9results about How to "Evenly doped" patented technology

This invention discloses a zirconium-lanthanum bulk co-doped high-nickel ternary material, its preparation method, and a battery. The zirconium-lanthanum bulk co-doped high-nickel ternary material is a ternary cathode material with bulk co-doped zirconium and lanthanum; the chemical formula of the ternary cathode material is LiNi. x Co y Mn (1‑x‑y) O2, wherein 0.8≤x≤0.9, 0≤y≤0.1; the total molar amount of zirconium and lanthanum is 1%~5% of the total molar amount of nickel, cobalt and manganese. The zirconium-lanthanum bulk co-doped high-nickel ternary material provided by the present invention enhances the mechanical strength of the ternary material through the bulk co-doping of zirconium and lanthanum, suppresses cracking and pulverization of the ternary material during charge and discharge, and improves cycle stability; at the same time, the two elements Zr and La synergistically stabilize the lattice, reduce lithium-nickel mixing, suppress irreversible phase transformation and lattice oxygen precipitation, achieve dual stability of bulk phase and interface, and improve the consistency and stability of the zirconium-lanthanum bulk co-doped high-nickel ternary material.

The application discloses a preparation method of nitrogen-doped carbon-silicon nanofibers and application of the nitrogen-doped carbon-silicon nanofibers in a lithium ion battery negative electrode material, and belongs to the technical field of lithium ion battery negative electrode materials. The method comprises the following steps: mixing silicon nanoparticles and a carbon source, performing electrostatic spinning, stabilization treatment and carbonization treatment, and obtaining carbon-silicon nanofibers; and then mixing the carbon-silicon nanofibers with a nitrogen source, performing heat treatment under an inert atmosphere, making nitrogen elements doped into a carbon skeleton, and obtaining nitrogen-doped carbon-silicon nanofibers. The material obtained by the application is a one-dimensional nanofiber structure, silicon particles are uniformly wrapped in carbon fibers, and nitrogen elements are uniformly distributed in the carbon skeleton. The method can realize uniform nitrogen doping while maintaining the microstructure of the material, and significantly improves the electronic conductivity and interface stability of the material. The material obtained by the application is used as a lithium ion battery negative electrode, and exhibits high reversible capacity and excellent cycle stability.

The utility model relates to the technical field of semiconductor material preparation, and disclose a kind of N type high-purity silicon target material red phosphorus doping device, including reaction chamber, rotating support mechanism, phosphorus vapor injection system, partition temperature control module, gas circulation unit and intelligent control system, reaction chamber adopts quartz material double-layer structure, the inner wall of reaction chamber is provided with silicon nitride coating, the outer wall of reaction chamber is provided with vacuum pump set, rotating support mechanism includes high-temperature ceramic support, magnetic fluid seal shaft and brushless motor, high-temperature ceramic support is connected with the output end of brushless motor by magnetic fluid seal shaft, by integrated reaction chamber, rotating support mechanism, phosphorus vapor injection system, partition temperature control module, gas circulation unit and intelligent control system, by rotating dynamic doping, intelligent temperature control and waste gas circulation technology, significantly improve the uniformity of doping and raw material utilization rate, realize the efficient, uniform doping of silicon target material.

The invention discloses a molybdenum-rhenium alloy and a preparation method thereof. Belongs to the alloy field. The preparation method of the molybdenum-rhenium alloy provided by the invention comprises the following steps: smelting molybdenum-rhenium-lanthanum oxide alloy powder by adopting a vacuum electric arc to prepare a molybdenum-rhenium alloy casting blank; machining the molybdenum-rhenium alloy casting blank to obtain a molybdenum-rhenium alloy plate; the molybdenum-rhenium alloy plate is subjected to pre-strain plastic deformation treatment at the temperature of 25-1500 DEG C, and the molybdenum-rhenium alloy is obtained; the pre-strain plastic deformation treatment comprises the following steps: unloading to a zero stress state after applying 0.25%-2.5% of pre-strain quantity each time, and circulating for 100-1000 times. According to the molybdenum-rhenium alloy for improving the alpha texture strength through the deformation cumulative effect, the strength of the molybdenum-rhenium alloy with the low rhenium content is remarkably improved, the dosage dependence of rhenium resources is greatly reduced, and the production cost is reduced.

This invention belongs to the field of electrocatalyst technology, and specifically relates to a graphene-based sheet-like porous catalyst, its preparation method, and its application. The preparation method includes: separately preparing an aqueous dispersion of graphene oxide and an aqueous dispersion of nano-melamine-formaldehyde resin, mixing them, and stirring to obtain a mixed dispersion; mixing the mixed dispersion with a hydroxyl-containing compound, adjusting the pH to weakly alkaline, stirring, concentrating, and drying to obtain a dried product; and subjecting the dried product to high-temperature pyrolysis. This method can prepare a sheet-like nitrogen-doped carbon-based non-noble metal electrocatalyst with stable mechanical properties, abundant pore structure, and high nitrogen content. It exhibits excellent electrochemical catalytic performance, has a simple preparation method, mild reaction conditions, and can achieve uniform nitrogen doping.

This invention provides a gradient doping mixing device for high-energy-density, high-efficiency anode materials, belonging to the field of materials processing technology. It includes a main body structure comprising a shell, a feeding funnel fixedly connected to the top of the shell, a feeding trough on one side of the shell, a fixing trough on the other side of the shell, and a feeding assembly fixedly connected to the inner wall of the feeding trough. A stirring mechanism includes a connecting trough on the inner wall of the shell and a stirring chamber welded to the surface of the connecting trough. This invention utilizes a three-dimensional mixing structure formed by the first and second stirring blades of the stirring assembly, with through-holes dispersing the material's impact force and enhancing turbulence. A trapezoidal block in the main body guides the material to the feeding chute, and the feeding assembly drives a baffle plate via a screw to precisely control the flow rate at the outlet, reducing material residue. The fixing trough and limiting trough ensure the stability of the equipment operation, and the overall structural design improves the production efficiency of the anode materials.

This invention belongs to the field of lithium-ion battery material technology, specifically relating to a high-nickel single-crystal ternary cathode modified material and its preparation method. The method includes: ball milling a high-nickel single-crystal ternary precursor, lithium hydroxide monohydrate, and a cerium-tantalum co-doped lithium molybdenum oxyfluoride compound, followed by pre-sintering and high-temperature calcination under an oxygen atmosphere to obtain single-crystal powder particles; then mixing the single-crystal powder particles with a calcium-doped lithium boron phosphorus oxynitride compound, drying, and holding under a nitrogen atmosphere before sieving. The cerium-tantalum co-doped lithium molybdenum oxyfluoride compound is prepared by ball milling, drying, and segmented sintering of lithium carbonate, cerium oxide, tantalum oxide, molybdenum oxide, and lithium fluoride in a protective powder; the calcium-doped lithium boron phosphorus oxynitride compound is prepared by ball milling, segmented sintering, and ball milling and sintering with lithium nitride under nitrogen protection. This invention significantly improves the structural stability and electrochemical performance of the high-nickel single-crystal ternary cathode material.

This application relates to a uniformly doped rod-shaped gallium nitride powder and its preparation method. The gallium nitride powder has a regular morphology, uniform size, high purity, and high crystallinity, and can be used as a key functional material for high-end optoelectronic devices, power semiconductors, and advanced packaging. The method uses metallic gallium as raw material and introduces dopant simultaneously during the hydrothermal synthesis of gallium oxyhydroxide precursor, so that the target element is embedded in situ during the lattice construction stage, achieving atomic-level uniform bulk doping. This fundamentally avoids the problems of uneven doping, "doped islands," concentration gradients, and surface enrichment caused by traditional post-doping methods. The obtained precursor is directly converted into uniformly doped rod-shaped gallium nitride powder by a one-step high-temperature nitridation. This process is short, simple to operate, and environmentally friendly, effectively solving the problems of uneven doping, poor crystallinity, severe agglomeration, and complex processes in the prior art, and providing an efficient and scalable technical path for the controllable preparation of high-performance gallium nitride powder.