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通过Li₂CeO₃的缺陷工程:高阴极中的结构完整性和晶格氧气稳定性的双优化

Pan Yang¹, Zhiwei Yang¹, Yun Deng^1,2

¹Key Laboratory of Power Battery and Materials, School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China.

ACS applied materials & interfaces

|September 5, 2025

概括

这项研究提高了使用Li2CeO3 (LCO) 涂层的离子电池的高NCM阴极稳定性. 这种LCO涂层提高了结构完整性和电化学性能,提高了循环寿命和能量密度.

科学领域:

材料科学
电化学
能量储存

背景情况:

高层氧化物 (NCM) 阴极对于高能量密度的离子电池至关重要.
在循环过程中,NCM阴极的结构不稳定和接口退化,限制了商业用途.
开发稳定的阴极材料对于先进的电池技术至关重要.

研究的目的:

提高高NCM阴极的结构稳定性和循环性能.
为了减轻NCM阴极中的接口降解和电解质副作用.
研究Li2CeO3 (LCO) 涂层对NCM阴极性能的影响.

主要方法:

用Li2CeO3 (LCO) 涂覆高NCM材料.
描述原始和LCO涂层NCM的结构和电化学特性.
评估循环稳定性,速度性能和界面行为.

主要成果:

LCO涂层显著改善了循环稳定性,在200个循环 (1.0°C) 后,1.0%的LCO@NCM保持了83.52%的容量,而原始NCM则保持了65.29%.
修改后的阴极表现出增强的速率性能,更高的初始放电容量 (202.5 mAh g-1),以及改善的第一周期库伦比效率 (95.4%).
LCO涂层降低了界面阻抗和改善了Li+扩散动力学,优化了结构完整性和氧氧还原活性.

结论:

Li2CeO3涂层是提高高NCM阴极稳定性和性能的一种有效策略.
通过LCO对结构完整性和氧氧还原活性进行双重优化,有助于改善循环寿命.
这种方法对开发下一代高能量密度的离子电池具有前景.

关键词:

覆盖方式双优化高阴极离子电池消极化层

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