Dandelion-Like Bi2S3/rGO hierarchical microspheres as high-performance anodes for potassium-ion and half/full sodium-ion batteries

Sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) have been considered as attractive alternatives for next-generation battery systems, which have promising application potential due to their earth abundance of potassium and sodium, high capacity and suitable working potential, however, the design and application of bi-functional high-performance anode still remain a great challenge up to date. Bismuth sulfide is suitable as anode owing to its unique laminar structure with relatively large interlayer distance to accommodate larger radius ions, high theoretical capacity and high volumetric capacity etc. In this study, dandelion-like Bi2S3/rGO hierarchical microspheres as anode material for PIBs displayed reversible capacity, and 206.91 mAh center dot g(-1) could be remained after 1,200 cycles at a current density of 100 mA center dot g(-1). When applied as anode materials for SIBs, 300 mAh center dot g(-1) could be retained after 300 cycles at 2 A center dot g(-1) and its initial Coulombic efficiency is as high as 97.43%. Even at high current density of 10 A center dot g(-1), 120.3 mAh center dot g(-1) could be preserved after 3,400 cycles. The Na3V2(PO4)(3)@rGO//Bi2S3/rGO sodium ion full cells were successfully assembled which displays stable performance after 60 cycles at 100 mA center dot g(-1). The above results demonstrate that Bi2S3/rGO has application potential as high performance bi-functional anode for PIBs and SIBs.

Automated summary

Sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) are considered as attractive alternatives for next-generation battery systems due to their promising application potential, however, the design and application of bi-functional high-performance anode still remain a great challenge. In this study, dandelion-like Bi2S3/rGO hierarchical microspheres showed reversible capacity as anode material for PIBs and SIBs, demonstrating high performance even at high current densities. The results indicate that Bi2S3/rGO has application potential as a high-performance bi-functional anode for PIBs and SIBs.