capability and the high and low temperature performance of the phosphate-based positive electrode material are greatly improved, and the phosphate-based positive electrode material has a relatively good market prospect.

The present invention relates to a lithium-titanium complex oxide, a preparation method thereof, and a lithium secondary battery comprising the same and, more specifically, to a lithium-titanium complex oxide which maintains appropriate pores within particles, and which is prepared by adding a pore inducing material in the wet-milling step to adjust sizes of primary particles of the lithium-titanium complex oxide, a preparation method thereof, and a lithium secondary battery comprising the same. Since a lithium-titanium complex oxide having reduced sizes of primary particles, the lithium-titanium complex oxide according to the present invention shortens a moving distance of lithium ions by adding the pore inducing material, diffusion rate of the lithium ions is increased. Thereby, a battery comprising the lithium-titanium complex oxide according to the present invention exhibits excellent output characteristics by having a structure favorable to electron transport.

The present invention provides a sodium battery positive electrode material, the chemical formula of the sodium battery positive electrode material is xNaMBO3.yNa2Ti3O7.zNa3V2(BO3)3 / C, where the molar ratio of x, y and z is 0.94-0.96:0.02-0.03:0.02-0.03, M is Fe and Mn, the molar ratio of Fe and Mn is 8-9:1-2, and the mass fraction of carbon in the sodium battery positive electrode material is 1.2%-1.5%. The sodium battery positive electrode material provided by the present invention has high capacity, high voltage platform, stable structure, high cycle performance, and its manufacturing method is simple, low cost, and short process flow.

The invention relates to a preparation method and application of chromium-doped sodium titanate with high cycle stability, the chromium-doped sodium titanate is formed by solid-phase sintering of Na2CO3, nano TiO2 and Cr2O3, and optimized Cr-Na2Ti3O7 has excellent cycle stability; the preparation method comprises the following steps: taking a certain amount of Na2CO3, nano TiO2 and Cr2O3 in a corresponding proportion, adding a small amount of isopropanol, and carrying out ball milling in a ball milling instrument for 5-8 hours; completely drying in a drying box, and putting the dried product into a tubular furnace; in a closed atmosphere of high-purity argon, carrying out solid-phase sintering for 10-12 hours by adopting a step-by-step calcination method, and naturally cooling to room temperature; when the material is used as a negative electrode of a sodium ion battery, the coordination environment of sodium ions can be changed, an interlayer Ti-O bond is optimized so as to optimize an interlayer structure, the irreversible capacity generated by Na2Ti3O7 in the charge-discharge cycle process is obviously reduced, and the cycle stability and the rate performance of the battery are improved; the preparation method has important significance for developing a high-performance negative electrode material of the sodium-ion battery and improving the performance of the sodium-ion battery.

The invention belongs to the technical field of lithium battery materials, and particularly relates to a method for synthesizing nano lithium titanate, which comprises the following steps: mixing an oxalic acid solution with scrapped denitration catalyst powder, and filtering, washing and drying to obtain acid leaching residues after the reaction is finished; alkali liquor and the acid leaching residues are mixed and then react in a closed reaction kettle, and after the reaction is finished, solid titanate powder is obtained through filtering, washing and drying; the method comprises the following steps: heating and mixing an acid solution and solid titanate powder, cooling, filtering, washing and drying to obtain metatitanic acid powder; adding metatitanic acid powder, a lithium source, deionized water and ball milling balls into a ball milling tank, and drying after ball milling to obtain a lithium titanate precursor; and roasting the lithium titanate precursor in air, and grinding to obtain the lithium titanate powder. According to the method, the nano lithium titanate is synthesized by taking metatitanic acid obtained by resource recovery of the waste denitration catalyst as a titanium source, the reaction process speed is high, the product purity is high, the cost can be effectively saved, mining of mineral resources is effectively reduced, energy is saved, carbon is reduced, and the method has the advantages of environmental protection and green development.

The disclosure relates to barium strontium titanate, and to a barium strontium titanate fine particle powder, characterized in that the average primary particle size of the primary particles is 50 nm or less, and the difference between the theoretical lattice constant and the lattice constant is 0 Å or more and 0.0080 Å or less. The disclosure also relates to a method for producing a barium strontium titanate fine particle powder, characterized in that a titanium raw material is mixed with an alkaline aqueous solution, a neutralization reaction is performed to obtain a hydrous titanium hydroxide slurry, the slurry is washed with water and heated, the slurry is added to a mixed solution of an aqueous strontium solution and an aqueous barium solution, and a wet reaction is carried out at a temperature range of 100 to 300°C, followed by washing the slurry with water and drying the slurry.

A porous particulate nanocomposite material comprising, as determined by X-ray diffraction: carbon; an orthorhombic CaTiO3 crystalline phase; and, a rhombohedral MgTiO3 crystalline phase. Based on the total number of atoms in the nanocomposite material and as determined by energy dispersive X-ray spectroscopy (EDX): the atomic concentration of carbon (C) is from about 1 to about 5 atom % (at. %); the atomic concentration of titanium (Ti) is from about 20 to about 35 at. %; the atomic concentration of magnesium (Mg) is from about 5 to about 15 at. %; and, the atomic concentration of calcium (Ca) is from about 5 to about 15 at. %.

A process for the preparation of non-fibrous alkaline titanates comprising the steps of: melting alkaline titanate in a furnace at a temperature ranging from 1300° C. to 1500° C. to form a molten product; cooling said molten product by placing it in contact with a material having a temperature equal to or lower than 15° C.

The invention relates to a doped sodium trititanate composite material as well as a preparation method and application thereof, and belongs to the technical field of sodium ion batteries. The doped sodium trititanate composite material comprises: a matrix composed of sodium titanate, aluminum doped in the surface region of the sodium titanate and magnesium doped in the bulk phase region of the sodium titanate; the chemical formula of the matrix is Na < 2-2x > Mg < x > Ti < 3-0.75 y > Al < y > O < 7 >, x is more than or equal to 0.01 and less than or equal to 0.05, and y is more than or equal to 0.002 and less The carbon conductive layer is formed by amorphous carbon and coats the surface of the substrate; and the electrolyte layer is composed of Na3PS4 and coats the surface of the carbon conductive layer. From the perspective of material thermodynamics, phase change is effectively inhibited by Al / Mg doping; in the aspect of interface chemistry, Na3PS4 is adopted to stabilize a solid electrolyte interface; and meanwhile, the preparation process is optimized from the aspect of process compatibility, so that the preparation of the doped sodium trititanate composite material with excellent performance is realized.

The invention discloses a graphite composite material and a preparation method thereof, a negative plate, an electrochemical device and electronic equipment. The graphite composite material sequentially comprises an inner core, a first coating layer and a second coating layer from inside to outside, the inner core comprises porous graphite and a silicon simple substance, and at least part of the silicon simple substance exists in pores of the porous graphite; the first coating layer is a carbon coating layer; the second coating layer comprises lithium titanate; the silicon elementary substance accounts for 18%-27% of the mass of the graphite composite material; the mass percent of the lithium titanate in the graphite composite material is 0.5%-1.2%; the specific pore volume of the limited pores of the graphite composite material is 0.09 cm < 3 > / g to 0.21 cm < 3 > / g, and the limited pores refer to pores with the pore diameter of 0.2 nm to 5 nm. When the graphite composite material provided by the invention is applied to the lithium ion battery, the lithium ion battery has both capacity and long circulation.

The present invention relates to sodium-carbon metatitanate core-shell particles, their preparation methods, and their uses as an active anode material in sodium-ion batteries. (no figure)

A lithium titanium composite oxide including aluminum-coated primary particles and a method for manufacturing the same are disclosed. A lithium titanium composite oxide including aluminum-coated primary particles according to an embodiment is manufactured by coating lithium titanium oxide primary particles with aluminum by mixing an aluminum compound with re-pulverized particles and then by spray-drying the mixture again to prepare secondary particles. A battery including the lithium titanium composite oxide including the aluminum-coated primary particles exhibits effects of suppressing electrolyte decomposition and gas generation that may be respectively caused by titanium ions and residual lithium in conventional lithium titanium composite oxides.

A negative electrode active material for a secondary battery and a lithium secondary battery including the same. The negative electrode active material for a secondary battery, includes lithium titanium-based composite particles comprising: a lithium titanium oxide represented by LixTiyOz, wherein x, y and z satisfy 0.1≤x≤4, 1≤y≤5 and 2≤z≤12, Zr doped into the lithium titanium oxide; and an aluminum and sulfur containing compound coated on a surface of the lithium titanium oxide. The aluminum and sulfur containing compound is present in an amount of 0.4 mM to 0.9 mM based on 1M lithium titanium oxide.

A material comprising zirconium-doped lithium titanate, wherein the zirconium-doped lithium titanate contains zirconium in a concentration of 0.1-5 mol percent based on the sum of titanium and zirconium.

The invention provides a graphene-coated lithium titanate composite material and a preparation method thereof, and relates to the technical field of battery materials, the graphene-coated lithium titanate composite material comprises the following components by mass: 80-95 parts of a lithium titanate matrix, 1-10 parts of a graphene layer, and 0.5-5 parts of a dispersant; the surface of the lithium titanate matrix is coated with the graphene layer, and the dispersing agent is used for dispersing graphene in the graphene layer; the graphene layer is of a continuous and compact structure; by accurately controlling the number of graphene layers, the thickness of the coating layer and the use amount of the dispersing agent, the graphene forms a continuous and compact nano armor coating layer on the surface of the lithium titanate, so that the defect of low electronic conductivity of the lithium titanate is overcome, and the problem of conductive path breakage caused by graphene agglomeration is avoided; the two-dimensional flexible structure of graphene and the zero-strain characteristic of lithium titanate generate a synergistic effect, so that agglomeration and corrosion of lithium titanate particles in the circulation process can be effectively inhibited, and the volume micro-change during lithium ion intercalation and deintercalation is buffered.

The invention relates to an oxygen vacancy modified metal oxide material and a preparation method and application thereof, and the method comprises the following steps: placing a metal oxide in a strong reducing agent solution in an inert atmosphere environment for standing, after the reduction reaction is finished, removing redundant liquid on the upper layer, then adding a cleaning agent, stirring for a period of time, and then standing, so as to obtain the oxygen vacancy modified metal oxide material. Removing redundant liquid on the upper layer in the container; repeating the step for repeated cleaning for multiple times until the residual strong reducing agent on the surface of the oxide is cleaned; and collecting the metal oxide material, and carrying out vacuum drying to obtain the oxygen vacancy modified metal oxide material. The oxygen vacancy modified metal oxide material is applied to the field of energy storage. The method is simple in step, normal in temperature and pressure, low in cost, high in universality and capable of achieving large-scale production, and more importantly, the oxygen vacancy concentration of the metal oxide material can be accurately regulated and controlled by adjusting the reaction time and the raw material ratio; the prepared oxygen vacancy modified metal oxide material can be applied to the field of energy storage.

The present invention relates to a positive electrode active material for a secondary battery, a positive electrode including the same, a secondary battery, and a method for manufacturing the same, and more particularly to a positive electrode active material including a core and a nitrogen-containing lithium oxide-containing coating layer.

The present invention provides a friction modifier which, when used in a friction material, can increase the friction coefficient for a high-load region.　Provided is a friction modifier constituted by a titanate, wherein the titanate is a salt of one or more types of element selected from the group consisting of alkali metals and alkali earth metals, and the decomposition rate of the titanate when the titanate is heated for one hour at 800°C in a nitrogen atmosphere is 30-100 mass%.

The embodiment of the present application relates to a calcium ion doped modified sodium lithium titanate material and a preparation method thereof, a negative plate and a battery, and belongs to the technical field of lithium ion battery negative materials.The embodiment of the present application aims to solve the technical problems of poor conductivity, low reversible capacity and poor cycle stability of sodium lithium titanate as a negative material in the prior art.The calcium ion doped modified sodium lithium titanate material of the embodiment of the present application has a chemical molecular formula of: Na2Ca x Li 2‑x Ti6O 14 , wherein the value range of x is 0 <= x <= 0.30.The material provided in the embodiment of the present application shows a higher discharge specific capacity, a lower internal resistance and a better cycle life in electrochemical tests, which indicates that the material has potential in the application of lithium ion batteries and can meet the performance and cycle life requirements.

The application provides a lithium titanate battery material, a preparation method and application thereof. The preparation method comprises the following steps: mixing part of a titanium source and a lithium source, and performing ball milling to obtain initial ball milling products; mixing the initial ball milling products with the remaining titanium source, and continuing to perform ball milling to obtain ball milling products; and sequentially performing drying, calcining and screening on the ball milling products to obtain the lithium titanate battery material. By adding the titanium source in batches in the ball milling process, a part of the titanium source is attached to the ball milling particles, which can effectively reduce the volatilization of lithium during high-temperature calcining in the later stage, and can form TiO2 on the surface of the lithium titanate after calcining, thereby playing the role of a conductive agent, and further inhibiting the polarization of the electrode due to high current, and making up for the deficiency of the lithium titanate material. The method is helpful to improve the utilization rate of the lithium source, improve the conductive performance of the lithium titanate sample, improve the stability and production efficiency of the product.