Journal
ELECTROCHIMICA ACTA
Volume 383, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.138371
Keywords
Nitrogen doping; Lithium-sulfur batteries; Lithium polysulfides; High sulfur loading
Categories
Funding
- Natural Science Foundation of Guangdong Province [2019A1515011727]
- Scientific Research Project of Education Department of Hubei Province [D20201103]
- Open Fund of the Guangdong Provincial Key Laboratory of Advance Energy Storage Materials and the Fundamental Research
- Open Fund of Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, Guangdong University of Petrochemical Technology [2018B030322017]
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A three-dimensional sulfur carrier, Co-NCNT, was designed to enhance the conversion efficiency of sulfur polysulfides and promote the nucleation of Li2S, leading to excellent long cycle stability and rate performance of Li-S batteries.
The effective inhibition of lithium polysulfides (LiPSs) and promotion of their conversion in the redox processes is indispensable to achieve the long cycle stability and excellent rate performance of lithium-sulfur (Li-S) batteries. Especially, the generally slow electrocatalytic sulfur redox kinetics and large interfacial Li2S nucleation energy barriers have hindered the widespread application of Li-S batteries. Herein, a robust three-dimensional sulfur carrier (denoted as Co-NCNT) is well-constructed using the potassium citrate derived porous carbon sheets as substrate and the catalytic growth nitrogen-doped porous carbon nanotubes as vertical scaffolds. Such a rationally designed structure guarantees efficient electron transfer pathways and ions diffusion channels. More importantly, it is conducive to the adsorption/catalytic conversion of intermediate lithium polysulfides and the nucleation of Li2S. Due to these merits, the S@Co-NCNT cathode achieves an initial discharge capacity up to 1072.7 mAh g(-1) at 1.0 C, and it can retain a high capacity of 482.9 mAh g(-1) with a capacity attenuation rate of only 0.045% per cycle after 1000 cycles. Upon a high sulfur loading of 5.87 mg cm(-2), the S@Co-NCNT electrode can still reach an initial capacity of 739.5 mAh g(-1) at 0.3 C. Particular emphasis is that our work broadens the way to prepare well-designed carbonaceous materials sulfur host for long-life Li-S batteries. (C) 2021 Elsevier Ltd. All rights reserved.
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