A novel organosilicon-based ionic plastic crystal as solid-state electrolyte for lithium-ion batteries |
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| Authors: | Xin-yue Zhao Jing-lun Wang Hao Luo Hu-rong Yao Chu-ying Ouyang Ling-zhi Zhang |
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| Institution: | 1.Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou,China;2.College of Physics and Communication Electronics,Jiangxi Normal University,Nanchang,China |
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| Abstract: | A novel organosilicon-based ionic plastic crystal, N,N,N,-diethylmethyl-N-(trimethylsilyl)methyl]ammonium bistrifluoromethane sulfonimide (DTMA]TFSI]) was designed and synthesized as solid-state electrolyte for lithium-ion batteries. The chemical structure and the physical and electrochemical properties were characterized in detail. The ionic conductivity of DTMA]TFSI] was improved significantly by doping with lithium oxalyldifluoroborate (LiODFB) and propylene carbonate (PC). An optimized plastic crystal composite (DTMA]TFSI]:LiODFB:PC=8:1:1 in molar ratio) as a solid-state electrolyte exhibited a decent cycling stability in LiFePO4/Li half-cell, with a specific discharge capacity of 144 mA·h/g and capacity retention of 94% after 50 cycles at C/20. |
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