Seo, Seung-Deok Yu, Seungho Park, Sangbaek Kim, Dong-Wan 2024-01-19T16:04:38Z 2024-01-19T16:04:38Z 2021-09-02 2020-11 1613-6810 https://pubs.kist.re.kr/handle/201004/117903 Although lithium-sulfur batteries exhibit a fivefold higher energy density than commercial lithium-ion batteries, their volume expansion and insulating nature, and intrinsic polysulfide shuttle have hindered their practical application. An alternative sulfur host is necessary to realize porous, conductive, and polar functions; however, there is a tradeoff among these three critical factors in material design. Here, the authors report a layered porous carbon (LPC) with VO2/V3S4 heterostructures using one-step carbonization-sulfidation of metal-organic framework templates as a sulfur host that meets all the criteria. In situ conversion of V-O ions into V3S4 nuclei in the confined 2D space generated by dynamic formation of the LPC matrix creates {200}-facet-exposed V3S4 nanosheets decorated with tiny VO2 nanoparticles. The VO2/V3S4 @ LPC composite facilitates high sulfur loading (70 wt%), superior energy density (1022 mA h g(-1) at 0.2 C, 100 cycles), and long-term cyclability (665 mA h g(-1) at 1 C, 1000 cycles). The enhanced Li-S chemistry is attributed to the synergistic heterocatalytic behavior of polar VO2 and conductive V3S4 in the soft porous LPC scaffold, which accelerates polysulfide adsorption, conversion, and charge-transfer ability simultaneously. English WILEY-V C H VERLAG GMBH CATALYTIC-OXIDATION POLYSULFIDES CATHODE HETEROSTRUCTURES GRAPHENE SURFACE ADSORPTION PYROLYSIS STABILITY DIFFUSION In Situ Conversion of Metal-Organic Frameworks into VO2-V3S4 Heterocatalyst Embedded Layered Porous Carbon as an "All-in-One" Host for Lithium-Sulfur Batteries Article 10.1002/smll.202004806 1 SMALL, v.16, no.47 SMALL 16 47 scie scopus 000583490200001 2-s2.0-85096534151 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article CATALYTIC-OXIDATION POLYSULFIDES CATHODE HETEROSTRUCTURES GRAPHENE SURFACE ADSORPTION PYROLYSIS STABILITY DIFFUSION heterocatalysts layered porous carbons lithium&#8211 sulfur batteries metal&#8211 organic&#8208 frameworks polar mediators