Figure 3: Electrochemical performance of Li-SO2 batteries.

(a,b) Discharge rate capability of Li-SO2 cell: (a) with carbonate electrolyte, (b) with ether electrolyte and (c) cycle properties of Li-SO2 cells at 0.2 mA cm−2. (d) Electrochemical profiles of Li-SO2 cells with a soluble catalyst. (e) X-ray diffraction spectra of discharged and recharged gas electrode of Li-SO2 cell with soluble catalyst. (f,g) Electrochemical performance of Li-SO2 cells with soluble catalyst containing carbonate-based electrolyte: (f) power capability of the cells under limited capacity of 0.5 mAh, (g) cyclability of the cell at 1 mA cm−2. (inset: electrochemical profiles during 450 cycles.) The specific capacity was normalized by the mass of carbon loading whose average mass in a gas electrode was ∼0.8±0.1 mg.