Operando Fluorescence Detection of Singlet Oxygen in a Li-O2 Battery (O-5AB)

CÓRDOBA, DANIEL; HERNÁN B. RODRÍGUEZ; CALVO, ERNESTO J.

Ciudad Autónoma de Buenos Aires

Simposio; HYCELTEC 2022 - VIII Symposium on Hydrogen, Fuel Cells and Advanced Batteries; 2022

FCEN, UBA

It has been established that the Li-O2 battery with the highest energy density undergoes parasitic reactions with degradation of electrolyte and cathode material, which limits the cycle number due to the formation of very reactive singlet oxygen formed by superoxide disproportionation. We present herein a new operando method for the detection of singlet oxygen during the discharge of an aprotic Li-O2 battery.We have shown for the first time an operando detection of singlet 1O2 during discharge of a Li-O2 battery with a new experimental approach using a bifurcated optical fiber and a Li-O2 battery with an optical window that allowed the inspection of DMA fluorescence decay by formation of non fluorescent endoperoxide with singlet oxygen. The fluorescence decay could be offset by 30 mM sodium azide which physically quenches the singlet oxygen.