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An efficient polysulfide trapper of an nitrogen and nickel-decorating amylum scaffold-coated separator for ultrahigh performance in lithium–sulfur batteries

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Abstract

In recent years, lithium–sulfur batteries (LSBs) have attracted increasing attention due to their extraordinary theoretical capacity, high energy density, eco-friendliness and the low cost of sulfur. However, increasing the sulfur loading and restraining the polysulfide shuttle effect are the primary issues to be solved. Herein, a novel N, Ni-decorating amylum scaffold was fabricated by carbonizing amylum with urea and NiCl·6H2O (AC/Ni/N) at 1000 °C under Ar atmosphere. The AC/Ni/N scaffold was used to modify the separator as an effective polysulfide trapper for LSBs. This AC/Ni/N-modified separator not only exhibits a high polysulfide confinement, but provides abundant conductive pathways to permit the fast diffusion of the Li+ ions and electrons. Importantly, the synergistic catalysis of the Ni nanoparticles and N atoms plays a key role in improving the reaction kinetics of LSBs. Consequently, the LSBs with AC/Ni/N-modified separators delivered a superior rate performance and ultra-long cycling life with a very low decay rate of 0.043% per cycle at 4C. Moreover, the cathode, with a high sulfur loading at 7 mg cm−2 and low electrolyte environment at 7.8 μL mg−1, delivered a high discharge capacity of 714 mA h g−1 after 100 cycles.

Graphical abstract: An efficient polysulfide trapper of an nitrogen and nickel-decorating amylum scaffold-coated separator for ultrahigh performance in lithium–sulfur batteries

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Supplementary files

Article information


Submitted
21 Nov 2019
Accepted
01 Dec 2019
First published
02 Dec 2019

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

An efficient polysulfide trapper of an nitrogen and nickel-decorating amylum scaffold-coated separator for ultrahigh performance in lithium–sulfur batteries

Y. Zuo, M. Zhao, P. Ren, W. Su, J. Zhou, Y. Chen, Y. Tang and Y. Chen, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA12774G

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