FeSe2 Microspheres as a High‐Performance Anode Material for Na‐Ion Batteries

FeSe2 microspheres assembled by nano­octahedra are used as an anode material for Na-ion batteries for the first time, showing a high discharge capacity (447 mA h g−1 at 0.1 A g−1), excellent rate performance (388 mA h g−1 at 5 A g−1 and 226 mA h g−1 at 25 A g−1), and long cycling stability (372 mA h g−1 after 2000 cycles at 1 A g−1). 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.