A Li <sub>3</sub> Bi/LiF interfacial layer enabling highly stable lithium metal anode
Lei Tan, Peng Chen, Qiaoyun Chen, Xing Huang, Kang‐Yu Zou, Yanmei Nie, Lingjun Li
Abstract
Abstract Lithium metal anode is considered the alternative to graphite anode due to its ultra‐high theoretical capacity of 3860 mAh·g −1 . However, serious Li dendrite growth and drastic electrolyte side reactions restrain the commercial application of Li metal anode. In this work, a Li 3 Bi/LiF interfacial layer is constructed on the surface of the Li metal anode by a spontaneous substitution reaction. The composite interfacial layer possesses excellent ionic conductivity, high mechanical strength, and great electrolyte wettability, which ensures fast Li‐ion transfer and uniform Li deposition of the Li 3 Bi/LiF@Li anode. Impressively, the Li 3 Bi/LiF@Li symmetric cell provides a cycle life of more than 400 h with only 73 mV voltage polarization at 10 mA·cm −2 . By pairing with commercial NCM622 cathode, the Li 3 Bi/LiF@Li full cell exhibits a long cycle at a rate of 2 C.