Research Article

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2015, 8(1): 129–139

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https://doi.org/10.1007/s12274-014-0601-1

Microporous bamboo biochar for lithium−sulfur batteries

Xingxing Gu1, Yazhou Wang1, Chao Lai1, Jingxia Qiu1, Sheng Li1, Yanglong Hou2 (*), Wayde Martens3, Nasir Mahmood2, and Shanqing Zhang1 (*)

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1 Centre for Clean Environment and Energy, Environmental Futures Research Institute, Griffith School of Environment, Gold Coast Campus, Griffith University, QLD 4222, Australia
2 Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
3 Science and Engineering Faculty, Queensland University of Technology QLD 4001, Australia

Keywords: biochars, lithium-sulfur batteries, microporous structure, bamboo carbon–sulfur composites
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  • Abstract
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Being simple, inexpensive, scalable and environmentally friendly, microporous biomass biochars have been attracting enthusiastic attention for application in lithium-sulfur (Li–S) batteries. Herein, porous bamboo biochar is activated via a KOH/annealing process that creates a microporous structure, boosts surface area and enhances electronic conductivity. The treated sample is used to encapsulate sulfur to prepare a microporous bamboo carbon–sulfur (BC-S) nanocomposite for use as the cathode for Li–S batteries for the first time. The BC-S nanocomposite with 50 wt.% sulfur content delivers a high initial capacity of 1,295 mA·h/g at a low discharge rate of 160 mA/g and high capacity retention of 550 mA·h/g after 150 cycles at a high discharge rate of 800 mA/g with excellent coulombic efficiency (≥95%). This suggests that the BC-S nanocomposite could be a promising cathode material for Li–S batteries.
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Microporous bamboo biochar for lithium−sulfur batteries. Nano Res. 2015, 8(1): 129–139 https://doi.org/10.1007/s12274-014-0601-1

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