Figure 1

Electrochemical performances of the Co-doped Li2O cathode.
(a) Charge and discharge voltage curves in repeated charge/discharge cycles at 45 mA g−1. (b) Charge and discharge voltage curves at various current densities (13.5–1080 mA g−1). Each testing cell was charged to 200 mAh g−1 and then discharged to the cut off voltage of 2.0 V at a constant current density.