同步辐射多模态成像技术在储能电池领域的研究进展

doi:10.19799/j.cnki.2095-4239.2022.0012

摘要/Abstract

摘要：

锂离子电池因具有较高的能量密度已广泛应用于便携式电子产品中。然而，它们在电动汽车和电网储能方面的潜在应用需要更高的能量密度。开发下一代电化学能源存储器件仍然存在巨大的挑战。同步加速X射线成像技术由于具有无损性、元素敏感性和高穿透性等天然优势，正受到越来越多地关注。本文重点介绍了同步辐射的X射线成像技术及其相关应用，以了解能量材料的物理/化学性质和反应机理。讨论了几种主要的X射线成像技术，包括X射线投影成像、透射X射线显微镜(TXM)、扫描透射X射线显微镜(STXM)、X射线荧光显微镜(XFM)和相干衍射成像(CDI)。希望这篇综述能够拓宽读者对X射线成像技术的认识，并为能源材料的研究提供新思路和可能性。

关键词: 同步辐射, X射线, 锂离子电池, 先进表征技术

Abstract:

Lithium-ion batteries have been widely applied in portable electronics due to their high energy densities. However, their potential applications in electric vehicles and grid energy storage call for higher energy density. It is a critical challenge to develop the next-generation electrochemical energy storage devices. Synchrotron X-ray imaging techniques are currently catching increasing attention due to their intrinsic advantages, including non-destructiveness, chemically responsiveness, elementally sensitivity, and high penetrability to enable operando investigation of a real battery. Based on the derived nano-tomography techniques, it can provide 3D morphological information including thousands of slice morphologies from the bulk to the surface. Combined with X-ray absorption spectroscopy, X-ray imaging can even present chemical and phase mapping information, including the oxidation state, local environment, etc., with sub-30 nm spatial resolution, which addresses the issues that we only obtain as averaged information in traditional X-ray absorption spectroscopy. Through an operando charging/discharging setup, X-ray imaging enables the study of the correlation between the morphology change and the chemical evolution (mapping) under different states of charge and cycling. In addition, X-ray imaging breaks up the size limit of nanoscale samples for the in-situ transmission electron microscope imaging, which enables a large, thick sample with a broad field of view, truly uncovering the behavior inside a real battery system. We will discuss a few major X-ray imaging technologies, including X-ray projection imaging, transmission X-ray microscopy, scanning transmission X-ray microscopy, tender and soft X-ray imaging, and coherent diffraction imaging. Researchers can choose from various X-ray imaging techniques with different working principles based on research goals and sample specifications. With the X-ray imaging techniques, we can obtain the morphology, phase, lattice and strain information of energy materials in both 2D and 3D in an intuitive way. In addition, with the high-penetration X-rays and the high-brilliance synchrotron sources, operando/in-situ experiments can be designed to track the qualitative and quantitative changes of the samples during operation. We expect this review can broaden readers' view on X-ray imaging techniques and inspire new ideas and possibilities in energy materials research.

Key words: synchrotron radiation, X-ray, lithium-ion battery, the state of art characterization technology

中图分类号:

O 646

安汉文, 莫生凯, 李梦璐, 王家钧. 同步辐射多模态成像技术在储能电池领域的研究进展[J]. 储能科学与技术, 2022, 11(3): 834-851.

Hanwen AN, Shengkai MO, Menglu LI, Jiajun WANG. Research progress of synchrotron radiation multimodal imaging technology in field of energy storage batteries[J]. Energy Storage Science and Technology, 2022, 11(3): 834-851.

图/表 4

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