Rational Design and Controllable Synthesis of Multishelled FeO@SnO@C Nanotubes as Advanced Anode Material for Lithium-/Sodium-Ion Batteries.

Hierarchical FeO and SnO nanostructures have shown great potential for applications in high-performance ion batteries because of their superiority, including wide resources, facile preparation, environmental friendliness, and high energy density. However, some severe challenges, such as rapid capacity decay due to volume expansion upon cycling and poor conductivity, limit their rate performance. To address this issue, multishelled FeO@SnO@C (FSC) nanotubes were designed and synthesized by using a template method and Ostwald interaction.