Impedance Studies of Spinel LiMn_2O_4 Electrode/electrolyte Interfaces  

作　　者：ZHUANG Quan-chao FAN Xiao-yong XU Jin-mei WEI Guo-zhen DONG Quan-feng SUN Shi-gang 

机构地区：[1]School of Materials Science and Engineering, China University of Mining ＆ Technology, Xuzhou 221116, P. R. China [2]State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, Xiamen University, Xiamen 361005, P. R. China

出　　处：《Chemical Research in Chinese Universities》2008年第4期511-515,共5页高等学校化学研究（英文版）

基　　金：the National Key Basic Research Program of China(No.2002BC211804)

摘　　要：The formation process of solid electrolyte interphase（SEI） film on spinel LiMn2O4 electrode surface was studied by electrochemical impedance spectroscopy（EIS） during the initial storage in 1 mol/L LiPF6-EC：DMC：DEC electrolyte and in the subsequent first charge-discharge cycle. It has been demonstrated that the SEI film thickness increased with the increase of storage time and spontaneous reactions occurring between spinel LiMn2O4 electrode and electrolyte can be prevented by the SEI film. In the first charge-discharge cycle succeeding the storage, the electrolyte oxidation coupled with Li-ion insertion is evidenced as the main origin to increase the resistance of SEI film. The results also confirm that the variations of the charge transfer resistance（Rot） with the electrode potential（E） can be well described using a classical equation.The formation process of solid electrolyte interphase（SEI） film on spinel LiMn2O4 electrode surface was studied by electrochemical impedance spectroscopy（EIS） during the initial storage in 1 mol/L LiPF6-EC：DMC：DEC electrolyte and in the subsequent first charge-discharge cycle. It has been demonstrated that the SEI film thickness increased with the increase of storage time and spontaneous reactions occurring between spinel LiMn2O4 electrode and electrolyte can be prevented by the SEI film. In the first charge-discharge cycle succeeding the storage, the electrolyte oxidation coupled with Li-ion insertion is evidenced as the main origin to increase the resistance of SEI film. The results also confirm that the variations of the charge transfer resistance（Rot） with the electrode potential（E） can be well described using a classical equation.

关 键 词：Li-ion batteries SEI film Electrochemical impedance spectroscopy Spinel LiMn2O4 

分 类 号：TM912.2[电气工程—电力电子与电力传动]