▎ 摘　　要

Balancing gravimetric and volumetric performances of an electrode has a great guiding significance for a practical Na+ storage application, which still remains a challenge. Herein, an investigation of commercial graphene nanosheets coupled with microsized Bi particles as the anode for Na+ storage was performed, regarding the gravimetric and volumetric performances, as well as the functions of graphene itself. As the graphene nanosheets fraction increased, the conductive manner changed significantly, accelerating the electron transport and leading to fast Na+ storage kinetics. The maximum gravimetric specific capacity reaches 108 mAh g(-1) at an extremely high current density of 111 A g(-1). This superior gravimetric rate performance can be delivered without any ingenious nanostructure designs of the electrode, demonstrating great functional improvement of the graphene nanosheets. The volumetric rate performances depend on additional fractions of graphene and the specific requirement of the application condition. The maintained network structure of the graphene nanosheets within the electrode ensures a stable electron/charge diffusion and transport pathway, as well as a mechanical buffer of huge volume variation. Besides this, graphene itself also accommodates a reversible Na+ storage. These results can guide the Bi/graphene anode toward a practical application of Na+ storage considering gravimetric and volumetric performances.