Department of Energy Engineering , Hanyang University , 222 Wangsimni-ro , Seongdong-gu, Seoul 04763 , Republic of Korea.
Advanced Batteries Research Center , Korea Electronic Technology Institute , 68 Yatap-dong , Bundang-gu, Seongnam 13509 , Republic of Korea.
ACS Appl Mater Interfaces. 2018 Oct 10;10(40):34699-34705. doi: 10.1021/acsami.8b08731. Epub 2018 Sep 25.
Dendritic growth of a Li metal anode during cycling is one of major issues to be addressed for practical application of Li metal rechargeable batteries. Herein, we demonstrate that surface modification of Li metal with a Na-containing SO electrolyte can be an effective way to prevent dendritic Li growth during cell operation. The surface-modified Li metal anode exhibited no dendritic deposits even under a high areal capacity (5 mA h cm) and a high current density (3 mA cm), whereas the unmodified anode showed typical filamentary Li deposition. The surface-modified Li metal anode also demonstrated significantly enhanced electrochemical performance, which could be attributed to the newly formed Na-containing inorganic surface layer that exhibits uniform and dense properties. Consequently, surface modification with a Na-containing SO inorganic electrolyte is suggested as one of the most effective ways to realize a highly stable Li metal anode with dendrite-free Li deposition for Li metal-based rechargeable batteries.
锂金属负极在循环过程中的枝晶生长是实现实用化锂金属可充电电池需要解决的主要问题之一。在此，我们证明了含有钠离子的 SO 基电解液对锂金属进行表面修饰是一种有效防止电池运行过程中枝晶锂生长的方法。经过表面修饰的锂金属负极即使在高面容量（5 mA h cm）和高电流密度（3 mA cm）下也没有出现枝晶状锂沉积，而未经修饰的负极则显示出典型的丝状锂沉积。经过表面修饰的锂金属负极也表现出显著增强的电化学性能，这归因于新形成的含有钠离子的无机表面层，该表面层具有均匀致密的特性。因此，建议采用含有钠离子的 SO 基无机电解液对锂金属进行表面修饰，这是实现具有无枝晶状锂沉积的高稳定性锂金属负极的最有效方法之一，可用于基于锂金属的可充电电池。
