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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Lithium Ion Battery Graphite Solid Electrolyte Interphase Revealed by Microscopy and Spectroscopy
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Lithium Ion Battery Graphite Solid Electrolyte Interphase Revealed by Microscopy and Spectroscopy

机译：显微镜和光谱显示锂离子电池石墨固体电解质相间

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The surface reactions of electrolytes with the graphitic anode of lithium ion batteries have been investigated. The investigation utilizes two novel techniques, which are enabled by the use of binder-free graphite anodes. The first method, transmission electron microscopy (TEM) with energy dispersive X-ray spectroscopy, allows straightforward analysis of the graphite solid electrolyte interphase (SEI). The second method utilizes multi-nuclear magnetic resonance (NMR) spectroscopy of D2O extracts from the cycled anodes. The TEM and NMR data are complemented by XPS and FTIR data, which are routinely used for SEI studies. Cells were cycled with LiPF6 and ethylene carbonate (EC), ethyl methyl carbonate (EMC), and EC/EMC blends. This unique combination of techniques establishes that for EC/LiPF6 electrolytes, the graphite SEI is ～50 nm thick after the first full lithiation cycle, and predominantly contains lithium ethylene dicarbonate (LEDC) and LiF. In cells containing EMC/LiPF6 electrolytes, the graphite SEI is nonuniform, ～10—20 nm thick, and contains lithium ethyl carbonate (LEC), lithium methyl carbonate (LMC), and LiF. In cells containing EC/EMC/LiPF6 electrolytes, the graphite SEI is ～50 nm thick, and predominantly contains LEDC, LMC, and LiF.
机译：已经研究了电解质与锂离子电池的石墨阳极的表面反应。该研究利用了两种新颖的技术，这些技术可以通过使用无粘合剂的石墨阳极来实现。第一种方法是带有能量色散X射线光谱的透射电子显微镜（TEM），可以直接分析石墨固体电解质的中间相（SEI）。第二种方法是利用多核磁共振（NMR）光谱分析循环阳极中的D2O提取物。 TEM和NMR数据得到XPS和FTIR数据的补充，而XPS和FTIR数据通常用于SEI研究。用LiPF6和碳酸亚乙酯（EC），碳酸乙基甲基酯（EMC）和EC / EMC共混物循环电池。这种独特的技术组合确定了对于EC / LiPF6电解质，在第一个完整的锂化周期后，石墨SEI的厚度约为50 nm，并且主要包含碳酸二乙酯锂（Lied Diethyl Carbonate，COC）和LiF。在含有EMC / LiPF6电解质的电池中，石墨SEI不均匀，约10至20 nm厚，并且包含碳酸锂锂（LEC），碳酸甲基锂（LMC）和LiF。在包含EC / EMC / LiPF6电解质的电池中，石墨SEI的厚度约为50 nm，主要包含LEDC，LMC和LiF。

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