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Design considerations for lithium-sulfur batteries: mass transport of lithium polysulfides

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Title
Design considerations for lithium-sulfur batteries: mass transport of lithium polysulfides
Author(s)
Seong-Jun Kim; Yunseo Jeoun; Jungjin Park; Seung-Ho Yu; Yung-Eun Sung
Subject
LI-S BATTERIES, ; CARBON NANOTUBES, ; ION BATTERIES, ; CATHODE, ; NANOSHEETS, ; ELECTRODE
Publication Date
2020-07
Journal
NANOSCALE, v.12, no.28, pp.15466 - 15472
Publisher
ROYAL SOC CHEMISTRY
Abstract
© The Royal Society of Chemistry 2020. Irreversible loss of soluble lithium polysulfides (LiPSs) is a major obstacle deteriorating the performance of lithium-sulfur batteries. Multiple innovative approaches have recently been developed to resolve these LiPS issues. Melt-diffusion of sulfur into porous carbon is a representative solution for preventing the diffusion out of LiPSs, which aims to coordinate the sulfur on the electrochemically active site, accordingly. However, it has been overlooked that the mass transport motion of LiPSs has a crucial role in achieving high-performance. In this paper, we highlight the importance of the mass transport of soluble sulfur in the cathode structure by introducing various starting materials, i.e., solid sulfur using melt-diffusion and a catholyte, using 3-dimensional ordered macroporous carbon. The capacity of the sulfur cathode using melt-diffusion is well conserved in carbon with small pores because LiPSs are slowly diffused away, however, the catholyte derived sulfur cathode shows superior performance in carbon with large pores due to their rapid mass transport. The comparison with the four different combinations that control the pore size and mass transport reveals that proper selection of the initial state of starting materials using porous carbons demonstrates the optimal cell performance
URI
https://pr.ibs.re.kr/handle/8788114/7769
DOI
10.1039/d0nr02936j
ISSN
2040-3364
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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