In the present study, electrochemical impedance analysis in terms of electrical conductivity, dielectric permittivity, and electrical modulus has been carried out of prepared sodium ion-conducting nanocomposite gel polymer electrolyte. To study ion conduction behavior, frequency-dependent AC conductivity has also been analyzed. Dielectric constant (ε′) and dielectric loss (ε′′) as a function of frequency with different nanofiller SiO₂ concentrations as well as at different temperatures ranging from 303 to 333 K have been discussed. The low-frequency region showed high values of dielectric constant due to polarization at the electrode–electrolyte interface. Frequency-dependent real (M′) and imaginary part (M′′) of modulus reveal large capacitance associated with it at lower frequency whereas dispersion (conductivity relaxation) at a higher frequency. The tangent loss (tan δ) of the electrolyte systems has been determined for different frequencies and concentrations of fumed silica nanoparticles. The high conducting nanocomposite gel polymer membrane exhibited an electrochemical stability window of ≈ 3.3 V which is sufficient to apply this material as a separator for electrochemical device application. The conductivity, dielectric, modulus, and electrochemical stability studies reveal that sodium ion-conducting nanocomposite gel polymer electrolytes offer good electrochemical properties and are suitable for application in any electrochemical/power conversion device. The optimized flexible nanocomposite gel polymer electrolyte films have been used in a prototype sodium battery, which shows a stable open-circuit potential of ~ 2.1 V and a significant first specific discharge capacity of ~ 500 mAh g⁻¹ at a drain current of 14 mA g⁻¹.

在本研究中，已经对制备的钠离子导电纳米复合凝胶聚合物电解质进行了电导率，介电常数和电模量方面的电化学阻抗分析。为了研究离子传导行为，还分析了频率相关的交流电传导率。讨论了介电常数（ε'）和介电损耗（ε''）与频率的关系，具有不同的纳米填料SiO ₂浓度以及在303至333 K的不同温度下。低频区域由于电极-电解质界面处的极化而显示出较高的介电常数值。频率相关实部（M'）和虚部（M''模量）显示出在较低频率下具有与其相关的大电容，而在较高频率下具有色散（电导率弛豫）。该损耗角正切（TAN δ对于气相二氧化硅纳米颗粒的不同频率和浓度，已经确定了电解液体系中的）。高导电性纳米复合凝胶聚合物膜的电化学稳定性窗口约为3.3 V，足以将该材料用作电化学装置应用的隔膜。电导率，介电常数，模量和电化学稳定性研究表明，钠离子导电纳米复合凝胶聚合物电解质具有良好的电化学性能，适用于任何电化学/功率转换装置。优化的柔性纳米复合凝胶聚合物电解质膜已用于原型钠电池，该电池表现出约2.1 V的稳定开路电势和约500 mAh g的显着的第一比放电容量^-1在14毫安g的漏极电流^-1。