A Si/Ge nanocomposite prepared by a one-step solid-state metathesis reaction and its enhanced electrochemical performance

Abstract

A Si/Ge nanocomposite composed of interconnected Si and Ge nanoparticles is prepared through a one-step solid-state metathesis reaction between Mg₂Si and GeO₂ for the first time. As an anode, the Si/Ge electrode exhibits a reversible capacity of 2404.7 mA h g⁻¹ at 0.5 A g⁻¹ over 60 cycles and long-term cycling stability with a capacity of 1260 mA h g⁻¹ over 500 cycles even at 5 A g⁻¹.