Carbon-free high-performance cathode for solid-state Li-O 2 battery

作者：Mokwon Kim, Hyunpyo Lee, Hyuk Jae Kwon, Seong‐Min Bak, Cherno Jaye, Daniel Alvarez Fischer, Gabin Yoon, Jung Ock Park, Dong‐Hwa Seo, Sang Bok, Dongmin Im · 发表于：Science Advances · 年份：2022 · DOI：10.1126/sciadv.abm8584 · 被引用次数：38 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Advanced battery technologies research

The development of a cathode for solid-state lithium-oxygen batteries has been hindered in practice by a low capacity and limited cycle life despite their potential for high energy density. Here, a previously unexplored strategy is proposed wherein the cathode delivers a specific capacity of 200 milliampere hour per gram over 665 discharge/charge cycles, while existing cathodes achieve only ~50 milliampere hour per gram and ~100 cycles. A highly conductive ruthenium-based composite is designed as a carbon-free cathode by first-principles calculations to avoid the degradation associated with carbonaceous materials, implying an improvement in stability during the electrochemical cycling. In addition, water vapor is added into the main oxygen gas as an additive to change the discharge product from growth-restricted lithium peroxide to easily grown lithium hydroxide, resulting in a notable increase in capacity. Thus, the proposed strategy is effective for developing reversible solid-state lithium-oxygen batteries with high energy density.