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作为高温K离子电池的稳定高容量阳极,具有卓越的氧化还原活性的导电金属有机框架

Menghua Yang¹, Xian Zeng¹, Mo Xie¹

¹College of Chemistry and Materials Science, Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Jinan University, Guangzhou 510632, China.

Journal of the American Chemical Society

|February 27, 2024

概括

一种新的多孔金属有机框架 (MOF) 能够在高温K-离子电池 (KIB) 中稳定地储存高容量. 这种MOF阳极在60°C时表现出异常的循环性和容量保留,克服了KIB阳极的不稳定性.

科学领域:

材料科学
电化学
能量储存

背景情况:

高温可充电电池对于在苛刻的环境中储存能量至关重要.
离子电池 (KIB) 由于的丰富性而具有吸引力,但在高温下阳极的不稳定性限制了性能.
现有的KIB阳极在高温操作下迅速丧失容量,阻碍了实际应用.

研究的目的:

为高温KIB开发稳定且高性能的阳极材料.
调查特定的有孔导电金属有机框架 (MOF) 对于高效的储存的潜力.
应对高温下KIB阳极的化学和机械不稳定性的挑战.

主要方法:

合成了一种多孔导电金属有机框架 (MOF),使用富含N的芳香分子和具有π-d结合的CuO4单元.
在60°C的KIB中测试MOF阳极的电化学性能,评估初始容量,速率能力和长期循环性.
进行了机制研究,以了解氧化还原活性位点和结构特征对电化学性能的贡献.

主要成果:

在60°C时,MOF阳极提供了455 mAh的高初始容量.
证明了令人印象深刻的速度性能和非凡的循环性,在1600个循环后保留了96.7%的容量.
MOF结构提供了丰富的氧化还原活性位点 (CN和CuO4),并促进了离子/电子运输.

结论:

与现有的材料相比,开发的MOF阳极对高温KIB具有更高的性能.
π-d 结合,多孔结构和氧化还原活性位点的协同效应确保了结构稳定性和高效的储存.
这种MOF是下一代高温储能解决方案的有希望的候选者.

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