(569c) Characterization of Electrochemical Processes Occurring in Nonaqueous Li-O2 Batteries

Li-air batteries have received significant attention as a potential high specific energy alternative to current state-of-the-art rechargeable Li-ion batteries.  However, numerous scientific challenges remain unsolved in the pursuit of attaining a high capacity, coulombically efficient Li-air battery.  This presentation will highlight IBM’s current efforts to understand the nature of Li-O₂ electrochemistry, with the main goal of improving Li-air battery cyclability and capacity. 

Among the many important challenges facing the development of Li-air batteries, our research has focused on processes occurring at the porous carbon cathode.  Quantitative Differential Electrochemical Mass Spectrometry (DEMS) and electrochemical measurements on flat, nonporous glassy carbon electrodes were coupled with ex-situ chemical analysis of electrodes to better understand factors that control, and hinder, the desired rechargeable cathodic reaction, the formation of solid lithium peroxide (i.e., Li⁺ + O₂ + 2e^- → Li₂O₂).  As a result, this presentation will particularly emphasize studies to elucidate Li₂O₂ electronic conductivity and Li₂O₂’s effect on solvent and cathode stability.