含锂沸石Li-FER提高PEO复合聚合物电解质电导率  

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

作　　者：李雪莉[1] 郭娟[1] 吴强[1] 程岩[1] 龙英才[1] 江志裕[1] 

机构地区：[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

出　　处：《物理化学学报》2005年第4期397-401,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20333040)资助项目~~

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鄄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鄄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鄄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.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.

关 键 词：沸石 镁碱沸石(FER) 聚氧乙烯(PEO) 聚合物电解质 电导率 

分 类 号：O631.2[理学—高分子化学]