Journal
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
Volume 27, Issue 2, Pages 1370-1377Publisher
SPRINGER
DOI: 10.1007/s10854-015-3899-x
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- Science and Technology Foundation of Shenzhen, Shenzhen, China
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Lithium ion conducting biodegradable gel polymer electrolytes based on a poly (epsilon-caprolactone):lithium tetrafluoroborate (PCL:LiBF4) system doped with various concentrations of 1-Ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4) ionic liquid were prepared by solution cast technique. The gel polymer electrolyte was eco-friendly, flexible, transparent and free-standing. The conductivity and transference number measurements were carried out to investigate ionic conduction and charge transport in the gel polymer electrolytes. The frequency-dependent conductivity results revealed that the room-temperature electrical conductivity increased with increasing EMIMBF4 concentration. At room temperature, the gel polymer electrolyte with a composition of 85PCL:15LiBF(4) + 40EMIMBF(4) exhibited a high conductivity value of approximately 2.83 x 10(-4) S cm(-1), which was favored by the rich amorphous phase as confirmed with X-ray diffraction analysis. The lithium ion transport number and electrochemical stability of the 40 % EMIMBF4 gel polymer electrolyte were 0.43 and 3.7 V, respectively. These values are acceptable and quite enough for practical device applications. Consequently, the 40 wt% EMIMBF4 incorporated gel polymer electrolyte could be used to fabricate lithium ion batteries with a suitable selection of other components of the battery system.
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