A Self-Recoverable LiTi₂(PO₄)₃/O₂ Hybrid Cathode for Lithium- Oxygen Batteries with High Power Performance

摘要

Despite the potential of delivering desirably high energy, the wide application of lithium-oxygenbatteries (LOBs) is severely restricted by its poor power performance. In this study, a LiTi 2 (PO 4 ) 3 /O 2hybrid cathode was constructed, in which the carbon-coated LiTi 2 (PO 4 ) 3 was prepared by a sol-gelmethod. Comparing to conventional LOB cathode, the LiTi 2 (PO 4 ) 3 /O 2 hybrid cathode (LOHC) exhibitedconsiderable power density as high as 5.5 mW·cm -2 (more than 4 times of LOB cathode power density)at high currents up to 4 mA·cm -2 while retaining high-energy delivery at low currents. It also showedthe ability of self-recovery to charged-state in the environment of oxygen (the capacity recoverypercentage stayed around 80% in each resting process), which improved the high-power outputdurability. This work may provide a new approach to promote the development of lithium-oxygenbatteries.