快冷对PEO/LiClO_4固态电解质的晶型与导电性的影响

聚合物电解质的离子电导率是电解质的一个重要参数 ,与聚合物电解质中的非晶态的存在有很大的关系。在本文中 ,以X射线衍射 (XRD)、差热分析 (DTA)和交流阻抗 (Acimpedance)为研究手段 ,研究了快冷对聚合物电解质的晶型转变和对聚合物电解质室温离子电导率的影响。在快速冷却的条件下 ,质量比为1∶1的PEO/LiClO4聚合物电解质的室温离子电导率可达 1 6 1x 10 -7S/cm ,比慢冷处理的相同体系的室温离子电导率提高了 1个数量级。实验证明 ,快速冷却可破坏聚合物的结晶性 ,提高聚合物电解质的离子电导率。

The Effect of Different Cooling Velocity on The Conductivity of Complex Polymer Electrolyte PEO/LiClO4

The conductivity of polymer electrolyte is an important parameter for polymer electrolyte,having an essential relationship with the essence of a amorphous polymer phase in the composite electrolytes.In this study,the effect of different cooling velocity on the conductivity of complex polymer electrolyte PEO/LiClO_4 was analysized by Ac impedance,X-Ray diffraction and DTA. Under supercooling condition,where cooling velocity is 20℃/s,the conductivity of PEO/LiClO_4 polymer electrolyte,in the mass ratio 1 to 1,is 7.12×10 -5 S/cm at ambient temperature,which is about two orders of magnitude greater as compared with that of not-supercooling counterpart.The results show that the crystalline behavior of PEO/LiClO_4 hybrid system is sternly destroyed,leading to a significant conductivity enhancement.