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在现场固体转化为机械适应性LiF丰富的固体电解质介面,通过MgF₂前体在离子电池中的Si表面

Jiayang Sun¹, Linze Lv^1,2, Yuchen Li³

¹College of Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu, 215006, P.R. China.

Angewandte Chemie (International ed. in English)

|May 23, 2025

概括

这项研究为离子电池中的阳极引入了一种新的MgF2涂层,大大提高了它们的稳定性和性能. 这项创新解决了开发下一代高能量密度电池的关键挑战.

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
纳米技术纳米技术

背景情况:

阳极为离子电池 (LIB) 提供高容量,但受到体积膨胀和不稳定的固体电解质介相 (SEI) 的影响.
传统的SEI层在机械上很弱,离子导电性很差,限制了电池的寿命.
开发稳定的阳极对于推进高能量密度LIBs至关重要.

研究的目的:

使用现场转换的MgF2层为阳极设计一个稳定的接口.
为了增强SEI层的离子导电性,电子绝缘性和机械性能.
提高基于的LIB的整体性能和耐用性.

主要方法:

用化 (MgF2) 层装饰纳米粒子.
在化过程中研究MgF2在现场转化为富含LiF的SEI.
半细胞和全细胞配置的Si@MgF2-1阳极的电化学测试.

主要成果:

MgF2层在现场转化,形成一个强大的SEI,涂层完整度为94.2%.
Si@MgF2-1阳极表现出高的初始库伦比效率 (91.7%) 和出色的速率能力 (2000 mAh g-1在10°C).
实现了显著的循环稳定性,在500个循环后保留了1794.9 mAh g-1.

结论:

MgF2转换策略有效地创建了一个机械适应性的,富含LiF的SEI层.
这种方法显著提高了LIBs的阳极的稳定性和性能.
这些发现为耐用和高性能基电池铺平了道路.

关键词:

离子电池是一种离子电池.MgF2MgF2MgF2MgF2MgF2MgF2MgF2MgF2MgF2MgF2MgF2 阳极是一种阳极.固体电解质相间阶段

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