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A new hyperbranched star polyether electrolyte with high ionic conductivity

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Abstract

Hyperbranched poly(glycidol) containing hydroxyl groups was firstly synthesized via anionic polymerization and then reacted with 2-bromoisobutyl bromide to form macroinitiator HPG-Br. Finally, a hyperbranched star polymer (HPG-PPEGMA) was successfully prepared by atom transfer radical polymerization (ATRP) of poly(ethylene glycol) methyl ether methacrylate using HPG-Br as macroinitiator. The structures and properties of the obtained polymers were characterized by 1H NMR, attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The ionic conductivity of the polymer electrolytes composed of HPG-PPEGMA and lithium bis(trifluoromethanesulfonimide) (LiTFSI) was investigated via electrochemical impedance spectroscopy. The results showed that the room temperature ionic conductivity of the prepared hyperbranched star polymer electrolytes had a higher ionic conductivity. When [EO]/[Li] was 20, the ionic conductivity of the hyperbranched star polymer electrolyte was up to 1 × 10−4 Scm−1 at 30 °C. The onset decomposition temperature of the hyperbranched star polyether could reach 374 °C, indicating that the hyperbranched star polymer had a good thermal stability. The XRD results showed that the structure of the hyperbranched star polymer was beneficial to improve the ionic conductivity due to possessing a low degree of crystallinity.

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Acknowledgments

The authors gratefully acknowledge the financial supports provided by the National Natural Science Foundation of China (Nos. 51073170, 50703044).

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China

    Tao Zheng, Qian Xing, Shitong Ren & Liaoyun Zhang

  2. Beijing National Laboratory for Molecular Science, Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China

    Huayi Li

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  1. Tao Zheng
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  2. Qian Xing
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  3. Shitong Ren
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  4. Liaoyun Zhang
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Correspondence to Liaoyun Zhang or Huayi Li.

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Zheng, T., Xing, Q., Ren, S. et al. A new hyperbranched star polyether electrolyte with high ionic conductivity. Ionics 21, 917–925 (2015). https://doi.org/10.1007/s11581-014-1253-6

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  • DOI: https://doi.org/10.1007/s11581-014-1253-6

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