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对于高性能金属电池的电离子共价有机框架修改型聚烯分离器

Juanqi Zhong¹, Yongfen Tong¹, Lin Guo¹

¹School of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang, 330063, China.

ACS applied materials & interfaces

|October 7, 2024

概括

阴离子共价有机框架 (COF) 通过提高湿透性和热稳定性来增强电池分离器. 这种修改促进了离子运输,并抑制了树突的生长,从而提高了电池的性能和寿命.

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:

分离器的湿透性和热稳定性对于电池的性能至关重要.
现有的商用分离器具有较低的离子选择性和不良的热稳定性,限制了电池的效率和可靠性.
阴离子共价有机框架 (COF) 提供了分离器修改的潜力.

研究的目的:

为修改聚烯 (PP) 分离器设计和合成阴阳性COF (Br-COF和TFSI-COF).
研究这些修改后的分离器对离子传输,阳极稳定性和电池整体性能的影响.
为下一代金属电池探索阴离子COF修饰分离器的潜力.

主要方法:

设计和合成两种含有伊米达类阴性有机基架 (Br-COF和TFSI-COF) 的设计和合成.
商用聚烯 (PP) 分离器的修改,使用合成的阴离子COFs.
分子动力学模拟用于研究离子解离和离子运输.
对LiFePO4/TFSI-COF@PP/Li电池进行电化学测试.

主要成果:

阴离子COF有效地解离盐离子集群,促进离子运输.
静电相互作用结溶剂离子,减少副作用反应,形成有利的富含LiF的固体电解质介相 (SEI) 层.
修改后的分离器表现出更好的湿透性和离子传输,抑制了树的生长.
该LiFePO4/TFSI-COF@PP/Li电池的初始容量高 (在0.5°C时148.0mAhg-1),库伦比效率优异 (98.0%),循环稳定性良好 (在100个循环后保持82.0%).

结论:

阴离子COF修饰分离器通过改善离子传输和阳极稳定性,显著提高电池性能.
开发的分离器显示出抑制树生长的潜力,并使金属电池可靠运行.
这项研究为开发用于高性能下一代金属电池的先进分离器提供了有前途的战略.

关键词:

阴离子共价有机框架金属电池是金属电池的一种.分离器的修改分离器的修改固体电解质相间阶段稳定的稳定性稳定的稳定性

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