One‐Step In Situ Synthesis of GeO2/Graphene Composites Anode for High‐Performance Li‐Ion Batteries

GeO2/graphene composites are synthesized for the first time. Characterizations reveal the homogeneous dispersion of GeO2 nanoparticles (40–100 nm) on the non-aggregated graphene nanosheets. As anode material for Li ion batteries, the composites exhibit remarkably high reversible capacity (1110.6 mAh g−1), excellent cycling stability (90.0% after 50 cycles), and superior rate capability (≈540 mAh g−1 at 3 A g−1).