Saxena Amit, Bhattacharya Bhaskar
Department of Physics, MMV, Banaras Hindu University, Varanasi 221005, India.
Department of Physics, IPS Academy, Jhabua 457661, India.
ACS Omega. 2023 Sep 13;8(38):35256-35265. doi: 10.1021/acsomega.3c05006. eCollection 2023 Sep 26.
Solid polymer electrolytes (SPEs) made from a polymer-salt matrix show great potential for use in various applications, such as batteries, fuel cells, supercapacitors, solar cells, and electrochromic devices. Research on various theoretical and experimental aspects of these SPEs is highly pursued worldwide. However, due to the lack of direct experimental techniques for the measurement of the number of charge carriers () and their mobility (μ), reports on their correlation with conductivity (σ) and their exact theoretical justification are rare in literature studies. This paper is an attempt toward the search for the well-established theoretical formulation for and μ that can justify the experimental results. In a previous attempt, it could only be demonstrated that the available theoretical bases show different values, but we could not come to any concrete conclusion. This research involves the use of three theoretical models, namely, the Rice and Roth model, the Trukhan model, and the Schutt and Gerdes model. The purpose of this study is to analyze the varying conductivity levels by calculating the concentration and mobility of charge carriers. To obtain the required parameters, impedance spectroscopy data were used. The Trukhan model was used to determine the precise value of the diffusion coefficient. By utilizing the dielectric tangent loss, the concentration of charge carriers and ion mobility were calculated. The Schutt and Gerdes (S&G) model was also used; this model is based on the dielectric constant and the relaxation frequency, which were derived from the EIS data. Finally, the Rice and Roth model was also employed, which is known for the ion transport in "super" ionic conductors. This was employed on the temperature-dependent impedance data for three different compositions of the films. A correlation is established between and μ with σ using all three models. However, the Trukhan model is the most suitable for explaining the behavior of our system.
由聚合物 - 盐基质制成的固体聚合物电解质（SPEs）在电池、燃料电池、超级电容器、太阳能电池和电致变色器件等各种应用中显示出巨大的应用潜力。全球范围内对这些SPEs的各种理论和实验方面的研究都在积极进行。然而，由于缺乏用于测量载流子数量（）及其迁移率（μ）的直接实验技术，在文献研究中很少有关于它们与电导率（σ）的相关性及其确切理论依据的报道。本文旨在寻找一种成熟的理论公式来解释 和 μ，以证明实验结果。在之前的尝试中，只能证明现有的理论基础显示出不同的值，但我们无法得出任何具体结论。本研究涉及使用三种理论模型，即赖斯和罗斯模型、特鲁汗模型以及舒特和格德斯模型。本研究的目的是通过计算载流子的浓度和迁移率来分析不同的电导率水平。为了获得所需的参数，使用了阻抗谱数据。特鲁汗模型用于确定扩散系数的精确值。通过利用介电损耗正切，计算了载流子浓度和离子迁移率。还使用了舒特和格德斯（S&G）模型；该模型基于从EIS数据得出的介电常数和弛豫频率。最后，还采用了以“超”离子导体中的离子传输而闻名的赖斯和罗斯模型。将其应用于三种不同薄膜组成的温度相关阻抗数据。使用所有三种模型建立了 和 μ 与 σ 之间的相关性。然而，特鲁汗模型最适合解释我们系统的行为。
