聚合物-锂改性蒙脱石复合材料离子迁移

以聚合物（ＰＥＯ，ＰＥＯ－ＰＭＭＡ）和锂改性蒙脱石作为主要原料，采用聚合物粉末直接熔融嵌入的方法，制备聚合物－蒙脱石复合材料．利用ＮＭＲ、ＡＣ阻抗等分析方法探讨了复合材料中聚合物链对 Ｌｉ＋离子迁移的影响．结果表明，聚合物（ＰＥＯ）嵌入蒙脱石层间，层间聚合物链的无序度增大，有利于Ｌｉ＋离子迁移．ＰＭＭＡ引入对ＰＥＯ链的改性，进一步加大聚合物链的无序度，更易于层间Ｌｉ＋离子迁移；复合材料的常温离子电导率接近１０－２Ｓ·ｃｍ－１，且具有良好的温度稳定性．

Study on the Ionic Transport of Polymer - Lithium Exchanged Montmorillonite Composites

The effects of polymer chains on Li + ionic transport were investigated using NMR, AC impedance in polymer-montmorillonite composites synthesized by melt intercalation of polymer in lithium-exchanged montmorillonite. The results show that the intercalation of polymer(PEO) in montmorillonite increases the random arrangement of polymer chains Which is beneficial to the mobility of interlayer Li + ions. PMMA intercalation and modification of PEO with PMMA bring about more random arrangement of polymer chains which are more beneficial to Li + ionic transport. The ionic conductivity of composites is about 10-3 S•cm-1 at room temperature and there is good temperature stability of electrical properties.