Electrochemical behavior of aluminum foil in 1-alkyl-3-methylimidazolium tetrafluoroborate ionic liquids electrolytes  

作　　者：PENG Chengxin YANG Li WANG Baofeng ZHANG Zhengxi LI Nan 

机构地区：[1]School of Chemistry and Chemical Technology, Shanghai Jiaotong University, Shanghai 200240, China

出　　处：《Chinese Science Bulletin》2006年第23期2824-2830,共7页

摘　　要：Aluminum (Al) foil is widely used as a current collector in lithium ion batteries, EDLCs and other electrochemical devices, and its electrochemical behavior in electrolytes has great effect on the cycle performances and safety of the electrochemical devices. In this work, corrosion behavior of Al foil in 1-alkyl-3-methylimidazolium tetrafluoroborate ionic liquids and its electrolytes containing LiTFSI as salt were studied using cyclic voltammogram method. It was found that a passive film was firmly formed on the surface of Al foil after the anodic polarization in BMI-BF_4 compared to those in EMI-BF_4 and PMI-BF_4. In addition, anodic polarization research showed that the passive film on Al surface in BMI-TFSI did not well exist. A good passive film formed on the surface of Al foil in BMI-BF_4 was not broken down until the potential was up to 94.58 V. Moreover, EDX and XPS analysis showed that F and O exist on the Al surface after the anodic polarization in BMI-BF_4, which ind-cated that a passive film like AlF3 and Al2O3 may be formed on its surface.Aluminum （Al） foil is widely used as a current collector in lithium ion batteries, EDLCs and other electrochemical devices, and its electrochemical behavior in electrolytes has great effect on the cycle performances and safety of the electrochemical devices. In this work, corrosion behavior of Al foil in 1-alkyl-3-methylimidazolium tetrafluoroborate ionic liquids and its electrolytes containing LiTFSI as salt were studied using cyclic voltammogram method. It was found that a passive film was firmly formed on the surface of AI foil after the anodic polarization in BMI-BF4 compared to those in EMI-BF4 and PMI-BF4. In addition, anodic polarization research showed that the passive film on AI surface in BMI-TFSI did not well exist. A good passive film formed on the surface of AI foil in BMI-BF4 was not broken down until the potential was up to 94.58 V. Moreover, EDX and XPS analysis showed that F and O exist on the AI surface after the anodic polarization in BMI-BF4, which indicated that a passive film like AIF3 and AI2O3 may be formed on its surface.

关 键 词：锂电池 电容器 电流集电极 离子液体 电解质 

分 类 号：TM91[电气工程—电力电子与电力传动]