A Low‐Cost Na‐Ion and K‐Ion Batteries Using a Common Organic Cathode and Bismuth Anode

Abstract Molecule‐aggregation organic electrodes in principle have the capability for “single‐molecule‐energy‐storage” in metal‐ion rechargeable batteries, which indicates that the same organic electrode can be simultaneously applied to multiple metal‐ion rechargeable batteries. In this study, the polyanionic organic compound 9,10‐anthraquinone‐2,6‐disulfonate (Na 2 AQ26DS, 130 mAh g −1 ) is used as a common cathode and metal bismuth (Bi) as a common anode to simultaneously assemble low‐cost Na‐ion and K‐ion full cells. The Na‐ion full cells can deliver the peak discharge capacity of 139 mAh g −1 cathode at 0.5–3.0 V, and the K‐ion full cells can show the peak discharge capacity of 130 mAh g −1 cathode at 0.5–3.0 V. These results are comparable to the best organic‐based Na‐ion and K‐ion full cells reported to date.