Abstract
To realize a more powerful lithium–air battery, it is necessary to clarify and improve the O2 transport phenomena in the cathode. In this study, the effect of dissolved O2 concentration in the electrolyte and precipitates on the cathode performance of a lithium–air battery is investigated. Using a beaker-type cell and micro-bubble generator to dissolve O2, O2 concentration in the electrolyte is varied. Discharge performance is improved by increasing the dissolved O2 concentration in the electrolyte. However, concentration overpotential dominates discharge at high current density. Additionally, precipitate and gas bubbles are observed in the porous cathode. The formation of these discharge products depends on local O2 concentration in the electrolyte. Concentration overpotential is lowered by using an electrolyte flow cell, which decreases transport resistance in the cathode.
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