Stable Anion-Derived Solid Electrolyte Interphase in Lithium Metal Batteries

Tao Li, Xue Qiang Zhang, Nan Yao, Yu Xing Yao, Li Peng Hou, Xiang Chen, Ming Yue Zhou, Jia Qi Huang, Qiang Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

167 Citations (Scopus)

Abstract

High-energy-density lithium (Li) metal batteries are severely hindered by the dendritic Li deposition dictated by non-uniform solid electrolyte interphase (SEI). Despite its unique advantages in improving the uniformity of Li deposition, the current anion-derived SEI is unsatisfactory under practical conditions. Herein regulating the electrolyte structure of anions by anion receptors was proposed to construct stable anion-derived SEI. Tris(pentafluorophenyl)borane (TPFPB) anion acceptors with electron-deficient boron atoms interact with bis(fluorosulfonyl)imide anions (FSI) and decrease the reduction stability of FSI. Furthermore, the type of aggregate cluster of FSI in electrolyte changes, FSI interacting with more Li ions in the presence of TPFPB. Therefore, the decomposition of FSI to form Li2S is promoted, improving the stability of anion-derived SEI. In working Li | LiNi0.5Co0.2Mn0.3O2 batteries under practical conditions, the anion-derived SEI with TPFPB undergoes 194 cycles compared with 98 cycles of routine anion-derived SEI. This work inspires a fresh ground to construct stable anion-derived SEI by manipulating the electrolyte structure of anions.

Original languageEnglish
Pages (from-to)22683-22687
Number of pages5
JournalAngewandte Chemie - International Edition
Volume60
Issue number42
DOIs
Publication statusPublished - 11 Oct 2021

Keywords

  • anion receptor
  • anion-derived solid electrolyte interphase
  • electrolyte structure
  • lithium metal batteries
  • tris(pentafluorophenyl) borane

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