Stabilizing Li/electrolyte interface with a transplantable protective layer based on nanoscale LiF domains

Zhe Peng, Ning Zhao, Zhenggang Zhang, Hao Wan, Huan Lin, Meng Liu, Cai Shen, Haiyong He, Xiangxin Guo, Ji Guang Zhang, Deyu Wang

Research output: Journal PublicationArticlepeer-review

113 Citations (Scopus)

Abstract

Although Li metal has been regarded as one of the most promising anode materials, an unstable Li/electrolyte interface during the cycling process seriously limits its practical application in rechargeable batteries. Herein, we report a transplantable LiF-rich layer (TLL) that can suppress the side reactions between electrolyte and lithium metal. This peelable layer cross-linked by nanoscale LiF domains is obtained by electrochemically reducing NiF2 electrodes and could be used to protect Li metal anodes. Cu-Li cells using the TLL protection can operate for more than 300 cycles with a Coulombic efficiency as high as ~ 98% in carbonate-based electrolytes. In Li-LiFePO4 cells, lithium metal with a TLL still looks shiny after 1000 cycles (~ 6 months) in contrast to the black surface of bare lithium foil after ~ 500 cycles (~ 3 months). These results clearly demonstrate that the TLL could greatly limit the side reactions between lithium metal and the carbonate-based electrolytes, and may enable long-term stable operation of Li metal batteries.

Original languageEnglish
Pages (from-to)662-672
Number of pages11
JournalNano Energy
Volume39
DOIs
Publication statusPublished - Sep 2017
Externally publishedYes

Keywords

  • LiF
  • Lithium metal anode
  • Lithium metal batteries
  • Protective layer
  • SEI

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science (all)
  • Electrical and Electronic Engineering

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