Issue 13, 2024

A “flotation” strategy for tailoring the solid electrolyte interphase on 3D composite Li anodes

Abstract

In the realm of Li metal batteries, the deployment of three-dimensional (3D) composite Li metal anodes has emerged as a significant strategy for mitigating dendrite growth. However, the inadequate Li-atom affinity of 3D hosts and the heterogeneous solid electrolyte interphase (SEI) layer on 3D composite Li anodes lead to unsatisfactory electrochemical performance. A promising strategy to curtail dendrite growth is to construct a 3D composite Li anode with a lithophilic 3D structure and a tailored SEI. Herein, we develop a novel “flotation” strategy to construct these 3D composite Li metal anodes through a simple one-step method. During the molten Li injection process, lithophilic ZnO directs molten Li into the host, whereas ZnF2, ZnPxx, or ZnS reacts with Li to form relatively less lithophilic LiF, Li3P, or Li2S which “floats” to the surface to participate in the formation of a LiF-, Li3P-, or Li2S-rich SEI on the anodes. These anodes demonstrate a lithophilic 3D structure and a robust SEI, thereby stabilizing the anode–electrolyte interface. Consequently, these anodes demonstrate excellent stability with enhanced interface kinetics. When integrated into full cells with LiFePO4 (LFP) cathodes, these anodes exhibit superior electrochemical performance. These findings underscore the efficacy of this strategy in achieving dendrite-free anodes, paving the way for their application in high-energy-density devices.

Graphical abstract: A “flotation” strategy for tailoring the solid electrolyte interphase on 3D composite Li anodes

Supplementary files

Article information

Article type
Research Article
Submitted
11 Mar 2024
Accepted
14 May 2024
First published
15 May 2024

Inorg. Chem. Front., 2024,11, 3765-3776

A “flotation” strategy for tailoring the solid electrolyte interphase on 3D composite Li anodes

P. Li, J. Han, K. Chen, L. Xiao, Q. Xu and J. Xu, Inorg. Chem. Front., 2024, 11, 3765 DOI: 10.1039/D4QI00632A

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