通过s-d块高合金反向调制碳界面电子密度,提高了Li-S电池的性能
Yanjuan Li1, Qingzhao Chen1, Zhanzhan Wang1
1School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, Jiangsu, 221116, P.R. China.
Angewandte Chemie (International ed. in English)
|September 24, 2025
概括
这项研究引入了一种使用高合金的新方法,用于精确控制硫电池的碳宿主材料. 这种方法提高了催化剂的性能和稳定性,提高了电池容量和寿命.
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:
- 碳材料对于硫电池至关重要,但由于固有的电子结构,它们对催化性能的控制有限.
- 将金属催化剂包装在碳中,阻碍了对表面原子和电子性能的精确操纵,影响了催化效率.
研究的目的:
- 开发一种通用战略,远程精确地操纵碳宿主电子结构.
- 通过改善催化剂-聚硫化物相互作用来提高硫电池的性能和稳定性.
主要方法:
- 使用s-d块高合金 (CoNiCuMnMg@C) 来诱导电子送和积聚在碳宿主中.
- 使用理论计算 (DFT) 和凯尔文探针力显微镜 (KPFM) 来分析电子结构的修改和相互作用.
- 研究聚硫化物在改性碳界面上的吸附行为.
主要成果:
- 高合金,特别是合金,降低了碳宿主的工作功能,提高了电子密度,促进了强大的Li+吸附.
- 聚硫化物在碳界面稳定,防止催化剂中毒并改善氧化还原动力学.
- CoNiCuMnMg@C催化剂显著增加了Li+扩散,并加速了多硫化物氧化还原反应,从而提高了电池性能.
结论:
- 使用高合金的新策略使先进的硫电池能够精确控制碳宿主的电子结构.
- 这种方法为通过利用远程电子操纵设计高效催化剂提供了一条新的途径.
- CoNiCuMnMg@C 阴极表现出优越的特异性容量和容量保留,突出了这种催化设计的潜力.
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