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The Preparation of Novel Lithium Ion Battery Separator by Plasma Technology

Author: ZhuHuiQin
Tutor: ChenQiang
School: Beijing Institute of Printing
Course: Materials Physics and Chemistry
Keywords: PECVD microporous polypropylene membrane lithium-ion battery SiO_x property
CLC: TM912
Type: Master's thesis
Year: 2010
Downloads: 243
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Abstract


The microporous polypropylene separator of Li-ion battery was modified by SiOx coating via plasma enhanced vapor chemical deposition （PECVD） technology. For the purpose of improvement the thermal stability of separator and safety of the battery, the investigation of the sort of plasmas （Ar, O2） and SiOx coating on thermal shrinkage, wetting property, mechanical property, anti-corrosion of electrolyte and electrical performance of membrane were performed in this thesis.In here the radio frequency （13.56MHz） capacitively coupled plasma was employed to deposited SiOx coating, in which oxygen gas and hexamethyldisiloxane （HMDSO） were used as oxidant and monomer, respectively, and argon was utilized as a diluted gas. The chemical structure of as-deposited SiOx coatings was characterized by Fourier transform infrared spectroscope （FTIR）. Scanning electron microscope （SEM） and atomic force microscope （AFM） were utilized to scan the morphology of coatings. The wettabilty and the deposition rate of SiOx coating were measured by the water contact angle and step profiler, respectively. The influence of SiOx coating on the membrane’s mechanical property, porosity, electrolyte adsorption rate was emphasized in this work. Finally, button-type batteries used the treated and coated membranes as separators were assembled to evaluate the possibility by the measurement of C rates charge/discharge, cycle performance and AC impedance. The following results were concluded:1. The water contact angles of the SiOx matrix were increased along with the decrease of O2 concentration. The maximum deposition rate of SiOx was attained at O2: HMDSO ratio of 1:2;2. The O2 plasma treatment demonstrated a remarkable improvement of the wettability, porosity and electrolyte adsorption rate. Both Ar and O2 plasma treatments damaged the membrane mechanical property;3. When the ratio of O2: HMDSO at 8:1 the water contact angle of SiOx coated membrane could achieve about 36°. The thermal shrinkage of the membranes after coated SiOx was significantly improved.4. The electrochemical tests showed that the SiOx coated separator didn’t decrease the battery charge/discharge capacity and cycle ability rather than the impendence of the battery system. There were some abnormal performances when the SiOx coating was excess thickness.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery
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