Order-Disorder Transition in Rutile VO2(M) Electrodes during Li Intercalation and Extraction

Morten Johansen; Dorthe B Ravnsbæk

doi:10.1021/acsomega.4c02839

Order-Disorder Transition in Rutile VO₂(M) Electrodes during Li Intercalation and Extraction

^*Corresponding author af dette arbejde

Institut for Kemi

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

Abstract

Transition metal oxides are widely employed as electrode materials in Li-ion batteries. During battery operation, Li ions are intercalated and extracted from the framework of the electrode structure, causing structural transitions. In some materials, the process can drive order-disorder transitions; however, insights into such processes are generally lacking, although they are essential for our understanding of battery aging and in the design of new sustainable battery chemistries. Herein, we investigate the intercalation-induced order-disorder transition in rutile VO 2(M) electrodes by means of galvanostatic charge/discharge cycling, operando powder X-ray diffraction, and total X-ray scattering with pair distribution function analysis. The study reveals that the rutile structure transforms irreversibly into a highly disordered layered Li x VO 2 structure, which is capable of reversibly intercalating Li ions. Our findings point out general trends for the intercalation-driven transitions in rutile oxides.

Originalsprog	Engelsk
Tidsskrift	ACS Omega
Vol/bind	9
Nummer	34
Sider (fra-til)	36291-36298
Antal sider	8
ISSN	2470-1343
DOI	https://doi.org/10.1021/acsomega.4c02839
Status	Udgivet - 27 aug. 2024

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10.1021/acsomega.4c02839Licens: CC BY-NC-ND

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Citationsformater

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AB - Transition metal oxides are widely employed as electrode materials in Li-ion batteries. During battery operation, Li ions are intercalated and extracted from the framework of the electrode structure, causing structural transitions. In some materials, the process can drive order-disorder transitions; however, insights into such processes are generally lacking, although they are essential for our understanding of battery aging and in the design of new sustainable battery chemistries. Herein, we investigate the intercalation-induced order-disorder transition in rutile VO 2(M) electrodes by means of galvanostatic charge/discharge cycling, operando powder X-ray diffraction, and total X-ray scattering with pair distribution function analysis. The study reveals that the rutile structure transforms irreversibly into a highly disordered layered Li x VO 2 structure, which is capable of reversibly intercalating Li ions. Our findings point out general trends for the intercalation-driven transitions in rutile oxides.

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