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Updated: Jun 23, 2025

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表面和粒度边界涂层用于稳定LiNi_0.8Mn_0.1Co_0.1O₂基电极

Zahra Ahaliabadeh¹, Ville Miikkulainen¹, Miia Mäntymäki²

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

|June 19, 2024

概括

无形酸涂层增强了离子电池中高容量的富层氧化物 (NMC811) 阴极的稳定性. 这种表面修改改善了结构完整性,并提高了容量保留,延长了电池的寿命.

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
电池技术电池技术

背景情况:

高容量的富层氧化物,如LiNi_0.8Mn_0.1Co_0.1O₂ (NMC811),对于先进的离子电池至关重要.
实际容量损失和在运行过程中工作电压降低阻碍了NMC811.1的广泛采用.
在循环过程中,粒子降解和结构不稳定导致性能下降.

研究的目的:

改进NMC811电极的循环寿命和电化学性能.
通过原子层沉积 (ALD) 应用无形酸 (LTO) 涂层的保护作用.
通过结构分析了解电池衰老中的化学和机械因素之间的相互作用.

主要方法:

无形LTO涂层的原子层沉积 (ALD).
电化学测试用于评估循环寿命和容量保持.
操作X射线衍射 (XRD) 和扩展计,以监测循环过程中的结构变化.

主要成果:

该LTO涂层有效地覆盖NMC811表面,包括空洞和粒度边界.
操作XRD显示在脱过程中未涂层NMC811的显著结构演变,LTO涂层减轻了这种变化.
涂层NMC811表现出高度可逆的相位变化,表明增强的散装结构稳定性.
在140个循环后,涂层NMC811的容量保留率从86%提高到93%,与未涂层NMC811相比.

结论:

通过ALD进行无形LTO涂层是一种可行的策略,可以增强富含Ni的多层氧化物阴极的结构稳定性和电化学性能.
颗粒边界工程对于改善高容量阴极材料的循环寿命至关重要.
该研究强调了解决离子电池衰老中的化学和机械降解途径的重要性.

关键词:

原子层沉积的原子层沉积.破裂,裂,裂,裂,裂,裂,裂,裂,裂,裂,裂,裂,裂,裂,裂,裂.谷物边界的谷物边界是什么泰坦酸涂层的使用方法富含的正极电极是富含的正极电极.阶段过渡阶段过渡阶段过渡

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