Polymer electrolytes containing guanidinium-based polymeric ionic liquids for rechargeable lithium batteries

摘要

The electrochemical properties of solvent-free, quaternary polymer electrolytes based on a novel polymeric ionic liquid (PIL) as polymer host and incorporating 1 gl 3TFSI ionic liquid, LiTFSl salt and nano-scale silica are reported. The PIL-LiTFSI-1 gl 3TFSI-SiO2 electrolyte membranes are found to be chemically stable even at 80 C in contact with lithium anode and thermally stable up to 320 C. Particularly, the quaternary polymer electrolytes exhibit high lithium ion conductivity at high temperature, wide electrochemical stability window, time-stable interfacial resistance values and good lithium stripping/plating performance. Batteries assembled with the quaternary polymer electrolyte at 80 C are capable to deliver 140mAhg-1 at O.ICrates with very good capacity retention.