【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.更多还原

【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+ trans-ference number increased obviously by adding the Li-FER powder. The crystal properties of the composite poly-mer 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.更多还原