文献类型：期刊文献

英文题名：Polyimide binder by combining with polyimide separator for enhancing the electrochemical performance of lithium ion batteries

作者：Yan, Xinzhu[1]; Wang, Yaru[1]; Yu, Tao[1]; Chen, Hao[1]; Zhao, Zhibo[2]; Guan, Shiyou[1]

机构：[1] School of Materials Science and Engineering, East China University of Science and Technology, Mei Road 130, Long, Shanghai, 200237, China; [2] Shazhou High School of Zhangjiagang, Nan Yuan West Road 28, Zhangjiagang, 215600, China

年份：2016

卷号：216

起止页码：1

外文期刊名：Electrochimica Acta

收录：EI(收录号：20163702796892)

语种：英文

外文关键词：Thermogravimetric analysis - Lithium-ion batteries - Polyimides - Separators - Electrolytes - Ions

摘要：Lithium ion battery (LIB) has been assembled by a polyimide (PI) binder, which is prepared by one-pot solution polycondensation, and PI non-woven separator. Compared to the cell using the traditional PVDF binder and polyethylene (PE) separator, the cell with PI binder and PI separator (PI-PI) not only has a better thermal stability but also displays significantly improved electrochemical performance, especially rate performance and cycling behavior. The thermogravimetric analysis (TGA) shows that the temperature of the weight loss of 10% of PVDF and PI is 464.6°C and 525.9°C, respectively. The properties of the separator, including wettability, electrolyte uptake and mechanical performance are tested. Owing to the hydrophilic imide group and the rigid aromatic nucleus. These properties make a possibility of a battery to meet higher requirements. In the terms of electrochemistry, when the current density over 1C, the cell with PVDF binder and PE separator (PVDF-PE) only retains no more than 61% of its capacity at a rate of 0.05C. However the cell that based on PI-PI still maintains 72.6%. Besides, the cycle performance of PI-PI gains a significant improvement. It can stay over 85% capacitance retention ratio after 200 cycles at a rate of 1C, while the PVDF-PE is only 57.68%. The outstanding improvement of the rate capability is due to the reduction of internal resistance of the battery. ? 2016 Elsevier Ltd