Abstract
To solve the critical issues like high polarization and unstable cycle ability, it is vital to design low-cost, stable and efficient catalytic cathode material for nonaqueous Li-O2 batteries (LOBs). Herein, a hollow urchin-like hollandite Ag2Mn8O16 electrocatalyst is fabricated by one-step hydrothermal method. The mixed bimetallic oxide with diverse valences (Mn3+ and Mn4+) and active oxygen defects provide sufficient active sites, and Ag[sbnd]Mn[sbnd]O bonds accelerate charge transformation. LOBs with the well-designed porous Ag2Mn8O16 cathode show superior electrochemical performances in LOBs, including ultrahigh specific capacity (7912 mAh gc?1 at 100 mA gc?1), good rate performance (5076 mAh gc?1 at 250 mA gc?1, 64.16%) and long-term cycle stability (320 cycles at 100 mA gc?1 within a limited capacity of 250 mAh gc?1 and 133 cycles at 200 mA gc?1 within a limited capacity of 500 mAh gc?1). This work provides a positive effect on designing better catalytic cathode materials for LOBs and push forward the commercialization progress.
NSTL
Elsevier