Pal P, Ghosh A
Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India.
Phys Rev E Stat Nonlin Soft Matter Phys. 2015 Dec;92(6):062603. doi: 10.1103/PhysRevE.92.062603. Epub 2015 Dec 28.
In the present paper, we have studied dynamics and relaxation of the charge carriers in polymethylmethacrylate-lithium bis(trifluoromethane sulfonyl)imide polymer electrolytes embedded with 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ionic liquid. We have analyzed the frequency dependent conductivity spectra using the random free-energy barrier model coupled with the contribution of electrode polarization in the low frequency region. The temperature dependence of ionic conductivity, and relaxation time obtained from the analysis of the spectra exhibits Vogel-Tammann-Fulcher type behavior. The Barton-Nakajima-Namikawa relation is consistent with the results obtained from the random free-energy barrier model. The scaling of ac conductivity spectra has been performed to understand the effect of temperature as well as the composition on the relaxation mechanism. The analysis of the ac conductivity also clearly indicates the existence of a nearly constant loss phenomenon at low temperatures or at high frequencies.
在本论文中，我们研究了嵌入1-丁基-1-甲基吡咯烷鎓双（三氟甲基磺酰）亚胺离子液体的聚甲基丙烯酸甲酯-双（三氟甲烷磺酰）亚胺锂聚合物电解质中载流子的动力学和弛豫。我们使用随机自由能垒模型并结合低频区域电极极化的贡献，分析了频率相关的电导率谱。从谱分析得到的离子电导率和弛豫时间的温度依赖性呈现出Vogel-Tammann-Fulcher型行为。Barton-Nakajima-Namikawa关系与从随机自由能垒模型获得的结果一致。已经进行了交流电导率谱的标度分析，以了解温度以及组成对弛豫机制的影响。交流电导率分析也清楚地表明在低温或高频下存在近恒损耗现象。
