Hierarchically Rambutan-Like Zn3V3O8 Hollow Spheres as Anodes for Lithium-/Potassium-Ion Batteries

Transition metal oxides have wide potential applications in high-performance energy-storage devices. Herein, hierarchically rambutan-like Zn 3 V 3 O 8 (ZVO) hollow spheres are fabricated using a simple reflux/anneal strategy. These hollow spheres are enriched with highly porous features and a favorable surface area, which can afford abundant Li + /K + transport paths, mitigate the volume dilatation, and boost the ion-storage capabilities. As the anodes for lithium-ion batteries, the ZVO electrodes can sustain a high discharge capacity of 1283.7 at 0.2 A g −1 after 50 cycles. Even as the current density reaches 5 A g −1 , the reversible discharge capacity also remains 541 mA h g −1 after 1000 long-term cycles. As the anodes for potassium-ion batteries, ZVO electrodes can afford a discharge specific capacity of 100.1 mA h g −1 at 0.1 A g −1 after 100 cycles. The results demonstrate that hierarchically rambutan-like ZVO hollow spheres can serve as a feasible candidate for Li + /K + storage.