2results about How to "Achieve directional alignment" patented technology

The application discloses a method for preparing a radial ordered ultra-high nickel positive electrode material precursor, which comprises the following steps: applying a constant magnetic field parallel to the stirring shaft to the reaction system in the growth reaction stage of the coprecipitation reaction, utilizing the weak magnetism of the ultra-high nickel precursor crystal nucleus to induce the directional arrangement of the primary crystal grains along the magnetic field direction, and cooperating with the axial flow field in the reaction kettle to orderly assemble the directional arrangement of the primary crystal grains to form the spherical secondary particles with the radial ordered structure. Through the magnetic field regulation, the high-precision orientation of the primary particle of the precursor along the radial direction is realized, the phase change stress of the ultra-high nickel positive electrode material in the charging and discharging process can be significantly relieved after the obtained precursor is subjected to the lithiumization sintering, the micro-cracks are inhibited, the cycle stability is greatly improved, the method is simple and controllable, and the industrial production is easy, so the method has a wide application prospect.

This invention proposes a method for preparing KNN textured ceramics based on the ice template method, including freezing slurry preparation, directional freezing, freeze drying, directional pressing, and debinding sintering. In the directional pressing step, the pressing direction is perpendicular to the lamellar structure, and the pressing pressure is 50-100 MPa, resulting in a dense ceramic body. The KNN ceramic preparation method proposed in this invention uses the ice template method combined with template grain growth technology to achieve the directional arrangement of lamellar template grains in the ceramic body, simplifying the preparation process of KNN textured ceramics and significantly reducing the amount of organic additives. The KNN ceramics prepared by this invention achieve a texture degree of 86%.