Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 48, Pages 24848-24859Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta08967a
Keywords
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Funding
- National Natural Science Foundation of China [51274130]
- Ministry of Science and Technology Special Fund for Innovative Technology [2015IM040100]
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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 x 10(-3) to 1.01 x 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 degrees C, respectively. This study revealed a facile strategy to design high-performance ion-conducting membranes that are attractive for use in lithium ion batteries.
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