固态聚合物电解质具有柔韧性好和易于加工的优势, 可制备各种形状的固态锂电池, 杜绝漏液问题。但固态聚合物电解质存在离子电导率低以及对锂金属负极不稳定等问题。本研究以纳米金属-有机框架材料UiO-66为聚合物电解质的填料, 用于改善电解质的性能。UiO-66与聚氧化乙烯(poly(ethylene oxide), PEO)链上醚基的氧原子的配位作用以及与锂盐中阴离子的相互作用, 可显著提高聚合物电解质的离子电导率(25 ℃, 3.0×10 ^-5S/cm; 60 ℃, 5.8×10 ^-4 S/cm), 并将锂离子迁移数提高至0.36, 电化学窗口拓宽至4.9 V。此外, 制备的PEO基固态电解质对金属锂具有良好的稳定性, 对称电池在60 ℃、0.15 mA·cm ^-2电流密度下可稳定循环1000 h, 锂电池的电化学性能得到显著改善。

Solid polymer electrolytes (SPEs) with high flexibility and processability enable the fabrication of leak-free solid-state batteries with varied geometries. However, SPEs usually suffer from low ionic conductivity and poor stability with lithium metal anodes. Here, we propose nano-sized metal-organic framework (MOF) material(UiO-66) as filler for poly(ethylene oxide) (PEO) polymer electrolyte. The coordination of UiO-66 with oxygen in PEO chain and the interaction between UiO-66 and lithium salt significantly improve the ionic conductivity (3.0×10 ^-5 S/cm at 25 ℃, 5.8×10 ^-4 S/cm at 60 ℃) and transference number of Li ⁺ (0.36), widen the electrochemical window to 4.9 V (vs Li ⁺/Li), enhance the stability with lithium metal anode. As a result, the as-prepared Li symmetrical cells can continuously operate for 1000 h at 0.15 mA∙cm ^-2, 60 ℃. The results show that UiO-66 filler is effective to improve the electrochemical performance of polymer electrolyte.