2results about How to "Improved size distribution" patented technology

The invention discloses super aluminum-titanium-boron, a preparation process thereof and an aluminum-based alloy, TiB2 is obtained by directly adding TiB2 powder, the particle size of the TiB2 is 0.5-3 microns, and the TiB2 accounts for 2-5% of the total amount of raw materials. The preparation process of the super aluminum titanium boron comprises the following steps: step 1, weighing according to parts by weight; step 2, alloying for the first step; step 3, alloying in the second step; step 4, degassing and refining; and 5, continuous casting and continuous rolling. Compared with an aluminum-titanium-boron alloy prepared by a conventional villiaumite method, the granularity of aluminum and aluminum alloy is reduced by 30-50% after the aluminum and aluminum alloy are refined; the refining capability of the aluminum-titanium-boron alloy can be effectively ensured; the aluminum-based composite material prepared by adding 0.1%-0.2% of super aluminum titanium boron into aluminum is high in comprehensive performance, the ductility of the aluminum-based composite material reaches 4.5 + / -0.3%, the tensile strength of the aluminum-based composite material is larger than or equal to 480 Mpa, and the yield strength of the aluminum-based composite material is larger than or equal to 400 Mpa.

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.