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The graphite//5,7,12,14-pentacenetetrone organic dual-ion batteries display two well-defined discharge plateaus at 2.4 and 1.8 V, and a high capacity retention of 92.2% after 100 cycles.

Dual‐ion batteries with pure ionic liquid electrolyte (IL‐DIBs) have received increasing interest due to their sustainability, high operating voltage, and environmental friendliness. However, owing to the insertion/extraction of large‐size ionic liquid cations, the conventional IL‐DIBs with a graphite anode suffer from severe volume expansion and graphite exfoliation on the anode, causing a poor cycling performance. Herein, a novel IL‐DIB is constructed by introducing a bulk organic material (coronene) as the anode, against a natural graphite cathode. The results show that, in a voltage window range from 1.0 to 4.4 V, the battery has a high discharge specific capacity of ≈73.3 mA h g−1 and exhibits a good cycling performance for 450 cycles with a lower capacity loss of 0.061 mA h g−1 per cycle at a current density of 300 mA g−1 (3 C). Notably, it still maintains a considerable capacity of ≈55.8 mA h g−1 at a high rate of 10 C. In addition, the reversible intercalation/de‐intercalation of the Pyr14+ cations into/from the coronene anode is investigated by ex situ X‐ray diffraction and Fourier transform infrared spectroscopy, showing an excellent structure stability of the coronene crystal during the charge–discharge process.

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Owing to the high theoretical capacity, sustainability, and flexible structure, organic electrode materials have been considered as a promising option for rechargeable batteries. Hence, an organic polymer molecule, poly(anthraquinonyl sulfide) (PAQS), is introduced as the anode material for a pure ionic liquid dual-ion battery (IL-DIB). Interestingly, the battery shows excellent rate performance; even at 120 C, the capacity could reach 41.9 mA h g −1 , and a maximum discharged capacity of 101.0 mA h g −1 is obtained at a rate of 10 C. Moreover, the properties of the battery that is charged at a high rate (40 C) and discharged at a low rate (2 C) are tested, revealing a considerable capacity (51.7 mA h g −1 ) and high energy efficiency (over 97%). In addition, scanning electron microscopy (SEM) and X-ray diffraction (XRD) characterization demonstrate that both the KS6 cathode and the PAQS anode remain in their original structure well after 300 cycles. Consequently, the KS6/PAQS IL-DIB shows great potential as a supercharged energy storage device for electric vehicles, mobile phones, and laptops.