Lithium Ion Battery Graphite Solid Electrolyte Interphase Revealed by Microscopy and Spectroscopy

详细信息    查看全文

• 作者：Mengyun Nie ; Dinesh Chalasani ; Daniel P. Abraham ; Yanjing Chen ; Arijit Bose ; Brett L. Lucht
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：January 24, 2013
• 年：2013
• 卷：117
• 期：3
• 页码：1257-1267
• 全文大小：708K
• 年卷期：v.117,no.3(January 24, 2013)
• ISSN：1932-7455

文摘

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鈥?0 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.