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Stable cycling of Li-S batteries by simultaneously suppressing Li dendrites growth and polysulfides shuttle enabled by a bioinspired separator

Abstract

Lithium-sulfur (Li-S) batteries are very promising candidates for next-generation high-energy-storage devices. However, the uncontrollable Li dendrites growth and notorious polysulfides shuttle severely hinder their real world applications. Here, we report a bioinspired separator to address these issues simultaneously. The separator is prepared by successive deposition of silicone nanofilaments and polydopamine on the Celgard@2400 separator. The separator has a 3D crosslinked network with abundant O, N-containing groups and Si-O groups, which can redistribute the Li+ in electrolyte at the molecular level to realize fast Li+ diffusion and uniform Li+ flux. Thus, long-term stable Li stripping/plating is achieved even at a high current density of 10 mA cm−2. Meanwhile, these polar groups can act as lithiophilic sites to effectively suppress polysulfides shuttle by forming Li-O and Li-N bonds with polysulfides. Consequently, the separator enables stable cycling of the Li-S battery with high S loading CNTs/S cathode (4.3 mg cm−2). The battery features slow capacity decay (0.018% per cycle over 1000 cycles at 1.0 C), high specific energy density (569.2 W h kg−1) and high average Coulombic efficiency (98.71%). This study demonstrates the potential of advanced separators for high-performance Li-S batteries by realizing stable electrochemical interfaces at anode and cathode.

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Supplementary files

Article information


Submitted
25 Nov 2019
Accepted
15 Jan 2020
First published
15 Jan 2020

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

Stable cycling of Li-S batteries by simultaneously suppressing Li dendrites growth and polysulfides shuttle enabled by a bioinspired separator

Y. Yang, W. Wang, L. Li, B. Li and J. Zhang, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/C9TA12921A

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