一个双金属金属有机框架衍生了MnS/CoS@C异构结构,增强了离子储存
Zongyuan Jiang1, Shaohui Li2, Yining Chen2
1Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou, 450001, P. R. China. Qunxu@zzu.edu.cn.
Nanoscale
|July 11, 2023
概括
一种新的硫化/硫化异质连接 (MnS/CoS@C) 通过改善离子运输和稳定性来增强离子电池. 这种复合材料在离子电容器中表现出色,突出了其储能潜力.
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:
- 硫化 (MnS) 是离子电池 (SIB) 的一个有前途的阳极,因为它具有很高的容量.
- 然而,Na+扩散不良和体积变化阻碍了它的性能.
- 开发基于MnS的先进材料对于下一代能源存储至关重要.
研究的目的:
- 为提高SIB性能,设计一种嵌入硫碳 (MnS/CoS@C) 的新型MnS/CoS异质连接.
- 研究异质连接和碳封装的协同效应.
- 评估复合材料在离子电容器 (SIC) 中的潜力.
主要方法:
- 通过二金属金属有机框架 (MOF) 的硫化合成的MnS/CoS@C复合物.
- 使用现场电化学阻抗光谱 (EIS),现场X射线衍射 (XRD) 和现场X射线光电子光谱 (XPS) 进行材料的特征.
- 制造了一种原型离子电容器 (SIC),使用复合材料作为阳极和碳纳米板作为阴极.
主要成果:
- MnS/CoS@C复合材料表现出极好的速率能力 (526.1 mA hg-1 在0.1 A g-1 ,273.7 mA hg-1 在10 A g-1).
- 经过1000次循环以5Ag-1的速度后,证明了长期稳定的循环性能 (214.8mAhg-1).
- 原型SIC实现了高能量密度 (120.7W / kg-1) 和功率密度 (12,250W / kg-1).
结论:
- 这种MnS/CoS@C复合物有效地克服了SIB中纯MnS阳极的局限性.
- 异质连接和碳框架的协同效应显著提高了电化学性能.
- 开发的材料显示出对高性能离子储能系统的巨大潜力.
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