Enhanced Imaging of Lithium Ion Battery Electrode Materials
Enhanced Imaging of Lithium Ion Battery Electrode Materials
复制标题
DOI：
10.1149/2.0061701jes
复制
发表时间：
2017-01-01
影响因子：
3.9
通讯作者：
Brandon, Nigel
中科院分区：
文献类型：
--
作者：
Biton, Moshiel;Yufit, Vladimir;Brandon, Nigel
在这项研究中，我们提出了一种新的方法，锂离子电池电极样品的制备与一种新型的环氧树脂浸渍，溴化（Br）环氧树脂，这是首次在这里介绍了这一目的，并发现适合于聚焦离子束扫描电子显微镜（FIB-SEM）断层扫描。Br环氧树脂改善了图像对比度，这使得能够实现更高的FIB-SEM分辨率（3D成像），这是使用FIB-SEM的复合LFP阴极有史以来报道的最高分辨率之一。反过来，这意味着颗粒被很好地定义，每个相的尺寸分布可以使用先进的量化算法从复杂的3D电极微观结构中准确分析。作者首次提出了一种新的3D成像对比度增强方法，包括新的先进量化，在商业磷酸铁锂（LFP）LiFePO 4阴极上。这项工作的目的是通过开发方法来提高具有挑战性的电池材料的3D成像质量，以增加以前差异很小的相之间的对比度。这对于捕获电极微结构的真实的几何形状是必要的，从而可以测量广泛的微结构特性，例如孔隙/粒度分布、表面积、曲折度和孔隙率。这些性质在决定电池电极的性能方面起着至关重要的作用。(C)作者（S）2016由ECS发布。这是一篇开放获取的文章，根据知识共享署名4.0许可证（CC BY，http：//creativecommons.org/licenses/by/4.0/）的条款分发，该许可证允许在任何媒体上不受限制地重复使用作品，前提是正确引用原始作品。All rights reserved.
In this study we present a novel method of lithium ion battery electrode sample preparation with a new type of epoxy impregnation, brominated (Br) epoxy, which is introduced here for the first time for this purpose and found suitable for focused ion beam scanning electron microscope (FIB-SEM) tomography. The Br epoxy improves image contrast, which enables higher FIB-SEM resolution (3D imaging), which is amongst the highest ever reported for composite LFP cathodes using FIB-SEM. In turn it means that the particles are well defined and the size distribution of each phase can be analyzed accurately from the complex 3D electrode microstructure using advanced quantification algorithms.The authors present for the first time a new methodology of contrast enhancement for 3D imaging, including novel advanced quantification, on a commercial Lithium Iron Phosphate (LFP) LiFePO4 cathode. The aim of this work is to improve the quality of the 3D imaging of challenging battery materials by developing methods to increase contrast between otherwise previously poorly differentiated phases. This is necessary to enable capture of the real geometry of electrode microstructures, which allows measurement of a wide range of microstructural properties such as pore/particle size distributions, surface area, tortuosity and porosity. These properties play vital roles in determining the performance of battery electrodes. (C) The Author(s) 2016. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. All rights reserved.