16results about How to "Stable crystal structure" patented technology

This invention relates to a boron-doped multi-element polyanionic sodium-ion battery cathode material and its preparation method, comprising the following steps: [The method involves] mixing Na₄Fe₂O₃ with... 3‑X B X (PO4) 2‑Y (SiO4) Y The stoichiometric ratio of P2O7 is determined by adding ferrous source, boric acid, sodium source, phosphorus source, and silicon source to water, followed by the addition of carbon source and mixing thoroughly to obtain a mixed slurry; wherein 0.2≤X≤0.5, 0<Y≤1; the mixed slurry is then ground to obtain a sand-milled slurry; the sand-milled slurry is dried to obtain precursor powder; under a protective atmosphere, the precursor powder is sintered at 450~550℃ to obtain boron-doped multi-element polyanion sodium-ion battery cathode material. The introduction of boron and silicon elements in this invention helps reduce raw material costs, improve the electrochemical performance of the material, especially enhancing the structural stability, rate performance, and cycle life of the cathode material, and also lowers the sintering temperature, meeting the requirements for cost reduction and efficiency improvement.

The invention provides a lithium manganate positive electrode material and a preparation method thereof, a positive plate and a battery, and belongs to the technical field of batteries, the structural general formula of the lithium manganate positive electrode material is Li1 + xMyMn2-(x + y) O4, x is greater than or equal to 0.1 and less than or equal to 0.33, y is greater than or equal to 0.005 and less than or equal to 0.01, M comprises at least one of Co, Ni, Cr and Fe, and the 111 crystal face diffraction peak intensity I111 of the lithium manganate positive electrode material is greater than 3100. According to the lithium manganate positive electrode material, the energy density, the effective gram volume and the structural stability of the lithium manganate positive electrode material, especially the performance of the lithium manganate positive electrode material in a low-voltage range of 2.0-3.3 V, are improved through lithium enrichment, doping of a proper proportion of M elements and synergistic cooperation of 111 crystal face diffraction peak intensity of the lithium manganate positive electrode material, so that the energy density, the effective gram volume and the cycling stability of the battery are improved, and the battery performance is improved. The battery service life is prolonged.

The invention discloses a high-temperature fire-resistant heat-insulation carbon fiber composite material which comprises the following components in parts by weight: 35-50 parts of wollastonite-feldspar composite powder, 25-35 parts of modified porous mullite aggregate, 12-20 parts of calcium aluminate cement, 2-8 parts of modified short carbon fibers, 1.5-2.5 parts of sodium dodecyl benzene sulfonate and 1-2 parts of sodium tripolyphosphate. The preparation method comprises the following steps: S1, weighing the wollastonite-feldspar composite powder, the modified porous mullite aggregate, the calcium aluminate cement and the modified short carbon fibers in proportion, and carrying out dry mixing; s2, adding water into sodium dodecyl benzene sulfonate and sodium tripolyphosphate, and stirring to obtain an auxiliary agent aqueous solution; s3, adding the auxiliary agent aqueous solution into the dry powder mixture, and stirring; s4, transferring the slurry into a mold for hydraulic forming; s5, the formed blank is subjected to curing, demolding, drying, high-temperature sintering and cooling, and the high-temperature fire-resistant heat-insulation carbon fiber composite material is obtained. The fire-resistant and heat-insulating carbon fiber composite material produced by the invention can improve the high temperature resistance and compression strength.

The invention provides a preparation method and application of a cathode material, and the preparation method of the cathode material comprises the following steps: weighing raw materials of a vanadium source, a phosphorus source, a potassium source and a rare earth element source, then adding water for dissolving, drying, calcining and ball-milling to obtain a rare earth element doped cathode material. The cathode material is high in energy density, stable in structure and good in conductivity, and the cycle performance of the battery can be improved. Particularly, a K < + > diffusion channel of the cathode material is obviously enlarged, and the cathode material has relatively high rate capability and has profound significance in application of the cathode material of the potassium storage secondary battery.

This application relates to the field of oxide target technology, specifically disclosing an ITZO target and its preparation method. The preparation method of the ITZO target includes the following steps: applying an In-containing... 3+ Sn 4+ Zn 2+ A complexing agent is added to the solution to obtain a mixed solution; the mixed solution is then added dropwise to an ammonia solution and aged to obtain a precursor precipitate; the precursor precipitate is then subjected to spray pyrolysis, cold isostatic pressing, and warm isostatic pressing to obtain an ITZO preform; the ITZO preform is then subjected to programmed temperature calcination and programmed temperature cooling to obtain an ITZO target. This application obtains a uniformly composed and highly dense ITZO target by dynamically controlling the composition of the mixed gas during the programmed temperature cooling process through two static pressing treatments; using this target, a transparent conductive film with high visible light transmittance and excellent electrical properties can be prepared by sputtering, solving the technical problems of uneven composition, low density, and poor quality of sputtered films in existing targets.

The invention discloses an inorganic plastic oxygen composite material and application thereof in a green agriculture and plant maintenance system. The inorganic plastic oxygen composite material is prepared from the following components: an inorganic internal peroxide bridge composite compound, an inorganic mediated catalytic material and a material balancing and stabilizing system, through the synergistic effect of all the components, the generation amount and the utilization efficiency of singlet oxygen are remarkably improved, and then the excellent pest control and pesticide residue degradation effects are achieved. In actual agricultural application, an aqueous solution prepared from the composite material can generate air containing singlet oxygen after being atomized and aerated, the air is uniformly released through a greenhouse pipeline, germ spores in the air can be quickly killed, and meanwhile, the composite material is sprayed on the surfaces of crops, so that mold and gray mold of the crops such as tomatoes and cucumbers can be effectively prevented and treated; the efficient degradation effect on organic phosphorus pesticide residues on the surfaces of the vegetables is realized. The whole technical scheme does not need to use chemical pesticides, meets the development requirements of green agriculture, can effectively reduce pesticide residue pollution, and protects the ecological environment of soil.

This invention relates to the field of manufacturing electrode materials for thermal batteries, specifically a method for preparing gold-doped sulfide materials. The invention employs a low-temperature hydrothermal method to construct a doped framework, forming a uniform and complete micron- and / or nano-scale Au dopant on the framework. Then, a sulfur-addition process is used to achieve a more stable embedding of the dopant within the FeS2 particles, resulting in excellent thermal stability and high effective discharge capacity when the product is used as a thermal battery. The product obtained by this invention has a discharge specific capacity greater than or equal to 361 mAh / g and an internal resistance less than or equal to 0.102 Ω. The process of this invention is simple and controllable, and the resulting product has excellent performance, facilitating industrial application.

The application discloses a primary battery positive electrode material and a preparation method thereof. α Cu β Mn γ O2 material; wherein, 0<=alpha<=0.15; 0<=beta<=0.4; when beta>0, 1<=beta+gamma<=1.2; when beta=0, gamma=1, and the volume expansion in the sodium ion embedding process during the battery discharging process can be reduced.

The application relates to a kind of surface nano fluorinated scandium lithium layer modification and near surface anion and cation co-doped nickel cobalt manganese ternary positive electrode material and its preparation method, belong to chemical energy storage battery technical field.According to the molar ratio of Li, Sc and F element 3:1:6, lithium salt, scandium salt and fluorine salt are weighed respectively, then ultrasonic is added in ethanol aqueous solution and is fully stirred to obtain mixed salt solution;Nickel cobalt manganese ternary positive electrode material is added to the mixed salt solution, heated and stirred until the suspension is dry, and then dried to obtain a powder;The powder is calcined in oxygen atmosphere to obtain a kind of surface nano fluorinated scandium lithium layer modification and near surface anion and cation co-doped modified nickel cobalt manganese ternary positive electrode material.The synergistic effect of Li3ScF6 surface coating and near surface lattice Sc, F co-doping improves the electrochemical performance and thermal stability of nickel cobalt manganese ternary positive electrode material.

The application discloses a low-strain silicon-carbon negative electrode material and a preparation method thereof. The preparation method comprises the following steps: S100, synthesizing MgV2O6 products from a magnesium source and a vanadium source; S200, mixing porous carbon and the MgV2O6 products to obtain a base material; and S300, performing vapor deposition on the outer surface and the pores of the base material by using a silane gas source and a carbon gas source in an inert gas to obtain a silicon-carbon negative electrode material. The MgV2O6 with a stable crystal structure is prepared from the magnesium source and the vanadium source, and rigid support is provided in the subsequent preparation process, so that the use stability and the thermal stability are improved. The silane gas source and the carbon gas source are vapor-deposited on the base material to generate silicon-carbon active substances in situ, so that the silicon atoms, the carbon atoms and the carbon atoms on the surface of the base material form firm chemical bonds, the stress generated when the silicon expands is absorbed by the internal structure of the silicon-carbon negative electrode material, and thus the silicon-carbon negative electrode material with high use stability is prepared.

The invention provides a positive plate, a preparation method and a battery. The positive plate comprises a positive current collector and a positive active material layer, the positive electrode active material layer comprises a first positive electrode active material layer and a second positive electrode active material layer which are sequentially arranged in the direction away from the surface of the positive electrode current collector, the first positive electrode active material layer comprises lithium nickel manganese oxide, and the second positive electrode active material layer comprises lithium nickel cobalt manganese oxide; the first positive electrode active material layer adopts lithium nickel manganese oxide, has a more stable crystal structure and stronger mechanical property, and can provide more stable adhesive force and a more stable interface as a bottom layer in contact with the positive electrode current collector, so that the overall mechanical property and thermal stability of the positive electrode plate are enhanced; the second positive electrode active material layer adopts low-cobalt nickel cobalt lithium manganate and can be in direct contact with an electrolyte, the capacity advantage of the second positive electrode active material layer is fully played, and meanwhile, the volume change of the second positive electrode active material layer is supported and constrained by a bottom layer stable structure, so that the cycling stability of a high-capacity material is remarkably improved.

The application discloses a preparation method of a lithium extraction adsorption membrane based on electrostatic spinning, and the method comprises the following steps: loading metatitanic acid lithium on polyacrylonitrile by using electrostatic spinning technology to obtain a polyacrylonitrile electrostatic spinning membrane loaded with metatitanic acid lithium; and then performing pickling in a forced flow-through mode to effectively convert the metatitanic acid lithium into metatitanic acid, thereby obtaining the lithium extraction adsorption membrane based on electrostatic spinning. The metatitanic acid lithium is prepared by calcining Li2CO3 and TiO2 at high temperature. The method provided by the application fixes the powder-shaped titanium-based lithium ion sieve on the polyacrylonitrile fiber by using the electrostatic spinning and the forced flow-through pickling mode. Compared with the prior art, the lithium extraction adsorption membrane based on electrostatic spinning prepared by the method provided by the application has higher adsorption capacity and faster adsorption rate, and is convenient for industrial application.

The application discloses a high-entropy doped lithium battery high-nickel ternary positive electrode material and a preparation method and application thereof, and relates to the technical field of lithium battery materials. The application discloses a high-entropy doped lithium battery high-nickel ternary positive electrode material and a preparation method and application thereof, and relates to the technical field of lithium battery materials. The application adopts a high-entropy doping strategy, utilizes the synergistic effect of multiple elements in a crystal lattice, significantly improves the crystal structure stability and interface stability of the material, and effectively inhibits phase transition and micro-crack generation of the high-nickel material in a long cycle process. The capacity retention rate of the obtained positive electrode material can reach 80% after 300 cycles, and the discharge specific capacity can still reach 146 mAh / g under 8 C high rate, and the positive electrode material exhibits excellent cycle stability and rate performance.

The application provides a lithium-rich manganese positive electrode material, and also provides a preparation method of the lithium-rich manganese positive electrode material, which comprises the following steps: preparing a lithium-rich manganese-based carbonate precursor according to a component proportion; mixing the lithium-rich manganese-based carbonate precursor with a lithium source according to a proportion, and then adding a tungsten source, and then pre-sintering and calcining under an air atmosphere to obtain the lithium-rich manganese positive electrode material. The application also provides a lithium ion battery. The lithium-rich manganese-based positive electrode material with excellent performance and low price is prepared by using the cheap tungsten element as an additive and by using a suitable sintering process.

This invention discloses a method for preparing a transition metal oxide / sulfide electrode material and a supercapacitor, belonging to the field of supercapacitor technology. The method includes: preparing a metal-organic framework material ZIF-67; using ZIF-67 and a sulfur source in a hydrothermal reaction to obtain a black solution; filtering the precipitate from the black solution onto a microporous membrane; washing and drying the precipitate to obtain Co3S4 / CoS; and heat-treating the Co3S4 / CoS in a muffle furnace to obtain the transition metal oxide / sulfide electrode material. This invention, based on ZIF-67 as a precursor, obtains the transition metal oxide / sulfide electrode material Co3S4 / CoS, which exhibits a high specific capacitance of 217.45 F g⁻¹ at 1 A g⁻¹, higher than that obtained using thioacetamide as a sulfur source in a hydrothermal reaction at 120°C for 48 h. After 2000 cycles, the capacity retention reaches 88.69%, demonstrating excellent cycling stability.

The invention belongs to the technical field of battery materials, and particularly relates to a coated modified nickel cobalt lithium aluminate positive electrode material as well as a preparation method and application thereof. The lithium nickel cobalt aluminate positive electrode material comprises an inner core and a coating layer coated on the inner core, a is greater than or equal to 1.01 and less than or equal to 1.05, x is greater than or equal to 0.75 and less than or equal to 0.90, y is greater than or equal to 0.05 and less than or equal to 0.20, z is greater than or equal to 0.01 and less than or equal to 0.05, and p is greater than or equal to 0 and less than or equal to 0.05; l comprises one of Mg, Zr, Mo, Ti and Zn; and the tap density of the coated and modified nickel cobalt lithium aluminate positive electrode material is 2.7-3.2 g / cm < 3 >. The coated modified nickel cobalt lithium aluminate positive electrode material provided by the invention has relatively good electronic conductivity and rate capability, and can inhibit lattice collapse caused by phase change under high voltage, reduce intergranular gaps, enhance thermal stability of the material, inhibit capacity fading caused by structure looseness in charge and discharge processes, and prolong the cycle life of a battery.