| 초록 |
Recently, research on silicon (Si)-based anodes for a lithium (Li) ion has been conducted to reduce the volume expansion during electrochemical cycling using such approaches as the development of various structures and the use of dopant. Such structures, however, face difficulties in mass production, and the electrochemical mechanism for the effect of dopant of Si on the kinetics of Li ion battery anodes has not been thoroughly elucidated to date. Herein, we present a new process of repetitively producing micro Si rods at different levels of boron (B) doping using laser interference lithography (LIL) and metal assisted chemical etching (MACE), which enables mass-production of Si rods from one patterned Si, thereby saving time and cost. Moreover, the effect of p-type dopant (B-doping) and its concentration, as well as the structure shape, on the electrochemical battery performance is studied. In particular, the lightly B-doped Si rods (1015 atoms cm-3) anode exhibits the highest capacity and cycling performance due to the highest kinetics of de/lithiation related to phase transition and diffusion. This study provides a new approach for easy and rapid preparation of the electrode material and elucidates the dependence of the electrochemical performance on the level of B doping. |
