TY - JOUR
T1 - 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
AU - Seo, Seung Deok
AU - Yu, Seungho
AU - Park, Sangbaek
AU - Kim, Dong Wan
N1 - Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science and ICT (2019R1A2B5B02070203) and by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2018M3D1A1058744). This work was supported by Korea University Grant.
Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science and ICT (2019R1A2B5B02070203) and by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2018M3D1A1058744). This work was supported by Korea University Grant.
Publisher Copyright:
© 2020 Wiley-VCH GmbH
PY - 2020/11/26
Y1 - 2020/11/26
N2 - 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.
AB - 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.
KW - heterocatalysts
KW - layered porous carbons
KW - lithium–sulfur batteries
KW - metal–organic-frameworks
KW - polar mediators
UR - http://www.scopus.com/inward/record.url?scp=85096534151&partnerID=8YFLogxK
U2 - 10.1002/smll.202004806
DO - 10.1002/smll.202004806
M3 - Article
C2 - 33136344
AN - SCOPUS:85096534151
SN - 1613-6810
VL - 16
JO - Small
JF - Small
IS - 47
M1 - 2004806
ER -