Polyethylene glycol incorporation on doctor blade and screen printing cast solid polymer electrolyte based PVDF HFP– LiBOB

Abstract

Solid polymer electrolyte (SPE) is considered as one of the most attractive and promising electrolytes that enable to solve a leaking-packaging problem. Nevertheless, this electrolyte still exhibits poor performance and ionic conductivity. The objective of this study is to investigate the effect of PEG incorporation on the ionic conductivity properties and its performance in the battery. The Solid polymer electrolytes (SPEs) were fabricated from poly (vinylidene fluoride)-co-hexafluoropropylene (PVDF HFP), lithium bis(oxalate) borate (LiBOB) and polyethylene glycol (PEG) with a ratio of 72%, 18%, 10%. The slurry was cast by the doctor blade (DB) and screen printing (SP) and dried at 27°C. The SPEs obtained were characterized by Electrochemical Impedance Spectroscopy (EIS), Cyclic Voltammetry (CV), and Scanning Electron Microscope (SEM). The ionic conductivity increased with the addition of 10% PEG for the sample prepared by the DB method, while it decreased in the sample prepared by SP method. The CV result reveals that the SPE cast by SP creates double reduction peaks and all cells still have an irreversible system. The other hand, 10% PEG incorporation, SPEs morphologically appear to decrease particle size on the surface of SPE.