context: Anthraquinone-1,5-disulfonic acid disodium salt (1,5-AQDS, 1a) was first proposed for potassium batteries by Xu et al. In a carbonate-based electrolyte, the authors achieved the reversible capacity per material mass (Qm) of 95 mA h g−1 at 0.1C (13 mA g−1), and after a hundred cycles the capacity was 78 mA h g−1.
answer: carbonate-based