867results about "Niobium compounds" patented technology

The invention belongs to the technical field of solid electrolyte materials, and particularly relates to a novel preparation method of a solid electrolyte with high ionic conductivity. The lithium source, the lanthanum source, the niobium source and the fluorine source are mixed, and the solid-phase dispersing agent is added in the mixing process, so that more uniform mixing is facilitated. According to the preparation method, precursor powder is obtained after mixing, then pure-phase LLNOF powder can be directly obtained through one-step sintering, the difficulty that in an existing reported preparation process scheme, a product obtained through two-step sintering has an impure phase is overcome, the preparation process is simple, and batch production and industrialization are facilitated.

The invention discloses a molybdenum disulfide and lithium-lanthanum-niobium-oxygen co-coated lithium-rich manganese-based positive electrode material and a preparation method thereof, and realizes double uniform coating of molybdenum disulfide and lithium-lanthanum-niobium-oxygen on the surface of the lithium-rich manganese-based positive electrode material by combining freeze drying and calcining technologies. The double coating layer not only can be used as a stable protective layer to prevent the positive electrode material from being eroded, but also can form a stable coating structure by utilizing the physical and electrochemical compatibility between two adjacent elements of molybdenum and niobium in the same period, so that the electrochemical performance is optimized, the'deoxidation 'phenomenon is avoided, and the service life of the positive electrode material is prolonged. Under co-coating of the molybdenum disulfide and the lithium lanthanum niobium oxide, the lithium-rich manganese-based positive electrode material co-coated with the molybdenum disulfide and the lithium lanthanum niobium oxide is obtained, and the lithium-rich manganese-based positive electrode material co-coated with the molybdenum disulfide and the lithium lanthanum niobium oxide can guarantee the first effect and the specific capacity of the battery and can fully optimize the cycle performance of the battery.

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

The invention relates to a silicon-carbon composite material, a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: adding porous carbon into a fluidized bed, heating and introducing alkaline mixed gas to obtain amino porous carbon; transferring the amino porous carbon into fluidized bed equipment, vacuumizing, heating, and introducing hydroxyl silane gas for nano silicon deposition; after deposition, introducing ultraviolet light for polymerization and oxidation to obtain a modified silicon-carbon precursor material; transferring the modified silicon-carbon precursor material into a tubular furnace, introducing inert gas to discharge air in the tube, and performing first carbonization to obtain a silicon-carbon material; and adding the resin into an organic solvent, adding the fast ion conductor and the silicon carbon material to be uniformly dispersed, performing spray drying, and performing secondary carbonization to obtain the fast ion conductor coated silicon carbon composite material. The preparation method provided by the invention is simple and efficient, and the prepared silicon-carbon composite material can improve the fast charging performance and is suitable for a negative electrode material of a high-energy-density lithium ion battery.

The invention discloses manganese and cerium co-doped modified sodium niobate, which is prepared from Nb2O5, MnO2, CeO2 and sodium hydroxide. The invention further discloses magnesium-based bone cement with the sonodynamic / nano-enzyme antibacterial function and the piezoelectric osteogenesis function. The magnesium-based bone cement is prepared from CaHPO4, NaH2PO4, MgO powder, hydroxyapatite and manganese-cerium co-doped modified sodium niobate. The magnesium-based bone cement with sonodynamic / nano-enzyme antibiosis and piezoelectric osteogenesis provided by the invention has piezoelectric enhanced sonodynamic and nano-enzyme synergistic antibacterial activity and piezoelectric osteogenesis activity, effectively removes bacteria / biological membranes, realizes combination of antibiosis and bone repair under different ultrasonic powers, effectively treats infectious bone defects, and has a good application prospect. The treatment effect of the MPC basal bone repair material is obviously improved.

The invention relates to the technical field of lithium ion batteries, in particular to a composite lithium-rich manganese-based positive electrode material and a preparation method and application thereof. The composite lithium-rich manganese-based positive electrode material is of a three-layer structure and sequentially comprises a lithium-rich manganese-based oxide positive electrode material matrix, a first coating layer and a second coating layer from inside to outside, the first coating layer is a mixture of halide solid electrolyte and lithium-containing oxide; and the second coating layer is an oxide solid electrolyte. The conductivity of a contact interface with a positive electrode material can be improved, the resistance is reduced, the moisture absorption degradation of halide is inhibited, the packaging difficulty is reduced, and the cycle performance of the halide-added solid electrolyte after moisture absorption is improved.

The invention relates to active electrode materials and to methods for the manufacture of active electrode materials. Such materials are of interest as active electrode materials in lithium-ion or sodium-ion batteries. The invention provides an active electrode material comprising a mixed niobium oxide, wherein the mixed niobium oxide has the composition M1aM2i-aM3bNbi2-bO33-c-dQd, wherein: M1 and M2 are different; M1 is selected from Mg, Ca, Sr, Y, La, Ce, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ni, Cu, Zn, Cd, B, Al, Ga, In, Si, Ge, Sn, Pb, P, Sb, Bi and mixtures thereof; M2 is Mo or W; M3 is selected from Mg, Ca, Sr, Y, La, Cc, Ti, Zr, Hf, V, Ta, Cr, Mo, W, Mn, Fe, Co, Ni, Cu, Zn, Cd, B, Al, Ga, In, Si, Ge, Sn, Pb, P, Sb, Bi, and mixtures thereof; Q is selected from F, Cl, Br, I, N, S, Se, and mixtures thereof; 0<a<0.5; 0<b<2; −0.5<c<1.65; 0<d<1.65; one or more of b and d is >0.

A positive electrode material includes: a positive electrode active material; a coating layer covering at least part of the surface of the positive electrode active material; and a second solid electrolyte. The coating layer includes a first solid electrolyte. The first solid electrolyte includes Li, M1 and F. M1 is at least one selected from the group consisting of Ti, Al and Zr. The second solid electrolyte includes Li, M2, O and X. M2 is at least one selected from the group consisting of Ta and Nb. X is at least one selected from the group consisting of F, Cl, Br and I.

Rechargeable lithium-ion cells and implantable medical devices including the same are provided herein with niobium-based negative electrodes and high voltage positive electrodes. Electrode active materials are provided herein, including pseudoternary compositions within a Ti-Nb-W-O pseudoternary system and / or including titanium, niobium, oxygen, and an elemental dopant. Rechargeable lithium-ion cells provide herein with niobium-based negative electrodes afford improved energy density, and, more particularly, provide improved energy density at operating voltages for use in implantable medical devices.

The invention provides a preparation method of magnesium niobate, which comprises the following steps: carrying out wet ball milling on MgO and Nb2O5, uniformly mixing, and drying to obtain mixed powder; the mixed powder is heated to 1500-1700 DEG C for 1-3 h and then subjected to water quenching, and solid particles of a core-shell structure inclusion are obtained; and heating the solid particles to 1000-1200 DEG C, and carrying out heat preservation to obtain the magnesium niobate. Solid particles of a core-shell structure inclusion are formed through a water quenching process, then MN obtained through rapid heating sintering is high in purity and stability, Mg < 2 + > and Nb < 5 + > in the MN are high in uniformity and large in reaction activity, sufficient mixing with PbO and TiO2 at a high temperature is facilitated to form a liquid phase, the formed raw material for PMNT crystal growth is better in singleness and uniformity, and the preparation method is simple and easy to implement. Furthermore, the PMNT single crystal with a single perovskite structure, high purity and excellent piezoelectric property can be obtained, and the yield is improved.

Disclosed is a method of fabricating a self-standing Graphene Oxide (GO) membrane comprising a plurality of layers of crosslinked GO sheets, the method comprising using a crosslinking agent to crosslink between oxygen-containing functional groups of neighbour GO sheets, wherein the crosslinking agent is a metallic oxide or a carbide.

The invention provides an oxide-modified positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: 1) reacting metal salt with a precursor alcohol solvent for a certain time to form a solution A; 2) mixing the coated substrate material with an anti-solvent to form a solution B; (3) mixing the solution A obtained in the step (1) with the solution B obtained in the step (2), and forming a uniform and continuous coating layer with controllable thickness on the surface of the coating substrate material to obtain uniformly coated powder; and 4) calcining the uniformly coated powder obtained in the step 3) to form the oxide modified positive electrode material. The oxide-modified positive electrode material can be used for remarkably prolonging the cycle life and improving the rate capability of the positive electrode material of the lithium ion battery, and has very high practical value and application prospect.

The invention belongs to the technical field of solid electrolytes, and relates to a selenium-doped sulfide solid electrolyte as well as a preparation method and application thereof. The general chemical formula of the sulfide solid electrolyte is Li < 6 + / -iP < 1-x > MxS < 5-y > SeyX, i is greater than or equal to 0 and less than 1, x is greater than 0 and less than 1, y is greater than 0 and less than 1, M is one or more of Zr, Ta, Nb, Mo, Bi, In and Y, and X is one or more of Cl, Br and F. According to the invention, the selenium element with larger ionic radius and lower electronegativity is introduced to replace the sulfur element, and Zr, Ta, Nb, Mo, Bi, In or Y elements are introduced, so that the doped sulfide solid electrolyte system has excellent stability to air, organic solvents and lithium while ensuring high ionic conductivity, and the assembled all-solid-state battery shows excellent cycle stability.

To provide a stabilized solid garnet electrolyte article, a method of making the stabilized solid garnet electrolyte article, and a method for using the stabilized solid garnet electrolyte article in an energy storage device.SOLUTION: A solid garnet composition comprises: a bulk composition consisting of or consisting essentially of a lithium garnet; and a surface composition consisting of or consisting essentially of a surface protonated garnet on at least a portion of the exterior surface of the lithium garnet, wherein the surface composition is compositionally stable in air and insensitive to carbon dioxide.SELECTED DRAWING: None

The present invention relates to a niobium metal oxide, niobium metal oxide secondary particles and a method for preparing the same, and a working electrode and an electrochemical cell comprising the niobium metal oxide secondary particles. The niobium metal oxide has the formula (I): NbxMyOz, where M is a metal selected from the group consisting of Ti, Zr, V, Cr, W and Mo, x is 2 to 18, z is 2.5 x + 3y and x / y is 1 to 3, and the crystal structure of the niobium metal oxide is a tetragonal tungsten bronze structure having four or eight pentagonal channels per cell, and a portion of the pentagonal channels is filled with-Nb-O-Nb-O-chains, and the remainder of the pentagonal channel is optionally embedded with lithium.

The invention discloses a preparation method of an oxychloride electrolyte material, the oxychloride electrolyte material and an all-solid-state battery, and the method comprises the following steps: providing raw materials; the raw materials comprise metal chloride and lithium hydroxide; and reacting the metal chloride in the raw material with lithium hydroxide in an inert gas atmosphere to obtain the oxychloride electrolyte material generated by the reaction. Lithium hydroxide is used as a lithium raw material, the price is low, the preparation cost is reduced, hydrogen chloride is generated in the mixing preparation process, an acidic catalysis environment is provided, and the preparation time is shortened; an oxygen element and a chlorine element are introduced into the prepared oxychloride electrolyte material, an oxygen-chlorine frame structure formed by the oxygen element and the chlorine element is an obvious flexible ion frame structure, and the ion frame structure reduces the diffusion activation energy of lithium ions, so that the room-temperature ion conductivity of the oxychloride electrolyte material is improved.

The invention belongs to the technical field of powder metallurgy. More specifically, the invention relates to a preparation method of ultrafine niobium oxide. The preparation method comprises the following specific preparation steps: taking 90-100 parts by weight of gelatin solution with the mass fraction of 3-5%, 60-80 parts by weight of fluorine niobate solution with the mass fraction of 10-15% and 4-10 parts by weight of aluminum salt solution with the mass fraction of 3-6%; mixing the fluorine niobate solution, the aluminum salt solution and the gelatin solution, and ultrasonically dispersing uniformly to obtain a mixed solution; dropwise adding a precipitant into the mixed solution in a stirring state to adjust the pH value to 9-10, continuously stirring and reacting, refrigerating and standing for 24-56 hours at the temperature of 2-6 DEG C, drying and crushing to obtain a crushed material; calcining the crushed material in an air atmosphere, and then cooling and scattering to obtain a calcined material; and pickling the obtained calcined material with hydrochloric acid, washing with water, and drying to obtain the ultrafine niobium oxide.

The invention belongs to the field of lithium ion battery raw materials, and particularly relates to a niobium-based composite material and a preparation method and application thereof. The composite negative electrode material is composed of a niobium-based framework material, a high-capacity material and a coating material. The niobium-based composite negative electrode material takes a porous niobium-based material as a framework, so that the characteristics of high stability, high safety and rapid charging and discharging of the niobium-based negative electrode material are kept; the high-capacity material is embedded in a niobium-based skeleton pore structure, so that the gram volume of the niobium-based material is improved, and meanwhile, the problem of rapid capacity attenuation caused by high volume expansion of the high-capacity material is solved; the coating material coats the surfaces of the niobium-based framework and the high-capacity material, and the high-capacity material is sealed in holes of the niobium-based framework material, so that on one hand, the conductivity of the niobium-based material can be improved, on the other hand, precipitation of the high-capacity material is inhibited, and the cycling stability of the composite negative electrode material is further improved. And the prepared niobium-based composite negative electrode material is simple in preparation process flow and has good adaptability to the preparation process of the existing lithium ion battery.

The invention provides a production method and application of niobium hydroxide in tantalum-niobium hydrometallurgy, and relates to the technical field of tantalum-niobium hydrometallurgy. Tantalum-niobium ore is ground to obtain tantalum-niobium particles; hydrofluoric acid and sulfuric acid are added into the tantalum-niobium particles for a decomposition reaction, and decomposition liquid containing tantalum and niobium is obtained; carrying out acid regulation on the decomposition liquid containing tantalum and niobium, and then extracting with MIBK (Methyl Isobutyl Ketone) to obtain a loaded organic phase containing tantalum and niobium; carrying out acid pickling on the tantalum-niobium loaded organic phase to obtain a tantalum-niobium loaded phase; extracting the tantalum-niobium load phase by using an anti-niobium solution to obtain a fluoroniobic acid solution; adding urea into the fluoroniobic acid solution to carry out neutralization reaction, and filtering to obtain a niobium hydroxide crude product; leaching the niobium hydroxide crude product, and drying after leaching to obtain a niobium hydroxide product; the urea is used as the neutralizer for neutralization, liquid ammonia is not used any more, the production risk is greatly reduced, and the safety production cost is reduced.

The invention provides a composite negative electrode material, a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: S1, preparing a carbon source and graphite particles into first slurry, and performing first drying and first calcining on the first slurry to obtain a first precursor; s2, preparing a titanium source and the first precursor into second slurry, and performing first reaction and second drying on the second slurry to obtain a second precursor; and S3, preparing a niobium source, a lithium source and the second precursor into third slurry, and carrying out second reaction and second calcination on the third slurry to obtain the composite negative electrode material. Through specific process conditions, the structure for preparing the composite negative electrode material is designed, so that the composite negative electrode material has the graphite core, the carbon layer and the inorganic conductive layer are sequentially formed on the surface of the composite negative electrode material, and the obtained structure can remarkably improve the cycling stability and the electrochemical performance of the composite negative electrode material, so that the service life of a battery is prolonged.

The invention provides a lithium manganese iron phosphate positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment, and relates to the technical field of new energy. According to the lithium manganese iron phosphate positive electrode material provided by the invention, the amorphous precursor and the high-crystallization precursor are used as raw materials, and the high-crystallization precursor causes a relatively high specific surface area of the material and affects the processability; the amorphous precursor can improve the compaction density and the specific surface area of the material, and the capacity and the cycle performance of the lithium manganese iron phosphate positive electrode material are ensured by combined use of the two precursors. The combination of elements with different valence states is used, so that the doping and coating effects are achieved at the same time, and the performance of the material is synergistically improved; elements with relatively low valence states are easily doped in a lithium manganese iron phosphate crystal structure, so that the capacity of the material is improved; and elements with relatively high valence states are distributed on the surfaces of lithium manganese iron phosphate particles, so that the stability of the surface structure of the material is improved.

A ternary paraelectric having a Cc structure and a method of manufacturing the same are provided. The ternary paraelectric having a Cc structure includes a material having a chemical formula of A2B4O11 that has a monoclinic system, is a space group No. 9, and has a dielectric constant of 150 to 250, wherein “A” is a Group 1 element, and “B” is a Group 5 element. “A” may include one of Na, K, Li and Rb. “B” may include one of Nb, V, and Ta. The A2B4O11 material may be Na2Nb4O11 in which bandgap energy thereof is greater than that of STO. The A2B4O11 material may have relative density that is greater than 90% or more.

The invention provides a modified lithium cobalt oxide positive electrode material and a preparation method thereof.The modified lithium cobalt oxide positive electrode material is of a core-shell structure and comprises a magnesium-aluminum-doped lithium cobalt oxide core material serving as the core-shell structure and a coating layer formed on the surface of the magnesium-aluminum-doped lithium cobalt oxide core material, and the coating layer is lithium titanium aluminum phosphate, lithium niobate and lithium phosphate; the chemical formula of the lithium titanium aluminum phosphate is Li < 1 + x > Al < x > Ti < 1 + 1-x > (PO4) 3, the chemical formula of the lithium niobate is Li3NbO4, the weight of the coating layer accounts for 0.2-2% of the weight of the modified lithium cobalt oxide positive electrode material, the weight ratio of the lithium titanium aluminum phosphate to the lithium niobate in the coating layer is 1: (0.4-2), and the chemical formula of the magnesium-aluminum doped lithium cobalt oxide core material is LiCo < 1-a-b-c > Mg Al Nb < c > O2. The modified lithium cobalt oxide positive electrode material provided by the invention has better battery performance at high temperature, high voltage and high rate.

A modified lithium-rich manganese-based positive electrode material, and a preparation method therefor and the use thereof. The modified lithium-rich manganese-based positive electrode material comprises a lithium-rich manganese-based positive electrode material, wherein the bulk phase of the lithium-rich manganese-based positive electrode material is doped with a high-valent transition metal element, and the surface phase of the lithium-rich manganese-based positive electrode material has a lithium metal compound coating layer and an oxygen vacancy. In the modified lithium-rich manganese-based positive electrode material, the doping with a bulk-phase high-valence transition metal element, the coating with a surface-phase lithium metal compound coating layer and the construction of an oxygen vacancy are conducted at the same time; and by means of the co-action of the three, the rate capability and the cycling performance of the lithium-rich manganese-based positive electrode material can be significantly improved, which is of great significance for the further commercialization of the lithium-rich manganese-based positive electrode material.

The invention discloses a modified ruthenium-based acidic oxygen evolution catalyst as well as a preparation method and application thereof, and belongs to the technical field of nano materials and catalysis. The preparation method comprises the following steps: firstly, mixing a mixed solution of transition metal salt and soluble ruthenium salt with a complex ligand dispersion liquid, then evaporating and curing to obtain a metal chelate precursor, and finally performing pyrolysis oxidation to obtain the metal chelate. The transition metal salt comprises at least one of soluble Nb, Ti, Cr, Mn, Co, Cd, Sn and Sb metal salts. The preparation process is simple and easy to implement, the precursor salt is flexible to select, the synthesis method has high expansibility in preparation of the nano oxide, a preparation way is provided for application of the nano oxide in the fields of energy, environment, sensing and the like, and the prepared modified ruthenium-based acidic oxygen evolution catalyst is small and uniform in particle, clean in surface, free of ligands and suitable for industrial production. The catalyst shows high activity and high stability on oxygen evolution reaction, and a new choice is provided for a commercial anode catalyst for producing hydrogen by electrolyzing water.

The invention discloses an oxide electrode for a lithium ion battery and a preparation method of the oxide electrode, and belongs to the technical field of lithium ion batteries. The preparation method of the titanium-niobium oxide negative electrode material comprises the following steps: weighing corresponding titanium dioxide powder and niobium pentoxide powder according to the chemical dosage ratio of TixNbyO2x + 2.5 y, putting the titanium dioxide powder and the niobium pentoxide powder into a mortar, fully grinding, uniformly mixing to obtain a precursor, uniformly coating and flatly paving the precursor on a slide, putting the slide under laser heating equipment, and carrying out high-temperature sintering to obtain the titanium-niobium oxide negative electrode material. And finally, preparing the product into a pole piece assembled battery, and carrying out electrochemical test on the pole piece assembled battery. According to the method, the solid-phase synthesis time is remarkably shortened through laser heating, the rate capability and the cycle performance of the battery are improved, and the preparation efficiency of the material is improved on the basis of ensuring high-quality formed phase and fine and uniform particle size.

A niobic acid compound dispersion according to the present invention contains: niobium; at least one element X selected from the group consisting of alkali metal elements and alkaline earth metal elements; and a phosphorus compound and / or a chlorine compound. The niobic acid compound dispersion has a particle diameter (D50) of at most 1000 nm as obtained by a dynamic light scattering method. An other niobic acid compound dispersion according to the present invention contains: niobium; at least one element X selected from the group consisting of alkali metal elements and / or alkaline earth metal elements; and a phosphorus compound and / or a chlorine compound. The niobic acid compound dispersion has a maximum value of at least 70%T for transmittance in the wavelength range of 400-760 nm.

The invention discloses a double-metal gradient diffusion layer modified high-nickel ternary positive electrode material and a preparation method thereof. The preparation method comprises the following steps: filtering and uniformly dispersing high-nickel ternary positive electrode material powder; introducing inert gas into the atomic layer deposition system, and raising the temperature to a target temperature; respectively preheating the metal precursors A and B to proper temperatures; the preparation method comprises the following steps: sequentially introducing a metal precursor A, precursor water, a metal precursor B and precursor water into a reaction chamber, alternately depositing according to a pulse-reaction-purging sequence, and repeatedly circulating the process to obtain the bimetallic oxide coated high-nickel ternary positive electrode material, and post-annealing treatment. According to the bimetal gradient diffusion layer modified high-nickel ternary positive electrode material prepared by the preparation method disclosed by the invention, the lithium storage performance of the high-nickel ternary material is greatly improved, excellent cycling stability and rate capability are obtained, the coating layer is accurate and controllable, the preparation process is simple, meanwhile, large-batch production can be realized, and relatively high application value is achieved.

The invention relates to the technical field of lithium ion batteries, in particular to a low-temperature positive electrode material, a preparation method thereof, a positive plate and a lithium ion battery. The low-temperature positive electrode material comprises a base material and a coating layer, the preparation raw materials of the low-temperature positive electrode material comprise a first precursor and a second precursor, and the mass ratio of the first precursor to the second precursor is n; n, the average size r of single crystal particles of the low-temperature positive electrode material, the pole piece compaction density PD of the positive electrode piece containing the low-temperature positive electrode material, and the particle size d99 and particle size dmin of the low-temperature positive electrode material meet the condition that (n * PD * d99) / (dmin * r) is greater than or equal to 30 and less than or equal to 100. The low-temperature positive electrode material is low in cost and good in low-temperature charge-discharge performance.

The invention relates to a mixed-phase oxide for use as an active electrode material. e.g. in lithium-ion or sodium-ion batteries. The mixed-phase oxide comprises Nb and Ti and further comprises M(III) and / or M(II); wherein M(III) is selected from Cr, Al, Ga, and mixtures thereof; M(II) is selected from Zn, Cu, Mg, and mixtures thereof; wherein the mixed-phase oxide comprises an interpenetrating mixture of a first phase and a second phase; wherein the first phase has the crystal structure of TiNb2O7 and the second phase has the crystal structure of Zn2Nb34O87.