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Flexible free-standing hierarchically porous carbon nanofibers embedded with ultrafine (∼3.5 nm) MoO 2 nanoparticles (denoted as MoO 2 @HPCNFs) have been synthesized by electrospinning and subsequent heat treatment. When evaluated as a binder-free anode in Li-ion batteries, the as-obtained MoO 2 @HPCNFs film exhibits excellent capacity retention with high reversible capacity (≥1055 mA h g -1 at 100 mA g -1 ) and good rate capability (425 mA h g -1 at 2000 mA g -1 ), which is much superior to most of the previously reported MoO 2 -based materials. The synergistic effect of uniformly dispersed ultrasmall MoO 2 nanoparticles and a three-dimensionally hierarchical porous conductive network constructed by HPCNFs effectively improve the utilization rate of active materials, enhance the transport of both electrons and Li + ions, facilitate the electrolyte penetration, and promote the Li + storage kinetics and stability, thus leading to a greatly enhanced electrochemical performance.

rsc advances

Ultrafine MoO<sub>2</sub> nanoparticles encapsulated in a hierarchically porous carbon nanofiber film as a high-performance binder-free anode in lithium ion batteries

Ultrafine MoO2 nanoparticles encapsulated in a hierarchically porous carbon nanofiber film as a high-performance binder-free anode in lithium ion batteries

Ultrafine MoO₂ nanoparticles encapsulated in a hierarchically porous carbon nanofiber film as a high-performance binder-free anode in lithium ion batteries