在Mn-N3-Cl Moiety上确定Cl协调效应,以提高Li-S电池中的反应动力学和抑制效应
Yurong Yan1, Ning Fu2, Wei Shao1
1Shanghai Key Laboratory of D & A for Metal-Functional Materials, School of Materials Science and Engineering, Tongji University, Shanghai, 200092, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|March 28, 2024
概括
这项研究引入了一种用于硫 (Li-S) 电池的新型单原子催化剂 (SAC). 催化剂通过利用协调来提高多硫化物转化和减少穿,从而提高电池容量和稳定性,从而表现出更好的性能.
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
- 催化剂是一种催化剂.
背景情况:
- 单原子催化剂 (SAC) 对硫 (Li-S) 电池至关重要,增强聚硫化物 (LiPS) 转换并减轻穿.
- 由于复杂的微观结构,理解SAC中的结构-活动关系具有挑战性.
研究的目的:
- 在B,N-co-doped碳纳米管 (MnN3Cl@BNC) 上合成和研究一种具有Mn-N3-Cl部分的新型SAC.
- 阐明协调在Mn-N3-Cl活性位点的催化活性中的特定作用.
主要方法:
- 合成MnN3Cl@BNC和MnN3OH@BNC作为一个控制.
- 选择性去除Cl配体以研究其对催化性能的影响.
- 使用修改后的分离器对Li-S电池进行电化学表征.
主要成果:
- Mn-N3-Cl部分增强了电子密度,减少了带间隙,并改善了LiPS的吸附和氧化还原动力学.
- 经过MnN3Cl@BNC修改的分离器实现了高容量 (1384.1 mAh g-1在0.1C) 和卓越的循环稳定性 (在700个循环中每周期衰减0.06%).
- 性能明显超过了对照组 (MnN3OH@BNC).
结论:
- 协调对Mn-N3-Cl SACs的催化活性产生积极影响.
- 这一发现为设计用于Li-S电池的高性能SAC提供了新的策略.
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