双离子增强的阴极-电解质介面,用于稳定转换型阴极
Aodi Li1,2, Hongyu Liu3, Zhicheng Wang2,4
1School of Nano Science and Technology, University of Science and Technology of China, Suzhou 215123, China.
ACS applied materials & interfaces
|May 27, 2025
概括
这项研究引入了一种新的离子液体电解质,用于稳定高能电池中的二硫化铁 (FeS2) 阴极. 新的电解质显著改善容量保留和周期稳定性,解决了聚硫化物穿效应.
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:
- 石 (FeS2) 是一个有希望的高能量密度电池的阴极材料.
- 聚硫化物穿效应导致FeS2电池的容量迅速下降.
- 先进的电解质设计对于提高电池性能至关重要.
研究的目的:
- 开发一种非易燃的局部缩离子液体电解质 (LCILE) 用于/FeS2电池.
- 为了减轻FeS2阴极中的聚硫化物穿效应.
- 为了提高/FeS2电池的循环稳定性和能量密度.
主要方法:
- 使用LiFSI,AMImTFSI和TTE制定一个LCILE.
- 研究电解质的溶解结构和离子聚合.
- 对FeS2阴极上阴极电解质间相 (CEI) 形成的分析.
- /FeS2电池的电化学循环,以评估性能.
主要成果:
- 在LCILE展示了一个量身定制的溶解结构与FSI-TFSI双离子主导聚合物 (AGGs).
- AGG有效地抑制了聚硫化物穿效应.
- 在FeS2阴极上形成了一个强大的双离子衍生CEI.
- /FeS2电池在200个循环后实现了627 mAh g-1,容量保留90%.
结论:
- 开发的LCILE显著提高了FeS2阴极的周期稳定性.
- 这种电解质设计为未来高能量密度Li/FeS2电池提供了一个有前途的战略.
- 这些发现为设计用于转换型电池材料的先进电解质提供了洞察力.
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