Synthesis and electrochemical properties of gel polymer electrolyte using poly(2-(dimethylamino)ethyl methacrylate-co-methyl methacrylate) for fabricating lithium ion polymer battery

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• 作者：Sohee Kim ; Jungdon Suk ; Sungkwon Hong ; Mijeong Han ; Yongku Kang
• 关键词：poly(2 ; (dimethylamino)ethyl methacrylate ; co ; methyl methacrylate) ; gel polymer electrolyte ; ionic conductivity ; lithium ; ion polymer battery
• 刊名：Macromolecular Research
• 出版年：2014
• 出版时间：August 2014
• 年：2014
• 卷：22
• 期：8
• 页码：875-881
• 全文大小：534 KB
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• 作者单位：Sohee Kim (1) (2)
  Jungdon Suk (1)
  Sungkwon Hong (2)
  Mijeong Han (1)
  Yongku Kang (1)
  
  1. Advanced Materials Division, Korea Research Institute of Chemical Technology, Daejeon, 305-600, Korea
  2. Department of Polymer Science and Engineering, Chungnam National University, Daejeon, 305-764, Korea
  
• ISSN：2092-7673

文摘

Random copolymers comprising 2-(dimethylamino)ethyl methacrylate (DMAEMA) and methyl methacrylate (MMA) are synthesized by radical polymerization using 2,2-azobis(2-methylpropionitrile) (AIBN) as an initiator. Gel polymer electrolytes (GPEs) are prepared by in situ thermal curing using different ratios of siloxane-epoxide cross-linker to poly(DMAEMA-co-MMA) and various contents and types of liquid electrolytes. GPEs offer several advantages such as in situ thermal cross-linking without requiring an additional radical initiator, relatively shorter curing time (~3 h) and lower curing temperature. When the ratio of the siloxane-epoxide cross-linker to poly(DMAEMA-co-MMA) is 1:5, the GPE with 98 wt% liquid electrolyte exhibits the highest ionic conductivity of 8.87×10? S/cm at 30 °C. The electrochemical stability window of the GPE is measured to be 5.1 V vs. Li/Li+. A unit cell comprising LiCoO2/GPE/graphite exhibits an initial discharge capacity of 145.6 mAh/g at 0.1 C, and the unit cell has good rate capability and cycling performance.