Large-Scale Li-O2 Pouch Type Cells for Practical Evaluation and Applications

Abstract

Due to their high theoretical specific capacity and energy density, LiO2 batteries are considered as candidates for next-generation battery systems in place of conventional Li-ion batteries for advanced applications such as electric vehicles. However, low energy efficiency, poor cycle life, and Li-metal safety issues make the use of LiO2 batteries yet impractical. In addition, actual cell capacities are very low, and since only small-scale electrodes are currently tested, it is hard to predict the properties of large-size electrodes and cells, thus evaluating and judging real practical challenges related to this battery technology. In this work, the behavior of pouch-type LiO2 cells using 3 × 5 cm2 sized electrodes is investigated and it is confirmed that Li-metal is a key issue for the upscale of LiO2 cells. This study can help to determine which parameters are the most important for developing practical LiO2 batteries.