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

Si3N4-코팅 유/무기 복합 분리막을 통한 리튬이온전지용 분리막의 제조 및 평가

  • Received : 2012.02.08
  • Accepted : 2012.02.25
  • Published : 2012.02.28


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.


Ceramic-coated separator;$Si_3N_4$;Polyethylene separator;Lithium-ion battery


Supported by : 지식경제부, 대구경북과학기술원


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