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在特定的SEI层的现场施工提供了有效的先化

Kaifa Zhang¹, Huiping Wang¹, Zishuo Feng¹

¹State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China.

ACS applied materials & interfaces

|July 12, 2024

概括

直接接触预改进了基于的阳极,通过构建一个稳定的固体电解质介相 (SEI) 层. 这提高了先进电池应用的初始库伦比克效率 (ICE) 和循环稳定性.

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
储能储能储能储能储能储能

背景情况:

基于的阳极为离子电池提供了高的理论容量.
低初始库伦比效率 (ICE) 和体积扩张限制了它们的商业用途.
直接接触预化是解决这些局限性的有希望的策略.

研究的目的:

调查直接接触预化对增强基于的阳极的有效性.
了解前化过程中形成的固体电解质介相 (SEI) 的作用.
为了提高SiO/C复合阳极的循环稳定性和初始库伦比克效率 (ICE).

主要方法:

SiO/C复合阳极的直接接触预化.
使用LiTFSI作为主要成分的电解质配方.
使用X射线光电谱学 (XPS) 和飞行时间二次离子质谱学 (TOF-SIMS) 进行表面分析.
使用NCM111阴极对全电池进行电化学性能测试.

主要成果:

使用基于LiTFSI的电解质构建了一个稳定的SEI层,主要由LiF组成.
预化过程被减缓,减少了局部电流和副作用.
在前化过程中,SiO/C阳极的体积膨胀被有效地抑制.
在1C的500个循环后,全细胞表现出83.5%的容量保留.

结论:

使用基于LiTFSI的电解质进行直接接触预化,成功地形成了富含LiF的保护性SEI层.
这一策略减轻了体积膨胀和副作用,提高了阳极性能.
这种方法为开发用于下一代电池的高性能基阳极提供了可行的途径.

关键词:

在 SEI 层中,在SiO/C复合体阳极.离子电池是一种离子电池.在化前进行化.卷积扩张卷积扩张

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