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在石墨电极合操作显微镜和相场建模中充电和涂层的多尺度动态

Xuekun Lu^1,2,3, Marco Lagnoni⁴, Antonio Bertei⁴

¹Electrochemical Innovation Lab, Department of Chemical Engineering, UCL, London, WC1E 7JE, UK. xuekun.lu@qmul.ac.uk.

Nature communications

|August 24, 2023

概括

石墨阳极中的相分离驱动了涂层,降低了电池的安全性和快速充电. 这项研究揭示了粒子特性和充电率如何影响板,为更好的电池设计提供了洞察力.

科学领域:

电化学电化学电化学
材料科学材料科学材料科学
电池技术电池技术

背景情况:

石墨阳极中的相隔动态对于涂层至关重要.
板是汽车离子电池降解的主要原因,影响安全性和快速充电能力.

研究的目的:

为了研究相位分离和石墨电极中的涂层的取决于速率的空间动态.
提供对多阶段相位分离,化和交换现象的机械学理解.

主要方法:

操作高分辨率光学显微镜.
使用非平衡热力学进行多维相场建模 (1D+1D至3D).
基于图像的3D相场建模.

主要成果:

观察到粒子内部化异质性的强烈依赖于粒子大小,形状,方向,表面状况和C率.
由于化异质性,揭示了涂层的早期发作,通过3D模型空间解析.
在不同充电状态 (SOC) 中突出显著的放松过程,在中间SOC中更快地重新分配.

结论:

开发了对石墨电极相位分离和涂层动态的机械学理解.
证明了粒子水平异质性对金倾向的影响.
为开发先进的快速充电协议以抑制涂层提供了基于物理的关于SOC依赖的放松效率的见解.

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