聚偏氟乙烯准固态电解质薄膜的制备及性能研究

Preparation and characterization of quasi-solid-state electrolyte films based on poly vinylidene fluoride

以聚偏氟乙烯(PVDF)为凝胶剂、DMF为溶剂,用旋涂法制备了PVDF聚合物薄膜.采用扫描电镜、电化学交流阻抗、线性扫描伏安法分别对PVDF薄膜的微观形貌、准固态电解质的电导率及其组装的染料敏化太阳能电池(DSSCs)的输出电流-电压性能进行表征.测试结果表明:PVDF与DMF的质量比及匀胶机转速,影响PVDF膜的微观形貌及吸液性能,从而影响准固态电解质的电导率及DSSCs的光电性能.当mPVDF∶mDMF=1∶8,匀胶机转速为2 500 r/min时,DSSCs的综合性能较好,其开路电压为0.726 V,短路电流密度为9.96 mA·cm-2,光电转换效率为3.10%.

The polymeric membranes were prepared via spin coating method,which was synthesized with polyvinylidene pluoride（ PVDF） as gel,N,N-dimethyl formamide（ DMF） as solvent. The micro-morphology of polymer membranes,and conductivity of quasi-solid-state electrolytes and the output current-voltage（ I-V） properties of the cells were characterized by scanning electron microscopy（ SEM）,electrochemical impendance spectroscopy（ EIS） and linear sweep voltammetry（ LSV）. The results showed that the mass ratio of PVDF and DMF,and the rotation rate of spin coating influenced the mesh morphology and the absorbent properties of the polymeric membranes,which influenced the quasi-solid-state electrolyte ionic con-ductive performance and the photoelectric performance of the DSSCs. When the rotating speed of spin coating machine was fixed at 2 500 r /min and the mass ratio of PVDF and DMF was 1∶8,the comprehensive performance of DSSCs was better. The open circuit voltage（ Voc）,short circuit current（ Jsc） and conversion efficiency（ η） showed the values of 0. 726 V,9. 96 mA·cm- 2and 3. 10%,respectively.