Free‐Standing Nitrogen‐Doped Carbon Nanofiber Films: Integrated Electrodes for Sodium‐Ion Batteries with Ultralong Cycle Life and Superior Rate Capability

The fabrication of large-area free-standing porous nitrogen-doped carbon nanofiber films is reported. The flexible film exhibits a high rate capability and ultralong cycle life used for sodium-ion batteries, due to the presence of abundant pores, high nitrogen-doping level, interconnected conductive network, and excellent structural stability of the electrode. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.