通过电子旋转操纵促进聚硫化物氧化反应.
Jing Yu1,2, Chen Huang2,3, Oleg Usoltsev4
1Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, 08193 Bellaterra, Barcelona, Catalonia, Spain.
ACS nano
|July 9, 2024
概括
在CoSe纳米板中通过空隙引入旋转极化,通过改善聚硫化物吸附和催化活性,显著提高硫电池性能.
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
- 催化剂是一种催化剂.
背景情况:
- 硫电池 (LSB) 对下一代能源存储充满希望.
- 催化剂添加剂对于加速LSB中的-硫氧化还原反应至关重要.
- 目前的添加剂设计侧重于电荷分布,但电子旋转配置的作用未得到充分探索.
研究的目的:
- 调查电子旋转配置对LSB添加剂中多硫化物吸附和催化活性的影响.
- 探索缺陷工程,特别是CoSe纳米片中的Co vacancies,以操纵旋转极化.
- 为了证明改变自旋状态如何提高LSB性能.
主要方法:
- 合成的CoSe纳米片与工程 (Co) 的空缺.
- 利用缺陷工程来诱导自旋两极化并改变电子自旋状态分布.
- 分析了这些变化对聚硫化物吸附和Li-S氧化还原反应动力学的影响.
- 使用修改后的CoSe添加剂制造并测试了LSB阴极.
主要成果:
- 引入Co空位造成了自旋两极化,增加了不配对,对齐的电子.
- 增强的旋转配置改善了聚硫化物吸附,并减少了Li-S氧化还原反应激活能量.
- 实现了更均的Li2S核和生长,加速了液体-固体转换.
- 证明了高可逆容量 (1°C时1089mAhg-1) 和出色的循环稳定性 (0.017%的容量损失/1500个循环).
- 高硫载荷电池表现出优异的性能 (5.2 mA h cm−2 与0.16%的衰变/周期).
结论:
- 电子旋转配置是设计LSB中有效的催化添加剂的关键参数.
- 缺陷工程,特别是创造空缺,是调整旋转状态以提高电池性能的一种可行的策略.
- 开发的具有工程空缺的CoSe添加剂为推进高性能硫电池提供了有前途的途径.
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