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Synthesis and ionic conductivity of a novel ionic liquid polymer electrolyte

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Abstract

Hyperbranched poly(glycidol) (HPG) containing hydroxyl groups is firstly synthesized via anionic polymerization, and then reacts with thionyl chloride to form chlorine end-terminated hyperbranched poly(glycidol) (HPG-Cl). Different ionic liquid polymers are synthesized from the reaction of HPG-Cl with N-methylimidazole and then anion exchange with hexafluorophosphoric acid and sodium tetrafluoroborate. The structure and properties of the obtained ionic liquid polymers are characterized by 1H NMR, ATR-FTIR, DSC and TGA, respectively. Ionic conductivity of the polymer electrolytes composed of ionic liquid polymer and lithium bis(trifluoromethanesulfonimide) (LITFSI) is investigated by electrochemical impedance spectroscopy. The results show that the ionic conductivity of the prepared ionic liquid polymer electrolyte can reach 3.5 × 10−4 Scm−1 at 30 °C when the weight ratio of ionic liquid polymer ([HPG-MeIm]BF4) to lithium salt (LiTFSI) is 4.5.

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Acknowledgments

The authors gratefully acknowledge the financial supports provided by the National Natural Science Foundation of China (No. 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, Shitong Ren, Qian Zhou & Liaoyun Zhang

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

    Qian Li & Huayi Li

  3. Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China

    Yuan Lin

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  1. Tao Zheng
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  2. Shitong Ren
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  3. Qian Zhou
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  4. Qian Li
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  5. Liaoyun Zhang
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  6. Huayi Li
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  7. Yuan Lin
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Correspondence to Liaoyun Zhang or Huayi Li.

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Zheng, T., Ren, S., Zhou, Q. et al. Synthesis and ionic conductivity of a novel ionic liquid polymer electrolyte. J Polym Res 21, 361 (2014). https://doi.org/10.1007/s10965-014-0361-3

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