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

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

Research output: Journal PublicationArticlepeer-review

8 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)21179-21186
Number of pages8
JournalACS Applied Materials and Interfaces
Volume15
Issue number17
DOIs
Publication statusPublished - 3 May 2023

Keywords

  • LiAlO
  • LiGePS
  • all-solid-state batteries
  • interface modification
  • lithium negative electrode
  • magnetic sputtering

ASJC Scopus subject areas

  • General Materials Science

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