无粘合剂的薄膜陶瓷涂层隔膜，可改善锂离子电池的安全性,ACS Omega

当前位置： X-MOL 学术 › ACS Omega › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

无粘合剂的薄膜陶瓷涂层隔膜，可改善锂离子电池的安全性
ACS Omega ( IF 3.7 ) Pub Date : 2021-02-03 , DOI: 10.1021/acsomega.0c05037
Ashish Gogia _{1,

2} , Yuxing Wang ₁ , Amarendra K. Rai ₃ , Rabi Bhattacharya ₃ , Guru Subramanyam ₂ , Jitendra Kumar _{1,

2}

Affiliation

隔膜在确保锂离子电池（LIB）的安全性中起着至关重要的作用。诸如聚乙烯（PE）之类的商用聚烯烃基隔膜由于其热稳定性差，在滥用条件下仍具有严重的安全风险。在这项工作中，展示了一种新型的无粘结剂，薄陶瓷涂层隔膜，具有出色的安全特性。氧化铝薄层（Al ₂ O ₃）使用电子束物理气相沉积（EB-PVD）技术涂覆在商用PE隔膜上。扫描电子显微镜（SEM），接触角，阻抗谱和附着力测试技术被用来评估结构-特性的相关性。与商用浆料涂覆的隔板相比，EB-PVD涂覆的隔板表现出（i）更高的热稳定性，（ii）更高的陶瓷-聚合物粘合性以及（iii）完整LIB电池的竞争性电化学性能。在高达190°C的条件下，使用原位阻抗技术研究了热稳定性，以改善隔板的关闭和击穿特性。另外，在胶带粘合强度测试之后，研究了沉积在PE隔板上的陶瓷层的改进的粘合性。

"点击查看英文标题和摘要"

Binder-Free, Thin-Film Ceramic-Coated Separators for Improved Safety of Lithium-Ion Batteries

Separators play a crucial role in ensuring the safety of lithium-ion batteries (LIBs). Commercial polyolefin-based separators such as polyethylene (PE) still possess serious safety risks under abuse conditions because of their poor thermal stability. In this work, a novel type of binder-free, thin ceramic-coated separators with superior safety characteristics is demonstrated. A thin layer of alumina (Al₂O₃) is coated on commercial PE separators using the electron-beam physical vapor deposition (EB-PVD) technique. Scanning electron microscopy (SEM), contact angle, impedance spectroscopy, and adhesion test techniques were employed to evaluate structure–property correlations. When compared to commercial slurry-coated separators, the EB-PVD-coated separators display (i) higher thermal stability, (ii) stronger ceramic–polymer adhesion, and (iii) competitive electrochemical performance of full LIB cells. Thermal stability, in terms of improved shutdown and breakdown characteristics of the separator, was studied using the in situ impedance technique up to 190 °C. In addition, the improved adhesion of the ceramic layer deposited on the PE separator was studied following the tape adhesion strength test. We prove that the thin (binder-free) ceramic layer coated by EB-PVD is far more effective in improving separator safety than those made using the conventional thick slurry coating.

更新日期：2021-02-16

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文本刊介绍/投稿指南