Compatibility of quaternary ammonium-based ionic liquid electrolytes with electrodes in lithium ion batteries |
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Authors: | Honghe Zheng Bao Li Takeshi Abe |
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Affiliation: | a Department of Chemistry, Henan Normal University, Xinxiang 453007, PR China b Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan |
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Abstract: | Electrochemical intercalation/deintercalation behavior of lithium into/from electrodes of lithium ion batteries was comparatively investigated in 1 mol/L LiClO4 ethylene carbonate-diethyl carbonate (EC-DEC) electrolyte and a quaternary ammonium-based ionic liquid electrolyte. The natural graphite anode exhibited satisfactory electrochemical performance in the ionic liquid electrolyte containing 20 vol.% chloroethylenene carbonate (Cl-EC). This is attributed to the mild reduction of solvated Cl-EC molecules at the graphite/ionic electrolyte interface resulting in the formation of a thin and homogenous SEI on the graphite surface. However, rate capability of the graphite anode is poor due to the higher interfacial resistance than that obtained in 1 mol/L LiClO4/EC-DEC organic electrolyte. Spinel LiMn2O4 cathode was also electrochemically cycled in the ionic electrolyte showing satisfactory capacity and reversibility. The ionic electrolyte system is thus promising for 4 V lithium ion batteries based on the concept of “greenness and safety”. |
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Keywords: | Lithium ion batteries Natural graphite anodes Room temperature ionic liquids Electrolyte Compatibility |
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