화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.45, No.3, 456-463, May, 2021
DOI10.7317/pk.2021.45.3.456  Export Citation
리튬이온 이차전지용 미세다공성 폴리에틸렌 분리막의 열적 안정성 향상을 위한 내열 고분자층 코팅
Coating of Heat-resistant Polymeric Layer to Enhance Thermal Stability of Microporous Polyethylene Separator for Lithium-ion Secondary Battery
성정문, 박준영, 정현욱†
  • 고려대학교 화공생명공학과
Jungmoon Sung, Junyoung Park, and Hyun Wook Jung†
  • Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea
E-mail:
초록
에너지 밀도가 높은 리튬이온 이차전지 제조를 위해 폴리올레핀계 분리막에 향상된 열 안정성을 부여하는 것이 매우 중요하다. 이러한 목적을 위해 본 연구에서는 내열성 폴리아미드이미드(PAI) 고분자 용액을 미세다공성 구조의 폴리에틸렌(PE) 분리막에 연속 슬롯 코팅 공정을 적용하여 나노 크기의 박막 코팅 두께로 도포하였다. 적외선분광 분석(ATR-FTIR)과 전자현미경(SEM) 측정을 통해 미세다공성 막에 PAI의 박막 코팅을 확인하였고, 막 표면과 단면에서 PAI 코팅량과 기공 구조 변화의 관계를 규명하였다. 또한 PAI 코팅 전후 투과도, 기공도, 수축률 등 분리막의 다양한 특성치 변화를 체계적으로 고찰하였다. 이러한 실험 결과를 바탕으로 약 1.23 g/m2의 PAI 코팅량이 주로 활용된 PE-1 분리막의 내열 특성을 최적으로 향상시킴을 밝혔다.
It is very important to impart enhanced thermal stability to polyolefin-based separators for the fabrication of Li-ion secondary batteries with high energy density. For this purpose, in this study, a heat-resistant polyamide-imide (PAI) polymer solution was coated onto a microporous polyethylene (PE) separator with a nano-sized coating thickness, employing a continuous slot coating process. Through attended total reflection infrared spectroscopy (ATR-FTIR) and scanning electron microscope (SEM) measurements, a thin coating of PAI inside the microporous membrane was confirmed, and the relation between the PAI coating amount and the change in pore structures on membrane surface and cross-section was clearly identified. In addition, various characteristics of the separator such as permeability, porosity, and shrinkage before and after PAI coating were systematically investigated. Based on these experimental results, it was found that the PAI coating of 1.23 g/m2 optimally enhanced the heat resistance properties of the PE-1 separator.
Keywords:polyethylene separator;lithium-ion battery;slot coating;heat-resistant polyamide-imide;microporous structure
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