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从无电解质的电极上的固体电解质间相的形成和演变

Zijie Lu¹, Tamara Patranika², Andrew J Naylor²

¹Univ. Grenoble Alpes, CEA, IRIG, MEM, Grenoble, 38054, France.

Small (Weinheim an der Bergstrasse, Germany)

|January 6, 2025

概括

这项研究揭示了离子电池循环期间固体电解质介相 (SEI) 层的"呼吸"行为. 乙碳酸盐 (VC) 添加剂提高了SEI的稳定性,并减少了无电解质中的被困.

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:

对于可持续的储能解决方案的需求日益增长.
在离子电池中需要环境兼容的电解质.
二氧化 (LiBOB) 作为一个有前途的无电解质成分.

研究的目的:

使用基于LiBOB的电解质,研究Si晶片上的SEI形成和演变.
阐明乙烯碳酸盐 (VC) 添加剂对SEI特性和循环稳定性的影响.
了解Si晶片 (去化) 过程和捕获机制.

主要方法:

操作X射线反射率 (XRR) 用于现场结构分析.
外置X射线光电子光谱 (XPS) 用于表面化学表征.
使用LiBOB电解质的Si晶片模型系统的循环,带有和没有VC.

主要成果:

确定了三个不同的SEI进化阶段:形成,密集/生长,以及在脱过程中减少厚度 (SEI呼吸).
VC添加剂减轻了LiBOB分解,并促进了更光滑的SEI层.
观察到在Si晶片中的捕获,通过VC添加减少.

结论:

这项研究为LiBOB电解质的SEI行为提供了基本的结构和化学见解.
证明了VC在增强SEI稳定性和减少损失方面的有益作用.
为设计更安全,更高效,更环保的离子电池提供了意义.

关键词:

运行X射线反射效率的操作.射线光电子光谱学X射线光电子光谱没有的电解质.离子电池是一种离子电池.电极是一种电极.固体电解质相间阶段

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