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.