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http://dx.doi.org/10.5229/JKES.2012.15.1.048

Fabrication and Evaluation of Si3N4-coated Organic/inorganic Hybrid Separators for Lithium-ion Batteries  

Yeo, Seung-Hun (Department of Applied Chemistry, Kumoh National Institute of Technology)
Son, Hwa-Young (Department of Applied Chemistry, Kumoh National Institute of Technology)
Seo, Myeong-Su (Bexel)
Roh, Tae-Wook (Technology & Science Enterprise)
Kim, Gyu-Chul (Cell & Separator Technoloiges)
Kim, Hyun-Il (Cell & Separator Technoloiges)
Lee, Ho-Chun (Energy Systems Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST))
Publication Information
Journal of the Korean Electrochemical Society / v.15, no.1, 2012 , pp. 48-53 More about this Journal
Abstract
Polyethylene (PE) separator is the most popular separator for lithium-ion batteries. However, it suffers from thermal contraction and mechanical rupture. In order to improve the thermal/mechanical dimensional stabilities, this study investigated the effects of $Si_3N_4$ coating. SCS (Silicon-nitride Coated Separator) has been fabricated by applying 10 ${\mu}m$-thick $Si_3N_4$/PVdF coating on one side of PE separator. SCS exhibits enhanced thermal stability over $100{\sim}150^{\circ}C$: its thermal shrinkage is reduced by 10~20% compared with pristine PE separator. In addition, SCS shows higher tensile strength than PE separator. Employing SCS hardly affects the C-rate performance of $LiCoO_2$/Li coin-cell, even though its ionic conductivity is somewhat lower than that of PE separator.
Keywords
Ceramic-coated separator; $Si_3N_4$; Polyethylene separator; Lithium-ion battery;
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