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리튬이차전지용 분리막 적용을 위한 α-알루미나 분말 제조 최적화 연구
문동명,현다은,오지희,전좌빈,김용남,정경훈,이종근,구상모,이동원,오종민 한국전기전자재료학회 2023 전기전자재료학회논문지 Vol.36 No.6
Recently, active research has been conducted to enhance the power characteristics and thermal stability of lithiumion batteries (LiBs) by modifying separators using a ceramic coating method. However, since the thermal properties and surface features of the separator vary depending on the characteristics of the ceramic powders applied to the separator, it is crucial to manufacture ceramic powders optimized for the separator’s performance. In this study, we evaluated the characteristics of three types of α-alumina (A-1, A-2, and A-3) produced with varying dispersant contents and milling times, in addition to commercial α-alumina (AES-11). Subsequently, the optimized powders (A-3) were coated onto the separator using an aqueous binder for comparison with the characteristics of an AES-11 coated separator and an uncoated PE separator. The A-3 coated separator improved electrolyte wettability with a low contact angle (44.69°) and increased puncture strength (538 gf). Furthermore, it exhibited excellent thermal stability, with a shrinkage value of 5.64% when exposed to 140℃ for 1 hour, compared to the AES-11 coated separator (6.09%) and the bare PE separator (69.64%).
리튬이차전지용 분리막 적용을 위한 α-알루미나 분말 제조 최적화 연구
문동명,현다은,오지희,전좌빈,김용남,정경훈,이종근,구상모,이동원,오종민,Dong-Myeong Moon,Da-Eun Hyun,Ji-Hui Oh,Jwa-Bin Jeon,Yong-Nam Kim,Kyoung-Hoon Jeong,Jong-Kun Lee,Sang-Mo Koo,Dong-Won Lee,Jong-Min Oh 한국전기전자재료학회 2023 전기전자재료학회논문지 Vol.36 No.6
Recently, active research has been conducted to enhance the power characteristics and thermal stability of lithium-ion batteries (LiBs) by modifying separators using a ceramic coating method. However, since the thermal properties and surface features of the separator vary depending on the characteristics of the ceramic powders applied to the separator, it is crucial to manufacture ceramic powders optimized for the separator's performance. In this study, we evaluated the characteristics of three types of α-alumina (A-1, A-2, and A-3) produced with varying dispersant contents and milling times, in addition to commercial α-alumina (AES-11). Subsequently, the optimized powders (A-3) were coated onto the separator using an aqueous binder for comparison with the characteristics of an AES-11 coated separator and an uncoated PE separator. The A-3 coated separator improved electrolyte wettability with a low contact angle (44.69°) and increased puncture strength (538 gf). Furthermore, it exhibited excellent thermal stability, with a shrinkage value of 5.64% when exposed to 140℃ for 1 hour, compared to the AES11 coated separator (6.09%) and the bare PE separator (69.64%).