Comparison of three-dimensional analysis and stereological techniques for quantifying lithium-ion battery electrode microstructures.
Comparison of three-dimensional analysis and stereological techniques for quantifying lithium-ion battery electrode microstructures.
复制标题
DOI：
10.1111/jmi.12389
复制
发表时间：
2016-09
影响因子：
2
通讯作者：
Shearing PR
中科院分区：
文献类型：
--
作者：
Taiwo OO;Finegan DP;Eastwood DS;Fife JL;Brown LD;Darr JA;Lee PD;Brett DJ;Shearing PR
锂离子电池的性能与电极微结构有着内在的联系。锂离子电池电极微结构关键结构参数的定量测量将为电池性能的优化以及系统的数值研究提供动力。随着三维成像技术的快速发展，用体视学方法从二维图像切片中定量评估三维微结构已经过时了；然而，尽管层析成像技术的普及，获取二维(2D)数据集仍然容易得多。在这项研究中，体视学预测和三维(3-D)分析技术用于定量评估表征电池电极微结构的关键几何参数，并进行了比较。锂离子电池电极使用基于同步加速器的X射线断层显微镜进行成像。对于每个被研究的电极样品，体视学分析是对由断层成像产生的重建的二维图像切片进行的，而直接的三维分析是对重建的图像体积进行的。分析表明，使用二维图像部分进行几何参数估计必然与模糊性有关，基于体积的非凸、不规则和相互关联的粒子的三维表征可以用来更准确地量化空间相关参数，如曲折度和孔相连通性。
Lithium‐ion battery performance is intrinsically linked to electrode microstructure. Quantitative measurement of key structural parameters of lithium‐ion battery electrode microstructures will enable optimization as well as motivate systematic numerical studies for the improvement of battery performance. With the rapid development of 3‐D imaging techniques, quantitative assessment of 3‐D microstructures from 2‐D image sections by stereological methods appears outmoded; however, in spite of the proliferation of tomographic imaging techniques, it remains significantly easier to obtain two‐dimensional (2‐D) data sets. In this study, stereological prediction and three‐dimensional (3‐D) analysis techniques for quantitative assessment of key geometric parameters for characterizing battery electrode microstructures are examined and compared. Lithium‐ion battery electrodes were imaged using synchrotron‐based X‐ray tomographic microscopy. For each electrode sample investigated, stereological analysis was performed on reconstructed 2‐D image sections generated from tomographic imaging, whereas direct 3‐D analysis was performed on reconstructed image volumes. The analysis showed that geometric parameter estimation using 2‐D image sections is bound to be associated with ambiguity and that volume‐based 3‐D characterization of nonconvex, irregular and interconnected particles can be used to more accurately quantify spatially‐dependent parameters, such as tortuosity and pore‐phase connectivity.