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- W2045384368 abstract "We explore in detail what information on ionic diffusivity and ion pairing can be exclusively gained from combining accurate direct-current conductivity data in polymer electrolytes with a novel evaluation model. The study was performed on two prototype systems based on poly(ethylene oxide) (PEO) with known disparate ion-association properties, which are due to the dissimilar salt components being either sodium iodide (NaI) or lithium bis(trifluoromethane-sulfonyl)imide (LiN(CF3SO2)2 or LiTFSI). The temperature dependence of the conductivity can be described by an extended Vogel–Tammann–Fulcher (VTF) equation, which involves a Boltzmann factor containing the pair-formation enthalpy ΔHp. We find a distinct increase of the positive ΔHp values with decreasing salt concentration and similarly clear trends for the pertinent VTF parameters. The analysis further reveals that PEO–NaI combines a high pair fraction with a high diffusivity of the I– ion. By contrast, PEO–LiTFSI appears to be characterized by a low ion-pairing tendency and a relatively low mobility of the bulky TFSI– ion. The observed marked differences between PEO–NaI and PEO–LiTFSI complexes of homologous composition are most pronounced at high temperatures and low salt concentrations." @default.
- W2045384368 created "2016-06-24" @default.
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- W2045384368 date "2012-02-29" @default.
- W2045384368 modified "2023-10-18" @default.
- W2045384368 title "What Can We Learn from Ionic Conductivity Measurements in Polymer Electrolytes? A Case Study on Poly(ethylene oxide) (PEO)–NaI and PEO–LiTFSI" @default.
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- W2045384368 doi "https://doi.org/10.1021/jp2111956" @default.
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