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Influence of Humidity on the Complex Structure of PEO-Lithium Salt Polymer Electrolyte

  • Structure and Properties
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Abstract

Solid polymer electrolytes of PEO/LiClO4 and PEO/LiTFSI solution casting films were prepared with the EO/Li molar ratio of 3: 1, and the effect of relative humidity (RH) on their complex structures were characterized. It is shown that the complex structures were barely changed at RH ≤ 10% while severe differences were shown at RH ≥ 20%. The reason was attributed to the interactions of water with lithium salt, and the formation of PEO–Li+–H2O decreased the interactions between PEO and lithium ions. Furthermore, it was shown that the hydrated samples after heat treatment were still strikingly different in characters from their anhydrous precursors, and the type of lithium salt affected the final structures. It was found that the structure of (PEO)3LiClO4 (30% RH) was hardly changed after heating; however, an irreversible compositional transition was discovered in (PEO)3LiTFSI (30% RH) in which case (PEO)2LiTFSI was formed.

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Authors and Affiliations

  1. College of Science, State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing, 102249, China

    Xiaocan Zhang, Lu Zhou, Yufeng Wang & Qiong Zhou

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  1. Xiaocan Zhang
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  2. Lu Zhou
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  3. Yufeng Wang
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  4. Qiong Zhou
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Correspondence to Xiaocan Zhang.

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Zhang, X., Zhou, L., Wang, Y. et al. Influence of Humidity on the Complex Structure of PEO-Lithium Salt Polymer Electrolyte. Polym. Sci. Ser. A 60, 50–56 (2018). https://doi.org/10.1134/S0965545X18010091

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  • DOI: https://doi.org/10.1134/S0965545X18010091

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