A Li3Bi/LiF interfacial layer enabling highly stable lithium metal anode

• Published in: Rare metals Vol. 42; no. 12; pp. 4081 - 4090
• Main Authors: Tan, Lei, Chen, Peng, Chen, Qiao-Yun, Huang, Xing, Zou, Kang-Yu, Nie, Yan-Mei, Li, Ling-Jun
• Format: Journal Article
• Language: English
• Published: Beijing Nonferrous Metals Society of China 01.12.2023; Springer Nature B.V
• Subjects: Biomaterials; Chemistry and Materials Science; Electrode polarization; Energy; Ion currents; Lithium fluoride; Lithium ions; Materials Engineering; Materials Science; Metallic Materials; Nanoscale Science and Technology; Original Article; Physical Chemistry; Substitution reactions; Wettability; LiF interfacial layer; High current density; Li; Lithium metal anode; Dendrite-free; Bi
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-023-02416-8

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. Graphical Abstract