RESUMEN
A proof-of-concept study was conducted on an all-solid-state rechargeable air battery (SSAB) using redox-active 2,5-dihydroxy-1,4-benzoquinone (DHBQ) and its polymer (PDBM) and a proton-conductive polymer (Nafion). DHBQ functioned well in the redox reaction with the solid Nafion ionomer at 0.47 and 0.57â V vs. RHE, similar to that in acid aqueous solution. The resulting air battery exhibited an open circuit voltage of 0.80â V and a discharge capacity of 29.7â mAh gDHBQ -1 at a constant current density (1â mA cm-2 ). With PDBM, the discharge capacity was much higher, 176.1â mAh gPDBM -1 , because of the improved utilization of the redox-active moieties. In the rate characteristics of the SSAB-PDBM, the coulombic efficiency was 84 % at 4â C, which decreased to 66 % at 101â C. In a charge/discharge cycle test, the capacity remaining after 30â cycles was 44 %, which was able to be significantly improved, to 78 %, by tuning the Nafion composition in the negative electrode.