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

Nano Ceramic Coating on Polypropylene Separator for Safety-Enhanced Lithium Secondary Battery

유명현|이용민|이정모|전현규|한태영
한국전기화학회 (The Korean Electrochemical Society)|2017.05|전기화학회지 (Journal of the Korean Electrochemical Society)|제20권 제2호|pp. 41-48

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키워드

Thermal stabilityLithium secondary batteryCeramic coated separatorRF sputter
주제분류화학

초록

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 Al2O3가 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% @140oC & 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(LiMn2O4/Li)을 이용한 전기화학적 평가에서도, 향상된 율별 특성과 유사한 수명 특성을 나타내었다.

Abstract

Herein, we have fabricated an ultrathin aluminum oxide (Al2O3) 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 Al2O3 coating layer could improve the rate capability compared with a bare PP separator under a high current density.

참고문헌 (21)

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