New polymerized ionic liquid (PIL) gel electrolyte membranes based on tetraalkylammonium cations for lithium ion batteries

作者：Li, Mingtao^*; Yang, Bolun; Wang, Lu; Zhang, Ying; Zhang, Zhan; Fang, Shaohua; Zhang, Zhengxi

来源：Journal of Membrane Science, 2013, 447: 222-227.

DOI：10.1016/j.memsci.2013.07.007

• Polymerized ionic liquids
• Ionic conductivity
• Lithium polymer batteries
• Tetraalkylammonium-based ionic liquids

New polymerized ionic liquids (PILs) based on tetraalkylammonium cations with N(CF3SO2)(2)(-) (TFSI-) anions are synthesized by homopolymerization and anion exchange reaction. Furthermore, a gel polymer electrolyte membrane based on the Pits as polymer host is prepared incorporating a tetraalkylammonium ionic liquid, LiTFSI salt and nano size SiO2. The gel polymer electrolyte membranes show exceptional thermal and electrochemical properties. They are found to be thermally stable up to 336 degrees C With the increase of the IL, T-g of the PIL-based electrolyte samples decreases obviously. When the IL concentration is 25 wt%, the ionic conductivity of the electrolytes reaches 4.9 x 10(-4) S cm(-1) at 60 degrees C. After 130 cycles, the Li/LiFePO4 battery with the gel polymer electrolyte membranes at 60 degrees C has discharge capacity of 122 mA h g(-1) at 0.1 current rates.

• 出版日期2013-11-15
• 单位上海交通大学; 西安交通大学