期刊
SOFT ROBOTICS
卷 9, 期 3, 页码 486-496出版社
MARY ANN LIEBERT, INC
DOI: 10.1089/soro.2020.0175
关键词
soft robotics; scale structure; shape-morphing; stretchable Li-ion battery; stretchable electronics
类别
资金
- Korea Institute of Machinery & Materials (KIMM) [NK230C]
- Ministry of Trade, Industry and Energy [20007014]
- Center for Advanced MetaMaterials (CAMM) - Ministry of Science, ICT, and Future Planning [2014063701, 2014063700]
- National Research Council of Science & Technology (NST), Republic of Korea [NK230C] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A novel structure inspired by nature, resembling snake scales, has been developed for constructing shape-morphing batteries for soft robots. This structure exhibits multi-axial deformability and a zero Poisson's ratio, maintaining high performance under dynamic deformations, making it suitable for soft robot systems.
Geometrically multifunctional structures inspired by nature can address the challenges in the development of soft robotics. A bioinspired structure based on origami and kirigami can significantly enhance the stretchability and reliability of soft robots. This study proposes a novel structure with individual, overlapping units, similar to snake scales that can be used to construct shape-morphing batteries for untethered soft robots. The structure is created by folding well-defined, two-dimensional patterns with cutouts. The folding lines mimic the hinge structure of snakeskin, enabling stable deformations without mechanical damage to rigid cells. The structure realizes multi-axial deformability and a zero Poisson's ratio without off-axis distortion to the loading axis. Moreover, to maximize areal density, the optimal cell shape is designed as a hexagon. The structure is applied to a stretchable Li-ion battery, constructed to form an arrangement of electrically interconnected, hexagonal pouch cells. In situ electrochemical characterization and numerical simulation confirm that the shape-morphing scale battery maintains its performance under dynamic deformation with a 90% stretching ratio and 10-mm-radius bending curve, guaranteeing a long-lasting charging/discharging cycle life during cyclic bending and stretching (exceeding 36,000 cycles). Finally, the shape-morphing energy storage device is applied to movable robots, mimicking crawling and slithering, to demonstrate excellent conformability and deformability.
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