| Related citation: | CUI Wen-yu,AN Mao-zhong,YANG Pei-xia,ZHANG Jin-qiu,SUN Xing-bin.Vinylene carbonate additive for EMITFSI-based electrolyte for Li/LiFePO4 batteries[J].Journal of Harbin Institute Of Technology(New Series),2011,18(5):44-48.DOI:10.11916/j.issn.1005-9113.2011.05.008. |
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| Author Name | Affiliation | | CUI Wen-yu | School of Chemical Engineering and Technology,Harbin Institute of Technology,Harbin 150001,China | | AN Mao-zhong | School of Chemical Engineering and Technology,Harbin Institute of Technology,Harbin 150001,China | | YANG Pei-xia | School of Chemical Engineering and Technology,Harbin Institute of Technology,Harbin 150001,China | | ZHANG Jin-qiu | School of Chemical Engineering and Technology,Harbin Institute of Technology,Harbin 150001,China | | SUN Xing-bin | Dept.of Environmental Science,Northeast Forestry University,Harbin 150040,China |
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| Abstract: |
| Ionic liquids have been paid much attention and are considered to replace the conventional organic electrolyte and solve the safety issues by virtue of nonvolatility,non-flammability,high ionic conductivity and extended electrochemical steady window.The paper introduces ionic liquids electrolyte on basis of 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (EMITFSI),which shows a wide electrochemical window (0.5-4.5 V vs.Li+/Li),and is theoretically feasible as an electrolyte for Li/LiFePO4batteries to improve the safety.Linear sweep voltammetry (LSV) was performed to investigate the electrochemical stability window of the polymer electrolyte.Interfacial resistance for Li/electrolyte/Li symmetric cells and Li/electrolyte/LiFePO4 cells were studied by electrochemical impedance spectroscopy (EIS).The results showed that additive vinylene carbonate (VC) enhances the formation of solid electrolyte interphase film to protect lithium anodes from corrosion and improves the compatibility of ionic liquid electrolyte towards lithium anodes.Accordingly,Li/LiFePO4cells delivers the initial discharge capacity of 124 mAh g-1 at a current rate of 0.1C in the ionic liquid electrolyte (EMITFSI+0.8 mol L-1LiTFSI+5 wt%VC),and shows better cyclability than in the ionic liquid electrolyte without VC. |
| Key words: room temperature ionic liquid lithium batteries vinylene carbonate solid electrolyte interphase film |
| DOI：10.11916/j.issn.1005-9113.2011.05.008 |
| Clc Number:TM912 |
| Fund: |
