Naked metallic skin for homo-epitaxial deposition in lithium metal batteries

Minsung Baek, Jinyoung Kim, Kwanghoon Jeong, Seonmo Yang, Heejin Kim, Jimin Lee, Minkwan Kim, Ki Jae Kim () and Jang Wook Choi ()
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Minsung Baek: Seoul National University
Jinyoung Kim: Seoul National University
Kwanghoon Jeong: Seoul National University
Seonmo Yang: Seoul National University
Heejin Kim: Korea Basic Science Institute
Jimin Lee: Seoul National University
Minkwan Kim: Seoul National University
Ki Jae Kim: Konkuk University
Jang Wook Choi: Seoul National University

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Regulating the morphology of lithium plating is the key to extending the cycle life of lithium metal batteries. Fatal dendritic growth is closely related to out-of-plane nucleation on the lithium metal surface. Herein, we report a nearly perfect lattice match between the lithium metal foil and lithium deposits by removing the native oxide layer using simple bromine-based acid-base chemistry. The naked lithium surface induces homo-epitaxial lithium plating with columnar morphologies and lower overpotentials. Using the naked lithium foil, the lithium-lithium symmetric cell maintains stable cycling at 10 mA cm−2 for more than 10,000 cycles, and the full-cell paired with LiFePO4 with high areal capacity of 3.3 mAh cm−2 and practical N/P ratio of 2.5 exhibits 86% capacity retention after 300 cycles. This study elucidates the usefulness of controlling the initial surface state to facilitate homo-epitaxial lithium plating for sustainable cycling of lithium metal batteries.

Date: 2023
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DOI: 10.1038/s41467-023-36934-x

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