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PEO-LiClO4-Li1.3Al0.3Ti1.7 (PO4)3复合聚合物电解质电导率

CONDUCTIVITY STUDIES ON A NEW COMPOSITE POLYMER ELECTROLYTEPEO-LiClO4-Li1.3Al0.3Ti1.7 (PO4)3

    摘要
  • 摘要: 将实验室烧制的无机快离子导体盐Li1.3Al0.3Ti1.7 (PO4)3 、PEO 与LiClO4 按照EO/ Li = 8, 两种锂盐含量为变量进行复合, 通过溶液浇注法制备得到PEO-LiClO4-Li1.3Al0.3Ti1.7 (PO4)3 复合聚合物电解质膜, 以示差扫描热分析法(DSC) 与电化学阻抗( EIS) 测试其性能。DSC 测试结果表明: 按照EO/ Li = 8 将Li1.3Al0.3Ti1.7 (PO4)3 、LiClO4 与PEO 复合的聚合物电解质中PEO 的结晶度由50.34 %下降到4.36 %～28.53 %。室温下该聚合物电解质所有试样的阻抗谱图在高频区呈现为压缩的半圆, 在低频区为一条倾斜的直线, 而在较高温度时, 阻抗谱图主要为一条倾斜的直线。复合聚合物电解质PEO-LiClO4-Li1.3Al0.3Ti1.7 (PO4)3 的离子电导率遵从Arrhe2nius 关系, 在Li1.3Al0.3Ti1.7 (PO4)3 质量分数达到15 %时, 活化能最低, 即4.494425 eV, 此时电导率值最佳, 373 K时为1.161 ×10 -3 S/ cm 和298 K时为7.985 ×10-6 S/ cm。

     

    Abstract: 　Composite polymer electrolytes (CPE) films consisting of PEO , LiClO4 and self-sintered Li1.3Al0.3Ti1.7 (PO4)3 were prepared by the solution casting method with fixed EO/ Li = 8 but different relative compositions of the twolithium salts1 The CPE films were characterized using DSC and electrical impedance spectroscopy ( EIS) . It is found thatthe incorporation of Li1.3Al0.3Ti1.7 (PO4)3 into PEO by keeping EO/ Li = 8 reduces the crystallinity of PEOfrom 50.34 % to the range of 4.36 %～28.53 % depending upon the relative composition of the two salts. The room temperature impedance spectra of the CPE films all exhibited a shape of depressed semicircle in high frequency range and inclined line in low frequency range , but the high temperature ones were mainly the inclined lines1 The ionic conductivity ofthe CPE films followed Arrhenius law and the activation energy ( Ea) of the films was the lowest , i1e1 4.494425 eV , atthe Li1.3Al0.3Ti1.7 (PO4)3 content of 15 % (Mass fraction) . Meanwhile , the ionic conductivity of the CPE filmsreached the optimal values of 1.161 ×10 -3 S/ cm at 373 K and 7.985 ×10 -5 S/ cm at 298 K when the Li1.3Al0.3Ti1.7 (PO4)3 content is also 15 %1

     

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