Identification of LiH and nanocrystalline LiF in the solid–electrolyte interphase of lithium metal anodes

Zulipiya Shadike, Hongkyung Lee, Oleg Borodin, Xia Cao, Xiulin Fan, Xuelong Wang, Ruoqian Lin, Seong Min Bak, Sanjit Ghose, Kang Xu, Chunsheng Wang, Jun Liu, Jie Xiao, Xiao Qing Yang, Enyuan Hu

Research output: Contribution to journalArticlepeer-review

145 Citations (Scopus)

Abstract

A comprehensive understanding of the solid–electrolyte interphase (SEI) composition is crucial to developing high-energy batteries based on lithium metal anodes. A particularly contentious issue concerns the presence of LiH in the SEI. Here we report on the use of synchrotron-based X-ray diffraction and pair distribution function analysis to identify and differentiate two elusive components, LiH and LiF, in the SEI of lithium metal anodes. LiH is identified as a component of the SEI in high abundance, and the possibility of its misidentification as LiF in the literature is discussed. LiF in the SEI is found to have different structural features from LiF in the bulk phase, including a larger lattice parameter and a smaller grain size (<3 nm). These characteristics favour Li+ transport and explain why an ionic insulator, like LiF, has been found to be a favoured component for the SEI. Finally, pair distribution function analysis reveals key amorphous components in the SEI.

Original languageEnglish
Pages (from-to)549-554
Number of pages6
JournalNature Nanotechnology
Volume16
Issue number5
DOIs
Publication statusPublished - 2021 May

Bibliographical note

Publisher Copyright:
© 2021, The Author(s), under exclusive licence to Springer Nature Limited.

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering
  • General Materials Science
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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