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

作　　者：LI JunTao SU Hang HUANG Ling SUN ShiGang 

机构地区：[1]School of Energy Research, Xiamen University [2]State Key Laboratory of Physical Chemistry of Solid Surfaces [3]Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University

出　　处：《Science China Chemistry》2013年第7期992-996,共5页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China (21003102, 21021002);the Fundamental Research Funds for the Central Universities (2012121035);the National Basic Research Program of China (2009CB220102)

摘　　要：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.Graphite thin film anodes with a high IR reflectivity have been prepared by a spin coating method. Both ex situ and in situ microscope FTIR spectroscopy (MFTIRS) 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 mol L -1 LiPF6 /ethylene carbonate + dimethyl carbonate (1:1) are alkyl lithium carbonates (ROCO2 Li). The desolvation process on graphite anodes during the initial intercalation of lithium ion with graphite was also observed and analyzed by in situ MFTIRS.

关 键 词：graphite anode interfaciai process FTIR spectroscopy lithium-ion battery 

分 类 号：TM912[电气工程—电力电子与电力传动]