Ionic Conductivity in the Solid Glyme Complexes [CH3O(CH2CH2O)nCH3]:LiAsF6 (n = 3,4)

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• 作者：Chuhong Zhang ; David Ainsworth ; Yuri G. Andreev ; Peter G. Bruce
• 刊名：Journal of the American Chemical Society
• 出版年：2007
• 出版时间：July 18, 2007
• 年：2007
• 卷：129
• 期：28
• 页码：8700 - 8701
• 全文大小：169K
• 年卷期：v.129,no.28(July 18, 2007)
• ISSN：1520-5126

文摘

We have shown that two small molecule solid electrolytes, [CH₃O(CH₂CH₂O)₃CH₃]:LiAsF₆ and [CH₃O(CH₂CH₂O)₄CH₃]:LiAsF₆, differing by only one ethylene oxide unit exhibit markedly different transport numbers, t₊= 0.8 and 0.1, respectively. Such differences are related, on the one hand, to the presence of tunnels for Li⁺ migration in the crystal structure of the G3 complex, but not G4, and, on the other hand, to the weaker binding of AsF₆^- in the structure of G4 than in G3. Learning how to construct solid electrolytes that exhibit high Li⁺ transport numbers is important in minimizing polarization when such electrolytes are used in all-solid-state cells, such as lithium batteries.