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Finding a Needle in the Haystack: Identification of Functionally Important Minority Phases in an Operating Battery
Nano Letters ( IF 10.8 ) Pub Date : 2017-11-10 00:00:00 , DOI: 10.1021/acs.nanolett.7b03985
Kai Zhang 1, 2 , Fang Ren 2 , Xuelong Wang 3, 4 , Enyuan Hu 3 , Yahong Xu 2 , Xiao-Qing Yang 3 , Hong Li 4 , Liquan Chen 4 , Piero Pianetta 2 , Apurva Mehta 2 , Xiqian Yu 4 , Yijin Liu 2
Affiliation  

The in-depth understanding of the minority phases’ roles in functional materials, e.g., batteries, is critical for optimizing the system performance and the operational efficiency. Although the visualization of battery electrode under operating conditions has been demonstrated, the development of advanced data-mining approaches is still needed in order to identify minority phases and to understand their functionalities. The present study uses nanoscale X-ray spectromicroscopy to study a functional LiCoO2/Li battery pouch cell. The data-mining approaches developed herein were used to search through over 10 million X-ray absorption spectra that cover more than 100 active cathode particles. Two particles with unanticipated chemical fingerprints were identified and further analyzed, providing direct evidence and valuable insight into the undesired side reactions involving the cation dissolution and precipitation as well as the local overlithiation-caused subparticle domain deactivation. The data-mining approach described in this work is widely applicable to many other structurally complex and chemically heterogeneous systems, in which the secondary/minority phases could critically affect the overall performance of the system, well beyond battery research.

中文翻译:

在干草堆中寻找针头:确定工作电池中功能上重要的少数民族阶段

深入了解少数相在功能材料(例如电池)中的作用,对于优化系统性能和运行效率至关重要。尽管已经证明了在工作条件下电池电极的可视化,但仍需要开发先进的数据挖掘方法以识别少数相并了解其功能。本研究使用纳米级X射线光谱显微镜研究功能性LiCoO 2/ Li电池袋电池。本文开发的数据挖掘方法用于搜索超过1000万个覆盖100多个活性阴极粒子的X射线吸收光谱。鉴定并进一步分析了两个具有意外化学指纹的颗粒,为涉及阳离子溶解和沉淀以及局部过锂化引起的亚颗粒域失活的不良副反应提供了直接的证据和有价值的见解。这项工作中描述的数据挖掘方法可广泛应用于许多其他结构复杂和化学异构的系统,其中次要/次要阶段可能会严重影响系统的整体性能,远远超出了电池研究的范围。
更新日期:2017-11-11
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