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Stretchable Lithium-Ion Battery Based on Re-entrant Micro-honeycomb Electrodes and Cross-Linked Gel Electrolyte
journal contribution
posted on 2020-03-05, 17:42 authored by Seulki Kang, Soo Yeong Hong, Nayeon Kim, Jinwoo Oh, Min Park, Kyung Yoon Chung, Sang-Soo Lee, Jonghwi Lee, Jeong Gon SonStretchable
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.
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stabilitydeformationStretchable Lithium-Ion Batterywearable devicesareal capacitystretchable separatorelectrodeall-component stretchable lithium-ion batteryelectron transferstretchable batterieselectrochemical performancestretchabilityconductive materialsCross-Linked Gel Electrolyte Stretchable energy storage devicesion transportelastomeric substrate100 cyclescross-linked gel electrolytegraphene sheetsair conditionsActive materialsCNTstretchable batteryre-entrant honeycomb structurenetwork frameworkRe-entrant Micro-honeycomb Electrodes
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