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首页> 外文期刊>Chemistry: A European journal >A New Method for Quantitative Marking of Deposited Lithium by Chemical Treatment on Graphite Anodes in Lithium-Ion Cells
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A New Method for Quantitative Marking of Deposited Lithium by Chemical Treatment on Graphite Anodes in Lithium-Ion Cells

机译：锂离子电池石墨阳极化学处理沉积锂的定量标记新方法

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摘要

A novel approach for the marking of deposited lithium on graphite anodes from large automotive lithium-ion cells (6Ah) is presented. Graphite anode samples were extracted from two different formats (cylindrical and pouch cells) of pristine and differently aged lithium-ion cells. The samples present a variety of anodes with various states of lithium deposition (also known as plating). A chemical modification was performed to metallic lithium deposited on the anode surface due to previous plating with isopropanol (IPA). After this procedure an oxygenated species was detected by scanning electron microscopy (SEM), which later was confirmed as Li2CO3 by Fourier transform infrared spectroscopy (FTIR) and X-ray powder diffraction (XRPD). A valuation of the covered area by Li2CO3 was carried out with an image analysis using energy-dispersive X-ray spectroscopy (EDX) and quantitative Rietveld refinement.
机译：提出了一种用于标记大型汽车锂离子电池（6Ah）在石墨阳极上沉积的锂的新颖方法。石墨阳极样品是从两种不同形式的原始和不同时效的锂离子电池中提取的。样品呈现出具有各种锂沉积状态（也称为电镀）的各种阳极。由于先前用异丙醇（IPA）进行电镀，对沉积在阳极表面的金属锂进行了化学修饰。在此过程之后，通过扫描电子显微镜（SEM）检测到含氧物质，随后通过傅立叶变换红外光谱（FTIR）和X射线粉末衍射（XRPD）将其确认为Li2CO3。通过使用能量色散X射线光谱（EDX）和定量Rietveld精修的图像分析对Li2CO3覆盖的区域进行评估。

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