Discharging temperature dependence of Li2O2 formation and its effect on charging polarization for Li–O2 Battery

• Varied morphologic Li2O2 were produced firstly by changing discharge temperature.
• The particle size of Li2O2 obtained at higher temperature is finer.
• Charging polarization of Li–O2 battery is lower with the finer Li2O2.

Among all the factors that restrict the application of Li–air battery, large charging polarization, due to the poor bulk charge transport ability of discharge product Li2O2, comes first. In this paper, we adopt the method of controlling discharging temperature to reduce the charging polarization during the first cycle of Li2O2 based on the fact that controlling discharging temperature can reduce Li2O2 bulk charge transport path since finer Li2O2 particles can be observed at higher temperature. The mechanism of reducing charging polarization simply through increasing the discharging test temperature has also been researched in this paper.

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