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New oligoether plasticizers for poly(ethylene oxide)-based solid polymer electrolytes

Ionics volume 25, pages 1633–1643 (2019)Cite this article

Abstract

Two new plasticizers, nitrile groups terminated oligoether (NOE) and lithium sulfonamide groups containing oligoether (LSA), have been synthesized to construct superior poly(ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs). The chemical structures of these plasticizers were confirmed by FTIR, 1H-NMR, and elemental analysis. The electrochemical and thermal properties of the resulting SPEs have been thoroughly evaluated. The SPEs containing varied weight ratios of these plasticizers along with different Li/O mole ratios of lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) have been investigated to optimize the electrolyte systems. Both plasticizers displayed good ionic conductivity at elevated temperatures. The SPE containing 40 wt.% of NOE in 12:1 PEO-LiTFSI complex showed ionic conductivity of 1.11 × 10−4 S cm−1 at 312 K, while the SPE containing 10 wt.% of LSA in 12:1 PEO-LiTFSI complex showed 5.08 × 10−5 S cm−1 and 1.88 × 10−4 S cm−1 at room temperature and 312 K, respectively. Most notably, the SPE containing 10 wt.% LSA in 14:1 PEO-LiTFSI complex displayed ionic conductivity of 1.01 × 10−3 S cm−1 at 343 K. Moreover, these SPEs exhibited good electrochemical stability (~ 4.2 V vs. Li+/Li) and displayed no noticeable thermal degradations below 350 °C.

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Authors and Affiliations

  1. Department of Chemistry, Illinois Institute of Technology, Chicago, IL, 60616, USA

    Qiang Ma, Xinyi Mei, Zheng Yue, Hamza Dunya, Robert Filler & Braja K. Mandal

  2. Department of Physical Sciences, Dominican University, River Forest, IL, 60305, USA

    Amartya Chakrabarti

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  1. Qiang Ma
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  2. Amartya Chakrabarti
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Correspondence to Braja K. Mandal.

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Ma, Q., Chakrabarti, A., Mei, X. et al. New oligoether plasticizers for poly(ethylene oxide)-based solid polymer electrolytes. Ionics 25, 1633–1643 (2019). https://doi.org/10.1007/s11581-018-2752-7

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  • DOI: https://doi.org/10.1007/s11581-018-2752-7

Keywords

  • Lithium-ion batteries
  • Solid polymer electrolytes
  • Oligoether plasticizers
  • Ionic conductivity
  • Electrochemical stability