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Porous 3D graphene-based biochar materials with high areal sulfur loading for lithium-sulfur batteries

Abstract

The low electronic conductivity of sulfur and the high solubility of polysulfide seriously hindered the practical application of lithium-sulfur (Li-S) batteries. Therefore, the incorporation of sulfur and carbon-based materials is considered as a suitable solution. Here, porous pomelo biochar/graphene composite (PBG) was prepared via a simple and green method combining hydrothermal carbonization and KOH activation. The obtained material was used as a host to encapsulate sulfur for the cathode of Li-S batteries, and the three-dimensional pore structure with enhanced conductivity is beneficial to the utilization of sulfur and absorption of soluble polysulfide. As a result, the PBG-S composite (63.3 wt% sulfur) delivered an initial discharge capacity of 1053 mAh g−1 at 0.1 C (1 C=1675 mA g−1) and retained 418 mAh g−1 at 3 C, even with a high sulfur loading of 4.0 mg cm−2. In addition, the performance of the composite was further improved by reducing the content of sulfur to a proper ratio in PBG-S composite. The optimized PBG-S composite (48.6 wt% sulfur) exhibits high initial discharge capacity of 1368 mAh g−1 at 0.1 C and retained 638 mAh g−1 and 3 C, and the discharge capacity remained as high as 664 mAh g−1 and 354 mAh g−1 even after 200th and 600th at 1 C, respectively. The results indicated that PBG, with excellent electrochemical properties, is an ideal electrode material for lithium-sulfur batteries, which can also be prepared economically for industrialization.

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Publication details

The article was received on 11 Jul 2018, accepted on 05 Aug 2018 and first published on 10 Aug 2018


Article type: Paper
DOI: 10.1039/C8SE00343B
Citation: Sustainable Energy Fuels, 2018, Accepted Manuscript
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    Porous 3D graphene-based biochar materials with high areal sulfur loading for lithium-sulfur batteries

    D. Liu, Q. Li, J. Hou and H. Zhao, Sustainable Energy Fuels, 2018, Accepted Manuscript , DOI: 10.1039/C8SE00343B

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