嵌入孔多孔碳中的高热金属亚化物,使硫电池中的多硫化物转化成为可能
Ruirui Wang1,2, Jihuang Jiao1, Da Liu1
1Department of Materials Science, Fudan University, Shanghai, 200438, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|July 9, 2024
概括
在多孔碳中高的金属化物纳米晶体提高硫电池的性能. 这种新的阴极材料显著减少容量色,使长时间的高性能能量存储成为可能.
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:
- 硫 (Li-S) 电池面临着诸如由于多硫化物 (LiPS) 溶解度和缓慢的氧化还原动力学而导致的快速容量色等挑战.
- 有效的Li-S电池性能需要稳定的阴极材料,可以减轻这些问题.
研究的目的:
- 设计和合成一种用于高性能Li-S电池的新型硫主体材料.
- 为了解决 Li-S 电池的容量衰减和缓慢的氧化还原动力学问题.
主要方法:
- 一种易于使用的化伊米达酸框架 (ZIF) 驱动的吸附-化工艺被用于创建嵌入在化的孔多孔碳 (N-CPC) 多面体中的高的金属化物纳米晶体 (HEMN).
- 该HEMN/N-CPC复合材料的特点是其结构和电化学特性.
主要成果:
- 该HEMN/N-CPC复合体展示了优化的d频段中心,用于增强LiPS吸附和催化转化.
- 凸的多孔碳结构适应体积变化,限制活性点,加速硫氧化还原反应.
- 由此产生的硫阴极在0.2°C下产生1274mAh高特异性电容-1g,在1°C下1000个循环后,低容量衰变率为0.044%.
- 在5.0毫克厘米-2的高硫负载下,实现了5.0 mAh cm-2的面积容量.
结论:
- 开发的HEMN/N-CPC复合物作为有效的硫宿主,显著提高了Li-S电池的性能.
- 这项工作为设计下一代Li-S电池的先进阴极材料提供了新的策略.
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