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New Insight into Desodiation/Sodiation Mechanism of MoS₂ : Sodium Insertion in Amorphous Mo–S Clusters

Title data

Wang, Kai ; Hua, Weibo ; Li, Zhenyou ; Wang, Qingsong ; Kübel, Christian ; Mu, Xiaoke:
New Insight into Desodiation/Sodiation Mechanism of MoS₂ : Sodium Insertion in Amorphous Mo–S Clusters.
In: ACS Applied Materials & Interfaces. Vol. 13 (2021) Issue 34 . - pp. 40481-40488.
ISSN 1944-8252
DOI: https://doi.org/10.1021/acsami.1c07743

Project information

Project title:
Project's official title
Project's id
Nachwuchsgruppe Lehrstuhl für Anorganische Aktivmaterialien electrochemischer Speicher Dr. Qingsong Wang
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Abstract in another language

Molybdenum disulfide (MoS2) is a promising anode material for sodium batteries due to its high theoretical capacity. While significantly improved electrochemical performance has been achieved, the reaction mechanism is still equivocal. Herein, we applied electron pair distribution function and X-ray absorption spectroscopy to investigate the desodiation/sodiation mechanism of MoS2 electrodes. The results reveal that Mo–S bonds are well preserved and dominant in the sodiation product matrix but do not convert to metallic Mo and Na2S even at deep sodiation. The MoS2 multilayer sheets break into disordered MoSx clusters with modified octahedral symmetry during discharging. The long-range order was not rebuilt during subsequent charging but with partial recovery of the Mo–S coordination symmetry. The mechanism of the reaction is independent of the carbon matrix, although it prevents the MoSx clusters from leaching into the electrolyte and thus contributes to an extended cycle life. This work refreshes the fundamental understanding of the desodiation/sodiation mechanism of MoS2 materials.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Lehrstuhl Anorganische Aktivmaterialien für elektrochemische Energiespeicher
Research Institutions > Research Centres > Bayerisches Zentrum für Batterietechnik - BayBatt
Faculties
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: No
DDC Subjects: 500 Science
500 Science > 540 Chemistry
Date Deposited: 02 Nov 2022 09:31
Last Modified: 02 Nov 2022 09:31
URI: https://eref.uni-bayreuth.de/id/eprint/72594