Preparation and characterization of lithium ion conducting ionic liquid-based biodegradable corn starch polymer electrolytes
Thin films of biodegradable corn starch-based biopolymer electrolytes were prepared by solution casting technique. Lithium hexafluorophosphate (LiPF6) and 1-butyl-3-methylimidazolium trifluoromethanesulfonate (BmImTf) were employed as lithium salt and ionic liquid, respectively. With reference to the temperature dependence study, Arrhenius relationship was observed. The highest ionic conductivity of (6.00 ± 0.01) × 10−4 S cm−1 was obtained at 80 °C. Based on x-ray diffraction (XRD) result, the peaks became broader with doping of ionic liquid revealing the higher amorphous region of the biopolymer electrolytes. Ionic liquid-based biopolymer electrolytes exhibited lower glass transition temperature (T g).
KeywordsCorn starch BmImTf XRD DSC
This work was supported by the Fundamental Research Grant Scheme (FRGS) from Ministry of Higher Education, Malaysia (FP009/2010B). One of the authors, Chiam-Wen Liew, gratefully acknowledges the “Skim Bright Sparks Universiti Malaya (SBSUM)” for the financial support.
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