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Lee, Sang-Young
Energy Soft-Materials Lab (ESML)
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  • Soft Materials for Energy Storage/ Conversion Systems

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Nanomat Li-S batteries based on all-fibrous cathode/separator assemblies and reinforced Li metal anodes: towards ultrahigh energy density and flexibility

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Title
Nanomat Li-S batteries based on all-fibrous cathode/separator assemblies and reinforced Li metal anodes: towards ultrahigh energy density and flexibility
Author
Kim, Jung-HwanLee, Yong-HyeokCho, Sung-JuGwon, Jae-GyoungCho, Hye-JungJang, MinchulLee, Sun-YoungLee, Sang-Young
Issue Date
2019-01
Publisher
ROYAL SOC CHEMISTRY
Citation
ENERGY & ENVIRONMENTAL SCIENCE, v.12, no.1, pp.177 - 186
Abstract
Lithium-sulfur (Li-S) batteries have attracted considerable attention as a promising alternative to current state-of-the-art lithium-ion batteries (LIBs), however, their practical use remains elusive, which becomes more serious upon application to flexible/wearable electronics. Here, we demonstrate a new class of nanomat Li-S batteries based on all-fibrous cathode-separator assemblies and conductive nonwoven-reinforced Li metal anodes as an unprecedented strategy toward ultrahigh energy density and mechanical flexibility. Sulfur cathodes, which are fibrous mixtures of sulfur-deposited multi-walled carbon nanotubes and single-walled carbon nanotubes, are monolithically integrated with bi-layered (pristine cellulose nanofiber (CNF)-anionic CNF) paper separators, resulting in metallic foil current collector-free, all-fibrous cathode-separator assemblies. The cathode-separator assemblies, driven by their all-fibrous structure (contributing to three-dimensional bi-continuous electron/ion conduction pathways) and anionic CNFs (suppressing the shuttle effect via electrostatic repulsion), improve redox kinetics, cyclability and flexibility. Nickel-/copper-plated conductive poly(ethylene terephthalate) nonwovens are physically embedded into Li foils to fabricate reinforced Li metal anodes with dimensional/electrochemical superiority. Driven by the structural uniqueness and chemical functionalities, the nanomat Li-S cells provide exceptional improvements in electrochemical performance (the (cell-based) gravimetric/volumetric energy density = 457 W h kgcell−1/565 W h Lcell−1 and the cycling performance (over 500 cycles) under 110% capacity excess of the Li metal anode) and mechanical deformability (they even can be crumpled).
URI
https://scholarworks.unist.ac.kr/handle/201301/25113
URL
https://pubs.rsc.org/en/content/articlelanding/2018/ee/c8ee01879k#!divAbstract
DOI
10.1039/C8EE01879K
ISSN
1754-5692
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