Choi, Jihwan Jeong, Tae-Gyung Cho, Byung Won Jung, Yousung Oh, Si Hyoung Kim, Yong-Tae 2024-01-19T23:01:47Z 2024-01-19T23:01:47Z 2021-09-03 2018-04-12 1932-7447 https://pubs.kist.re.kr/handle/201004/121479 The sluggish disproportionation of short-chain lithium polysulfides, Li2Sx is known to be one of the major causes to limit the rate capability of lithium sulfur batteries. Herein, we report that tungsten carbide not only affords strong sulfiphilic surface moieties but also provides an efficient catalysis to enhance the polysulfide fragmentation, leading to a drastic improvement in the electrode kinetics. We show that tungsten carbide acts as a superb anchoring material for the long-chain polysulfide and also promotes the dissociation of short-chain polysulfide during the electroreduction process. This leads to a high-rate performance of the composite cathode loaded with tungsten carbide, delivering a markedly enhanced discharge capacity of 780 mA h g(-1) at a high current rate of 5 C, when it is applied with a combination of a carbon-coated separator for the polysulfide confinement. Hence, this work presents a new strategic approach for a high-power lithium-sulfur battery. English American Chemical Society LITHIUM-SULFUR BATTERIES LONG CYCLE LIFE MESOPOROUS CARBON CATHODE MATERIALS REDOX REACTIONS PERFORMANCE COMPOSITES CHALLENGES INTERLAYER SEPARATOR Tungsten Carbide as a Highly Efficient Catalyst for Polysulfide Fragmentations in Li-S Batteries Article 10.1021/acs.jpcc.8b02096 1 The Journal of Physical Chemistry C, v.122, no.14, pp.7664 - 7669 The Journal of Physical Chemistry C 122 14 7664 7669 scie scopus 000430255900012 2-s2.0-85045415790 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article LITHIUM-SULFUR BATTERIES LONG CYCLE LIFE MESOPOROUS CARBON CATHODE MATERIALS REDOX REACTIONS PERFORMANCE COMPOSITES CHALLENGES INTERLAYER SEPARATOR lithium sulfur catalyst tungsten carbide polysulfide