Extremely Versatile Deformability beyond Materiality: A New Material Platform through Simple Cutting for Rugged Batteries. Issue 7 (12th March 2019)

• Record Type: Journal Article
• Authors: Kim, Kee‐Bum; Lee, Young‐Joo; Costa, Avelino; Lee, Yu‐Ki; Jang, Tae‐Sik; Lee, Myoung‐Gyu; Joo, Young‐Chang; Oh, Kyu Hwan; Song, Juha; Choi, In‐Suk
• Is Part Of: Advanced engineering materials. Volume 21:Issue 7(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-03-12
• Subjects: architected materials -- hierarchical cuts -- strain isolation -- stretchable batteries; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201900206
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : 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 undeformed regions of the auxetic cut silicon rubber sheet do not undergo large deformation, maintaining their battery performance regardless of loading conditions via the pattern‐associated deformation mechanism. The hierarchy and number of segmentations are the key parameters of the deformation mechanism for auxetic cut shape‐reconfigurable battery systems. The numerically and experimentally proven strategy that utilizes strain gradients induced by a patterned substrate as a design guideline for material matching can lead to various wearable and conformable designs without sacrificing the functionality and durability of electronic devices. Abstract : Lithium‐ion batteries accommodating versatile, extreme deformations can be realized by a geometrically well‐designed substrate. Auxetic cut, which is a design of self‐similar hierarchical cut consisting of segmented motifs connected with hinges, achieves strain isolation in a confined area during deformation. Without sacrificing the functionality, the batteries integrated on auxetic cut platforms can display exceptional deformability.