分离器(采油)
聚烯烃
法拉第效率
聚乙烯
电解质
热稳定性
润湿
涂层
复合数
化学工程
锂离子电池
材料科学
收缩率
化学
复合材料
有机化学
电极
电池(电)
工程类
物理化学
功率(物理)
物理
热力学
图层(电子)
量子力学
作者
Qun Gu,Hongjin Xue,Zhanwei Li,Jiao-Jiao Song,Zhaoyan Sun
标识
DOI:10.1016/j.jpowsour.2020.229155
摘要
In lithium-ion batteries, separator serves to isolate the positive and negative electrodes, as well as provide a free shuttle for Li-ion transport inside the battery. Commercial polyolefin separator has relatively higher thermal shrinkage and lower electrolyte wettability, which limits the application of batteries in extreme conditions. In this work, we prepared phenolic resin (AF) modified polyethylene (PE) composite separators by the process of immersion in situ reaction. The obtained [email protected] composite separator has lower thermal shrinkage and higher electrolyte wettability than pure PE separator. The shrinkage of our prepared [email protected] separator is only 6% when stored at 145 °C for 30 min, greatly smaller than the pure PE separator (more than 77%). Moreover, the ion conductivity of [email protected] composite separator increases from 0.206 mS cm−1 for the pure one to 0.604 mS cm−1. Apart from this, the Li/electrolyte-soaked [email protected] separator/LiFePO4 battery exhibits a higher coulombic efficiency (96.7%) and discharge capacity retention rate (86.0%) after 450 cycles than the pure one (67.4% and 72.7%, respectively). Our results indicate that the AF coating plays a vital part in improving the thermal stability and electrochemical property of polyolefin separators.
科研通智能强力驱动
Strongly Powered by AbleSci AI