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Improvement of Li-Sulfur Cell Cycling Performance by Use of Fe1-xS@NC as a Functional Additive for Chemical Confinement of Lithium Polysulfides

Title
Improvement of Li-Sulfur Cell Cycling Performance by Use of Fe1-xS@NC as a Functional Additive for Chemical Confinement of Lithium Polysulfides
Author
김동원
Keywords
REDUCED GRAPHENE OXIDE; CONDUCTING POLYMER; ANODE MATERIAL; S BATTERIES; CATHODE; ELECTROCHEMISTRY; STABILITY; CHEMISTRY
Issue Date
2018-12
Publisher
ELECTROCHEMICAL SOC INC
Citation
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v. 166, no. 3, page. A5201-A5209
Abstract
Lithium-sulfur cells using sulfur as an active cathode material offer high energy density and low-cost. However, dissolution and migration of lithium polysulfides (the 'shuttle effect') remain key obstacles for the practical development of lithium-sulfur cells. Here, we demonstrate that Fe1-xS (pyrrhotite) coated by N-doped carbon (Fe1-xS@NC) with high affinity for polysulfides and high electronic conductivity can be used as a functional additive to trap lithium polysulfides and reutilize reaction intermediates in the sulfur cathode during cycling. The addition of Fe1-xS@NC into the sulfur cathode results in the enhancement of cycling performance of the lithium-sulfur cell in terms of initial discharge capacity, capacity retention and rate capability. This superior cycling performance can be attributed to strong chemical interactions between electrically conductive Fe1-xS@NC particles and lithium polysulfides, which suppress the dissolution of lithium polysulfides and enhance the utilization of active sulfur during repeated cycling. (c) The Author(s) 2018. Published by ECS.
URI
http://jes.ecsdl.org/content/166/3/A5201http://repository.hanyang.ac.kr/handle/20.500.11754/121001
ISSN
0013-4651; 1945-7111
DOI
10.1149/2.0311903jes
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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