Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 47, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202212680
Keywords
Li-S Battery; Lithium Polysulfide; Pore Confinement; Porous Carbon; Single-Atom Catalyst
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Funding
- Ministry of Education of Singapore through the Academic Research Fund (AcRF) Tier-2 grant [MOE2019-T2-2-049]
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In this study, a NH4Cl-assisted pyrolysis strategy is developed to fabricate highly mesoporous N-rich carbon (Ni-NC(p)) as a sulfur host for lithium-sulfur batteries. The Ni-NC(p) material exhibits favorable electron/ion transfer, high sulfur loading, and effective confinement of lithium polysulfides, resulting in improved battery performance including specific capacity, rate capability, and cycling stability.
Physicochemical confinement and catalytic conversion of lithium polysulfides (LiPSs) are crucial to suppress the shuttle effect and enhance the redox kinetics of lithium-sulfur (Li-S) batteries. In this study, a NH4Cl-assisted pyrolysis strategy is developed to fabricate highly mesoporous N-rich carbon (designed as NC(p)) featuring thin outer shells and porous inner networks, on which single-Ni atoms are anchored to form an excellent sulfur host (designed as Ni-NC(p)) for Li-S batteries. During pyrolysis, the pyrolytic HCl from confined NH4Cl within ZIF-8 will in situ etch ZIF-8 to produce rich mesoporous in the carbonized product NC(p). The mesoporous Ni-NC(p) enables favorable electron/ion transfer, high sulfur loading, and effective confinement of LiPSs, while the catalytic effect of single-Ni species enhances the redox kinetics of LiPSs. As a result, the sulfur cathode based on the Ni-NC(p) host delivers obviously improved Li-S battery performance with high specific capacity, good rate capability, and cycling stability.
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