Synthesis of Ultrathin GeO2-Reduced Graphene Oxide (RGO) Sheets for a High-Capacity Lithium-Ion Battery Anode.

GeO₂ is a promising high-performance anode material for Li-ion batteries (LIBs) because of its high theoretical reversible capacity, low operation voltage, and high thermal stability. Herein, a simple, cheap, and easily scaled-up synthetic procedure for preparing ultrathin GeO₂-reduced graphene oxide (RGO) sheets is proposed and realized through a freeze-drying method. The as-prepared GeO₂-RGO show non-aggregated graphene sheets and homogeneously dispersed GeO₂ nanoparticles. As a high-performance anode material for LIBs, the composite shows a high specific capacity (1200 mAh g⁻¹ at current density of 100 mA g⁻¹), good cycling performance, and rate capability. [ABSTRACT FROM AUTHOR]