Issue 5, 2023

An in situ LiF-enriched solid electrolyte interphase from CoF2-decorated N-doped carbon for dendrite-free Li metal anodes

Abstract

Lithium (Li) metal has shown great potential as the anode for high-energy-density rechargeable batteries due to its ultrahigh theoretical specific capacity and low redox potential. However, the practical application of the Li metal anode is inherently limited by the uncontrollable Li dendrite growth and unstable solid electrolyte interphase (SEI) layer. Herein, a CoF2-decorated N-doped carbon (denoted as CoF2@NC) is synthesized by a convenient fluoridation treatment after the carbonization of ZIF-67 precursor and used as a functional coating on the bare Cu current collector for enabling uniform Li deposition. Due to the lithiophilic properties of the CoF2@NC matrix and the as-generated LiF-enriched SEI layer, the CoF2@NC-modified current collector demonstrates decreased nucleation potential and a more stable Li stripping/plating process. As a result, the symmetric cell with a Li@CoF2@NC/Cu electrode exhibits substantially enhanced cycling stability for 1200 h under the conditions of 1 mA cm−2 and 1 mA h cm−2. Moreover, the assembled LiFePO4 full cell with a Li@CoF2@NC/Cu anode delivers excellent rate performance and cycling stability, endowing high initial discharge capacity (149.3 mA h g−1) and capacity retention (95.45%) after 500 cycles at 1C. This work emphasizes that the synergistic effect of the lithiophilic substrate and robust SEI layer is essential for high-performance Li metal batteries.

Graphical abstract: An in situ LiF-enriched solid electrolyte interphase from CoF2-decorated N-doped carbon for dendrite-free Li metal anodes

Supplementary files

Article information

Article type
Paper
Submitted
18 Janv. 2023
Accepted
23 Marts 2023
First published
29 Marts 2023
This article is Open Access
Creative Commons BY-NC license

Energy Adv., 2023,2, 725-732

An in situ LiF-enriched solid electrolyte interphase from CoF2-decorated N-doped carbon for dendrite-free Li metal anodes

X. Jin, G. Huang, X. Zhao, G. Chen, M. Guan and Y. Li, Energy Adv., 2023, 2, 725 DOI: 10.1039/D3YA00035D

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