• Title/Summary/Keyword: Ultrathin ceramic-coated separator

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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;Jeon, Hyunkyu;Han, Taeyeong;Ryou, Myung-Hyun;Lee, Yong Min
    • Journal of the Korean Electrochemical Society
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    • v.20 no.2
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    • pp.41-48
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    • 2017
  • 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.

A Review on Ultrathin Ceramic-Coated Separators for Lithium Secondary Batteries using Deposition Processes (증착 기법을 이용한 리튬이차전지용 초박막 세라믹 코팅 분리막 기술)

  • Kim, Ucheol;Roh, Youngjoon;Choi, Seungyeop;Dzakpasu, Cyril Bubu;Lee, Yong Min
    • Journal of the Korean Electrochemical Society
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    • v.25 no.4
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    • pp.134-153
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    • 2022
  • Regardless of a trade-off relationship between energy density and safety, it is essential to improve both properties for future lithium secondary batteries. Especially, to improve the energy density of batteries further, not only thickness but also weight of separators including ceramic coating layers should be reduced continuously apart from the development of high-capacity electrode active materials. For this purpose, an attempt to replace conventional slurry coating methods with a deposition one has attracted much attention for securing comparable thermal stability while minimizing the thickness and weight of ceramic coating layer in the separator. This review introduces state-of-the-art technology on ceramic-coated separators (CCSs) manufactured by the deposition method. There are three representative processes to form a ceramic coating layer as follows: chemical vapor deposition (CVD), atomic layer deposition (ALD), and physical vapor deposition (PVD). Herein, we summarized the principle and advantages/disadvantages of each deposition method. Furthermore, each CCS was analyzed and compared in terms of its mechanical and thermal properties, air permeability, ionic conductivity, and electrochemical performance.