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소혜미(Hye-Mi So),박철민(Cheolmin Park),장원석(Won Seok Chang) 대한기계학회 2014 大韓機械學會論文集B Vol.38 No.7
일반적으로 표면적/부피비가 큰 전도성 다공체는 수퍼캐패시터의 전극이나 흡수제, 유연히터 등의 다양한 분야에 적용되어 왔다. 본 논문에서는 이러한 전도성 다공성 구조의 역학적·전기적 특성을 이용하여 고감도 압력센서를 구현하였다. 탄소나노튜브 용액에 스펀지를 적셔 다공체에 전도성을 부여하였으며, 압력에 따른 전도성 다공체의 저항 변화를 측정하였다. 전도성 스펀지에 압력이 가해졌을 때, 각각의 탄소나노튜브들은 서로 맞붙게 되어 저항이 최대 20%까지 줄어듦을 확인하였다. 부드럽고 탄성력이 뛰어난 탄소나노튜브 스폰지는 반복적인 압축실험에도 모양의 변형 없이 매우 빠르게 안정화되고 일정한 저항변화를 확인할 수 있었다. 또한 스펀지 압력소자를 유연소자에 적용하기 위하여 탄소나노튜브 트랜지스터와 연결하여 외부압력에 따른 전기적 특성변화를 측정하였다. Porous conductors are known to demonstrate excellent electrical, mechanical, and chemical resistance. These porous conductors demonstrated potential applications in various fields such as electrodes for supercapacitors, flexible heaters, catalytic electrodes, and sorbents. In this study, we described a pressure sensitive device using conductive and porous sponges. With an extremely simple “dipping and drying” process using a single-walled carbon nanotube (SWCNT) solution, we produced conductive sponges with sheet resistance of < 30 kΩ/sq. These carbon nanotube sponges can be deformed into any shape elastically and repeatedly compressed to large strains without collapse. The pressure sensors developed from these sponges demonstrated high resistance change under pressure of up to a half of their initial resistance.
Band-type Flexible Li Primary and Secondary Batteries
H. M. So(소혜미),H. H. Ha(하현호),S. M. Hyun(현승민) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
As the demand for wearable devices such as smart watches increases rapidly, a change in power supply suitable for this is required. Currently, most power sources are still rigid and have limited deformation, which is rather inconvenient to apply to the human body. Many studies on flexible batteries to solve this problem have been reported, and among them, an one-dimensional batteries will be highly compatible wearable battery that can be woven into various fabrics due to its flexibility and ease of integration with fibers. In this study, we fabricated band-type lithium primary and secondary batteries and analyzed their electrochemical properties. The manufactured band-type lithium secondary battery is flexible and has excellent initial capacity, but it has been confirmed that the capacity decreases when charging and discharging are repeated. Unlike the conventional coin cell or pouch cell in which the cell components and assembly equipment are standardized, this is believed to be because that the band-type lithium secondary battery has a large aspect ratio and high water vapor transmission rate (WVTR) of the packing material. However, if the assembly process is optimized and suitable packaging materials are secured, 1-D fiber batteries can be expanded into flexible power fibers through weaving.