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超高阴极与B/Al编梯度接口,用于高能全固态电池

Xiangqun Xu^1,2, Sheng Xu^1,2, Shuqi Kang^1,2

¹College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, National Laboratory of Solid-State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.

Journal of the American Chemical Society

|March 11, 2026

概括

超高阴极上的工程表面层提高了全固态电池的性能. 这一新的战略提高了下一代电池的稳定性和循环寿命.

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:

超高层氧化物阴极 (NCM,Ni≥0.9) 对于全固态电池 (ASSB) 的高能量密度至关重要.
接口不稳定性,包括电解质分解和结构退化,阻碍了这些先进的阴极的性能.

研究的目的:

为单晶LiNi0.92Co0.06Mn0.02O2 (SNCM) 阴极制定一个表面工程战略.
为了减轻ASSB的界面副作用和结构退化.

主要方法:

与 (B) 和 (Al) 进行协同协同,在SNCM上创建一个梯度离子失序层.
描述保护层对界面化学和结构稳定性的影响.

主要成果:

B诱导的无序层抑制了阴极和固态电解质 (SSE) 之间的副作用反应.
胺剂增强了Li+动力学和稳定了网状氧气,进一步防止了降解.
经过修改的SNCM阴极表现出高的初始放电容量 (236.0 mAh/g) 和优秀的容量保留 (86%在60°C的200个循环后;在5C/RT的500个循环后94%).

结论:

一种新型的渐变离子失序层有效地保护超高阴极.
这种表面工程方法显著提高了用于实际ASSB的阴极的稳定性和周期寿命.

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