FeSe 2 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…