Stretchable Lithium-Ion Battery Based on Re-entrant Micro-honeycomb Electrodes and Cross-Linked Gel Electrolyte
- Authors
- Kang, Seulki; Hong, Soo Yeong; Kim, Nayeon; Oh, Jinwoo; Park, Min; Chung, Kyung Yoon; Lee, Sang-Soo; Lee, Jonghwi; Son, Jeong Gon
- Issue Date
- Mar-2020
- Publisher
- American Chemical Society
- Keywords
- butyl rubber encapsulation; graphene-CNT composite; physically cross-linked gel electrolyte; re-entrant micro-honeycomb; stretchable battery
- Citation
- ACS Applied Materials and Interfaces, v.14, no.3, pp 3660 - 3668
- Pages
- 9
- Journal Title
- ACS Applied Materials and Interfaces
- Volume
- 14
- Number
- 3
- Start Page
- 3660
- End Page
- 3668
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/38580
- DOI
- 10.1021/acsnano.0c00187
- ISSN
- 1944-8244
1944-8252
- Abstract
- Stretchable energy storage devices are of great interest because of their potential applications in body-friendly, skin-like, wearable devices. However, stretchable batteries are very challenging to fabricate. The electrodes must have a degree of stretchability because the active materials occupy most of the volume, and the separator and packaging should also be stretchable. Here, an all-component stretchable lithium-ion battery was realized by leveraging the structural stretchability of re-entrant micro-honeycomb graphene-carbon nanotube (CNT)/active material composite electrodes and a physically cross-linked gel electrolyte, without using an inactive elastomeric substrate or matrix. Active materials interconnected via the entangled CNT and graphene sheets provided a mechanically stable porous network framework, and the inwardly protruding framework in the re-entrant honeycomb structure allowed for structural stretching during deformation. The composite network consisting solely of binder-free, highly conductive materials provided superior electron transfer, and vertically aligned microchannels enabled facile ion transport. Additionally, the physically cross-linked gel electrolyte increased the mechanical stability upon deformation of the electrodes and was effective as a stretchable separator. The resulting stretchable battery showed a high areal capacity of 5.05 mAh·cm-2, superior electrochemical performance up to 50% strain under repeated (up to 500) stretch-release cycles, and long-term stability of 95.7% after 100 cycles in air conditions. Copyright © 2020 American Chemical Society.
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