S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
Co-polyimide-coated polyethylene separators for enhanced thermal stability of lithium ion batteries
- Song, Jongchan; Ryou, Myung-Hyun; Son, Bongki; Lee, Je-Nam; Lee, Dong Jin; Lee, Yong Min; Choi, Jang Wook; Park, Jung-Ki
- Issue Date
- Electrochimica Acta, Vol.85, pp.524-530
- The thermal shrinkage of the widely adopted polyethylene (PE) separators has become a very critical issue for safety in lithium ion batteries, especially for electrical vehicle applications. As an effort to minimize the thermal shrinkage of PE separators, in this study, we coat PE separators with a substance from the polyimide family by engaging a simple dipping method. A polymer coating at the optimal concentration endows PE separators with improved mechanical strength and thus remarkably increased resistance against thermal shrinkage at elevated temperatures. Despite the coating layers, the cells with the polyimide-coated separators exhibit almost identical electrochemical properties to those of the cells with the bare PE separators, thus proving that the polymer coating does not affect the battery performance. The preserved electrochemical properties can be explained by morphology and porosity characterization. (C) 2012 Elsevier Ltd. All rights reserved.
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