Influence of Al₂O₃ Nanowires on Ion Transport in Nanocomposite Solid Polymer Electrolytes
2018
Kwon, Suk Jin | Jung, Byung Mun | Kim, T'ae-hun | Byun, Jinho | Lee, Jaekwang | Lee, Sang Bok | Choi, U Hyeok
Understanding the ion transport mechanism in nanocomposite solid polymer electrolytes is necessary to develop next-generation electrochemical devices. We investigate the role of inorganic nanoparticle on ion conduction and segmental dynamics in cross-linked epoxy-based nanocomposite solid polymer electrolytes, complexed with Li⁺F₃CSO₂NSO₂CF₃– (LiTFSI) salt and Al₂O₃ nanowire, using dielectric relaxation spectroscopy. The addition of Al₂O₃ not only increases the ionic conductivity σDC by up to ∼10 times but also accelerates the segmental α motion compared to the host electrolyte. Increasing Al₂O₃ content leads to a reduction in segmental α relaxation temperature Tα (fast dynamics), resulting in increased ion mobility as well as an enhancement in segmental α relaxation strength Δεα, lowering ion dissociation energy, as revealed by density functional theory calculations, thereby providing more mobile ions for conduction. This ion transport investigation provides insights into the design of high-conductivity nanocomposite solid polymer electrolytes for energy applications.
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