Geometric Characteristics of Three Dimensional Reconstructed Anode Electrodes of Lithium Ion Batteries

Energies

Cheolwoong Lim¹  Bo Yan¹  Leilei Yin² 

[1] Department of Mechanical Engineering, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA; E-Mail:;Beckman Institute, University of Illinois, Urbana, IL 61801, USA; E-Mail:

关键词: lithium ion batteries (LIBs);    computed tomography (CT);    geometric characteristics;    representative volume element (RVE);   

DOI  :  10.3390/en7042558

来源: mdpi

【 摘 要 】

The realistic three dimensional (3D) microstructure of lithium ion battery (LIB) electrode plays a key role in studying the effects of inhomogeneous microstructures on the performance of LIBs. However, the complexity of realistic microstructures imposes a significant computational cost on numerical simulation of large size samples. In this work, we used tomographic data obtained for a commercial LIB graphite electrode to evaluate the geometric characteristics of the reconstructed electrode microstructure. Based on the analysis of geometric properties, such as porosity, specific surface area, tortuosity, and pore size distribution, a representative volume element (RVE) that retains the geometric characteristics of the electrode material was obtained for further numerical studies. In this work, X-ray micro-computed tomography (CT) with 0.56 μm resolution was employed to capture the inhomogeneous porous microstructures of LIB anode electrodes. The Sigmoid transform function was employed to convert the initial raw tomographic images to binary images. Moreover, geometric characteristics of an anode electrode after 2400 cycles at the charge/discharge rate of 1 C were compared with those of a new anode electrode to investigate morphological change of the electrode. In general, the cycled electrode shows larger porosity, smaller tortuosity, and similar specific surface area compared to the new electrode.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.