Failure analysis of pouch-type Li-O2 batteries with superior energy density

• 来源期刊: 能源化学
• 年，卷（期）: 2020,（6）
• 页码范围: 74-82
• 页数: 9页
• 语种: 英文

摘要

Li-O2 batteries have attracted significant interest in the past decade owing to their superior high specific energy density in contrast to conventional lithium ion batteries.An 8.7-Ah Li-O2 pouch cell with 768.5Whkg-1 was fabricated and characterized in this investigation and the factors that influenced the electrochemical performance of the Li-O2 pouch cell were studied.In contrast to coin/Swagelok-type Li-O2 cells,it was demonstrated that the high-loading air electrode,pulverization of the Li anode,and the large-scale inhomogeneity of the large pouch cell are the major reasons for the failure of Li-O2 batteries with Ah capacities.In addition,safety tests of large Li-O2 pouch cells were conducted for the first time,including nail penetration,crushing,and thermal stability.It was indicated that a self-limiting mechanism is a key safety feature of these batteries,even when shorted.In this study,Li-O2 batteries were investigated in a new size and capacity-scale,which may provide useful insight into the development of practical pouch-type Li-O2 batteries.