高性能复合固态电解质的制备及固态锂金属电池性能研究

固态锂金属电池相较于传统液态电池，其能量密度更高、安全性更好，具有巨大的应用前景。但聚合物固态电解质离子电导率低、强度低、电化学稳定性差，阻碍了其进一步发展。将丁二腈与聚碳酸丙烯酯通过无溶剂法加以玻璃纤维作为支撑制备了室温下高性能的复合固态电解质。所制备的复合固态电解质在室温下离子电导率达3.06×10^?4 S/cm，锂离子迁移数达0.47，电化学窗口最高达4.3 V；其锂金属对称电池在电流为0.1 mA/cm²的条件下，稳定循环超400 h；磷酸铁锂固态锂金属电池0.5 C循环100次的容量保持率为95.9%，展现出良好的循环稳定性。

Preparation of high-performance composite solid electrolytes and research on the performance of solid-state lithium metal batteries

Compared to traditional liquid batteries, solid-state lithium metal batteries offer higher energy density and improved safety, presenting significant potential for applications. However, the development of polymer solid electrolytes is hindered by their low ionic conductivity, weak mechanical strength, and poor electrochemical stability. This paper introduces an ambient-temperature high-performance composite solid electrolyte through a solvent-free method, combining succinonitrile and propylene carbonate. The composite solid electrolyte membrane is fabricated using glass fiber membrane as reinforcement. This electrolyte exhibits an ionic conductivity of 3.06×10^?4 S/cm and a Li⁺ transference number of 0.47 at room temperature, with an electrochemical window up to 4.3 V. Li|Li symmetric cells operated at 0.1 mA/cm² demonstrate stable cycling for over 400 h. Moreover, LFP|Li cells cycled 100 times at 0.5 C show a capacity retention rate of 95.9%, indicating impressive cycle stability.