Heterogeneous Catalysis for Lithium-Sulfur Batteries: Enhanced Rate Performance by Promoting Polysulfide Fragmentations

Title
Heterogeneous Catalysis for Lithium-Sulfur Batteries: Enhanced Rate Performance by Promoting Polysulfide Fragmentations
Authors
오시형Tae-Gyung JeongDong Shin ChoiHannah SongJihwan ChoiShin-Ae ParkYousung JungYong-Tae KimHeejin Kim
Keywords
heterogeneous; catalyst; Li-S batteries; polysulfide; TiS2
Issue Date
2017-02
Publisher
ACS energy letters
Citation
VOL 2, NO 2-333
Abstract
A spatial confiment of polysulfides using the metal compound additives having polar surfaces has been considered to be a promising approach to address the insufficient rate capability and cyclability of lithium-sulfur batteries. Herein, we report a more effective approach outperforming this conventional one: a heterogeneous catalysis to promote polysulfide fragmentations. It was revealed using combined computational and experimental approaches that an ultrastrong adsorption of elemental sulfur on TiN surfaces resulted in a spontaenous fragmentation into shorter chains of polysulfides. This heterogeneous catalysis reaction improved the sluggish kinetics of polysulfide reduction because of the chemical disproportionation at the second plateau. A markedly enhanced rate capability was finally obtained, exhibiting a discharge capacity of 700 mAh g(-1) at a scan rate of 5C.
URI
http://pubs.kist.re.kr/handle/201004/66703
ISSN
2380-8195
Appears in Collections:
KIST Publication > Article
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