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MOF-74 (M) (M=Mg (II),Fe (II),Ni (II)) 框架,使-S电池能够加速氧化还原动力学

D Capková^1,2, T Kazda², N Király³

¹Department of Chemical Sciences, Bernal Institute, University of Limerick, Limerick, V94 T9PX, Ireland.

Scientific reports

|November 3, 2025

概括

这项研究开发了一种用于硫 (Li-S) 电池的复合电极,使用MOF-74与Ni(II) 离子. S/MOF-74 (Ni) 电极表现出极好的稳定性和容量保留,在先进的Li-S电池应用中表现优于其他金属离子.

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
储能储能储能储能储能储能

背景情况:

硫 (Li-S) 电池在理论上具有很高的能量密度,但其性能受到限制.
金属有机框架 (MOF),特别是MOF-74,为增强Li-S电池电极提供了一个有希望的平台.
在MOF-74中选择中心金属离子可以显著影响硫相互作用和电极稳定性.

研究的目的:

为了合成和表征MOF-74结构与Ni (II),Mg (II) 和Fe (II) 金属离子用于Li-S电池应用.
研究MOF-74中不同中心金属离子对硫基电极的电化学性能的影响.
为优化Li-S电池电极材料建立结构性能相关性.

主要方法:

包含Ni (II),Mg (II) 和Fe (II) 金属离子的MOF-74结构的溶热合成.
使用光谱 (IR,XPS),热分析 (TGA),显微镜 (SEM) 和衍射 (XRD) 进行全面的材料表征.
电化学性能评估,包括容量保留,循环稳定性和硫复合物电极的速率能力.

主要成果:

MOF-74 ((Ni) 表明与硫的相互作用最强,XPS分析证实了这一点.
S/MOF-74 (Ni) 电极表现出卓越的电化学性能,达到465mAh的可逆容量,在200个周期内保持99.75%.
MOF-74 (Mg) 显示出最高的热稳定性,而MOF-74 (Ni) 则为Li-S电池提供了最佳的电化学性能和稳定性.

结论:

MOF-74 ((Ni) 是Li-S电池电极的一个非常有前途的材料,因为它具有有效的硫固定和优越的电化学特性.
在MOF-74中的中心金属离子在确定基于硫的电极的性能和稳定性方面发挥着至关重要的作用.
这项研究为开发先进的Li-S电池材料提供了对结构性能关系的宝贵见解.

关键词:

储能储能是指储能过程中的能量.硫电池是硫电池的一种.在MOF-74中使用.金属有机框架结构硫阴极是一种硫阴极.

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