3D vertically aligned and interconnected porous carbon nanosheets as sulfur immobilizers for high performance lithium-sulfur batteries

Rehman, S, Gu, X, Khan, K, Mahmood, N, Yang, W, Huang, X, Guo, S and Hou, Y 2016, '3D vertically aligned and interconnected porous carbon nanosheets as sulfur immobilizers for high performance lithium-sulfur batteries', Advanced Energy Materials, vol. 6, no. 12, pp. 1-8.


Document type: Journal Article
Collection: Journal Articles

Title 3D vertically aligned and interconnected porous carbon nanosheets as sulfur immobilizers for high performance lithium-sulfur batteries
Author(s) Rehman, S
Gu, X
Khan, K
Mahmood, N
Yang, W
Huang, X
Guo, S
Hou, Y
Year 2016
Journal name Advanced Energy Materials
Volume number 6
Issue number 12
Start page 1
End page 8
Total pages 8
Publisher Wiley-VCH Verlag
Abstract A unique nanostructure of 3D and vertically aligned and interconnected porous carbon nanosheets (3D-VCNs) is demonstrated by a simple carbonization of agar. The key feature of 3D-VCNs is that they possess numerous 3D channels with macrovoids and mesopores, leading to high surface area of 1750 m 2 g -1 , which play an important role in loading large amount of sulfur, while vertically aligned microporous carbon nanosheets act as the multilayered physical barrier against polysulfides anions and prevent their dissolution in the electrolyte due to strong adsorption during cycling process. As a result, the 3D hybrid (3D-S-VCNs) infiltered with 68.3 wt% sulfur exhibits a high and stable reversible capacity of 844 mAh g -1 at the current density of 837 mA g -1 with excellent Coulombic efficiency ≈100%, capacity retention of ≈80.3% over 300 cycles, and good rate ability (the reversible capacity of 738 mAh g -1 at the high current density of 3340 mA g -1 ). The present work highlights the vital role of the introduction of 3D carbon nanosheets with macrovoids and mesopores in enhancing the performance of LSBs.
Subject Synthesis of Materials
Functional Materials
Nanomaterials
Keyword(s) 3D nanostructured cathodes
carbonization process
Li-S batteries
micro-mesoporous carbon
nanosheets
DOI - identifier 10.1002/aenm.201502518
Copyright notice © 2016 Wiley-VCH Verlag
ISSN 1614-6832
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