Anion receptor for enhanced thermal stability of the graphite anode interface in a Li-ion battery |
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| Institution: | 1. School of Materials Science and Engineering, University of Science and Technology Beijing, No. 30 Xue Yuan Road, Beijing 100083, China;2. Military Power Sources Research and Development Center, Research Institute of Chemical Defense, Beijing 100191, China;1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan, Hubei 430070, China;2. Nanostructure Research Centre (NRC), Wuhan University of Technology, 122 Luoshi Road, Wuhan, Hubei 430070, China;3. Laboratory of Inorganic Materials Chemistry (CMI), University of Namur, 61 Rue de Bruxelles, Namur B-5000, Belgium;1. Center for Energy Convergence Research, Korea Institute of Science and Technology, 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea;2. Department of Chemical and Biological Engineering, Korea University, 145, Anam-ro, Sungbuk-gu, Seoul 02841, Republic of Korea;3. Division of Energy & Environment Technology, KIST School, Korea University of Science and Technology, Seoul 02792, Republic of Korea;4. Department of Energy and Chemical Engineering, Incheon National University, 119, Academy-ro, Yeonsu-gu, Incheon 22012, Republic of Korea;5. Department of Advanced Materials Engineering for Information and Electronics, Kyung Hee University, Deokyoung-daero 1732, Yongin, Gyeonggi-do 17104, Republic of Korea;6. Graduate School of Energy and Environment, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Republic of Korea |
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| Abstract: | The thermal stability of the solid electrolyte interphase (SEI) formed on a graphite anode has been enhanced by adding an anion receptor, tris(pentafluorophenyl)borane (TPFPB), to the electrolyte. The investigated electrolyte was LiBF4 in a 2:1 mixture of ethylene carbonate (EC) and diethyl carbonate (DEC). Two concentrations of TPFPB have been investigated, 0.2 and 0.8 M. Galvanostatic cycling and differential scanning calorimetry (DSC) were used to study the effect of TPFPB on the electrochemical performance and thermal stability of graphite anodes. The best performance is obtained for a graphite anode cycled in an electrolyte with 0.2 M TPFPB: cyclability is improved, and the onset temperature for the first thermally activated reaction is increased by more than 60 °C up to 140–160 °C. X-ray photoelectron spectroscopy (XPS) has been used to examine the composition of the SEI formed in the different electrolytes; the improved performance for the graphite cycled with 0.2 M TPFPB is attributed to a reduced amount of LiF in the SEI. |
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