Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Nano Ceramic Coating on Polypropylene Separator for Safety-Enhanced Lithium Secondary Battery

고안전성 리튬이차전지 구현을 위한 나노 세라믹 코팅 분리막 제조 및 전기화학특성 분석

  • Lee, Jungmo (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Jeon, Hyunkyu (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Han, Taeyeong (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Ryou, Myung-Hyun (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Lee, Yong Min (Department of Chemical and Biological Engineering, Hanbat National University)
  • 이정모 (한밭대학교 화학생명공학과) ;
  • 전현규 (한밭대학교 화학생명공학과) ;
  • 한태영 (한밭대학교 화학생명공학과) ;
  • 유명현 (한밭대학교 화학생명공학과) ;
  • 이용민 (한밭대학교 화학생명공학과)
  • Received : 2017.01.10
  • Accepted : 2017.05.05
  • Published : 2017.05.31
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Abstract

Herein, we have fabricated an ultrathin aluminum oxide ($Al_2O_3$) coated PP separator by using a RF sputter deposition process. Approximately 20 nm thickness coating layer on the bare PP separator was formed at the power of 55 W for 2 minutes without thermal damage. Whereas only permeability of the coated separator was degraded slightly, other properties such as thermal stability, uptake amount of liquid electrolyte, and ionic conductivity were improved comparing to the bare PP separator. As a result, an only 20-nm-thick $Al_2O_3$ coating layer could improve the rate capability compared with a bare PP separator under a high current density.

폴리올레핀 분리막의 내열성을 향상시키면서도 전기화학특성 개선을 위해 RF Magnetron Sputter기반으로 수십 나노미터 수준의 세라믹 층이 코팅된 내열 분리막을 제조하였다. 분리막 원단의 열적 손상없이 코팅 시간을 최소화하기 위한 증착 조건을 최적화 하였고, 이를 기반으로 제조된 내열 분리막의 물리적, 전기화학적 평가를 진행하였다. 약 20 nm의 $Al_2O_3$가 코팅된 Polypropylene(PP) 분리막은 원단 분리막 대비 통기 특성 (원단: 211.3 sec/100 mL, 코팅 분리막: 250.8 sec/100 mL)은 떨어졌으나, 열 수축율 (원단: 19.4%, 코팅 분리막: 0.0% @ $140^{\circ}C$ & 30 min), 전해액 Uptake(원단: 176%, 코팅 분리막: 190%) 및 이온전도도 (원단: 0.700 mS/cm, 코팅 분리막: 0.877 mS/cm)는 모두 향상되었다. 그 결과, 2032-type Half-cell($LiMn_2O_4/Li$)을 이용한 전기화학적 평가에서도, 향상된 율별 특성과 유사한 수명 특성을 나타내었다.

Keywords

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