独家的Se-O协调和Fe-doping补充:在Li-S电池中增强硫回氧的催化策略
Zhao Yang1, Yu Wang1, Jingchen Han1
1School of Chemical Science and Engineering, Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University, Shanghai, 200092, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|November 29, 2025
概括
这项研究引入了一种新的Fe-doped Co3O4电催化剂,用于硫电池的Se-O协调. 该材料增强了硫氧化还原动力学,并抑制了多硫化物穿,从而提高了高硫载荷细胞的稳定性和性能.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 硫电池 (LSB) 在高效的电催化剂中面临挑战,用于氧化还原动力学和抑制多硫化物 (LiPS) 穿.
- 过渡金属氧化物对LiPSs吸附有希望,但受到缓慢的Li2S转化的影响.
- 开发先进的催化剂对于高性能LSB至关重要.
研究的目的:
- 设计和制造一种工程电催化剂,用于LSB中增强硫氧化还原.
- 为了研究Fe-doping和Se-O协调在烯Co3O4.4中的协同效应.
- 改进LSB的电化学性能和循环稳定性.
主要方法:
- 通过蚀刻-碳化,制造一个交集的多孔纳米架构Fe0.1Co2.9O4-Se.
- 描述催化剂的结构,组成和电子特性.
- 在LSB中对催化剂进行电化学测试,包括循环稳定性和高硫负载测试.
主要成果:
- Fe0.1Co2.9O4-Se催化剂表现出增强的导电性和加强LiPSs吸附,这是由于Fe3+替代和Se-O协调.
- 催化剂促进了快速的Li2S核化,并降低了催化能障碍,导致了优越的催化活性.
- 在0.5°C的500个循环中,每个循环的超低容量衰变率为0.1054%的异常循环稳定性.
- 一个含硫量高 (6.1 mg cm-2) 的袋式电池和瘦电解质在40个循环后保留了4.8 mAh cm-2.
结论:
- 拟议的催化策略涉及独家Se-O协调和Fe-doping在Co3O4,为设计高性能LSB电催化剂提供了一条新的途径.
- 设计的纳米架构有效地促进了运输,并暴露了活跃区域,提高了电池的性能.
- 这项工作为硫电池的实际应用提供了重大进展.
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