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Probing the Dynamics of Li+ Ions on the Crystal Surface: A Solid-State NMR Study

Material Science Department & Physics Department & Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, North Zhongshan Road 3663, Shanghai 200062, China
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Polymers 2020, 12(2), 391; https://doi.org/10.3390/polym12020391
Received: 23 December 2019 / Revised: 22 January 2020 / Accepted: 2 February 2020 / Published: 9 February 2020
(This article belongs to the Section Polymer Analysis)
Polyethylene oxide-based solid polymer electrolytes (SPEs) are of research interest because of their potential applications in all-solid-state Li+ batteries. However, despite their advantages in terms of compatibility with the electrodes and easy processing, polyethylene oxide (PEO)/Li+ complexes often suffer from low conductivity at room temperature. Understanding the conduction mechanism and, in turn, developing strategies to improve the conductivity have long been the main objectives underlying research into PEO/Li+ complex electrolytes. Here, we prepared several special PEO/Li+ complex samples where the PEO/Li+ complex structures were located on the surfaces of PEO crystals and consisted of high content chain ends. We found two different Li+ species in the PEO/Li+ complex structures via solid-state nuclear magnetic resonance (NMR). The 2D 7Li exchange NMR showed the exchange process between the different Li+ species. The exchange dynamics of the Li+ ions provide a molecular mechanism of the Li+ transportation in the surface of PEO crystal lamella, which is further correlated with the ionic conduction mechanism of the PEO/Li+ complex structure. View Full-Text
Keywords: solid-state NMR; polymer electrolytes; Li+ motion solid-state NMR; polymer electrolytes; Li+ motion
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Wang, B.-H.; Xia, T.; Chen, Q.; Yao, Y.-F. Probing the Dynamics of Li+ Ions on the Crystal Surface: A Solid-State NMR Study. Polymers 2020, 12, 391.

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