碳量子点/聚环氧乙烷固态电解质的制备

Preparation of Carbon Quantum Dots/Poly(ethylene oxide)Solid Electrolytes

针对聚氧化乙烷(PEO)基固态电解质室温电导率较低的问题,通过在PEO中掺杂碳量子点(CQDs)作为填料,制备出不同CQDs含量的PEO基固态电解质,通过差示扫描量热分析技术、X射线衍射技术、扫描电子显微镜(SEM)技术等对其进行表征。结果表明:与PEO基固态电解质相比,掺杂CQDs的PEO基固态电解质的结晶度有明显的下降趋势;通过电化学阻抗测试(EIS)得出,PEO-LITFSI-5%CQDs固态电解质在室温下的离子电导率为2.01×10^(-5) S/cm,与PEO-LiTFSI-0%CQDs室温下的离子电导率相比,有明显的提升。

To address the problem of low room temperature conductivity of polyethylene oxide(PEO)based solid electrolytes,PEO based solid electrolytes with different content of CQDs were prepared by doping carbon quantum dots(CQDs)in PEO as fillers,which were characterized by differential scanning calorimetry,X-ray diffraction and scanning electron microscopy(SEM).The results show that compared with PEO based solid electrolytes,the crystallinity of PEO based solid electrolytes doped with CQDs shows a significant downward trend.According to electrochemical impedance spectroscopy(EIS),the ion conductivity of PEO-LITFSI-5%CQDs solid electrolytes at room temperature is 2.01×10^(-5) S/cm,which is a significant improvement compared with the ionic conductivity of PEO at room temperature.