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Issue 48, 2018
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Creating ionic channels in single-ion conducting solid polymer electrolyte by manipulating phase separation structure

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Abstract

Single-ion conducting solid polymer electrolytes (SICSPEs) with high ionic conductivity are vital for next-generation electrochemical devices. Herein, we presented a novel method to manipulate the phase separation structure of SICSPEs, leading to the construction of long-range conducting ionic channels for rapid ion transport. Ionic nanowires were first fabricated by anchoring numerous lithium sulfonyl(trifluoromethanesulfonyl)imide groups on poly(ether ether ketone) backbones. Then, the ionic nanowires were dispersed in a well-designed hyperbranched polymer, poly(polyethylene glycol methyl ether methacrylate), to fabricate a blend membrane. Intertwined and continuous ionic channels were observed in the blend membrane by transmission electron microscopy. The blend membrane exhibited high conductivity of 0.17 × 10−3 to 1.01 × 10−3 S cm−1 and an outstanding lithium ion transference number of 0.898–0.936. A half-cell using LiFePO4 and the blend membrane exhibited discharge capacities (0.2C) of 121.7 and 152.7 mA h g−1 at 25 and 60 °C, respectively. This study revealed a facile strategy to design high-performance ion-conducting membranes that are attractive for use in lithium ion batteries.

Graphical abstract: Creating ionic channels in single-ion conducting solid polymer electrolyte by manipulating phase separation structure

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Publication details

The article was received on 14 Sep 2018, accepted on 20 Nov 2018 and first published on 23 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA08967A
J. Mater. Chem. A, 2018,6, 24848-24859

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    Creating ionic channels in single-ion conducting solid polymer electrolyte by manipulating phase separation structure

    Z. Li, Q. Yao, Q. Zhang, Y. Zhao, D. Gao, S. Li and S. Xu, J. Mater. Chem. A, 2018, 6, 24848
    DOI: 10.1039/C8TA08967A

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