Long‐lifespan Polyanionic Organic Cathodes for Highly Efficient Organic Sodium‐ion Batteries

An organic Na‐ion battery is reported with a polyanionic 9,10‐anthraquinone‐2,6‐disulfonate (Na2AQ26DS, 130 mAh g−1) cathode and the Na‐intercalated state (Na4TP) of sodium terephthalate (Na2TP, 255 mAh g−1) as the anode. The resulting full cells deliver the maximum discharge capacity of 131 mAh g−1cathode in 0.5–3.2 V, simultaneously maintaining the average value of ≈62 mAh g−1cathode during 1200 cycles (0.5 A g−1, ≈4 C). These results are among the best performing organic sodium‐ion full cells reported to date. Go Organic! A long‐lifespan small‐molecule organic sodium‐ion battery is described. The battery is constructed using a 9,10‐anthraquinone‐2,6‐disulfonate (Na2AQ26DS) cathode and sodium terephthalate (Na2TP) anode, and delivers a maximum discharge capacity of 131 mAh g−1cathode in 0.5–3.2 V, maintaining an average value of approximately 62 mAh g−1cathode over 1200 cycles (0.5 A g−1, ≈4 C).