Poly(ether ether ketone) Conferred Polyolefin Separators with High Dimensional Thermal Stability for Lithium-Ion Batteries,ACS Applied Materials & Interfaces

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Poly(ether ether ketone) Conferred Polyolefin Separators with High Dimensional Thermal Stability for Lithium-Ion Batteries
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-07-26 , DOI: 10.1021/acsami.3c05336
Yuhan Liu ₁ , Zijian Zhang ₁ , Xinwei Du ₂ , Yuliang Wang ₁ , Xiaohui Guo ₂ , Mengxuan Yu ₁ , Baijun Liu ₃ , Wei Hu ₁ , Li Shen ₄ , Yunfeng Lu ₅ , Guangshan Zhu ₁

Affiliation

The traditional polyolefin separators used in lithium-ion batteries (LIBs) are plagued by limitations such as poor wetting of electrolytes and insufficient thermal stability, hindering the progress of LIBs. To overcome these limitations, we have developed a modified phase inversion technique to efficiently and durably coat polyolefin separators with poly(ether ether ketone) (PEEK). The resulting PEEK-coated polyolefin separators exhibit mechanical properties similar to those of unmodified polyolefin separators, with comparable tensile strength and modulus. Furthermore, the PEEK coating provides outstanding thermal stability, as the modified separators maintain their stability even at temperatures up to 200 °C, which is among the best results reported for polyolefin-based separators. In addition, the PEEK coating enhances ionic conductivity by more than 100% compared to polyolefin counterparts, leading to significant improvement in the electrochemical performance of prototype half cells. The modified phase inversion technique presented here offers a practical solution for coating polyolefin separators with functional polymers, paving the way for next-generation separator materials.

中文翻译：

聚醚醚酮赋予锂离子电池高维热稳定性的聚烯烃隔膜

锂离子电池（LIB）中使用的传统聚烯烃隔膜存在电解液润湿性差和热稳定性不足等局限性，阻碍了锂离子电池的发展。为了克服这些限制，我们开发了一种改进的相转化技术，可以用聚醚醚酮 (PEEK) 高效、持久地涂覆聚烯烃隔膜。所得 PEEK 涂层聚烯烃隔膜表现出与未改性聚烯烃隔膜相似的机械性能，具有可比的拉伸强度和模量。此外，PEEK 涂层提供了出色的热稳定性，因为改进的隔膜即使在高达 200 °C 的温度下也能保持稳定性，这是聚烯烃基隔膜报告的最佳结果之一。此外，与聚烯烃涂层相比，PEEK涂层的离子电导率提高了100%以上，从而显着改善了原型半电池的电化学性能。这里提出的改进的相转化技术为用功能聚合物涂覆聚烯烃隔膜提供了实用的解决方案，为下一代隔膜材料铺平了道路。

更新日期：2023-07-26

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