Detection of local chemical states of lithium and their spatial mapping by scanning transmission electron microscopy, electron energy-loss spectroscopy and hyperspectral image analysis.
Detection of local chemical states of lithium and their spatial mapping by scanning transmission electron microscopy, electron energy-loss spectroscopy and hyperspectral image analysis.
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通过扫描透射电子显微镜、电子能量损失光谱和高光谱图像分析检测锂的局部化学状态及其空间映射。
DOI：
10.1093/jmicro/dfw043
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发表时间：
2017
期刊：
影响因子：
1.8
通讯作者：
K. Tatsumi
中科院分区：
文献类型：
--
作者：
S. Muto;K. Tatsumi
具有不可燃固体电解质的全固态锂离子电池是有前途的能量存储装置，因为它们在安全性、寿命和能量密度方面具有显著优势。电化学反应，即Li离子插入/提取反应，通常发生在电极和固体电解质之间的纳米级界面周围。因此，透射电子显微镜（TEM）是直接观察这些反应的合适技术，为理解基本的固态电化学和改善电池性能提供了重要信息。在这篇综述中，我们介绍了两种类型的TEM技术用于电池反应的operandobservations，空间分辨电子能量损失谱在TEM模式的直接检测的锂浓度分布和电子全息观察由于锂离子插入/提取反应的电势变化。我们直观地显示了锂离子插入/拔出如何影响晶体结构，电子结构和局部电位在这些电池的充放电过程中。
All-solid-state Li-ion batteries having incombustible solid electrolytes are promising energy storage devices because they have significant advantages in terms of safety, lifetime and energy density. Electrochemical reactions, namely, Li-ion insertion/extraction reactions, commonly occur around the nanometer-scale interfaces between the electrodes and solid electrolytes. Thus, transmission electron microscopy (TEM) is an appropriate technique to directly observe such reactions, providing important information for understanding the fundamental solid-state electrochemistry and improving battery performance. In this review, we introduce two types of TEM techniques foroperandoobservations of battery reactions, spatially resolved electron energy-loss spectroscopy in a TEM mode for direct detection of the Li concentration profiles and electron holography for observing the electric potential changes due to Li-ion insertion/extraction reactions. We visually show how Li-ion insertion/extractions affect the crystal structures, electronic structures, and local electric potential during the charge–discharge processes in these batteries.