The addition of ethylene carbonate to Ionic liquid gel electrolyte for lithium batteries

Abstract

The influence of ethylene carbonate (EC) addition in the lithium salt solution of the ionic liquids based on 1-ethyl-3methyl imidazolium (EMI) and hexyltrimethyl ammonium (HTMA) cations on the electrochemical properties of the gel polymer electrolyte containing the solutions and a polymer matrix with poly(ethylene oxide) side chain has been investigated. The addition of EC improves the conductivity of the gel electrolyte regardless the kind of ionic liquid component. In contrast, the contribution of EC on the interface behavior toward lithium negative electrode is different by the kind of the ionic liquid. The EC addition in the gel electrolyte containing HTMA-based ionic liquid modifies the rate for reversible deposition - dissolution of lithium, while the effect of EC addition in the gel electrolyte containing EMI-based ionic liquid is distinct for the reaction of negative electrode.