Mixing ionic liquids and ethylene carbonate as safe electrolytes for lithium-ion batteries

Linh T.M. Le, Thanh D. Vo, Khanh H.P. Ngo, S. Okada, F. Alloin, A. Garg, Phung M.L. Le

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

With aim to design safety and high electrochemical-stability electrolytes, mixtures ionic liquids (ILs) – ethylene carbonate have been prepared and investigated for lithium-ion cell using LiMn2O4 (LMO) and LiFePO4 (LFP) as cathode materials. The addition of 20 vol% ethylene carbonate (EC) could decrease significantly the viscosity as well as improve ionic conductivity and cycling performance of the electrolyte at room temperature. In the electrolyte containing 20 vol% EC, lithium-ion diffusion coefficient is still lower than commercial one based on conventional solvents. However, the stable charge - discharge behavior with N,N‑dimethyl‑N‑ethyl‑N‑propylammonium bis(trifluoromethanesulfonyl) imide (N1123TFSI) based mixtures was achieved up to 120 mAh·g−1 in the first cycle and remaining round 100 mAh·g−1 within 20 cycles without any noticeable capacity loss, and a little bit lower with respect to 1‑ethyl‑3‑methylimidazolium bis(trifluoromethanesulfonul)imide (EMITFSI) and N,N‑dimethyl‑N‑ethyl‑N‑butylammonium bis(trifluoromethanesulfonyl) imide (N1124TFSI). The results also showed that the solvent addition up to 25 vol% maintained homogenous solution and good electrochemical stability of the electrolytes.

Original languageEnglish
Pages (from-to)769-777
Number of pages9
JournalJournal of Molecular Liquids
Volume271
DOIs
Publication statusPublished - Dec 1 2018

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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