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

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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.
Publisher
AMER CHEMICAL SOC
Issue Date
2017-02
Language
English
Article Type
Article
Keywords

LI-S BATTERIES; LONG CYCLE-LIFE; MESOPOROUS CARBON; LIQUID ELECTROLYTE; CATHODE; COMPOSITES; MECHANISM; GRAPHENE; SHUTTLE; REDOX

Citation

ACS ENERGY LETTERS, v.2, no.2, pp.327 - 333

ISSN
2380-8195
DOI
10.1021/acsenergylett.6b00603
URI
http://hdl.handle.net/10203/222715
Appears in Collection
EEW-Journal Papers(저널논문)
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