期刊
NANO RESEARCH
卷 8, 期 1, 页码 129-139出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-014-0601-1
关键词
biochars; lithium-sulfur batteries; microporous structure; bamboo carbon-sulfur composites
类别
资金
- ARC from the Australian Research Council
- NSFC-RGC Joint Research Scheme [51361165201]
- NSFC [51125001, 51172005]
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 center dot h/g at a low discharge rate of 160 mA/g and high capacity retention of 550 mA center dot h/g after 150 cycles at a high discharge rate of 800 mA/g with excellent coulombic efficiency (a (c) 3/495%). This suggests that the BC-S nanocomposite could be a promising cathode material for Li-S batteries.
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