Reduced Graphene Oxide-Supported SrVO Microflowers with Enhanced Electrochemical Performance for Sodium-Ion Batteries.

Sodium-ion batteries (SIBs) have received considerable attention in recent years. Anode material is one of the key factors that determine SIBs' electrochemical performance. Current commercial hard carbon anode shows poor rate performance, which greatly limits applications of SIBs. In this study, a novel vanadium-based material, SrVO, was proposed as an anode for SIBs, and its Na storage properties were studied for the first time. To enhance the electrical conductivity of SrVO material, a microflower structure was designed and reduced graphene oxide (rGO) was introduced as a host to support SrVO microflowers. The microflower structure effectively reduced electron diffusion distance, thus enhancing the electrical conductivity of the SrVO material. The rGO showed excellent flexibility and electrical conductivity, which effectively improved the cycling life and rate performance of the SrVO composite material. As a result, the SrVO@rGO composite showed excellent electrochemical performance (a stable capacity of 273.4 mAh g after 200 cycles at 0.2 A g and a high capacity of 120.4 mAh g at 10.0 A g), indicating that SrVO@rGO composite can be an ideal anode material for SIBs.