Poly(ethylenimine)-Based Polymer Blends as Single-Ion Lithium Conductors

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• 作者：Robert P. Doyle ; Xiaorui Chen ; Max Macrae ; Abhijit Srungavarapu ; Luis J. Smith ; Manesh Gopinadhan ; Chinedum O. Osuji ; Sergio Granados-Focil
• 刊名：Macromolecules
• 出版年：2014
• 出版时间：May 27, 2014
• 年：2014
• 卷：47
• 期：10
• 页码：3401-3408
• 全文大小：401K
• 年卷期：v.47,no.10(May 27, 2014)
• ISSN：1520-5835

文摘

Highly conductive solid polymer electrolytes were generated by blending linear poly(ethyleneimine)-graft-poly(ethylene glycol) with linear poly(ethyleneimine) bearing lithium N-propylsulfonate groups as the lithium source. The effect of polymer backbone structure on Li⁺ conductivity was determined by comparing a series of blends made from the PEI-based materials with those from polymethacrylate backbone analogues. The use of PEI backbones promoted ion-pair dissociation, stabilized the macromolecular mix and generated blends with ionic conductivities up to 2 orders of magnitude higher than those of the polymethacrylate-based systems. Blends containing the PEI-bound lithium sulfonates exhibited lithium conductivities higher than those measured for PEG doped with lithium bis(trifluoromethyl)sulfonimide. Shifts in the 谓_s(SO₃) IR absorption band suggest that the solvation environment for the lithium sulfonates changes with polymer structure. The PEI-based blends are thermally stable up to 200 掳C, electrochemically stable in the 卤5 V range, and showed unparalleled ionic conductivities (0.4 mS/cm at room temperature and 5 mS/cm at 80 掳C) for solvent-free systems with polymer-bound anions.