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Suppressing the Shuttle Effect and Dendrite Growth in Lithium-Sulfur Batteries.

Wang, J., Yi, S., Liu, J., Sun, S., Liu, Y., Yang, D., Xi, K., Gao, G., Abdelkader, A.M., Yan, W., Ding, S. and Kumar, R.V., 2020. Suppressing the Shuttle Effect and Dendrite Growth in Lithium-Sulfur Batteries. ACS Nano, 14 (8), 9819 - 9831.

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DOI: 10.1021/acsnano.0c02241

Abstract

Practical applications of lithium-sulfur batteries are simultaneously hindered by two serious problems occurring separately in both electrodes, namely, the shuttle effects of lithium polysulfides and the uncontrollable growth of lithium dendrites. Herein, to explore a facile integrated approach to tackle both problems as well as guarantee the efficient charge transfer, we used two-dimension hexagonal VS2 flakes as the building blocks to assemble nanotowers on the separators, forming a symmetrical double-side-modified polypropylene separator without blocking the membrane pores. Benefiting from the "sulfiphilic" and "lithiophilic" properties, high interfacial electronic conductivity, and the unique hexagonal tower-form nanostructure, the D-HVS@PP separator not only guarantees the effective suppression of the lithium polysulfide shuttle and the rapid ion/electron transfer but also realizes uniform and stable lithium nucleation and growth during cycling. Hence, just at the expense of an 11% increase in the separator weight (0.14 mg cm-2), the D-HVS@PP separator delivers an over 16 times higher initial areal capacity (8.3 mAh cm-2) than a conventional PP separator (0.5 mAh cm-2) under high sulfur-loading conditions (9.24 mg cm-2). Even when used under a low electrolyte/sulfur ratio of 4 mL g-1 and a practically relevant N/P ratio of 1.7, the D-HVS@PP separator still enabled stable cycling with a high cell-level gravimetric energy density. The potentials in broader applications (Li-S pouch battery and Li-LiFePO4 battery) and the promising commercial prospect (large-scale production and recyclability) of the developed separator are also demonstrated.

Item Type:Article
ISSN:1936-0851
Uncontrolled Keywords:amphiphilic ; lithium dendrites ; lithium−sulfur batteries ; recyclable ; separator ; shuttle effect
Group:Faculty of Science & Technology
ID Code:34523
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:22 Sep 2020 09:01
Last Modified:28 Sep 2020 09:25

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