Engineering Solid Electrolyte Interphase in Lithium Metal Batteries by Employing an Ionic Liquid Ether Double-Solvent Electrolyte with Li[(CF3SO2)(n-C4F9SO2)N] as the Salt

Bo Tong, Xi Chen, Liwei Chen, Zhibin Zhou*, Zhangquan Peng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

An ionic liquid ether double-solvent electrolyte, comprising 1 M Li[(CF3SO2)(n-C4F9SO2)N] dissolved in N-propyl-N-methylpiperidinium bis(fluorosulfonyl)imide/1,3-dioxolane (1:1, v/v), is utilized to tackle uncontrollable dendrite growth and unsatisfactory Coulombic efficiency, which are two main barriers for commercial adoption of rechargeable lithium metal batteries. X-ray photoelectron spectroscopy analysis reveals that a highly conductive (Li3N), highly flexible (polydioxolane and F-containing organic compounds) solid electrolyte interphase film formed on the lithium metal anode. In this recipe, Li|Cu cells can operate ca. 1400 cycles with a high average Coulombic efficiency of 98.2% at 10 mA cm-2, and, moreover, Li|LiFePO4 cells can run 1000 cycles with a capacity fading less than 3% at 1 C.

Original languageEnglish
Pages (from-to)4426-4431
Number of pages6
JournalACS Applied Energy Materials
Volume1
Issue number9
DOIs
Publication statusPublished - 24 Sept 2018
Externally publishedYes

Keywords

  • double-solvent electrolyte
  • lithium batteries
  • lithium dendrites
  • lithium metal anode
  • solid electrolyte interphase

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