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PIM-1-based carbon-sulfur composites for sodium-sulfur batteries that operate without shuttle effect

Abstract

Room temperature sodium-sulfur (RT Na-S) batteries have distinct advantages over other next generation batteries because of its use of abundant and inexpensive resources with high theoretical capacity of 1166 and 1675 mA h g-1, namely sodium and sulfur. However, problematic side reaction, called shuttle effect, leads to low coulombic efficiency during cycling. Here, we propose a new strategy to fundamentally suppress the shuttle phenomenon by combining two widely used concepts, covalent bonds and physical confinement, through the preparation of PIM-1-based carbon-sulfur composite. This sulfur-carbon material was prepared through one-step heat treatment of the mixture of sulfur and PIM-1. The resulted sulfur-carbon composites have characteristics of both ~0.5-nm-sized ultra-micropores and covalent bonding in a single material, which fundamentally obstruct the dissolution of polysulfide into electrolyte. This strategy led to long cycling stability over 250 cycles, with a capacity of 556 mA h gs-1 and a coulombic efficiency of approximately 100%.

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Supplementary files

Article information


Submitted
04 Oct 2019
Accepted
09 Jan 2020
First published
13 Jan 2020

J. Mater. Chem. A, 2020, Accepted Manuscript
Article type
Communication

PIM-1-based carbon-sulfur composites for sodium-sulfur batteries that operate without shuttle effect

J. W. Jeon, D. Kim, J. Lee, J. Lee, Y. S. Kim, K. T. Lee and B. G. Kim, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/C9TA10939K

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