Journal
ELECTROCHIMICA ACTA
Volume 209, Issue -, Pages 171-182Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.05.069
Keywords
Coir pith carbon; Bio-waste derived carbon; Microporous carbon; Bio-scaffold for sulfur cathode; Lithium sulfur batteries
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Funding
- Department of Science and Technology (DST), India [IF120555]
- CSIR through MULTIFUN project [CSC-0101]
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Coir pith, a sustainable and renewable bio-waste material was activated and the porous carbon thus obtained has been explored for the first time as a scaffold for sulfur cathode. Unlike the reported bio-scaffolds, this study demonstrates the possibility of accommodating about 70 wt.% sulfur within the pores of bio-carbon, without leaving any bulk sulfur on the carbon surface. The naturally available lignin and cellulose content of coir pith offers advantages of porogen triggered pore volume of 0.86 cm(3)/g and the Coir pith derived carbon (CPC) is bestowed with an appreciable surface area of 1952 m(2)/g. CPC provides improved electrical conductivity and better confinement of sulfur against dissolution of polysulfides and the required space to admit volume exhalation of the active material, especially when 50 wt.% sulfur is loaded to form CPC/S-50 composite. As a result, CPC/S-50 cathode tolerates 1C rate condition and exhibits a progressive capacity of 695 mAh/g with 95% Coulombic efficiency. The study recommends CPC as yet another potential bio-scaffold for the effective utilisation of sulfur in Li-S system. (C) 2016 Elsevier Ltd. All rights reserved.
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