Prototype Sodium‐Ion Batteries Using an Air‐Stable and Co/Ni‐Free O3‐Layered Metal Oxide Cathode

A prototype rechargeable sodium-ion battery using an O3-Na0.90[Cu0.22Fe0.30Mn0.48]O2 cathode and a hard carbon anode is demonstrated to show an energy density of 210 W h kg−1, a round-trip energy efficiency of 90%, a high rate capability (up to 6C rate), and excellent cycling stability. 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…

• NN
  National Natural Science Foundation of China

  Awards: 51222210, 51421002, 11234013