对称与非对称阻碍离子分解路径及其对固体电解质间相稳定性对Si阳极的影响
Abinaya Sankaran1, Fathima Laffir1, Giovanna Maresca2
1Department of Chemical Sciences and Bernal Institute, University of Limerick, Castletroy, Limerick, V94T9PX, Ireland.
Angewandte Chemie (International ed. in English)
|December 2, 2025
概括
一项新的研究表明,离子液体电解质中的对称化硫胺离子在阳极上产生强大的固体电解质介相 (SEI). 这种稳定的SEI显著提高了离子电池的寿命和性能.
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
- 电池技术 电池技术
背景情况:
- 稳定的固体电解质间相 (SEI) 对离子电池 (LIB) 中的阳极的寿命至关重要.
- 传统的碳酸盐电解质产生不稳定的SEI,限制了Si阳极的实际使用.
- 基于化硫胺 (FSI-/TFSI-) 的离子液 (IL) 电解质为SEI形成和增强容量保留提供了有前途的替代方案.
研究的目的:
- 研究对称和不对称离子在指导基于IL的电解质中SEI形成和演变中的作用.
- 阐明离子分解路径和界面化学之间的机械相互作用.
- 了解IL电解质如何影响SEI特性和阳极性能.
主要方法:
- 研究了SEI化学和形态,使用各种基于imidazolium的ILs与对称和不对称的离子.
- 使用表面分析技术分析SEI成分 (例如LiF,LiOH,Li2SO4) 和结构.
- 与SEI特征相关的电化学性能 (容量保留,循环稳定性).
主要成果:
- 对称的 bis ((fluorinated sulfonyl) imide 离子与 imidazolium 相互作用,形成一个富含无机物的内部SEI (LiF/LiOH) 和一个Li2SO4/聚合物外层.
- 这种对3DSi阳极的合规SEI涂层增强了机械完整性和灵活性.
- 在250个循环中,在1C下达到2489mAh/g的可逆容量,证明了电池性能的提高.
结论:
- 对称的化硫胺基离子和伊米达酸盐的协同相互作用是形成强大的关键,多层的SEI.
- 由此产生的SEI有效地抑制了Si阳极粉碎,并提高了循环寿命.
- 这些发现为设计高性能LIB的先进离子液体电解质提供了关键的见解.
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