为提高高NiNCM阴极的稳定性,在表面和颗粒间接口同时形成LiF的开创性灭策略
Sung Joon Park1, Hami Lee1, Hee-Beom Lee1,2
1Department of Energy Science, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Republic of Korea.
Small (Weinheim an der Bergstrasse, Germany)
|September 4, 2025
概括
这项研究引入了一种新方法,通过在烧结过程中灭高NCM阴极以制造保护性化物 (LiF) 涂层. 这一过程提高了阴极稳定性和电化学性能,没有额外的步骤.
科学领域:
- 材料科学
- 电化学
- 化学工程
背景情况:
- 高LiNi0.8Co0.1Mn0.1O2 (NCM) 阴极对于高能量密度电池至关重要.
- 在NCM阴极上的表面残留降低了性能,需要去除.
- 现有的去除残留或形成保护层的方法通常涉及额外的加工步骤,限制了工业的可扩展性.
研究的目的:
- 为提高高NCM阴极的稳定性制定一个可行的工业战略.
- 直接将表面残留转化为保护性化 (LiF) 层.
- 阐明表面和界面LiF在改善结构和电化学性能方面的不同作用.
主要方法:
- 对NCM阴极的传统烧结过程的修改.
- 用化基介质火代替最后一个空气冷却步骤.
- 在各种火温度下进行受控实验,以分析LiF层的形成和影响.
主要成果:
- 在二次粒子表面和初级粒子界面上同时形成LiF层.
- 证明表面LiF减轻了电解质的副作用,而界面LiF则抑制了微裂纹的形成.
- 当与石墨阳极配对时,具有双LiF层的高NCM阴极在300个循环中表现出稳定的循环性能.
结论:
- 拟议的灭策略提供了一种直接的,单步方法,用于在高NCM阴极上制造有益的LiF涂层.
- 双层LiF显著提高了结构完整性和电化学稳定性.
- 这种方法对离子电池的先进阴极材料的工业生产具有实际潜力.
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