为金属电池设计基于金属有机框架的固态电解质的d-轨道能量
Yin Zhou1, Junjie Chen1, Jing Sun1
1Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
Nano letters
|January 31, 2024
概括
用NO2组功能化金属有机框架 (MOF) 提高了固态电解质 (SSE) 中的离子导电性. 这项研究将Zr d轨道能量与金属电池 (LMB) 的改善离子传输联系起来.
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
- 固态化学 固态化学
背景情况:
- 了解金属有机框架 (MOF) 的电子结构对于它们在金属电池 (LMB) 中作为固态电解质 (SSE) 的应用至关重要.
- 在基于MOF的SSE中,中心金属的电子状态与Li+离子导电性之间的关系仍然是一个重大挑战.
研究的目的:
- 研究Zr 3d轨道的d波段能量与功能化UiO-66 MOF中的Li+离子导电性之间的相关性.
- 基于d轨道能量,为LMB设计高效的SSE建立描述符.
主要方法:
- 功能化的UiO-66的合成,特别是NO2装饰的UiO-66 (NO2-UiO-66).
- 电子结构的分析,重点是Zr 3d轨道及其与阳离子的相互作用.
- 在合成的MOF中评估Li+离子导电性.
主要成果:
- 提取电子的NO2组增加了NO2-UiO-66.6中的Zr 3d轨道的能量.
- 高能Zr 3d轨道和 (ClO4-) 的O 2p轨道之间的混合导致抗结合轨道能量降低.
- 由于轨道杂交,强离子吸附使离子固定,并增强Li+离子导电性.
结论:
- 中心金属的电子状态,特别是Zr d轨道能量,直接影响MOF SSEs中的+离子导电性.
- MOF的功能化可以调整d轨道能量,以优化LMB的SSE性能.
- 在d轨道能量和离子导电性之间的相关性可以作为下一代SSE的设计原则.
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