一个集成的"刚性-灵活性"战略侧链工程向高离子导电阴离子共价有机框架电解质
Jian Song1, Li Lin1, Fengchao Cui1
1Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education, Faculty of Chemistry, Northeast Normal University Changchun 130024 China wanghg061@nenu.edu.cn tianyy100@nenu.edu.cn.
Chemical science
|July 26, 2024
概括
研究人员开发了一种新的固态电解质,使用固态金属电池的"刚性-灵活"阴性共价有机框架 (EO-BIm-iCOF). 这种材料增强了离子运输,提高了电池在不同温度下的性能.
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
- 聚合物化学 聚合物化学
背景情况:
- 固态金属电池 (SSLMBs) 需要先进的固态电解质 (SSEs) 进行稳定和快速的离子传输.
- 设计在不同气候条件下有效运行的SSE仍然是一个重大挑战.
研究的目的:
- 为SSLMB中SSE应用开发一种具有集成"刚性-灵活性"双重功能的新型阴性共价有机框架 (EO-BIm-iCOF).
- 研究刚性框架和柔性链对离子运输和电池性能的协同效应.
主要方法:
- 一个"刚性-灵活"的双重功能阴离子共价有机框架 (EO-BIm-iCOF) 的合成.
- 电解质的特性,包括Li+导电性和离子转移数.
- 使用LiFePO4阴极和开发的SSE.使用SSLMB的组装和测试.
- 分子动力学 (MD) 模拟以阐明离子运输机制.
主要成果:
- 开发的LITFSI@EO-BIm-iCOF SSE在室温下表现出1.08 × 10-4 S cm-1的高Li+导电性和0.69的离子转移数.
- 刚性框架和柔性氧化乙烯链的协同效应促进了盐分离,增强了离子传输.
- 组装的SSLMB在高温和低温下表现出相当好的电化学性能.
- MD模拟提供了关于SSE内的离子扩散和传输机制的见解.
结论:
- 这种"刚性-灵活性"的双重功能策略在为SSLMB设计先进的SSE方面是有效的.
- 阴离子共价有机框架显示了未来固态电池应用的巨大潜力.
- 开发的电解质为在广泛的温度范围内运行的高性能电池提供了有希望的途径.
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