在MoS2/MXene上分散的单个Ru原子用于硫电池中增强的硫还原反应
Yanqun Bai1,2, Thanh Tuan Nguyen1, Hewei Song1
1Advanced Materials Institute of Nano Convergence Engineering (BK21 FOUR), Dept. of Nano Convergence Engineering, Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea.
Small (Weinheim an der Bergstrasse, Germany)
|May 25, 2024
概括
研究人员开发了一种新型的单原子化二硫化 (Ru-MoS2),在V2C MXene上装饰,作为硫电池的硫宿主. 这种先进的材料显著提高了聚硫化物定和转换动力学,提高了电池的性能和稳定性.
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:
- 硫电池 (LSB) 理论上具有较高的能量密度,但由于聚硫化物穿效应,其容量降低.
- 由于硫的利用率低下和周期寿命短,LSBs的商业化受到阻碍.
研究的目的:
- 为LSB开发一种新的硫宿主材料,以克服穿效应并提高电化学性能.
- 调查单原子Ru兴奋剂和MoS2/MXene缺陷的作用,以加强聚硫化物管理.
主要方法:
- 采用了一种新的相位工程策略,在V2C MXene (Ru-MoS2/MXene) 上合成单原子Ru-doped 1T/2H MoS2与富含缺陷.
- 合成的Ru-MoS2/MXene被用作LSB中的硫宿主.
- 评估了电化学性能,包括速度能力和循环稳定性.
主要成果:
- Ru-MoS2/MXene阴极在6°C时表现出684.3mAhg-1的高速能力.
- 实现了卓越的循环稳定性,在2°C的1000个循环后,每个循环容量降低仅为0.02%.
- 在高硫负载 (9.5 mg cm-2) 和精益电解质与硫比率 (4.3) 的情况下,保持了高726 mAh g-1的高放电容量.
结论:
- 单原子Ru兴奋剂和MoS2/MXene结构中的缺陷有效地定聚硫化物并加速反应动力学.
- Ru-MoS2/MXene材料显示出作为高性能和稳定的硫电池的先进硫宿主具有显著的潜力.
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