Journal
CARBOHYDRATE POLYMERS
Volume 91, Issue 1, Pages 14-21Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2012.07.061
Keywords
DES; Ionic conductivity; Complexation; Amorphous region; Li+ mobility
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Funding
- Skim Bright Sparks University Malaya (SBSUM)
- Exploratory Research Grant Scheme [ERGS: ER017-2011A]
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Polymer electrolytes were developed by solution casting technique utilizing the materials of cellulose acetate (CA), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and deep eutectic solvent (DES). The DES is synthesized from the mixture of choline chloride and urea of 1:2 ratios. The increasing DES content well plasticizes the CA:LiTFSI:DES matrix and gradually improves the ionic conductivity and chemical integrity. The highest conducting sample was identified for the composition of CA:LiTFSI:DES (28 wt.%:12 wt.%:60 wt.%), which has the greatest ability to retain the room temperature ionic conductivity over the entire 30 clays of storage time. The changes in FTIR cage peaks upon varying the DES content in CA:LiTFSI:DES prove the complexation. This complexation results in the collapse of CA matrix crystallinity, observed from the reduced intensity of XRD diffraction peaks. The DES-plasticized sample is found to be more heat-stable compared to pure CA. Nevertheless, the addition of DES diminishes the CA:LiTFSI matrix's heat-resistivity but at the minimum addition the thermal stability is enhanced. (C) 2012 Elsevier Ltd. All rights reserved.
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