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21.02.2023 | Original Article

Electrochemically exfoliated WS₂ in molten salt for sodium-ion battery anode

verfasst von: Bei-Lei Zhang, Xiang Chen, Hai-Jia Zhao, Hong-Wei Xie, Hua-Yi Yin

Erschienen in: Rare Metals | Ausgabe 4/2023

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Abstract

The poor crystallinity and unstable crystal structure of tungsten disulfide (WS₂) limit its application in practice. In this paper, a molten salt electrolysis method is proposed to intercalate metal ions into the interlayers of layered WS₂ to obtain few-layer sheetlike structures. The effect of the molten salt system, applied constant current and electrolysis duration on the exfoliation degree of WS₂ bulk has been investigated. The results show that the products electrolyzed in molten LiCl-NaCl-KCl and NaCl-KCl salts under 25 mA were more transparent and thinner flakes sheets due to the uniform intercalation of Li⁺ and Na⁺ with smaller size. The exfoliated WS₂ was used as an anode material for sodium-ion batteries with a potential of 0.01–2.50 V. In comparison, the WS₂-NaCl-25 mA electrode displays a high reversible capacity of 373 mAh·g^–1 at 0.1 A·g^–1 after cycling for 100 cycles at the same time showing great rate and cycle performance. It also presents a high capacitive ratio of 90.65% at 1.0 mV·s^–1. The molten salt electrolysis provides a new perspective on the exfoliation of layered material, while demonstrating the great potential of WS₂ as an anode material for sodium-ion battery.

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Vorheriger Artikel Ultrafine SnO2 in situ modified graphite felt derived from metal–organic framework as a superior electrode for vanadium redox flow battery

Nächster Artikel Mechanism of Li+/Na+ separation by crown ether and butyrate acid root

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Titel: Electrochemically exfoliated WS2 in molten salt for sodium-ion battery anode
verfasst von: Bei-Lei Zhang
Xiang Chen
Hai-Jia Zhao
Hong-Wei Xie
Hua-Yi Yin
Publikationsdatum: 21.02.2023
Verlag: Nonferrous Metals Society of China
Erschienen in: Rare Metals / Ausgabe 4/2023
Print ISSN: 1001-0521
Elektronische ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-022-02209-5

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Abstract

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