A tetraethylene glycol dimethylether-lithium bis(oxalate)borate (TEGDME-LiBOB) electrolyte for advanced lithium ion batteries |
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Authors: | Dong-Ju LeeJusef Hassoun Stefania PaneroYang-Kook Sun Bruno Scrosati |
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Affiliation: | a Department of WCU Energy Engineering, Hanyang University, Seoul 133-791, Republic of Koreab Department of Chemistry, University of Rome Sapienza, 00185, Rome, Italyc Department of Chemical Engineering, Hanyang University, Seoul 133-791, Republic of Korea |
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Abstract: | Tetraethylene glycol dimethylether-lithium bis(oxalate)borate (TEGDME-LiBOB) electrolyte is here studied. Electrochemical impedance spectroscopy (EIS) measurements demonstrate that the electrolyte has conductivity higher than 10− 3 S cm− 1 at room temperature and about 10− 2 S cm− 1 at 60 °C, while thermogravimetry indicates a stability extending up to 180 °C. Sweep voltammetry of the electrolyte shows anodic stability extending over 4.6 V vs. Li and cathodic peak at about 1.5 V vs. Li/Li+, caused by a decomposition of LiBOB salt, and following prevented by using a pre-treated Sn-C anode. Furthermore, LiFePO4 electrode is successfully used as cathode in a lithium cell using the TEGDME-LiBOB electrolyte. The promising electrochemical results, the low cost and the very high safety level candidate the electrolyte here reported as a valid alternative to the conventional electrolyte based on fluorinated salts presently used in the lithium ion battery field. |
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Keywords: | Tetraethylene glycol dimethylether TEGDME Lithium bis(oxalate)borate LiBOB Electrolyte Lithium ion battery |
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