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Enhancing potassium-ion battery performance by defect and interlayer engineering

Abstract

Defect and interlayer engineering is applied to exploit the large van der Waals gaps of transition metal dichalcogenides for potassium-ion batteries (KIBs). As a demonstrator, MoS2 nanoflowers with expanded interlayer spacing and defects in basal planes are used as KIB anodes in the voltage range of 0.5-2.5 V, where an intercalation reaction rather than a conversion reaction takes place to store K-ions in the van der Waals gaps. The nanoflowers show enhanced K-storage performance compared to the defect-free counterpart that has pristine interlayer spacing. Kinetic analysis verifies that K-ion diffusion coefficient and surface charge storage are both enhanced in the applied voltage range of intercalation reaction. The collective effects of expanded interlayer spacing and additionally exposed edges induced by the in-plane defects enable facile K-ion intercalation, rapid K-ion transport and promoted surface K-ion adsorption simultaneously.

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Publication details

The article was received on 13 Sep 2018, accepted on 09 Oct 2018 and first published on 09 Oct 2018


Article type: Communication
DOI: 10.1039/C8NH00305J
Citation: Nanoscale Horiz., 2018, Accepted Manuscript
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    Enhancing potassium-ion battery performance by defect and interlayer engineering

    Y. Xu, F. Bahmani, M. Zhou, Y. Li, C. Zhang, F. Liang, S. H. Kazemi, U. Kaiser, G. Meng and Y. Lei, Nanoscale Horiz., 2018, Accepted Manuscript , DOI: 10.1039/C8NH00305J

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