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

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 (HD...

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Published in:Macromolecular chemistry and physics Vol. 217; no. 14; pp. 1607 - 1613
Main Authors: Gong, Xianjing, Shi, Dean, Zeng, Huihui, Yang, Yingkui, Jiang, Tao, Zhang, Qunchao, Jiang, Shichun, Li, Robert K. Y., Mai, Yiu-Wing
Format: Journal Article
Language:English
Published: Weinheim Blackwell Publishing Ltd 01-07-2016
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Summary: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. Comb‐like PEG‐based polymer electrolytes, with different molecular weight of side‐chains or main‐chain segments, have been synthesized by facile one‐pot polycondensation. It is found that crystallization is harmful for ion conduction and uncrystallizable polymer electrolyte holds nice thermal, electrochemical, and mechanical properties, which provides promising project for lithium batteries.
Bibliography:Council of the Hong Kong Special Administrative Region, China - No. CityU 118313
ark:/67375/WNG-6Q8DLKTD-1
ArticleID:MACP201600040
Doctoral Fund of Ministry of Education of China - No. 20134208110006
istex:1C3FDCC91D38ACC2C4C41CC3B559075D1B35EA0F
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1022-1352
1521-3935
DOI:10.1002/macp.201600040