Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 704, Issue -, Pages 1-6Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.02.052
Keywords
Li-S batteries; Cathode; Composite; Spirulina; Carbon
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Funding
- Zhejiang Province Public Welfare Projects [2016C31108]
- National Natural Science Foundation of China [NSFC 61376005, 51672063]
- Zhejiang Top Priority Discipline of Textile Science and Engineering [2015KF10]
- Natural Science Foundation of Zhejiang Province [LY16E020009]
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Spirulina was used for the first time as a raw nitrogen-doped porous carbon source to synthesize carbon/ sulphur (carbon/S) composite cathodes for lithium-sulphur batteries. The composites consisting of sulphur and spirulina-derived carbon with micro- and meso-pores showed an obvious carbon encapsulating sulphur structure. The carbon/S cathodes exhibited much better electrochemical performance than pristine sulphur, delivering an initial discharge capacity of 662 mAh g-(1) with nearly 60% capacity retention after 100 cycles at 1 C current density (1670 mA g(-1)). The improved electrochemical stability of the composites can be ascribed to the synergistic effects between the encapsulation of sulphur by spirulina-derived carbon and adsorption of polysulfides on N doped carbon lattice. These effects successfully prevented or retarded the shuttle effect of sulphur cathodes. (C) 2017 Elsevier B.V. All rights reserved.
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