溶解的多硫化物和潜在的催化主体材料之间的化学相互作用为Li-S电池
Dong Zheng1, Dantong Qiu1, Miao Liu1
1Department of Mechanical Engineering, College of Engineering and Applied Science, University of Wisconsin Milwaukee, Milwaukee, Wisconsin 53211, United States.
ACS applied materials & interfaces
|March 30, 2024
概括
研究人员对44种材料进行了硫电池阴极选. 20种材料与聚硫化物显著相互作用,这对于通过减轻穿效应来提高电池性能至关重要.
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
- 电池技术 电池技术
背景情况:
- 硫 (Li-S) 电池需要导电的主体材料,以有效地传输电荷,因为元素硫 (S8) 和硫化 (Li2S) 的绝缘性.
- 由循环过程中聚硫化物形成引起的"聚硫化物穿"效应阻碍了Li-S电池的性能,需要有效的缓解策略.
- 主体材料在通过物理或化学相互作用解决聚硫化物穿中发挥着至关重要的作用.
研究的目的:
- 质量和数量评估聚硫化物与44种不同的碳和无机宿主材料之间的相互作用.
- 确定可以有效减轻 Li-S 电池中聚硫化物穿效应的材料.
- 了解宿主材料和多硫化物之间的相互作用的主要机制.
主要方法:
- 利用高性能液态染色学 (HPLC) 进行聚硫化物种的定性和定量分析.
- 用44种不同的碳和无机材料进行化后,对聚硫化物溶液的监测变化.
- 分析了色谱结果,以确定材料-聚硫化物相互作用的程度和性质.
主要成果:
- 在44种测试材料中,有20种材料与聚硫化物显著相互作用.
- 确定的主要相互作用机制是不可逆转的不成比例反应.
- 观测到元素硫是这种不成比例反应的产物.
结论:
- 特定碳和无机材料可以有效地与聚硫化物相互作用,为Li-S电池的穿效应提供潜在的解决方案.
- 已识别的材料,特别是那些导致不成比例的材料,是开发先进硫阴极的有希望的候选材料.
- 了解这些相互作用是设计稳定和高性能硫电池系统的关键.
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