Hard Carbon Microspheres: Potassium‐Ion Anode Versus Sodium‐Ion Anode

Hard carbon microspheres (HCS) exhibit a highly reversible capacity of 262 mAh g−1 for K-ion batteries. They present a superior rate capability for K-ions to Na-ions, where at 2C, HCS/K cells deliver 190 mAh g−1 in contrast to 97 mAh g−1 from HCS/Na cells. It is determined that the K-ion diffusion coefficient of HCS is higher than that of Na-ions. 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.