碳纳米管支持化物替代铁化 启用增强的多硫化物逆氧化转换动力学和循环稳定性
Jiaqi Zhao1, Zhanwei Xu1, Yujiao Zhang2
1Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi'an, 710021, PR China.
ChemSusChem
|August 21, 2024
概括
这项研究在碳纳米管 (FePcF16/CNTs) 上引入铁六甲基 (Hexadecafluorophthalocyanine),通过增强聚硫化物 (LiPS) 捕获和氧化还原动力学来提高硫 (Li-S) 电池性能. 这种新材料显著提高了产能和长期稳定性.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 硫 (Li-S) 电池具有高的理论能量密度,但受到缓慢的多硫化物 (LiPS) 过渡和穿效应的限制.
- 有效的捕获和LiPS的氧化还原动力学对于商业化Li-S电池至关重要.
研究的目的:
- 开发一种用于提高Li-S电池中的LiPS管理的新材料.
- 研究在碳纳米管 (CNT) 上支的铁六甲甲 (FePcF16) 在提高Li-S电池性能方面的作用.
主要方法:
- 在CNTs (FePcF16/CNTs) 上支持的10nm大小FePcF16的固体合成.
- 对于LiPS捕获效率和氧化还原动力学,FePcF16/CNTs的表征.
- 电化学性能测试包括初始容量,速率能力和长期循环稳定性.
- 放松时间分布 (DRT) 分析,以了解LiPS亲和力和Li+扩散.
主要成果:
- 由于Fe-N4单位和F功能组,FePcF16/CNTs表现出改善的LiPS捕获和加速的氧化还原动力学.
- DRT分析证实了强烈的LiPS亲和力和增强的Li+扩散,导致有孔的阴极表面.
- 实现了高初始容量 (在0.2°C时1136.2 mAh/g),优异的速率容量 (5°C时624.9 mAh/g) 和卓越的循环稳定性 (2°C时300个循环与0.043%/循环衰变).
结论:
- FePcF16/CNTs有效地减轻Li-S电池中的LiPS穿和缓慢动力学.
- 该材料的独特结构增强了LiPS相互作用和离子扩散,从而提高了电化学性能.
- 这一发展为推进高性能Li-S电池的商业化提供了一个有前途的战略.
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