Abstract
The commercial graphite anode materials possessing a low theoretical specific capacity cannot meet the increasing demand for high energy density lithium-ion batteries. The high theoretical specific capacity and considerable safety of silicon monoxide (SiOx, 0 < x < 2) indicate its potential utility to be employed as the next-generation anode materials. However, there are some limitations, such as unstable structure and low conductivity in the charging and discharging processes. In this study, SiOx/Cu3Si/Cu composite was synthesized via self-selective electroless deposition and rapid thermal processing method. The Cu3Si alloy formed by the rapid thermal processing method improved the structural stability of the electrode materials and enhanced the reaction kinetics of the electrode. Finally, the discharge specific capacity of the obtained SiOx/Cu3Si/Cu composite material was found to be 1091.9 mAh·g−1 under a current density of 0.5C (1C = 2.1 A g−1) after 150 cycles, which was 439.2 mAh·g−1 high than that of SiOx. The discharge specific capacity of SiOx/Cu3Si/Cu was 872.4 mAh·g−1 at 2 C, which was 361.2 mAh·g−1 higher than that of SiOx, thus showed excellent cycling performance as well as rate performance.
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