Tris(pentafluorophenyl) borane as an electrolyte additive for Li-O2 batteries

TPFPB was used as an additive in a rechargeable Li-O2 cell utilizing an electrolyte composed of a solution 1 M LiPF6 in tetraethylene glycol dimethyl ether (TEGDME) to investigate the effects on capacity and cycling performances. Capacity limitation was also applied to the cells and results were compared with full charging and discharging condition. Galvanostatic charge/discharge (GC) measurements were performed in the assembled Li-O2 cells using assembled cells, designed with different electrolytes. Cell discharge capacities were cyclically tested by a battery tester at a constant current in voltage range between 2.15 V–4.25 V. Discharge products of the electrolytes characterized by SEM and XRD techniques. The electrochemical results showed increasing discharge capacity and cycleability of the assembled cells produced with TPFPB as compared to TPFPB free electrolytes.