Fabrication and characterisation solid polymer electrolyte based polyvinylidene fluoride - lithium bis (oxalato) borate

The aim of this research is to fabricate and investigate the properties of solid polymer electrolyte (SPE). This kind of electrolyte can take place as electrolyte and separator for LIB in order to prevent leakage of its package caused by employing liquid electrolyte. SPE based on Lithium Bis (Oxalato) Borate or LiBOB and Polyvinylidene Fluoride (PVDF) was carried out by simple casting techniques. SPE preparations were performed by varying the ratio of PVDF and LiBOB compositions (90:10, 85:15, 80:20, 75:25) dissolved in DMAC solvents at 50 °C. Characterization of Electrochemical Impedance Spectroscopy is used to observe ionic conductivity of the SPEs, and that of Cyclic Voltammetry is used to investigate the performance of the battery as well. The obtained sheets have a thickness from 40 to 140 μm. Sample having 90:10 ratio of PVDF-LiBOB has the highest ionic conductivity, namely 4,97 × 10⁻⁵ S cm⁻¹. The sample which has good performance is exhibited by the sample D investigated by the existence of oxidation and reduction peaks which reveal the reversible system. (paper)