Enhanced Electrochemical Performance Of Peony Flower-Like Carbon-Coated Gamma-Ga2o3 Nanosheets For Lithium-Ion Battery Anodes

Peony flower-like gamma-Ga2O3 nanosheets (gamma-Ga2O3 NSs) were synthesized and carbon layers were coated on their surfaces using a simple hydrothermal process with subsequent carbonization. The gamma-Ga2O3 NSs comprised ultrathin layers, which are tens of nanometers in thickness. The carbon-coated gamma-Ga2O3 NS (gamma-Ga2O3@C NS) electrode exhibited a specific capacity of 598 mAh g(-1) at 200 cycles, at a current density of 0.5 A g(-1), higher than that of gamma-Ga2O3 NSs (60 mAh g(-1)). Furthermore, a specific capacity of 100 mAh g(-1) at 5 A g(-1) was achieved owing to the low charge transfer resistance through the carbon layers. This study suggests that two-dimensional gamma-Ga2O3@C NSs with both large specific area and high charge carrier transport are promising active materials for lithium-ion battery anodes with better electrochemical performance.