2results about How to "Many defects" patented technology

The invention provides a method for preparing a flat ultrathin lithium foil negative electrode based on ultrasonic rolling, and belongs to the technical field of lithium battery negative electrodes, and the method comprises the following steps: carrying out primary ultrasonic rolling treatment on a lithium strip to form a lithium foil with the thickness of not more than 20 microns; compounding the lithium foil and a current collector through a cold pressing method to form a lithium foil negative electrode A; performing secondary ultrasonic rolling treatment on the lithium foil negative electrode A to obtain a lithium foil negative electrode B; the lithium foil negative electrode B is immersed in acetone for ultrasonic vibration aging treatment, and a lithium foil negative electrode C is obtained; and immersing the lithium foil negative electrode C in acetone for cleaning, and carrying out vacuum drying to obtain the flat ultrathin lithium foil negative electrode. A two-stage ultrasonic rolling technology of first high-amplitude impact and second low-amplitude impact is introduced, the technology utilizes an energy converter to efficiently convert alternating voltage into high-frequency mechanical vibration, the double advantages of ultrasonic impact and static pressure rolling are ingeniously fused, and the defects that in the prior art, the relative error of effective thickness is large, the surface roughness is high, and the machining precision is high are overcome. And therefore, the technical defects of poor film forming effect and poor battery cycle performance are overcome.

The application provides a silicon-doped titanium lithium ion sieve and a preparation method and application thereof, and particularly relates to the technical field of ion sieve preparation. 1‑x Si x O3; wherein 0 The silicon-doped titanium lithium ion sieve provided by the application introduces silicon elements in the crystal structure, uses the high-electronegativity tetravalent silicon atoms to replace a small part of low-electronegativity tetravalent titanium atoms, breaks the regularity of rapid formation of titanium-oxygen bonds and rapid growth of [TiO6] octahedrons on one hand, controls the crystal growth speed, perfects the crystal defects at high temperature, and obtains a small-particle-size titanium lithium ion sieve precursor beta-Li2TiO3 at high temperature, and uses the higher stability of Si-O bonds than Ti-O bonds, so that the synthesized lithium ion sieve has higher acid resistance and lower titanium dissolution loss rate.