学术
摘 要:
通过FFIR光谱技术对P（EO）nLiX[X=N（SO2CF3）2，SCN，ClO4]（n=4～60）聚合物电解质的离子缔合行为进行了研究，结果表明在PEO—LiSCN体系中缔合现象较为严重．在高浓度时LiSCN主要以离子对、离子簇以及二聚体形式存在，自由离子含量较少．而对于LiTFSI和LiClO4体系，则以自由离子形式为主．随着锂盐的加入，由于其阴离子的增塑作用使聚氧化乙烯（PEO）中的晶相成分逐渐向无定形相转化．当锂盐含量增加到一定程度，体系中会有不同晶相复合物的形成．[著者文摘]
文章出处:
《化学学报》-2007年65卷24期 -2832-2838页
栏目信息:
分 类 号:
FTIR Characterization of Ion Association and Phase Composition in PEO-based Polymer Electrolytes
CHENG, Hu ZHU, Chang-Bao YANG, Yong （State Key Laboratory for Physical Chemistry of Solid Surface, Xiamen University, Xiamen 361005）
Abstract:
FTIR spectra of P（EO）nLiX [X=N（SO2CF3）2, SCN, ClO4] polymer electrolytes have been obtained for ethylene oxide/Li ratios from 60 ; 1 to 4 ; 1. It was shown that ion association in the PEO-LiSCN system is more serious than in the other two systems. At a high LiSCN concentration, contact ion pairs, triple ions and dimers are main ion species in the polymer electrolytes. However, free ions are main ion species in PEO-LiTFSI and PEO-LiClO4 systems. When Li salt was added into PEO, a plastizing role of Li salt anions can lead to transformation of a crystalline phase of PEO into an amorphous phase. When Li salt content exceeds a certain value, some kinds of crystalline complexes will be formed in PEO-LiX systems.[著者文摘]
Key words:
polymer electrolyte; ion association; crystal; FTIR
基金资助:
国家自然科学基金（Nos.20473068,29925310）和教育部霍英东优秀青年教师基金资助项目.
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