In‐Suk Choi
서울대학교 재료공학부 · 공학
이 교수의 연구실은 도전적인 유연성과 내구성을 갖춘 전자 소자를 개발하는 데 초점을 맞추고 있습니다. 주요 연구 방향은 스트레인에 의한 전기적 성질 변화 이해, 유연한 전극의 피로 저항성 설계, 그리고 고성능 유연 배터리의 기계적 안정성 확보입니다. 특히, 기계적 변형에 강한 전도성 고분자, 나노홀을 통한 전극 설계, 그리고 특수 패턴화된 고무 기반 기판을 활용한 배터리 통합 기술이 핵심입니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Abstract It remains a fundamental challenge in the development of stretchable electronics to understand how mechanical strain changes the electrical properties of materials. Although the piezoresistive behavior of poly(3,4‐ethylene‐ dioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been observed, its intrinsic origin is not yet fully understood because there are many extrinsic contributing factors and an experimental platform with which to assess such behavior has not been established. Here
This study starts from the counterintuitive question of how we can render conventional stiff, nonstretchable, and even brittle materials sufficiently conformable to fully wrap curved surfaces, such as spheres, without failure. Here, we extend the geometrical design method of computational origami to wrapping. Our computational wrapping approach provides a robust and reliable method for fabricating conformal devices for arbitrary curved surfaces with a computationally designed nonpolyhedral devel
Design and fabrication of reliable electrodes is one of the most important challenges in flexible devices, which undergo repeated deformation. In conventional approaches, mechanical and electrical properties of continuous metal films degrade gradually because of the fatigue damage. The designed incorporation of nanoholes into Cu electrodes can enhance the reliability. In this study, the electrode shows extremely low electrical resistance change during bending fatigue because the nanoholes suppre
A direct integration scheme for a Li-ion battery on a polymer substrate is successfully implemented. As a proof of concept, the bendable Li-ion battery is fabricated using a nano-hairy Si anode, which exhibits a much longer cycle life and a higher capacity on various C-rates compared to a Si thin film electrode on a pristine PI. In the cyclic bending test, with a bending radius of 16 mm, over 3000 cycles are measured without a voltage drop. As a service to our authors and readers, this journal p
A rugged lithium‐ion battery (LIB) can be realized without any new material development through selective material matching based on localized deformation of a substrate induced by its well‐designed pattern. In particular, an auxetic cut flexible substrate accommodates various complex deformations and adaptive conformations through the hinge joints because the external force is highly localized in the hinges while the segmented motifs remain almost undeformed. The embedded LIB cells in undeforme
