METHOD FOR PREPARING LITHIUM ION BATTERY SILICON ANODE THROUGH COMBINATION OF DIFFUSION WELDING AND DEALLOYING WITH LASER SURFACE REMELTING TECHNIQUE

摘要

A method for preparing a lithium ion battery silicon anode through combination of diffusion welding and dealloying with laser surface remelting technique, comprising: preparing an aluminum-silicon alloy precursor by a laser surface remelting technique; welding the aluminum-silicon alloy precursor to a current collector through a diffusion welding process; and using a corrosive agent to remove element aluminum from the precursor to finally obtain a silicon anode metallurgically bonded to the current collector. The silicon material prepared according to the method is metallurgically bonded to the current collector, thus shedding of the silicon material from the current collector can be avoided effectively during charging and discharging; in addition, the operation is simple and efficiency is high.