Poly(ether ether ketone)-Induced Surface Modification of Polyethylene Separators for Li-Ion Batteries

Yunjung Kim, Yong-Jin Jang, Hyungeun Seo, Je-Nam Lee, Sang-Gil Woo () and Jae-Hun Kim ()
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Yunjung Kim: School of Materials Science and Engineering, Kookmin University, Seoul 02707, Republic of Korea
Yong-Jin Jang: School of Materials Science and Engineering, Kookmin University, Seoul 02707, Republic of Korea
Hyungeun Seo: School of Materials Science and Engineering, Kookmin University, Seoul 02707, Republic of Korea
Je-Nam Lee: Advanced Batteries Research Center, Korea Electronics Technology Institute, Seongnam 13509, Republic of Korea
Sang-Gil Woo: Advanced Batteries Research Center, Korea Electronics Technology Institute, Seongnam 13509, Republic of Korea
Jae-Hun Kim: School of Materials Science and Engineering, Kookmin University, Seoul 02707, Republic of Korea

Energies, 2023, vol. 16, issue 2, 1-10

Abstract: With the global effort to reduce fossil fuels and to use eco-friendly energy, interest in Li-ion batteries (LIBs) is rapidly increasing. In the LIB system, the separator is an important component for determining the rate performance and safety of cells. Although polyolefin separators are commercially used in LIBs, they still suffer from inferior electrolyte wettability and low thermal stability issues. Here, we introduce a chemical surface modification for polyethylene (PE) separators using a poly(ether ether ketone) (PEEK) coating. The separators were pretreated in a tannic acid solution to enforce the adhesion of the coated layers. Then, PEEK was coated onto the PE surface by a doctor blading method. The separators were examined by infrared spectroscopy, and the surface properties were characterized by electrolyte uptake and contact angle measurements. The treated surface was hydrophilic, and the ionic conductivity of the cell with the modified separator was significantly improved. As a result, the corresponding rate performance was significantly improved. The surface modification strategy proposed here can be applied to polyolefin-based separators as well.

Keywords: surface modification; Poly(ether ether ketone); hydrophilic; separator; Li-ion battery (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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