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

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.

Citation

Chang, X., Weng, W., Li, M., Wu, M., Chen, G. Z., Fow, K. L., & Yao, X. (2023). LiAlO2-Modified Li Negative Electrode with Li10GeP2S12 Electrolytes for Stable All-Solid-State Lithium Batteries. ACS Applied Materials and Interfaces, 15(17), 21179–21186. https://doi.org/10.1021/acsami.3c03242

• 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
• 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