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工程4 - 连接3D共价有机框架与面向+通道,用于金属电池中的高性能固态电解质

Yanan Zhang^1,2, Chi Shan^1,2, Zhuo Chen^1,2

¹Key Laboratory of Chemical Additives for China National Light Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)

|April 22, 2025

概括

新的共价有机框架 (COF) 提高了稳定的金属电池的固态电解质中的离子导电性. 这些材料改善了离子运输和阳极稳定性,使电池性能持久.

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) 对于高性能金属电池 (LMB) 是至关重要的.
聚合有机框架 (COF) 由于其结构和可调性,具有作为离子导体的潜力.
现有的COF在活性点和细分运动方面面临限制,阻碍了离子导电性.

研究的目的:

设计和合成新的3D多孔COF框架,以改善SSE中的Li+运输.
为了提高LMB中的阳极的稳定性和性能.
研究控制COF中的Li+导电的结构-属性关系.

主要方法:

使用线性二极管单体的3D多孔COF框架 (TP-COF和TB-COF) 的合成.
合并COF与聚合物电解质形成SSEs.
SSE的电化学表征,包括离子导电性和Li+转移数的测量.
使用LiFePO4 (LFP) 阴极和Li金属阳极进行细胞组装和循环测试.
分子动力学模拟和COMSOL多物理模型.

主要成果:

结核病COF表现出优越的Li+导电 (8.89 × 10-4 S cm-1) 和高转移数 (0.80) 由于较大的毛孔和丰富的活性点.
PEO-TB-COF SSEs在1 mA cm-2下表现出超过1000小时的稳定性,并在LFP红色白色Li细胞中经过800个周期后保持90%的容量.
富含LiF/Li3N的固体电解质间相 (SEI) 促进了均的沉积.
模拟证实了扩展的Li+运输通道和减少的界面障碍,有助于提高性能.

结论:

开发的3D多孔COF,特别是TB-COF,显著增强Li+运输和稳定LMB中的阳极.
对COF架构和活性站点的合理设计是克服离子导电性的局限性的关键.
这些发现为下一代高性能和安全的金属电池的先进SSEs铺平了道路.

关键词:

金属电池电池的使用情况 + 和 Na+ 离子导电性.协价有机框架协价有机框架孔隙结构设计的结构设计.固态电解质固态电解质

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