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强大的基于MOF的复合固态电解质膜用于高性能金属电池

Pu Cheng^1,2, Shixiang Liu^1,2, Xingkai Jia^1,2

¹ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou 311215, PR China.

|April 4, 2025

概括

研究人员开发了一种灵活的复合膜,使用金属有机框架 (MOF) 和离子液体 (IL) 用于固态电解质. 这种基于MOF的膜为先进的电池提供了高离子导电性,机械强度和阻燃性.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
聚合物科学聚合物科学

背景情况:

固态电解质 (SSEs) 对于下一代电池至关重要,提供更高的安全性和能量密度.
开发具有离子导电性,机械完整性和电化学稳定性平衡的SSE仍然是一个重大挑战.
金属有机框架 (MOF) 由于其可调节的结构和高表面积,显示出作为SSE组件的希望.

研究的目的:

为固态电解质制造一个坚固,灵活的基于MOF的复合膜.
研究PVDF-HFP,UIO-66 (MOF) 和离子液 (IL) 对电解质性能的协同作用.
评估金属电池开发的复合膜的电化学和机械性能.

主要方法:

使用聚乙烯化物-六烯 (PVDF-HFP),UIO-66 MOF和离子液体构建一个复合膜.
将IL纳入MOF孔内,以创建连续的离子通道.
离子导电性,Li+转移数,电化学窗口,机械性能和界面稳定性的表征.
使用制造的SSEs组装和测试LiFePO4//Li电池.

主要成果:

复合膜实现了高离子导电性 (5.55 × 10−4 S cm−1).
观察到优良的机械性能,包括6.63MPa的抗拉强度和232%的延伸.
膜表现出良好的界面稳定性,具有稳定的Li/脱落和高的Li+转移数 (0.52).
组装的LiFePO4//Li电池显示出出色的速率能力和周期稳定性.

结论:

在PVDF-HFP矩阵中,MOF和IL的协同作用导致了优越的固态电解质性能.
开发的基于MOF的复合膜是高性能金属电池的有希望的候选者.
这项工作为制造基于MOF的先进复合SSE提供了一个可行的策略.

关键词:

卓越的综合性表现卓越的综合性表现金属电池电池是一种金属电池.金属-有机的框架.固态电解质固态电解质有协同的增强效应.

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