Ionic liquid-doped gel polymer electrolyte for flexible lithium-ion polymer batteries

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Abstract

Application of gel polymer electrolytes (GPE) in lithium-ion polymer batteries can address many shortcomings associated with liquid electrolyte lithium-ion batteries. Due to their physical structure, GPEs exhibit lower ion conductivity compared to their liquid counterparts. In this work, we have investigated and report improved ion conductivity in GPEs doped with ionic liquid. Samples containing ionic liquid at a variety of volume percentages (vol %) were characterized for their electrochemical and ionic properties. It is concluded that excess ionic liquid can damage internal structure of the batteries and result in unwanted electrochemical reactions; however, samples containing 40-50 vol % ionic liquid exhibit superior ionic properties and lower internal resistance compared to those containing less or more ionic liquids.

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Zhang, R., Chen, Y., & Montazami, R. (2015). Ionic liquid-doped gel polymer electrolyte for flexible lithium-ion polymer batteries. Materials, 8(5), 2735–2748. https://doi.org/10.3390/ma8052735

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