Kim Tae Hyung, Kim MinSu, Kim Eun Ji, Ju Minu, Kim Ji Soo, Lee Seung Hee
Department of Nano Convergence Engineering, Jeonbuk National University, Jeonju 54896, Republic of Korea.
Department of JBNU-KIST Industry-Academia Convergence Research, Jeonbuk National University, Jeonju 54896, Republic of Korea.
Polymers (Basel). 2024 Jan 29;16(3):357. doi: 10.3390/polym16030357.
The growing interest in wearable and portable devices has stimulated the need for flexible and stretchable lithium-ion batteries (LiBs). A crucial component in these batteries is the separator, which provides a pathway for Li-ion transfer and prevents electrode contact. In a flexible and stretchable LiB, the separator must exhibit stretchability and elasticity akin to its existing counterparts. Here, we developed a non-modified thermoplastic polyurethane (TPU) separator using the non-solvent induced phase separation (NIPS) technique. We compared their performance with commercially available polypropylene (PP) separators. Our results demonstrate that TPU separators exhibit superior elasticity based on repeated stretch/release tests with excellent thermal stability and electrolyte wettability. Furthermore, our findings confirm that TPU separators, even after being repeatedly stretched and released, can function effectively without severe damage in a fabricated coin cell LiB with high oxidative stability, as evidenced by linear sweep voltammetry, like commercially available separators.
对可穿戴和便携式设备日益增长的兴趣激发了对柔性和可拉伸锂离子电池（LiBs）的需求。这些电池中的一个关键组件是隔膜，它为锂离子传输提供路径并防止电极接触。在柔性和可拉伸的锂离子电池中，隔膜必须表现出与其现有同类产品相似的拉伸性和弹性。在此，我们使用非溶剂诱导相分离（NIPS）技术开发了一种未改性的热塑性聚氨酯（TPU）隔膜。我们将它们的性能与市售聚丙烯（PP）隔膜进行了比较。我们的结果表明，基于重复拉伸/释放测试，TPU隔膜表现出优异的弹性，具有出色的热稳定性和电解质润湿性。此外，我们的研究结果证实，TPU隔膜即使在反复拉伸和释放后，在制造的硬币型锂离子电池中也能有效发挥作用，而不会受到严重损坏，具有高氧化稳定性，线性扫描伏安法证明了这一点，与市售隔膜一样。
