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수분산 폴리우레탄 및 탄소나노섬유 복합체의 물리적 특성
임석대(Suk-Dae Lim),고상철(Sang-Choel Ko),곽이구(Lee-Ku Kwac) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.11
In this study, the electrical and mechanical properties of carbon polymer composites, which have been gradually increasing in use in various fields, were investigated, and environment-friendly carbon nanofiber/waterborne polyurethane composites were prepared. Carbon nanofibers (diameter = approximately 100–300 mm) were synthesized using a relatively simple CVD process, obtaining a carbon material for application in ultrathin planar heating films and EMP shielding films in the future. The carbon nanofiber was dispersed, and mixed with water-dispersible polyurethane using a dispersing aid. According to the carbon nanofiber mass ratio, 20%–60% polyurethane/carbon nanofiber composites were manufactured. At a concentration of approximately 20%, the percolation threshold was determined, and at a concentration of approximately 50%, an electrical conductivity greater than 0.1 S/cm was determined. Moreover, a sample having a concentration of up to 60% was evaluated to further understand the mechanical properties. It was observed that as the concentration of the carbon nanofibers increased, the elongation decreased.
팽창흑연 복합소재를 이용한 리튬 배터리의 화재 및 열 폭주 억제 기술에 관한 연구
임석대(Suk-Dae Lim),곽이구(Lee-Ku Kwac),김홍건(Hong-Gun Kim),김진수(Jin-Soo Kim),박시호(Si-Ho Park) 한국기계가공학회 2023 한국기계가공학회지 Vol.22 No.7
In the rapidly growing electric vehicle battery market, the fire hazard caused by thermal runaway is an essential problem that needs to be solved. To prevent thermal runaway, many studies are being conducted, such as the development of effective thermal management systems, stabilization of electrolytes, use of new materials and designs for more stable battery manufacturing, and reduction of battery defects through manufacturing process improvements. Expanded graphite can withstand high temperatures, so it is widely used as a non-combustible material and a non-combustible coating compound. Composites prepared using expanded graphite form a thick air layer by the expanded graphite during a fire. As this air layer blocks high-temperature radiant heat generated by the fire, it can be applied as a non-combustible material or a fire and heat resistant material. In this study, a composite material consisting of expanded graphite was manufactured, and experiments were conducted to investigate its effectiveness in suppressing fires and thermal runaway in lithium batteries, utilizing the thermal physical properties of expanded graphite. We verified that this material can be a viable alternative for effectively blocking heat and preventing large-scale fires caused by heat transfer to adjacent batteries and continuous explosions.