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

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.