Article history: N-doped yolk-shell hollow carbon sphere wrapped with reduced graphene oxide (rGO/N-YSHCS) is Received 12 May 2017 designed and fabricated as sulfur host for lithium-sulfur batteries. The shuttle effect of polysulﬁdes can Received in revised form 19 June 2017 be suppressed effectively by the porous yolk-shell structure, graphene layer and N-doping. A good con- Accepted 28 June 2017 ductivity network is provided for electron transportation through the graphene layer coupled with the Available online 1 July 2017 unique yolk-shell carbon matrix. Such unique structure offers the synthesized rGO/N-YSHCS/S electrode −1 with a high reversible capacity (800 mAh g at 0.2 C after 100 cycles) and good high-rate capability Keywords: −1 −1 (636 mAh g at 1 C and 540 mAh g at 2 C). Lithium-sulfur battery © 2017 Elsevier B.V. All rights reserved. Hollow carbon sphere Graphene Nitrogen doping 1. Introduction materials (such as carbon nanotubes [13,14], carbon nanoﬁbers [15,16], graphene [17–19], porous  or hollow [21,22] carbon To satisfy the urgent requirements of energy storage for elec- spheres) have been extensively developed, owing to their special tric vehicles (EVs) and hybrid electric vehicles (HEVs) as well as nanostructures, unique surface chemical properties and high elec- other energy
Applied Surface Science – Elsevier
Published: Jan 1, 2018
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