物理化学学报 >> 2005, Vol. 21 >> Issue (04): 397-401.doi: 10.3866/PKU.WHXB20050411

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含锂沸石Li-FER提高PEO复合聚合物电解质电导率

李雪莉; 郭娟; 吴强; 程岩; 龙英才; 江志裕   

  1. 复旦大学化学系, 上海分子催化和功能材料重点实验室, 上海 200433
  • 收稿日期:2004-08-31 修回日期:2004-11-29 发布日期:2005-04-15
  • 通讯作者: 江志裕 E-mail:zyjiang@fudan.ac.cn

Research on the Enhanced Conductivity of Poly(ethylene oxide) Electrolyte by Adding Zeolite Li-FER

LI Xue-Li; GUO Juan; WU Qiang; CHENG Yan; LONG Ying-Cai; JIANG Zhi-Yu   

  1. Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry，Fudan University, Shanghai 200433
  • Received:2004-08-31 Revised:2004-11-29 Published:2005-04-15
  • Contact: JIANG Zhi-Yu E-mail:zyjiang@fudan.ac.cn

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摘要： 通过离子交换方法使锂部分取代了镁碱沸石（FER）孔道壁上羟基中的氢，制得含锂沸石Li-FER. 将这种沸石作为无机填料加入到PEO/LiClO4聚合物电解质中，可以使其室温电导率提高三个数量级以上. 电化学测量表明， 锂离子与PEO和含锂沸石中氧的相互作用提高了聚合物电解质中锂离子的迁移数. 另一方面， 采用XRD, DSC, PLM等方法研究了电解质的结晶状况.结果表明, Li-FER可以作为PEO链段结晶的成核剂，使PEO电解质的晶粒得到细化， 结晶度降低，为Li+的传输提供了更多的非晶区通道. 这是Li-FER的加入促使PEO聚合物电解质电导率提高的两个主要原因.

关键词: 沸石, 镁碱沸石(FER), 聚氧乙烯(PEO), 聚合物电解质, 电导率

Abstract: Li-ferrierite (Li-FER) fine powder was prepared via an ion exchange process using lithium ions to replace the hydrogen atoms in hydroxyl group of FER. Compared with bare LiClO4 /PEO [poly(ethylene oxide)] polymer electrolyte, the ionic conductivity of PEO composite polymer electrolyte was enhanced more than three orders by adding the Li-FER powder in it. The results of electrochemical measurements show that the Li+ transference number increased obviously by adding the Li-FER powder. The crystal properties of the composite polymer electrolytes were investigated by XRD, DSC, and polarized light microscopy (PLM) methods. It was found that the Li-FER fine powder could act as crystal nucleator to make grain refinement and provide more continuous amorphous domain, in which Li+ ions can move more easily. Therefore the conductivity of the PEO composite polymer electrolytes increased greatly.

Key words: Zeolite, Ferrierite (FER), PEO, Polymer electrolyte, Conductivity