| Summary: | 碩士 === 元智大學 === 化學工程與材料科學學系 === 101 === The aim of this research is to modify polymeric separator surface by monatomic gas plasma activation and organic monomer plasma chemical vapor deposition. Both of these two methods are belong to plasma surface modification mechanisms. Treatment time, plasma power and hydrocarbon/nitrogen gas flow ratio are varied during process. In order to realize that efficiency of separator in lithium-ion battery, the separators are used to fabricate coin-cell batteries after plasma treatment.
To perform surface analysis, the wettability and surface free energy are measured by static Contact angle (CA) device. During plasma process, the photoemission species and glow discharge photo are obtained by Optical Emission Spectroscopy (OES) for plasma diagnosis and digital camera. Capillary Flow Porometry (CFP) is able to determine pore distribution on material surface. In addition, Scanning Electron Microscope (SEM) can represent surface morphology. Function group and element ratio on modified membranes are demonstrated by Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS) instruments. In the case of electrochemical properties, Electrochemical Impedance Spectroscopy (EIS) and battery automation test systems are used in this study.
From the experiment results, the modified separators show the better hydrophilic/hydrophobic properties and electrochemical performance after plasma treatment. It can be demonstrated that plasma is a excellent way to modify polymeric substrates.
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