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LiAlO2-Modified Li Negative Electrode with Li10GeP2S12 Electrolytes for Stable All-Solid-State Lithium Batteries

Chang, Xinshuang; Weng, Wei; Li, Mengqi; Wu, Ming; Chen, George Z.; Fow, Kam Loon; Yao, Xiayin

LiAlO2-Modified Li Negative Electrode with Li10GeP2S12 Electrolytes for Stable All-Solid-State Lithium Batteries Thumbnail


Authors

Xinshuang Chang

Wei Weng

Mengqi Li

Ming Wu

Kam Loon Fow

Xiayin Yao



Abstract

Lithium (Li) metal has an ultrahigh specific capacity in theory with an extremely negative potential (versus hydrogen), receiving extensive attention as a negative electrode material in batteries. However, the formation of Li dendrites and unstable interfaces due to the direct Li metal reaction with solid sulfide-based electrolytes hinders the application of lithium metal in all-solid-state batteries. In this work, we report the successful fabrication of a LiAlO2 interfacial layer on a Li/Li10GeP2S12 interface through magnetic sputtering. As LiAlO2 can be a good Li+ ion conductor but an electronic insulator, the LiAlO2 interface layer can effectively suppress Li dendrite growth and the severe interface reaction between Li and Li10GeP2S12. The Li@LiAlO2 200 nm/Li10GeP2S12/Li@LiAlO2 200 nm symmetric cell can remain stable for 3000 h at 0.1 mA cm-2 under 0.1 mAh cm-2. Moreover, unlike the rapid capacity decay of a cell with a pristine lithium negative electrode, the Li@LiAlO2 200 nm/Li10GeP2S12/LiCoO2@LiNbO3 cell delivers a reversible capacity of 118 mAh g-1 and a high energy efficiency of 96.6% after 50 cycles. Even at 1.0 C, the cell with the Li@LiAlO2 200 nm electrode can retain 95% of its initial capacity after 800 cycles.

Journal Article Type Article
Acceptance Date Apr 6, 2023
Online Publication Date Apr 17, 2023
Publication Date May 3, 2023
Deposit Date May 4, 2023
Publicly Available Date Apr 18, 2024
Journal ACS Applied Materials and Interfaces
Print ISSN 1944-8244
Electronic ISSN 1944-8252
Publisher American Chemical Society (ACS)
Peer Reviewed Peer Reviewed
Volume 15
Issue 17
Pages 21179–21186
DOI https://doi.org/10.1021/acsami.3c03242
Keywords all-solid-state batteries, interface modification, magnetic sputtering, lithium negative electrode, LiAlO2, Li10GeP2S12
Public URL https://nottingham-repository.worktribe.com/output/19789037
Publisher URL https://pubs.acs.org/doi/10.1021/acsami.3c03242

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