An All-Organic battery with 2.8 V output voltage

• Silver terephthalate possesses significantly higher charge transfer and ion transport kinetics than sodium terephthalate. • Anthraquinone groups facilitate the molecular-level π-π stacking of PTMA with MWCNT, thereby enhancing redox kinetics. • Full organic battery with PTMA cathode and terephthalate anode provides a 2.8 V cell voltage. • All-organic battery delivers the specific capacity of 43 mAh g −1 based on both anode and cathode active materials. Fully organic batteries have been recognised as ideal alternatives to traditional metal-based energy storage devices. However, significant challenges remain in mitigating their low cell voltage and capacity. Here, we construct an all-organic battery based on TEMPO (i.e., 2,2,6,6-tetramethylpiperidyl-1-oxy) radical polymer cathode, poly(TEMPO methacrylate) (PTMA), and conjugated dicarboxylate anode such as silver terephthalate (Ag 2 TP). Chemical modification of PTMA with aromatic anthraquinone (AQ) results in P(TMA 0.95 -co-AQ 0.05 ) 1610 , in which AQ groups facilitate the molecular level binding to CNTs through non-covalent π-π interaction and enhance the charge and mass transport. This fully organic battery delivers a capacity of 182 mAh g −1 based on the anode at 0.5C with an output voltage of 2.8 V. Although the capacity needs further improvement, our work shows the promise of developing high-voltage, fully organic batteries with a judicious electrode design.