激活散装Li2S作为硫电池的阴极材料,通过基于甲基甲基酸的氧化解调解化学
Qianqian Fan1, Yubing Si1, Fulong Zhu1
1College of Chemistry, Zhengzhou University, Zhengzhou, 450001, P. R. China.
Angewandte Chemie (International ed. in English)
|June 12, 2023
概括
二甲化物 (PDTe) 作为氧化还原媒介,加速电池中的硫化 (Li2S) 阴极动力学. 这种方法降低了激活能量,并减轻了多硫化物穿,提高了电池的性能.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 硫化 (Li2S) 是先进电池的有希望的阴极材料.
- 高激活能量 (Ea) 和聚硫化物穿阻碍了Li2S的商业化.
研究的目的:
- 为了研究加速散装Li2S氧化动力学,使用有机甲基素氧化还原介质.
- 为了降低激活能量屏障和Li2S阴极的初始超电位.
- 为了减轻聚硫化物在硫基电池中的穿效应.
主要方法:
- 系统地研究使用二甲化物 (PDTe) 作为氧化还原介质的反应动力学.
- 从散装Li2S中提取Li+的分析.
- 聚硫化物的共价定形成不溶性类硫化物 (PhTe-SxLi).
主要成果:
- PDTe显著降低了Li2S的Ea,降低了初始电荷潜力.
- 通过将可溶性多硫化物转化为不溶性物种,PDTe减轻了多硫化物穿.
- 体体Li2S-PDTe电池表现出极好的速度能力和循环稳定性.
- 这台SIBIDODISALi2S-PDTe全电池在0.2°C时实现了953.5mAhg-1的容量.
结论:
- 有机基化物氧化还原介质,特别是PDTe,可以有效地加速Li2S阴极动力学.
- PDTe提供了一种可行的策略,以克服Li2S电池技术的关键挑战.
- 这种方法提高了电池的性能,为商业化铺平了道路.
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