ABSTRACT

Solid polymer electrolytes (SPEs) have been widely studied due to its extensive applications in high energy rechargeable batteries, supercapacitors, fuel cells, photoelectrochemical and electrochromic displays. Herein, SPEs based on polyvinyl pyrrolidone (PVP) doped with cesium aluminate (CsAlO₂) nanoparticles (NPs), lithium perchlorate (LiClO₄) as an electrolyte and varying amounts viz., 2, 4, 6 and 8 wt.% of ethylene carbonate (EC) as plasticizer have been fabricated by solution intercalation technique. The structural features of PVP-CsAlO₂-LiClO₄-EC SPEs have been studied by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. The morphology of PVP-CsAlO₂-LiClO₄-EC SPEs has been examined by scanning electron microscopy (SEM). The thermal properties of the SPEs were characterized by the thermogravimetric analyzer (TGA) and differential scanning calorimeter (DSC) techniques. The TGA and DSC results revealed that a significant reduction in thermal stability and glass transition temperature (T_g) of PVP with an increase in EC content in SPE films. The optoelectrical properties of PVP-CsAlO₂-LiClO₄-EC SPE films have been evaluated using UV–visible spectroscopy. The band gap energy (E_g) was found to decrease with an increase in EC content, exhibiting a minimum of 4.23 eV for PVP-8 wt.% CsAlO₂-15 wt.% LiClO₄-8 wt.% EC. This could be ascribed to the formation of localized states and increased degree of disorder in the PVP-CsAlO₂-LiClO₄ SPE films. The integrated plasticizers increase the values of refractive index (RI), optical conductivity, and dielectric constants of PVP-CsAlO₂-LiClO₄ SPE films. The AC conductivity of the SPEs has been evaluated at room temperature using digital LCR meter in the frequency range 100 Hz – 5 MHz. The conductivity strongly depends on CsAlO₂ NPs and EC plasticizer content in SPEs.

摘要

固体聚合物电解质（SPE）由于其在高能可充电电池，超级电容器，燃料电池，光电化学和电致变色显示器中的广泛应用而被广泛研究。在此，基于聚乙烯吡咯烷酮（PVP）的SPEs掺杂有铝酸铯（CsAlO ₂）纳米颗粒（NPs），高氯酸锂（LiClO ₄）作为电解质，并掺有2、4、6和8 wt％的乙烯通过溶液插层技术制备了碳酸酯（EC）作为增塑剂。通过X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）研究了PVP-CsAlO ₂ -LiClO ₄ -EC SPE的结构特征。PVP-CsAlO ₂ -LiClO ₄的形态-EC SPEs已通过扫描电子显微镜（SEM）进行了检查。通过热重分析仪（TGA）和差示扫描量热仪（DSC）技术对SPE的热性能进行了表征。TGA和DSC结果表明，随着SPE膜中EC含量的增加，PVP的热稳定性和玻璃化转变温度（T _g）显着降低。PVP-CsAlO ₂ -LiClO ₄ -EC SPE膜的光电性能已使用紫外可见光谱法进行了评估。发现带隙能量（E _g）随着EC含量的增加而降低，对于PVP-8 wt。％CsAlO ₂ -15 wt。％LiClO ₄表现出最小4.23 eV-8重量％EC。这可能归因于PVP-CsAlO ₂ -LiClO ₄ SPE膜中局部状态的形成和无序度的增加。集成的增塑剂可提高PVP-CsAlO ₂ -LiClO ₄ SPE膜的折射率（RI），光导率和介电常数。SPE的交流电导率已在室温下使用数字LCR表在100 Hz – 5 MHz的频率范围内进行了评估。电导率很大程度上取决于SPE中的CsAlO ₂ NP和EC增塑剂含量。