Hierarchical
Fe2O3 and SnO2 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 Fe2O3@SnO2@C (FSC) nanotubes were designed and
synthesized by using a template method and Ostwald interaction. The
as-prepared FSC nanotubes can deliver a high capacity of 1659 mA h
g–1 at a current density of 200 mA g–1 and a high reversible capacity of 818 mA h g–1 at 2000 mA g–1 for lithium-ion batteries. Particularly,
a high specific capacity of 1024 mA h g–1 is still
maintained after 100 charging/discharging cycles at 200 mA g–1. Applied in sodium-ion batteries, the multishelled FSC nanotubes
manifest a high specific capacity of 449 mA h g–1 after 180 cycles at 50 mA g–1. Such excellent
performances of the as-fabricated FSC nanotubes may be due to the
unique multishelled tubular structure, porous characteristics, and
high specific surface area. Therefore, the present work provides an
outstanding method to improve the energy storage performance of metal
oxide composites and other types of nanocomposites.
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