X-ray Nanocomputed Tomography in Zernike Phase Contrast for Studying 3D Morphology of Li–O2 Battery Electrode,ACS Applied Energy Materials

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X-ray Nanocomputed Tomography in Zernike Phase Contrast for Studying 3D Morphology of Li–O2 Battery Electrode
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-03-24 00:00:00 , DOI: 10.1021/acsaem.9b02236
Zeliang Su _{1,

2} , Vincent De Andrade ₃ , Sorina Cretu _{1,

4} , Yinghui Yin _{1,

2} , Michael J. Wojcik ₃ , Alejandro A. Franco _{1,

2,

5,

6} , Arnaud Demortière _{1,

2,

6}

Affiliation

We investigated the lithium peroxide (Li₂O₂) and pore size distribution in lithium–O₂ battery electrodes at different states of charge using transmission X-ray microscopy coupled with Zernike phase contrast to carry out nanocomputed tomography. We report that such a technique enables us, at the nanoscale, to distinguish light elements such as carbon and Li₂O₂ in Li–O₂ battery cathode electrodes. We verified by wave-propagation simulation that this approach efficiently improves the contrast of images in comparison with pure absorption. The Li₂O₂ distribution and thickness, interphases, and pore network are visualized and quantified, giving a valuable insight into our cathode architecture. From this 3D analysis, we highlight modifications of the air-cathode morphology and the Li₂O₂ spatial organization as well as their potential implication in terms of carbon surface passivation and pore-clogging. After the full recharge process, this technique can also reveal the spatial distribution of the residual Li₂O₂ and other byproducts.

中文翻译：

Zernike相衬X射线纳米计算机断层扫描技术研究Li–O ₂电池电极的3D形态

我们使用透射X射线显微镜和Zernike相衬进行纳米计算机断层扫描，研究了在不同电荷状态下锂-O ₂电池电极中的过氧化锂（Li ₂ O ₂）和孔径分布。我们报告说，这种技术使我们能够在纳米级上区分Li–O ₂电池阴极电极中的轻元素，例如碳和Li ₂ O ₂。我们通过波传播仿真证明，与纯吸收相比，此方法可有效提高图像的对比度。Li ₂ O ₂可视化和量化了分布和厚度，相间和孔网络，从而为我们的阴极结构提供了宝贵的见识。通过此3D分析，我们重点介绍了空气阴极形态和Li ₂ O ₂空间组织的修饰以及它们在碳表面钝化和堵塞孔方面的潜在含义。在完全充电过程之后，该技术还可以揭示残留的Li ₂ O ₂和其他副产物的空间分布。

更新日期：2020-03-24

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