5.1微米离子调节的刚性半固体电解质,通过弥合金属电池的快速离子传输通道而构建
Yangxi Liu1, Suqing Wang1, Weicheng Chen1
1School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|April 29, 2024
概括
这项研究介绍了一种用于金属电池的新型,超薄准固体电解质,通过抑制树突的生长和改善离子导电性来提高安全性和性能.
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
- 纳米技术 纳米技术
背景情况:
- 高能量密度金属电池 (LMBs) 需要具有阻树特性的先进准固体电解质 (QSE).
- 目前的QSE面临着实现高刚性和离子导电性,以确保安全高效运行的挑战.
研究的目的:
- 为高能量密度LMBs开发一种超薄,刚性QSE.
- 提高QSE的稳定性和树抑制能力.
- 研究一种新的离子导电机制,以提高电池性能.
主要方法:
- 使用凯弗拉纳米纤维 (KANF) 和金属有机框架 (MOF) 颗粒制造5.1微米刚性QSE层.
- 封装一个非易燃的深溶解剂到MOF通道和现场聚合.
- 描述QSE属性,包括刚性,离子导电性和结构稳定性.
- 密度函数理论 (DFT) 计算以了解离子动力学.
主要成果:
- 开发的QSE具有高刚性 (5.4 GPa) 和离子导电性 (0.73 mS cm−1 在室温下).
- QSE在LMBs中表现出优异的树抑制和长期周期性表现.
- 在循环后,在金属表面上观察到统一的沉积形态.
- DFT计算证实了KANFs桥接MOFs在促进离子扩散方面的重要作用.
结论:
- 新型拓网络QSE为安全的LMB提供了强大而稳定的电解质系统.
- 构建的QSE能够使离子流同质化,并改善了离子调节的特性.
- 这项工作为设计具有新的离子导电模式的超薄,高性能电解质提供了有效的策略.
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