콘텐츠 본문
논문 해외 국제전문학술지(SCI급) Synergistic thermal stabilization of ceramic/co-polyimide coated polypropylene separators for lithium-ion batteries
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2015-10
- 저자명 Yunju Lee, Hoogil Lee, Taejoo Lee, Myung-Hyun Ryou, Yong Min Lee
- 학술지명 Journal of Power Sources
- 발행처명 Elsevier
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 5
- 논문 다운로드 링크(외부) https://doi.org/10.1016/j.jpowsour.2015.06.106
- 연구분야 공학 > 화학공학
논문 초록 (Abstract)
To improve the safety of lithium-ion batteries (LIBs), co-polyimide (PI) P84 was introduced as a polymeric binder for Al2O3/polymer composite surface coatings on polypropylene (PP) separators. By monitoring the dimensional shrinkage of the PP separators at high temperatures, we verified a synergistic thermal stabilization effect between the Al2O3 ceramic and the PI polymeric binder. Although PI was thermally stable up to 300 °C, a coating consisting solely of PI did not impede the PP separator dimensional changes (−22% at 150 °C). On the other hand, the Al2O3/PI-coated PP separators efficiently impeded the thermal shrinkage (−10% at 150 °C). In contrast, an Al2O3/poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) combination lowered the thermal stability of the PP separators (−33% at 150 °C). As a result, the Al2O3/PI-coated PP separators remarkably suppressed the internal short-circuit of the unit half-cells associated with separator thermal shrinkage (100 min at 160 °C), whereas the PVdF-HFP retained only 40 min under identical conditions. The Al2O3/PI-coated PP separators achieved rate capabilities and cell performances similar to those of the bare PP separators.
