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- Title
Facile One Pot Polycondensation Method to Synthesize the Crosslinked Polyethylene glycol-Based Copolymer Electrolytes.
- Authors
Gong, Xianjing; Shi, Dean; Zeng, Huihui; Yang, Yingkui; Jiang, Tao; Zhang, Qunchao; Jiang, Shichun; Li, Robert K. Y.; Mai, Yiu‐Wing
- 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.
- Subjects
POLYCONDENSATION; POLYETHYLENE glycol; CROSSLINKED polymers; ELECTROLYTES; COPOLYMERIZATION; THERMAL stability
- Publication
Macromolecular Chemistry & Physics, 2016, Vol 217, Issue 14, p1607
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201600040