Affiliation:
1. Clean Energy research Center Fuel Cell Nanomaterials Center University of Yamanashi 4 Takeda Kofu Yamanashi 400-8510 Japan
2. Department of Applied Chemistry Research Institute for Science and Engineering Waseda University Tokyo 169-8555 Japan
3. Current address: Center for Future Innovation (CFI) and Department of Applied Chemistry Graduate School of Engineering Osaka University Osaka 565-0871 Japan
Abstract
AbstractA 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 0.57 V vs. RHE, similar to that in acid aqueous solution. The resulting air battery exhibited an open circuit voltage of 0.80 V and a discharge capacity of 29.7 mAh gDHBQ−1 at a constant current density (1 mA cm−2). With PDBM, the discharge capacity was much higher, 176.1 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 4 C, which decreased to 66 % at 101 C. In a charge/discharge cycle test, the capacity remaining after 30 cycles was 44 %, which was able to be significantly improved, to 78 %, by tuning the Nafion composition in the negative electrode.
Funder
Japan Society for the Promotion of Science London
Ministry of Education, Culture, Sports, Science and Technology
JKA Foundation