Electrochemical and thermal properties of graphite electrodes with imidazolium- and piperidinium-based ionic liquids |
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Authors: | Irina A. Profatilova Nam-Soon Choi Sae Weon Roh Sung Soo Kim |
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Affiliation: | Energy Laboratory, Corporate R&D Center, Samsung SDI Co. Ltd., 575 Shin-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do, 443-731, Republic of Korea |
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Abstract: | The electrochemical and thermal properties of graphite electrodes with electrolytes containing 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMITFSI) and N-methyl,N-propylpiperidinium bis(trifluoromethanesulfonyl)imide (MPPpTFSI) ionic liquids are investigated. The ionic liquids undergo extensive reductive decomposition on a graphite electrode during the first charge. The effect of a fluoroethylene carbonate (FEC) additive on the reductive decomposition of the ionic liquids is examined by electrochemical, scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) analysis. Thermal reactions between a lithiated graphite electrode and an ionic liquid-containing electrolyte are investigated with differential scanning calorimetry (DSC). The introduction of an ionic liquid can effectively reduce the exothermic heat evolution from the thermal reactions between a lithiated graphite electrode and an electrolyte. |
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Keywords: | Graphite electrode Solid electrolyte interphase layer Ionic liquid Differential scanning calorimetry Thermal stability Lithium-ion battery |
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