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A sulfur–FePO4–C nanocomposite cathode for stable and anti-self-discharge lithium–sulfur batteries

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Abstract

Lithium–sulfur batteries are regarded as promising candidates for energy storage devices owing to their high theoretical energy density. However, severe self-discharge due to the dissolution and shuttle effect of polysulfides hinders the practical application of Li–S batteries. In this work, we present a strategy to entrap sulfur in a mesoporous FePO4/carbon nanocomposite that relies on a chemical process, in which FePO4 bonds with sulfur to form S–O chemical bonds for high performance Li–S batteries. The prepared S/FePO4/C nanocomposite exhibits excellent cycling performance. It delivers an initial discharge capacity of 953.8 mA h g−1 and a discharge capacity of 550.8 mA h g−1 can be reserved after successive cycling for 500 cycles with a capacity decay rate of 0.05% per cycle at 0.5C. Also, the S/FePO4/C electrode exhibits extremely low self-discharge behavior. The cell voltage is stabilized at a high value of approximately 2.9 V after 7 days' rest with S/FePO4/C as the cathode. Even after 30 days' rest, the potential is still maintained at about 2.7 V, demonstrating an extremely low rate of self-discharge. In addition, both the areal capacity and the volumetric capacity of the S/FePO4/C electrode are superior to those of the S/carbon electrode, indicating its promising application in practical Li–S batteries.

Graphical abstract: A sulfur–FePO4–C nanocomposite cathode for stable and anti-self-discharge lithium–sulfur batteries

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Publication details

The article was received on 05 Jun 2017, accepted on 28 Jul 2017 and first published on 28 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA04852A
Citation: J. Mater. Chem. A, 2017, Advance Article
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    A sulfur–FePO4–C nanocomposite cathode for stable and anti-self-discharge lithium–sulfur batteries

    Y. Pang, Y. Wen, W. Li, Y. Sun, T. Zhu, Y. Wang and Y. Xia, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA04852A

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