Gelation of Solvate Ionic Liquid by Self-Assembly of Block Copolymer and Characterization as Polymer Electrolyte

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• 作者：Yuzo Kitazawa ; Kaori Iwata ; Satoru Imaizumi ; Hyungmin Ahn ; Sung Yeon Kim ; Kazuhide Ueno ; Moon Jeong Park ; Masayoshi Watanabe
• 刊名：Macromolecules
• 出版年：2014
• 出版时间：September 9, 2014
• 年：2014
• 卷：47
• 期：17
• 页码：6009-6016
• 全文大小：452K
• ISSN：1520-5835

文摘

We report a new class of polymer electrolytes that exhibit high Li⁺-ionic conductivity and thermal stability up to 200 掳C. The polymer electrolyte consists of a solvate ionic liquid ([Li(G4)][TFSA]), comprising an equimolar mixture of lithium bis(trifluoromethanesulfonyl)amide (Li[TFSA]) and tetraglyme (G4), and a well-defined ABA-triblock copolymer, polystyrene-b-poly(methyl methacrylate)-b-polystyrene (PSt-b-PMMA-b-PSt, SMS). The electrolyte is formed by the self-assembly of SMS, where the solvatophobic PSt segments serves as physical cross-linking points, and the solvatophilic PMMA segment with preferentially dissolved [Li(G4)][TFSA] forms ion-conduction paths. In the electrolyte, the preservation of the complex cation [Li(G4)]⁺ in the PMMA phase was demonstrated by pulsed-field gradient spin鈥揺cho (PGSE) NMR, Raman spectra, and thermogravimetric analysis. Because of the preservation of [Li(G4)]⁺, which hinders the direct interaction of Li⁺ with the polymer segment and the coupling of the ionic transport from the segmental motion, the room temperature ionic conductivity of the electrolyte reached an appreciable level (10^鈥?鈥?0^鈥? S cm^鈥?).