Royal Society of Chemistry, Journal of Materials Chemistry A: materials for energy and sustainability, 34(2), p. 13854-13858, 2014
DOI: 10.1039/c4ta02717e
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Bismuth sulfide (Bi2S3) is a promising Li-storage material due to the high gravimetric and volumetric capacities. However, this intrinsic merit has often been compromised by the poor cycle and rate capability due to lacking of structural integrity upon Li insertion/extraction process. Here, we engineer a branch-structured bismuth sulfide-carbon nanotube (CNT) hybrid by growing Bi2S3 nanorods onto CNTs to mitigate this issue. The hierarchical Bi2S3-CNT hybrids possess high surface areas, rich porosity for electrolyte infiltration, and direct electron transport pathways, and can be employed as efficient electrode material for Li storage. This electrochemical results show that the Bi2S3-CNT hybrid exhibits a high reversible capacity (671 mAh g–1 at 120 mA g–1), stable cycling retention (534 mAh g–1 after 90 cycles), and remarkable rate capability (399 mAh g–1 at 3000 mA g–1), notably outperforming other reported Bi2S3 materials. Such superb Li storage capabilities suggest that the Bi2S3-CNT branches could be potential electrodes for rechargeable batteries.