One-step synthesis of hollow urchin-like Ag2Mn8O16 for long-life Li-O2 battery

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-O-2 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-Mn-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 g(c)(-1) at 100 mA g(c)(-1)), good rate performance (5076 mAh g(c)(-1) at 250 mA g(c)(-1), 64.16%) and long-term cycle stability (320 cycles at 100 mA g(c)(-1) within a limited capacity of 250 mAh g(c)(-1) and 133 cycles at 200 mA g(c)(-1) within a limited capacity of 500 mAh g(c)(-1)). This work provides a positive effect on designing better catalytic cathode materials for LOBs and push forward the commercialization progress. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

In order to address critical issues in nonaqueous Li-O-2 batteries, low-cost, stable, and efficient catalytic cathode materials are crucial. This study presents the fabrication of hollow urchin-like hollandite Ag2Mn8O16 electrocatalyst and demonstrates its superior electrochemical performance in LOBs, potentially accelerating the commercialization process.