KLI

Straightforward strategy toward a shape-deformable carbon-free cathode for flexible Li-air batteries in ambient air

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Abstract
Flexible lithium-air batteries (F-LABs) operating under ambient air have attracted much interest as small-sized energy storage devices in routine household settings. Although the instability of the commonly used carbon cathode has prompted the search for a carbon-free cathode, there has not been much success in their development thus far. Here, we report a novel strategic approach to fabricate a large-area carbon-free cathode for shape-deformable F-LABs in ambient air. An electronically conductive and catalytic layer consisting of metallic iridium (Ir) and outermost IrOx was deposited on porous, flexible polyimide nanofibers (PI@IrOx NFs) by radio frequency (RF) sputtering, which was employed as the flexible cathode. Their properties were evaluated under dynamic deformation modes such as bending, folding, twisting, and crumpling. The F-LAB cells with PI@IrOx NFs were stable for 150 cycles using pure O2, and in a dry-air atmosphere (O2/CO2/N2), they remain stable for 300 cycles (=600 h) with low discharge/charge overpotentials by the redox mediator and solid-state electrolyte (L1.3Al0.3Ti1.7(PO4)3, LATP). We elucidate the reaction mechanism at the IrOx surface using ex-situ analyses and density functional theory (DFT) calculations. When applied to pouch-/cable-type F-LAB cells using two different electrolytes (gel-polymer and poly(ethylene oxide)(PEO)/LATP composite electrolytes), the PI@IrOx NFs show superior electrochemical characteristics during repetitive 300 bending cycles for over 60 h in ambient air. Furthermore, the F-LAB cells could be assembled using 3D-printed shape-deformable polyurethane (PU) as the packaging material, demonstrating their practical operation in small devices for the first time.
Author(s)
정지원남종석Konstantin Klyukin윤두영김일두
Issued Date
2021
Type
Article
Keyword
SputteringCarbon-free cathodesShape-deformable electrodesLithium-air batteriesAmbient air
DOI
10.1016/j.nanoen.2021.105821
URI
https://oak.ulsan.ac.kr/handle/2021.oak/8972
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_gale_infotracacademiconefile_A657873047&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Straightforward%20strategy%20toward%20a%20shape-deformable%20carbon-free%20cathode%20for%20flexible%20Li-air%20batteries%20in%20ambient%20air&offset=0&pcAvailability=true
Publisher
NANO ENERGY
Location
네덜란드
Language
영어
ISSN
2211-2855
Citation Volume
83
Citation Number
1
Citation Start Page
105821
Citation End Page
105821
Appears in Collections:
Engineering > Material Engineering
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