Wu, Y;
Xu, Y;
Li, Y;
Lyu, P;
Wen, J;
Zhang, C;
Zhou, M;
... Lei, Y; + view all
(2019)
Unexpected intercalation-dominated potassium storage in WS₂ as a potassium-ion battery anode.
Nano Research
, 12
pp. 2997-3002.
10.1007/s12274-019-2543-0.
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Abstract
Unexpected intercalation-dominated process is observed during K^{+} insertion in WS_{2} in a voltage range of 0.01–3.0 V. This is different from the previously reported two-dimensional (2D) transition metal dichalcogenides that undergo a conversion reaction in a low voltage range when used as anodes in potassium-ion batteries. Charge/discharge processes in the K and Na cells are studied in parallel to demonstrate the different ion storage mechanisms. The Na^{+} storage proceeds through intercalation and conversion reactions while the K^{+} storage is governed by an intercalation reaction. Owing to the reversible K+ intercalation in the van der Waals gaps, the WS_{2} anode exhibits a low decay rate of 0.07% per cycle, delivering a capacity of 103 mAh·g^{-1} after 100 cycles at 100 mA·g^{-1}. It maintains 57% capacity at 800 mA·g^{-1} and shows stable cyclability up to 400 cycles at 500 mA·g-1. Kinetics study proves the facilitation of K^{+} transport is derived from the intercalation-dominated mechanism. Furthermore, the mechanism is verified by the density functional theory (DFT) calculations, showing that the progressive expansion of the interlayer space can account for the observed results.
Type: | Article |
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Title: | Unexpected intercalation-dominated potassium storage in WS₂ as a potassium-ion battery anode |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1007/s12274-019-2543-0 |
Publisher version: | https://doi.org/10.1007/s12274-019-2543-0 |
Language: | English |
Additional information: | © The Author(s) 2019. This article is licensed under a Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | potassium-ion battery, anode, WS_{2}, intercalation |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
URI: | https://discovery.ucl.ac.uk/id/eprint/10085864 |
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