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涂有LiF的NMC811电极的高压循环稳定性

Princess Stephanie Llanos¹, Zahra Ahaliabadeh¹, Ville Miikkulainen¹

¹Department of Chemistry and Materials Science, School of Chemical Engineering, Aalto University, 02150 Espoo, Finland.

ACS applied materials & interfaces

|January 3, 2024

概括

纳米级的化 (LiF) 涂层增强了电动汽车高能,,,氧化 (NMC811) 阴极的循环稳定性. 这种涂层有效地抑制了电极-电解质接口上的有害反应,提高了电池的性能.

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:

使用LiNi0.8Mn0.1Co0.1O2 (NMC811) 阴极的高能量密度离子电池 (LIB) 对电动汽车至关重要.
由于寄生式电极-电解质反应,商业化受到高电压下循环稳定性差的限制.
在NMC811中的容量衰减与接口生长,相变,过渡金属溶解和粒子裂变有关.

研究的目的:

为了提高高切断电压下NMC811阴极的循环稳定性.
为了减轻电极-电解质接口上寄生性副作用引起的容量衰减.
研究纳米尺度化 (LiF) 涂层对稳定NMC811.11的有效性.

主要方法:

原子层沉积 (ALD) 用于在NMC811电极上涂上纳米级LiF涂层.
电化学性能使用半细胞 (3.0-4.6V与Li/Li+) 和全细胞 (2.8-4.5V与石墨) 配置进行评估.
进行循环后的结构,形态和化学分析,以了解降解机制.

主要成果:

与未涂层的NMC811相比,涂层NMC811 (LiF-NMC811) 在高切断电压下表现出优越的循环稳定性.
LiF涂层通过减少NMC811与电解质之间的直接接触,有效地抑制了寄生虫反应.
即使在高放电率下,速度性能也保持不变,这表明涂层不会阻碍离子传输.

结论:

纳米级LiF涂层是一种有效的策略,可以提高NMC811阴极的高压循环稳定性.
稳定电极-电解质接口对于释放高容量NMC811材料的全部潜力至关重要.
这些发现支持使用LiF涂层用于要求提高耐用性和能量密度的先进LIB应用.

关键词:

生命的生命生命的生命在NMC81111中,它是NMC811的.原子层沉积的原子层沉积.阴极电解质接口接口的介面电极涂层是一种电极涂层.高压循环循环的高压循环.

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