Deep-Eutectic-Solvent-Based Self-Healing Polymer Electrolyte for Safe and Long-Life Lithium-Metal Batteries

Pauline Jaumaux, Qi Liu, Dong Zhou*, Xiaofu Xu, Tianyi Wang, Yizhou Wang, Feiyu Kang, Baohua Li, Guoxiu Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

301 Scopus citations

Abstract

The deployment of high-energy-density lithium-metal batteries has been greatly impeded by Li dendrite growth and safety concerns originating from flammable liquid electrolytes. Herein, we report a stable quasi-solid-state Li metal battery with a deep eutectic solvent (DES)-based self-healing polymer (DSP) electrolyte. This electrolyte was fabricated in a facile manner by in situ copolymerization of 2-(3-(6-methyl-4-oxo-1,4-dihydropyrimidin-2-yl)ureido)ethyl methacrylate (UPyMA) and pentaerythritol tetraacrylate (PETEA) monomers in a DES-based electrolyte containing fluoroethylene carbonate (FEC) as an additive. The well-designed DSP electrolyte simultaneously possesses non-flammability, high ionic conductivity and electrochemical stability, and dendrite-free Li plating. When applied in Li metal batteries with a LiMn2O4 cathode, the DSP electrolyte effectively suppressed manganese dissolution from the cathode and enabled high-capacity and a long lifespan at room and elevated temperatures.

Original languageEnglish (US)
Pages (from-to)9134-9142
Number of pages9
JournalAngewandte Chemie - International Edition
Volume59
Issue number23
DOIs
StatePublished - Jun 2 2020

Keywords

  • deep eutectic solvents
  • dendrite growth
  • lithium-metal batteries
  • polymer electrolytes
  • self-healing

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry

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