通过双原子工程为高性能Li-S电池中增强的多硫化物转换进行现场特定的氧化催化
Kaiyuan Zhang1, Lekang Cui1, Lang Liu2
1State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China.
ACS nano
|September 17, 2025
概括
研究人员开发了一种用于硫 (Li-S) 电池的双原子催化剂. 这种催化剂增强了硫减少和演化反应,改善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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 硫 (Li-S) 电池面临的挑战是聚硫化物穿和缓慢的氧化还原动力学.
- 现有的电催化剂难以同时管理减少硫 (SRR) 和硫演化 (SER) 反应.
研究的目的:
- 设计一种先进的电催化剂,可以解并促进不同的SRR和SER通路.
- 为提高Li-S电池性能,设计一个特定站点的双原子催化剂.
主要方法:
- 原子级工程创建一个Ni-Mo双原子催化剂 (DAC).
- 实验性表征和理论计算,以了解催化机制.
- 在Li-S电池电池中应用Ni-Mo DAC.
主要成果:
- Ni-Mo DAC表现出特定地点的活动:Ni促进了聚硫化物转化,Mo促进了Li2S分解.
- 在DAC中增强的轨道合和电子重建使协调的氧化还原调制成为可能.
- Ni-Mo DAC 实现了高速率容量 (770.3 mAh g-1 在 5.0C) 和出色的稳定性 (0.033% 色/周期超过 1000 个周期).
结论:
- Ni-Mo DAC有效地解决了Li-S电化学中的动力不对称性.
- 这项工作提出了一个合理的策略,用于为先进的电池创建氧化还原协调的催化接口.
- 催化剂在苛刻的条件下表现出卓越的性能,包括高硫负载和广泛的温度范围.
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