Zhang Wei, Ryu Taewook, Yoon Sujin, Jin Lei, Jang Giseok, Bae Wansu, Kim Whangi, Ahmed Faiz, Jang Hohyoun
Department of Applied Chemistry, Konkuk University, Chungju 27478, Korea.
Grenoble INP, LEPMI, University of Grenoble Alpes, 38000 Grenoble, France.
Membranes (Basel). 2022 Apr 18;12(4):439. doi: 10.3390/membranes12040439.
The polymer electrolytes are considered to be an alternative to liquid electrolytes for lithium-ion batteries because of their high thermal stability, flexibility, and wide applications. However, the polymer electrolytes have low ionic conductivity at room temperature due to the interfacial contact issue and the growing of lithium dendrites between the electrolytes/electrodes. In this study, we prepared gel polymer electrolytes (GPEs) through an in situ thermal-induced cationic ring-opening strategy, using LiFSI as an initiator. As-synthesized GPEs were characterized with a series of technologies. The as-synthesized PNDGE 1.5 presented good thermal stability (up to 150 °C), low glass transition temperature (Tg < −40 °C), high ionic conductivity (>10−4 S/cm), and good interfacial contact with the cell components and comparable anodic oxidation voltage (4.0 V). In addition, PNGDE 1.5 exhibited a discharge capacity of 131 mAh/g after 50 cycles at 0.2 C and had a 92% level of coulombic efficiency. Herein, these results can contribute to developing of new polymer electrolytes and offer the possibility of good compatibility through the in situ technique for Li-ion batteries.
聚合物电解质因其高热稳定性、柔韧性和广泛应用，被认为是锂离子电池液体电解质的替代品。然而，由于界面接触问题以及电解质/电极之间锂枝晶的生长，聚合物电解质在室温下具有较低的离子电导率。在本研究中，我们以LiFSI为引发剂，通过原位热诱导阳离子开环策略制备了凝胶聚合物电解质（GPEs）。采用一系列技术对合成的GPEs进行了表征。合成的PNDGE 1.5具有良好的热稳定性（高达150°C）、低玻璃化转变温度（Tg < -40°C）、高离子电导率（>10−4 S/cm），与电池组件具有良好的界面接触以及相当的阳极氧化电压（4.0 V）。此外，PNGDE 1.5在0.2 C下循环50次后，放电容量为131 mAh/g，库仑效率为92%。在此，这些结果有助于新型聚合物电解质的开发，并通过原位技术为锂离子电池提供良好兼容性的可能性。
