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Effect of anion of lithium salt on the property of lithium salt-epoxidized natural rubber polymer electrolytes

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Abstract

Lithium salt, LiX (where X = BF −4 , I−, CF3SO −3 , COOCF −3 or ClO −4 ), was incorporated into epoxidized natural rubber (ENR). Thin films of LiX-ENR polymer electrolytes (PEs) were obtained via solvent casting method. These electrolytes were characterized using SEM/X-mapping, FTIR, differential scanning calorimeter, thermogravimetry analysis, and impedance spectroscopy. The trend in thermal stability and ionic conductivity of LiX-ENR PEs follow LiBF4 > > LiCF3SO3 ~ LiCOOCF3 > LiI > > LiClO4. The LiClO4 hardly dissociates and formed LiClO4 aggregates within the polymer matrix that resulted in a PE with low thermal stability and low ionic conductivity. The LiCF3SO3, LiCOOCF3, and LiI, however, exert moderate interactions with the ENR, and their respective PEs exhibit moderate ionic conductivity and thermal property. The occurrence of epoxide ring opening and complexation or cross-linking reactions in and between the ENR chains that involve BF −4 ions have produced a LiBF4-ENR PE with superior thermal property and ionic conductivity as compared to other PEs studied in this work.

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Acknowledgments

The authors would like to thank Universiti Sains Malaysia for the awarded grants: 1001/PKIMIA/811025 and 1001/PKIMIA/843032 in support of this work.

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  1. Nanoscience Research Group, School of Chemical Sciences, Universiti Sains Malaysia, 11800, Penang, Malaysia

    W. L. Tan, M. Abu Bakar & N. H. H. Abu Bakar

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  1. W. L. Tan
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  2. M. Abu Bakar
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  3. N. H. H. Abu Bakar
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Correspondence to M. Abu Bakar.

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Tan, W.L., Abu Bakar, M. & Abu Bakar, N.H.H. Effect of anion of lithium salt on the property of lithium salt-epoxidized natural rubber polymer electrolytes. Ionics 19, 601–613 (2013). https://doi.org/10.1007/s11581-012-0786-9

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