2results about How to "Increase supersaturation" patented technology

This invention provides a cobalt tetroxide with a compact inner structure and a loose outer structure, its preparation method, and its application. The preparation method includes the following steps: first, a reaction solution containing seed crystals is prepared; then, a second cobalt-aluminum mixed salt solution and a second precipitant solution are co-flowed into the reaction solution containing seed crystals to perform a crystal growth stage, obtaining a reaction solution containing a first intermediate; subsequently, a salt solution containing doped elements, a third cobalt-aluminum mixed salt solution, and a third precipitant solution are co-flowed into the reaction solution containing the first intermediate to perform a second co-precipitation reaction, obtaining a second intermediate; finally, the intermediate is calcined to obtain the cobalt tetroxide with a compact inner structure and a loose outer structure. This preparation method, by controlling the reaction conditions in stages, obtains a cobalt tetroxide with a compact inner structure and a loose outer structure, meeting the requirements for high tap density, high structural strength, and good conductivity, thereby improving the energy density and electrochemical performance of lithium-ion batteries.

The application relates to the field of high polymer foaming materials, and particularly discloses a preparation method of elastic polypropylene composite foaming beads, the foaming beads and a molded product thereof, and the preparation method of the elastic polypropylene composite foaming beads comprises the following steps: uniformly mixing polypropylene resin, alpha-olefin elastomer and an additive, melt plasticizing, the ratio of the melt mass flow rate of the polypropylene resin to that of the alpha-olefin elastomer being 1:1-3, to obtain a composite; injecting a supercritical fluid, the supercritical fluid accounting for 0.5-3.0 wt% of the total mass of the composite, mixing and melting to obtain a mixed melt; gradiently cooling the mixed melt, then extruding, cutting and drying, then adding a dispersion medium and a foaming agent, impregnating through pressurization and heating, then releasing pressure to foam, washing, drying and curing, to obtain the foaming beads; the molded product is obtained by water vapor heating molding of the foaming beads; and the foaming beads have the advantages of good compatibility and dispersibility, good heat resistance, high expansion ratio, high elasticity and dimensional stability.