通过低温传输电子显微镜解硫化聚烯二电池中依赖电解质的介相结构
Cheng Zhen1,2,3, Xianbin Wei1,2, Yuxuan Cui3
1Eastern Institute for Advanced Study, Eastern Institute of Technology, Ningbo, Zhejiang 315200, P. R. China.
ACS nano
|February 3, 2026
概括
硫电池的性能取决于相间层. 使用添加剂或局部高度电解质形成的富含无机界相通过阻断分解来增强稳定性.
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:
- 硫 (Li-S) 电池具有高能量密度,但在阴极稳定性和电解质兼容性方面面临挑战.
- 了解固体电解质介面 (SEI) 和阴极电解质介面 (CEI) 对于Li-S电池的性能至关重要.
- 超细相间结构与Li-S电池性能之间的相关性仍未得到充分研究.
研究的目的:
- 为了比较5种不同的电解质形成的SEI和CEI结构,用于Li-S电池.
- 为了将相间特性与电池性能和故障机制相关联.
- 为Li-S电池的合理电解质设计提供指导方针.
主要方法:
- 低温传导电子显微镜 (cryo-TEM) 用于可视化超细的相间结构.
- 电子能量损失光谱 (EELS) 用于介面相的元素和化学状态分析.
- 用各种电解质对Li-S细胞进行电化学测试.
主要成果:
- 基线以和以太为基础的电解质导致过早失效,原因是厚厚的,不均的间相层和持续的电解质分解.
- 形成膜的添加剂通过创建含有无机丰富的介面相来提高循环稳定性,但导致副产品聚合.
- 局部化的高度电解质与含有凝结无机物种的紧SEI和CEI层产生了更好的稳定性.
结论:
- 电解质分解和相间厚度是导致Li-S电池故障的关键因素.
- 由添加剂或特定电解质组合物形成的富含无机基的接相增强了稳定性.
- 阳离子或添加剂在形成有益的有机丰富的介面中起着至关重要的作用,指导未来的电解质设计.
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