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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received November 20, 2022
Revised March 11, 2023
Accepted May 1, 2023

Acknowledgements: This work was supported by the Graduate School of Post Plastic specialization of Korea Environmental Industry & Technology Institute grant funded by Ministry of Environment, Republic of Korea

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Electrospun PVDF-HFP/PAN bicomponent nanofibers as separators in lithium-ion batteries with high thermal stability and electrolyte wettability

Jaeseon Lee^{1 2} Jinsoo Yoon¹ Jaesung Jeon³ Yohan Hong⁴ Seong-Geun Oh^1† Hoon Huh^2†

¹Department of Chemical Engineering, Hanyang University, Seoul 04763, Korea ²Carbon Neutral Technology R&D Department, Korea Institute of Industrial Technology, Cheonan, Chungnam 31056, Korea ³Department of Materials Science and Engineering, Inha University, Incheon 22212, Korea ⁴Grapsil, Korea Institute of Industrial Technology, Cheonan, Chungnam 31056, Korea

seongoh@hanyang.ac.kr, huhoon@kitech.re.kr

Korean Journal of Chemical Engineering, August 2023, 40(8), 1901-1911(11), 10.1007/s11814-023-1486-z

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Abstract

Battery reliability is emerging as a new challenge due to the thermal stability and electrolyte wettability of polyolefin separators used in lithium-ion batteries. In this study, a method to improve the thermal stability and electrolyte wettability of a polyolefin separator is proposed. Bicomponent nanofibers were successfully fabricated by electrospinning poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) with high ionic conductivity and polyacrylonitrile (PAN) with excellent thermal stability. The nanofiber-based separator of PVDF-HFP/PAN exhibited high porosity (60-76%), electrolyte uptake (2,000%), and thermal stability (5%<shrinkage, at 200 o C) than conventional polyolefin separator. The battery using the bicomponent nanofiber separator composed of PVDF-HFP and PAN showed better cycle performance (421 mAh/g, after 80 cycle), efficiency (99.6%), and c-rate performance (418 mAh/g, 3C) than the battery using polyolefin separator.

Keywords

Electrospinning, Bicomponent Nanofiber PVDF-HFP/PAN Thermal Stability Electrolyte Wettability Separator

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