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Keywords:

  • freeze drying;
  • germanium oxide;
  • graphene oxide;
  • Li-ion batteries;
  • nanomaterials

Abstract

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.