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无孔单晶颗粒,用于耐用的离子电池阴极

Seohee Jeong¹, Hyokyeong Kang¹, Seongje Ryu¹

¹Department of Energy Engineering, Hanyang University, Seoul 04763, Republic of Korea.

ACS applied materials & interfaces

|August 20, 2024

概括

单晶阴极通过提高结构稳定性来提高离子电池的性能. 这种新材料为实际应用提供了具有成本效益的合成途径.

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:

由于其高能量密度,O3型层氧化物是离子电池 (SIB) 的有希望的阴极材料.
多晶Na[Ni0.6Co0.2Mn0.2]O2 (PC-NCM) 阴极存在结构和界面的不稳定性,这限制了它们在SIB中的实际应用.
开发稳定和高性能阴极材料对于推进SIB技术至关重要.

研究的目的:

设计和合成一个单晶O3型Na[Ni0.6Co0.2Mn0.2]O2 (SC-NCM) 阴极.
研究SC-NCM用于SIBs的结构和电化学特性.
为了解决在多晶对应物中观察到的降解途径.

主要方法:

通过盐方法合成单晶O3型Na[Ni0.6Co0.2Mn0.2]O2 (SC-NCM).
电化学表征包括循环性能和稳定性测试.
结构分析以了解SC-NCM的增强稳定性.

主要成果:

机械上坚固的SC-NCM由于没有孔隙,对粒子裂的耐受性提高.
SC-NCM表现出稳定的循环性能,在350个循环中保持73%的容量.
采用了一种简单,经济高效的盐合成途径,避免了复杂的火过程.

结论:

单晶SC-NCM有效地减轻降解通路,从而提高SIB的循环稳定性.
盐合成为生产先进的阴极材料提供了一种实用且可扩展的方法.
这项研究为开发用于实用的离子电池的高性能阴极材料提供了新的方向.

关键词:

在 NaNCM 阴极.微裂纹 (microcracking) 是一种微裂纹技术.聚晶颗粒是一种多晶颗粒.单晶颗粒是一种单晶颗粒.离子电池离子电池

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