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Published in: Journal of Nanoparticle Research 1/2018

01-01-2018 | Research Paper

DTT-doped MWCNT coating for checking shuttle effect of lithium-sulfur battery

Authors: Sun Xiaogang, Wang Jie, Li Xu, Chen Wei

Published in: Journal of Nanoparticle Research | Issue 1/2018

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Abstract

In order to improve the rate and reversible capacity of lithium-sulfur (Li-S) battery, a reagent of dithiothreitol (DTT) was utilized to check the dissolution and shuttle of long-chain lithium polysulfides (LiPSs) by cutting the disulfide bond (–S–S– bonds) in them. The slurry of DTT-doped multi-walled carbon nanotubes (MWCNTs) was coated on the surface of sulfur cathode as a shield to slice the long-chain LiPSs to short-chain ones for checking the dissolution and migration of LiPSs to lithium anode. The morphology and structure of the electrodes were observed by scanning electron microscopy (SEM). The electrochemical performance was tested by galvanostatic charge-discharge, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The initial discharge capacity of S-DTT- carbon nanotube paper (CNTP) electrode reached 1670 and 949 mAh/g at 0.05 and 2 C respectively with a coulombic efficiency of over 99%. The electrode maintained a reversible specific capacity of 949 mAh/g after 45 cycles at 2 C. This suggested that the DTT-doped MWCNT coating can restrain shuttle effect and improve the rate and capacity of Li-S battery. The S-DTT-CNTP electrode not only accommodates the volume expansion but also provides stable electronics and ions channels.

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Metadata
Title
DTT-doped MWCNT coating for checking shuttle effect of lithium-sulfur battery
Authors
Sun Xiaogang
Wang Jie
Li Xu
Chen Wei
Publication date
01-01-2018
Publisher
Springer Netherlands
Published in
Journal of Nanoparticle Research / Issue 1/2018
Print ISSN: 1388-0764
Electronic ISSN: 1572-896X
DOI
https://doi.org/10.1007/s11051-017-4122-1

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