While lithium-oxygen batteries exhibit high theoretical energy densities that by far exceed those of conventional lithium-ion batteries, there are a limited number of examples that actually demonstrate cells with high energy density. The limitation of the positive electrode with a capacity high enough to sustain repeated discharge/charge cycles under high areal capacity conditions hinders the implementation of the lithium-oxygen batteries with practically high energy density. In this study, we develop a carbon black powder-based self-standing membrane, which exhibits a discharge capacity of ~7,000 mAh/g^electrode even under high current density conditions (>0.4 mA/cm²). Using the developed self-standing carbon membrane as the positive electrode, a 500-Wh/kg class rechargeable lithium-oxygen battery was fabricated and a repeated discharge/charge cycle was demonstrated at 0.1 C-rate. The results obtained in this study provide new material research directions to realize high energy density rechargeable lithium-oxygen batteries and facilitate their future development.

虽然锂氧电池的理论能量密度远远超过传统锂离子电池，但实际证明电池具有高能量密度的例子数量有限。正极具有足够高的容量以在高面积容量条件下维持重复放电/充电循环的限制阻碍了具有实际高能量密度的锂氧电池的实施。在这项研究中，我们开发了一个碳黑粉基自立膜，其表现出〜7000毫安/克的放电容量^电极，即使在高电流密度条件下（>0.4毫安/厘米²）。使用开发的自支撑碳膜作为正极，制造了 500-Wh/kg 级可充电锂氧电池，并在 0.1 C 倍率下重复放电/充电循环。本研究的结果为实现高能量密度可充电锂氧电池提供了新的材料研究方向，并促进了其未来的发展。