Li/LiFePO 4 battery performance with a guanidinium-based ionic liquid as the electrolyte

Abstract

A new guanidinium-based ionic liquid (IL) was investigated as a novel electrolyte for a lithium rechargeable battery. The viscosity, conductivity, lithium redox behavior, and charge-discharge characteristics of the lithium rechargeable batteries were investigated for the IL electrolyte with 0.3 mol kg -1 lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt. Li/LiFePO 4 cells incorporating the IL electrolyte without additives showed good cycle properties at a charge-discharge current rate of 0.1 C, and exhibited good rate capabilities in the presence of a mass fraction of 10% vinylene carbonate or gamma-butyrolactone. © 2011 Science China Press and Springer-Verlag Berlin Heidelberg.