Synthesis and characterization of GaNb11O29@C for high-performance lithium-ion battery

Abstract

The GaNb11O29 shows an open Wadsley-Roth shear structure, which is of great benefit to store ions in rechargeable batteries. In this work, we successfully synthesize GaNb11O29@C via a simple solid-state reaction method combined with carbon-coating modification. As anode for LIBs, the as-synthesized GaNb11O29@C sample exhibits wonderful electrochemical behaviors. It exhibits high reversible capacity (227.3 mA h g−1), outstanding rate capability (58.91% retention at 700 mA g−1) and excellent long cycle performance (0.036% capacity decay per cycle). The enhancement of diffusion kinetics and rate performance assigns to the increased surface reaction activity and electrical conductivity. The open and stable crystal framework structure guarantees rapid lithium-ion migration, excellent rate performance and long cycle performance. These results tell that GaNb11O29@C is promising anode material for the application in advanced LIBs.