电解质
增塑剂
碳酸乙烯酯
聚合物电解质
材料科学
电导率
离子电导率
碳酸丙烯酯
载流子
电荷(物理)
聚合物
电介质
化学工程
分析化学(期刊)
高分子化学
复合材料
化学物理
化学
物理化学
光电子学
物理
电极
量子力学
工程类
作者
Pramod Kumar Pal,Aswini Ghosh
摘要
We have studied the charge carrier dynamics in poly(methylmethacrylate)-LiClO4 polymer electrolytes plasticized with different plasticizers such as ethylene carbonate (EC), propylene carbonate (PC), polyethylene glycol (PEG), and dimethyl carbonate (DMC). We have measured the broadband complex conductivity spectra of these electrolytes in the frequency range of 0.01 Hz–3 GHz and in the temperature range of 203 K–363 K and analyzed the conductivity spectra in the framework of the random barrier model by taking into account the contribution of the electrode polarization observed at low frequencies and/or at high temperatures. It is observed that the temperature dependences of the ionic conductivity and relaxation time follow the Vogel-Tammann-Fulcher relation for all plasticized electrolytes. We have also performed the scaling of the conductivity spectra, which indicates that the charge carrier dynamics is almost independent of temperature and plasticizers in a limited frequency range. The existence of nearly constant loss in these electrolytes has been observed at low temperatures and/or high frequencies. We have studied the dielectric relaxation in these electrolytes using electric modulus formalism and obtained the stretched exponent and the decay function. We have observed less cooperative ion dynamics in electrolytes plasticized with DMC compared to electrolytes plasticized with EC, PC, and PEG.
科研通智能强力驱动
Strongly Powered by AbleSci AI