期刊
ACS ENERGY LETTERS
卷 2, 期 2, 页码 327-333出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.6b00603
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- Samsung future technology foundation [SRFC-TA 1403-04]
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.
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