Effects of low-pressure nitrogen plasma treatment on the surface properties and electrochemical performance of the polyethylene separator used lithium-ion batteries

In this paper, we describe the surface transition of the polyethylene (PE) separator used in lithium-ion batteries treated by low-pressure nitrogen plasma discharge. The nitrogen-plasma-treated PE separator was characterized by contact angle measurement, Fourier transform infrared spectroscopy, X-ra...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2018-01, Vol.57 (1S), p.1
Main Authors: Li, Chun, Li, Hsiao-Ling, Li, Chi-Heng, Liu, Yu-Shuan, Sung, Yu-Ching, Huang, Chun
Format: Article
Language:English
Subjects:
Contact angle
Contact pressure
Discharge
Electrochemical analysis
Fourier transforms
Free energy
Lithium
Lithium-ion batteries
Nitrogen
Nitrogen plasma
Polyethylene
Polyethylenes
Pressure effects
Rechargeable batteries
Scanning electron microscopy
Spectrum analysis
Surface properties
Wettability
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Summary:In this paper, we describe the surface transition of the polyethylene (PE) separator used in lithium-ion batteries treated by low-pressure nitrogen plasma discharge. The nitrogen-plasma-treated PE separator was characterized by contact angle measurement, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy. The electrochemical performance of the lithium ion batteries fabricated with the nitrogen-plasma-treated separator was also evaluated. Results showed that polar functionalization groups were induced on the PE surface by the nitrogen plasma discharge, causing the surface to become hydrophilic. The increases in surface wettability and surface free energy result in electrolyte retention improvement. Moreover, the nitrogen plasma-treated PE separator leads to superior performance in lithium-ion battery assembly.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.57.01AB03