Abstract
Transparent thin film polymer electrolytes were prepared by solvent casting technique with the doping of environmental-friendly ionic liquid, 1-allyl-3-methylimidazolium chloride ([Amim] Cl) into the matrix formed by cellulose acetate (CA) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). The ionic conducting nature of this system improves significantly from the order of 10−7–10−2 S cm−1 upon increasing doping of [Amim] Cl content till a maximum of 4.68 × 10−2 S cm−1 is attained for the composition CA:LiTFSI:[Amim] Cl (14:6:80 wt%). The improving trend in ionic conductivity results from the bond weakening between the connecting atoms in the crystalline region that induces to the increase in amorphous counterpart fractions in the CA matrix. This observation was proved via the accountancies in the reduction of relative viscosity, root mean square value and increase in void as increase in [Amim] Cl doping. The resultant phase conversion hence permits immense lithium ion (Li+) fluidity along the polymer backbone and assisting the improvement in ionic conductivity. The thin film polymer electrolyte is found to be elastic in the presence of crystalline fraction and radically deforms upon the chains diffusion into the amorphous fraction. The linear curvatures of the Arrhenius plot justify the conductivity improvement as via the increasing frequency of Li+ ions hopping as the temperature increases. The increasing addition of [Amim] Cl diminishes both the heat-resistivity and thermal stability of CA:LiTFSI:[Amim] Cl matrix.
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Acknowledgments
This work was supported by the High Impact Research Grant (J-21002-73851) from University of Malaya. The co-author named R. Shanti gratefully acknowledges the “Skim Bright Sparks University Malaya (SBSUM)” for the financial support.
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Ramesh, S., Shanti, R. & Morris, E. Employment of [Amim] Cl in the effort to upgrade the properties of cellulose acetate based polymer electrolytes. Cellulose 20, 1377–1389 (2013). https://doi.org/10.1007/s10570-013-9919-1
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DOI: https://doi.org/10.1007/s10570-013-9919-1