Investigation of interfacial processes in graphite thin film anodes of lithium-ion batteries by both in situ and ex situ infrared spectroscopy

• Published in: Science China. Chemistry Vol. 56; no. 7; pp. 992 - 996
• Main Authors: Li, JunTao, Su, Hang, Huang, Ling, Sun, ShiGang
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.07.2013; Springer Nature B.V
• Subjects: Anodes; Carbonates; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Graphite; Infrared spectroscopy; Lithium carbonate; Lithium-ion batteries; Rechargeable batteries; Solid electrolytes; Spin coating; Thin films; 固体电解质; 界面过程; 石墨阳极; 碳酸二甲酯; 红外光谱; 红外反射率; 薄膜; 锂离子电池; graphite anode; interfacial process; lithium-ion battery; FTIR spectroscopy
• ISSN: 1674-7291; 1869-1870
• DOI: 10.1007/s11426-013-4844-6

Graphite thin film anodes with a high IR reflectivity have been prepared by a spin coating method. Both ex situ and in situ mi- croscope FTIR spectroscopy （MFFIRS） in a reflection configuration were employed to investigate interfacial processes of the graphite thin film anodes in lithium-ion batteries. A solid electrolyte interphase layer （SEI layer） was formed on the cycled graphite thin film anode. Ex situ MFTIRS revealed that the main components of the SEI layer on cycled graphite film anodes in 1 tool L 1 LiPF6/ethylene carbonate ＋ dimethyl carbonate （1：1） are alkyl lithium carbonates （ROCOzLi）. The desolvation process on graphite anodes during the initial intercalation of lithium ion with graphite was also observed and analyzed by in situ MFTIRS.