7results about How to "Uniform nucleation" patented technology

The invention discloses a process for preparing a V2O3 / ZnV2O3 total battery by simultaneously using vanadium oxide in a zinc ion battery as a positive electrode material and a negative electrode material, which comprises the following steps: reacting ammonium metavanadate with absolute ethyl alcohol by adopting a solvothermal synthesis method, washing, drying, and calcining in a tubular furnace to obtain V2O3; in the preparation process of the V2O3 positive electrode material, only V2O3, acetylene black serving as a conductive agent and PVDF serving as a binder are mixed in proportion and then are coated on graphite paper, other coating protection materials do not need to be introduced into a V2O3 / Zn negative electrode, and V2O3 is used as a protection layer to inhibit growth of zinc dendrites, relieve hydrogen evolution side reaction of the zinc negative electrode and reduce corrosion of zinc. Vanadium oxide V2O3 is directly used as a core positive electrode material, the zinc negative electrode coating is developed by utilizing the characteristics of the vanadium oxide V2O3, a material is formed, meanwhile, the performance optimization of the positive electrode and the negative electrode is realized, the used raw materials are simple and easy to obtain, the process is simple and easy to implement, and the preparation process is simple and easy to implement from V2O3 raw material synthesis to positive and negative electrode piece preparation to V2O3 / ZnV2O3 total battery assembly. And comprehensive improvement of positive and negative electrode performances of zinc ions is simultaneously realized by a single material.

This invention relates to the field of batteries, and more particularly to a positive electrode material, a method for preparing the same, and a battery. The positive electrode material includes a core and a coating layer covering at least a portion of the surface of the core; the core has the general chemical formula Na3V. 1.925 M 0.075 (PO4)3, where M is a transition metal element; the coating layer includes carbon materials, which include nitrogen-doped amorphous carbon and carbon nanotubes introduced by acidified carbon nanotubes. The cathode material provided by this invention can significantly improve the low-temperature, high-rate, and long-cycle electrochemical performance. Thanks to the synergistic effect of structural optimization and interface regulation, the polarization of the material is significantly reduced under low-temperature and high-current charge-discharge conditions, and the rate performance and cycle stability are significantly improved, enhancing the practicality and reliability of sodium-ion batteries in large-scale energy storage and wide-temperature applications.

This invention provides a method for preparing high bulk density potassium peroxymonosulfate composite salt. Through multi-dimensional process optimization including multi-point feeding and neutralization, ultrasonic action, crystal guiding agent, heating-heating-heating-cooling, and drying-mixing-sieving, the bulk density of PMS is synergistically improved, and the overall performance of the final product is superior to that of the prior art.

The invention belongs to the technical field of single crystal materials, and particularly relates to a SrxBi2Se3 topological superconducting single crystal material and a space preparation method and application thereof. The size of the SrxBi2Se3 topological superconducting single crystal material is larger than or equal to 10 mm * 8 mm * 0.5 mm, the superconducting transition temperature of the SrxBi2Se3 topological superconducting single crystal material is larger than or equal to 3 K, and the doping amount of Sr in the SrxBi2Se3 topological superconducting single crystal material is larger than or equal to 70% of the actual using amount of Sr. Wherein x is more than 0 and less than or equal to 0.3. The preparation method of the SrxBi2Se3 topological superconducting single crystal material has the beneficial effects that the SrxBi2Se3 topological superconducting single crystal material is prepared in a microgravity environment, ideal conditions without convection and sedimentation are provided, solute segregation can be effectively inhibited, uniform nucleation and growth are promoted, and proper conditions are provided for growth of Sr-doped Bi2Se3 single crystals. The microgravity environment is based on a space station experiment platform, and efficient and high-quality space preparation of the SrxBi2Se3 single crystal is achieved.

The application belongs to the technical field of luminescent materials, and particularly relates to a preparation method of pure green light fluorine-doped perovskite quantum dot solution. Formamidinium bromide solution, PbBr2 solution, a ligand and a light coupling agent are uniformly mixed to obtain a precursor solution; the precursor solution is added into an anti-solvent, stirred and reacted, a terminating agent is added to terminate the reaction, centrifugal separation is carried out, a solid is obtained, a solvent is added into the solid and uniformly mixed, centrifugal separation is carried out, filtration is carried out, and a colloidal solution is obtained; a fluorine dopant is added into the colloidal solution to react, reaction is carried out under ultraviolet light irradiation, centrifugal separation is carried out, a solid is obtained, a solvent is added into the solid and uniformly mixed, and the pure green light fluorine-doped perovskite quantum dot solution is obtained. In the application, the light coupling agent and the fluorine ion synergistically act, the prepared pure green light fluorine-doped perovskite quantum dot solution has excellent thermal stability, can realize green light emission in the range of 525-535 nm, has great commercial application potential, the preparation method is simple and easy to operate, the process is stable, and the process flow is controllable.

This invention relates to the field of fuel cell catalytic materials technology, specifically to a Pt anti-reverse electrode catalyst supported on molybdenum-ruthenium oxide for fuel cell anodes and its preparation method. The catalyst uses molybdenum-ruthenium oxide with a loose, porous structure as a support, and highly dispersed Pt nanoparticles as the active component, wherein Ru (Ru) serves as the active site for the oxygen evolution reaction (OER) under reverse electrode conditions. The method first utilizes a glucose blowing method and urea pyrolysis process to prepare a nitrogen-doped molybdenum-ruthenium oxide support through two-stage heat treatment under an oxidizing atmosphere. Subsequently, Pt nanoparticles are uniformly loaded onto the support surface using a polyol reduction method under an alkaline environment and an inert atmosphere. This invention utilizes the unique support structure and the OER activity of Ru to efficiently catalyze the OER reaction during anode reverse electrode conditions, suppressing excessive anode potential rise, thereby avoiding carbon support corrosion, protecting the integrity of the catalyst layer structure, and improving the durability and service life of proton exchange membrane fuel cells.

The present application belongs to the technical field of flame-retardant materials, and particularly relates to a prismatic aluminum hypophosphite compound, a preparation method and application thereof. The prismatic aluminum hypophosphite compound comprises aluminum hypophosphite, layered montmorillonite and nano-silicon dioxide, wherein the weight percentage of the layered montmorillonite is 0.043-0.087 wt% and the weight percentage of the nano-silicon dioxide is 0.0036-0.0181 wt% based on 100% of the weight of the aluminum hypophosphite; the D10 particle size of the prismatic aluminum hypophosphite compound is 1-3 microns, the D50 particle size is 5-8 microns, the D90 particle size is 10-15 microns, and the D97 particle size is less than 20 microns; and the prismatic aluminum hypophosphite compound has a single prismatic crystal structure or a regular structure in which multiple prismatic crystals are embedded with each other. The prismatic aluminum hypophosphite compound has a specific morphology and is particularly suitable for a polyurethane flame-retardant system.