Composition Modulation of Ionic Liquid Hybrid Electrolyte for 5 v Lithium-Ion Batteries

Chia Jung Wu, Purna Chandra Rath, Jagabandhu Patra, Dominic Bresser, Stefano Passerini, Bharath Umesh, Quan Feng Dong, Tai Chou Lee*, Jeng Kuei Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Electrolyte is a key component in high-voltage lithium-ion batteries (LIBs). Bis(trifluoromethanesulfonyl)imide-based ionic liquid (IL)/organic carbonate hybrid electrolytes have been a research focus owing to their excellent balance of safety and ionic conductivity. Nevertheless, corrosion of Al current collectors at high potentials usually happens for this kind of electrolyte. In this study, this long-standing problem is solved via the modulation of the IL/carbonate ratio and LiPF6 concentration in the hybrid electrolyte. The proposed electrolyte suppresses Al dissolution and electrolyte oxidation at 5 V (vs Li+/Li) and thus allows for ideal lithiation/delithiation performance of a high-voltage LiNi0.5Mn1.5O4 (LNMO) cathode even at 55 °C. The underlying mechanism is examined in this work. Excellent cycling stability (97% capacity retention) for an LNMO cathode after 300 cycles is achieved. This electrolyte shows good wettability toward a polyethylene separator and low flammability. In addition, satisfactory compatibility with both graphite and Si-based anodes is confirmed. The proposed electrolyte design strategies have great potential for applications in high-voltage LIBs.

Original languageEnglish
Pages (from-to)42049-42056
Number of pages8
JournalACS Applied Materials and Interfaces
Volume11
Issue number45
DOIs
StatePublished - 13 Nov 2019

Keywords

  • 5 V battery
  • Al corrosion
  • anode compatibility
  • electrolyte design
  • high safety

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