高晶度 2D π-d 结合导电金属有机框架,用于促进硫电池中的多硫化物转化
Tong Guo1, Yichen Ding1, Chang Xu1
1Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, Nanjing University of Science and Technology, Nanjing, 210094, P. R. China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|July 28, 2023
概括
在硫 (Li-S) 电池中的金属有机框架 (MOF) 面临着挑战. 这项研究引入了Ni-HAB@CNT,一种2D导电MOF,通过抑制穿效应和加速转换动力学来提高Li-S电池的性能.
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:
- 金属有机框架 (MOFs) 对Li-S电池有希望,但受到孔径大小,导电性和硬质障碍的限制.
- 这些限制阻碍了聚硫化物 (LPS) 的相互作用,阻碍了催化性能.
研究的目的:
- 开发一种基于MOF的新型材料,以提高Li-S电池的性能.
- 为了解决Li-S电池的MOF中孔径大小,导电性和硬质障碍的挑战.
主要方法:
- 在碳纳米管 (CNT) 上将Ni(II) 离子和六氨 (HAB) 连接器在现场组装成Ni-HAB 2D导电MOF.
- 制造Ni-HAB@CNT作为Li-S电池的分离器修改层.
- 关于孔径大小和催化位点的Ni-HAB纳米结构的表征.
主要成果:
- Ni-HAB@CNT纳米结构呈现有序的微孔 (≈8 Å) 和密集的Ni-N4化学吸收点.
- 观察到有效抑制穿效应和加速的LPSs转换动力学.
- 在高硫负荷 (6.5毫克/厘米/秒) 的情况下,实现了6.29 mAh cm−2的面积容量,并在50个循环后达到791 mAh g−1的可逆容量.
结论:
- 经过Ni-HAB@CNT修改的分离器显著提高了Li-S电池的性能.
- 该材料的独特结构有效地减轻了MoF在Li-S电池应用中的关键限制.
- 展示了开发高性能Li-S电池的先进分离器的有希望的战略.
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