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MOF-derived NiO–NiCo2O4@PPy hollow polyhedron as a sulfur immobilizer for lithium–sulfur batteries

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Abstract

The lithium–sulfur battery has been regarded as a highly competitive candidate for the efficient energy storage devices owing to its high theoretical capacity (1675 mA h g−1) and energy density (2600 W h kg−1). Herein, we have designed and synthesized a unique metal–organic framework (MOF)-derived NiO–NiCo2O4@PPy hollow polyhedral structure material as an efficient sulfur immobilizer for lithium–sulfur batteries (LSBs). The NiO–NiCo2O4@PPy structure effectively alleviates volume expansion, increases electronic conductivity, and enhances the binding effect on lithium polysulfides by chemical fixation. The S/NiO–NiCo2O4@PPy composite displays a high initial discharge capacity of 963 mA h g−1 with a high initial coulombic efficiency of 95.2% at a low current density of 0.2C. In addition, this sample exhibits good cycling performance at a high current density of 1C. All the results show that this design strategy has great potential to promote the design of MOF-derived materials for LSBs.

Graphical abstract: MOF-derived NiO–NiCo2O4@PPy hollow polyhedron as a sulfur immobilizer for lithium–sulfur batteries

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Publication details

The article was received on 05 Sep 2019, accepted on 20 Oct 2019 and first published on 21 Oct 2019


Article type: Paper
DOI: 10.1039/C9NJ04581C
New J. Chem., 2019, Advance Article

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    MOF-derived NiO–NiCo2O4@PPy hollow polyhedron as a sulfur immobilizer for lithium–sulfur batteries

    F. Xu, B. Jin, H. Li, W. Ju, Z. Wen and Q. Jiang, New J. Chem., 2019, Advance Article , DOI: 10.1039/C9NJ04581C

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