Jeong, Tae-Gyung Choi, Dong Shin Song, Hannah Choi, Jihwan Park, Shin-Ae Oh, Si Hyoung Kim, Heejin Jung, Yousung Kim, Yong-Tae 2024-01-20T02:30:40Z 2024-01-20T02:30:40Z 2021-09-01 2017-02 2380-8195 https://pubs.kist.re.kr/handle/201004/123156 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. English AMER CHEMICAL SOC Heterogeneous Catalysis for Lithium-Sulfur Batteries: Enhanced Rate Performance by Promoting Polysulfide Fragmentations Article 10.1021/acsenergylett.6b00603 1 ACS ENERGY LETTERS, v.2, no.2, pp.327 - 333 ACS ENERGY LETTERS 2 2 327 333 N scie scopus 000394080000007 2-s2.0-85022088528 Chemistry, Physical Electrochemistry Energy & Fuels Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Science & Technology - Other Topics Materials Science Article LI-S BATTERIES MESOPOROUS CARBON LIQUID ELECTROLYTE CATHODE COMPOSITES MECHANISM SHUTTLE REDOX DISCHARGE NANOPARTICLES heterogeneous catalyst Li-S batteries polysulfide TiS2