Facile One Pot Polycondensation Method to Synthesize the Crosslinked Polyethylene glycol-Based Copolymer Electrolytes

Xianjing Gong, Dean Shi, Huihui Zeng, Yingkui Yang, Tao Jiang, Qunchao Zhang, Shichun Jiang, Robert K.Y. Li, Yiu Wing Mai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

Comb-like polyethylene glycol (PEG)-based copolymer electrolytes with given crosslinking density are synthesized using PEG as the main chain segments (denoted as MC-PEG), methoxy polyethylene glycol (MPEG) as side chain segments (denoted as SC-PEG), and hexamethylene-1,6-diisocyanate homopolymer (HDI trimer) as bridging and/or crosslinking agent. In this study, the effects of molecular weight of MC-PEG and SC-PEG on Li ion conductivities of the copolymer have been examined. If MC-PEG and/or SC-PEG do not crystallize, the ion conductivities of graft copolymer electrolyte increase with either decreasing MC-PEG or increasing SC-PEG segment length. The highest ion conductivity of the copolymer electrolyte at room temperature reaches up to 7.7 × 10−4 S cm−1 when the molecular weight of MC-PEG is 400 g mol−1 and SC-PEG is 1000 g mol−1 (denoted as GC400-1000). However, when the MC-PEG and/or SC-PEG segments begin to crystallize (i.e., GC400-2000), where the flexibility of the related PEG molecular chains is largely reduced, the ion conductivity drops by almost two orders comparing to that of GC400-1000 copolymer electrolyte. Meanwhile, crosslinked GC400-1000 electrolyte has good thermal and electrochemical stability as well as high mechanical properties, making it suitable for commercial applications in Li ion secondary batteries. (Figure presented.) .

Original languageEnglish
Pages (from-to)1607-1613
Number of pages7
JournalMacromolecular Chemistry and Physics
Volume217
Issue number14
DOIs
Publication statusPublished - 1 Jul 2016
Externally publishedYes

Keywords

  • comb-like copolymers
  • crosslinked
  • PEG
  • polymer electrolytes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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