Improvement of Li-Sulfur Cell Cycling Performance by Use of Fe₁₋ₓS@NC as a Functional Additive for Chemical Confinement of Lithium Polysulfidesopen access
- Authors
- Ahn, Jun Hwan; Veerasubramani, Ganesh Kumar; Lee, Sang-Min; You, Tae-Sun; Kim, Dong-Won
- Issue Date
- Dec-2018
- Publisher
- ELECTROCHEMICAL SOC INC
- Citation
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.166, no.3, pp.A5201 - A5209
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY
- Volume
- 166
- Number
- 3
- Start Page
- A5201
- End Page
- A5209
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/148900
- DOI
- 10.1149/2.0311903jes
- ISSN
- 0013-4651
- 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.
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