在金属基分子复合体中定制协调微环境,以同质地催化Li─S电池反应
Qin Yang1, Jinhao Zhang2, Yunfeng Zhang1
1State Key Laboratory of Environment-Friendly Energy Materials, School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, China.
这项研究引入了新的基于铁的分子催化剂,通过解决聚硫化物穿和改善沉积来提高硫电池性能. 催化剂促进稳定的循环和高容量,克服了下一代电池的关键局限性.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 硫 (Li-S) 电池面临着诸如多硫化物运输,缓慢的氧化还原动力学和不稳定的沉积等挑战.
- 有机金属基分子通过催化机制调节硫和物种提供了潜在的解决方案.
研究的目的:
- 为Li-S电池开发均的基于金属的类分子催化剂.
- 研究金属中心类型 (Co与Fe) 和协调结构 (Fe-N2/Fe-N4) 在提高电池性能方面的作用.
主要方法:
- 合成和电解质合并均的基于金属的类分子催化剂 (Co-ETL和Fe-ETL).
- 用定制的协调微环境对Li-S细胞进行电化学表征.
- 对硫和物种吸附和扩散机制的分析.
主要成果:
- 基于Fe的催化剂 (Fe-ETL) 具有双Fe-N2/Fe-N4协调结构,与基于Co的催化剂相比,其表现优越.
- Fe-N2协调增强了硫和物种的吸附,而Fe-N4协调改善了的扩散.
- 优化的Fe-ETL能够在500个周期内在5.0°C下稳定循环,每个周期的降解率为0.03%.
- 高面积容量为6.4 mA h cm-2,在硫载荷为7.1 mg cm-2的情况下实现.
结论:
- 均的金属基类催化剂,特别是Fe-ETL,有效地减轻了多硫化物穿,并改善了Li-S电池中的阳极稳定性.
- 协调微环境的合理设计对于优化催化剂功能和实现高性能Li-S电池至关重要.
- 开发的催化剂是推进下一代高能量密度电池的有希望的战略.
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