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高压单离子共价有机框架电解质,由酸迁移梯子为金属电池启用

Weiping Li^1,2, Shantao Han³, Chenxi Xiao^1,2

¹Department Division of Natural and Applied Sciences, Duke Kunshan University, Kunshan, Jiangsu, 215306, China.

Angewandte Chemie (International ed. in English)

|July 30, 2024

概括

一种新的基于阿扎尼德的单离子共价有机框架 (CN-iCOF) 提高了金属电池的性能. 这种材料提供了更好的离子导电性和高压稳定性,用于更安全,更节能的电池.

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:

金属电池中的固态电解质由于电化学稳定性差和离子导电性低而受到影响.
这些局限性阻碍了安全,高压和能量密集的金属电池的开发.

研究的目的:

设计一种新的单离子共价有机框架 (CN-iCOF),具有增强的Li+运输和高压稳定性.
为了利用亚基组的电子效应,提高电池性能.

主要方法:

密度函数理论 (DFT) 和分子动力学 (MD) 计算,以了解Li+运输机制.
通过施特克尔反应合成基于阿扎尼德的共价有机框架,以获得化.
在具有高压阴极的固态金属电池中对CN-iCOF进行电化学测试.

主要成果:

在CN-iCOF表现出超低的HOMO能量轨道和增强的Li+解离由于电子提取基组.
达到0.93的高离子转移率 (tLi+) 和高达5.6V的氧化稳定性.
在没有添加剂的情况下,在室温下证明的离子导电率为1.33×10^-5 S cm^-1.
通过LiNi0.8Mn0.1Co0.1O2阴极,实现了1100小时的稳定沉积和4.5V的可逆循环.

结论:

设计的CN-iCOF为稳定,高压固态金属电池提供了一个有前途的解决方案.
该研究强调了功能组工程在开发先进电池电解质方面的重要性.
这项工作为下一代高性能储能设备铺平了道路.

关键词:

化是指一种化物.的高压电机.电池是电池的使用方式.单离子共价有机框架固态电解质固态电解质

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