Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, 100081, China.
Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China.
Adv Mater. 2018 Nov;30(45):e1804461. doi: 10.1002/adma.201804461. Epub 2018 Sep 27.
Lithium-metal electrodes have undergone a comprehensive renaissance to meet the requirements of high-energy-density batteries due to their lowest electrode potential and the very high theoretical capacity. Unfortunately, the unstable interface between lithium and nonaqueous electrolyte induces dendritic Li and low Coulombic efficiency during repeated Li plating/stripping, which is one of the huge obstacles toward practical lithium-metal batteries. Here, a composite mixed ionic/electronic conductor interphase (MCI) is formed on the surface of Li by in situ chemical reactions of a copper-fluoride-based solution and Li metal at room temperature. The as-obtained MCI film acts like the armor of a soldier to protect the Li-metal anode by its prioritized lithium storage, high ionic conductivity, and high Young's modulus. The armored MCI can effectively suppress Li-dendrite growth and work effectively in LiNi Co Mn O /Li cells. The armored MCI presents fresh insights into the formation and regulation of the stable electrode-electrolyte interface and an effective strategy to protect Li-metal anodes in working Li-metal batteries.
锂金属电极由于其最低的电极电位和极高的理论容量，经过全面复兴，以满足高能密度电池的要求。不幸的是，锂与非水电解质之间不稳定的界面在反复的锂电镀/剥离过程中诱导枝晶锂和低库仑效率，这是实现实用锂金属电池的巨大障碍之一。在这里，通过室温下铜氟化物基溶液与锂金属的原位化学反应，在锂表面形成了一种复合混合离子/电子导体界面（MCI）。所获得的 MCI 膜优先存储锂，具有高离子导电性和高杨氏模量，就像士兵的盔甲一样，可以保护锂金属阳极。铠装 MCI 可以有效地抑制锂枝晶生长，并在 LiNiCoMnOx/Li 电池中有效工作。铠装 MCI 为稳定的电极-电解质界面的形成和调节提供了新的见解，也是保护工作锂金属电池中锂金属阳极的有效策略。
