Characterization of solid polymer electrolyte based on cellulose acetate/LiBOB with additive ionic liquid for Li-ion battery

Solid Polymer Electrolyte (SPE) was developed to replace the liquid electrolyte in lithium-ion batteries which has a function as a medium for ion transport. SPE is the result of the synthesis of Cellulose Acetate (CA), Lithium Bis (Oxalate (LIBOB), N, N-dimethylformamide (DMF), and ionic liquid (IL). This study examined the impact of boosting the IL concentration during the production of SPE. Variations in IL 0, 10, and 30%. The membranes were characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS), to study the crystallinity, pore morphology, and conductivity, respectively. According to the results of the XRD study, the increase of IL concentration reduced the size of the crystal grains, the smallest grain size on the membrane with the addition of 30% IL was 876,3 Å and the smallest degree of crystallinity. The results of SEM analysis showed that the pore morphology was abundant on the 30% CA/LIBOB/DMF/IL SPE membrane and spread evenly. The results of EIS analysis showed that the SPE CA/LIBOB/DMF membrane with the addition of 30% IL concentration had the highest conductivity of 2.67 x 10-4 S/cm.