Probing electrochemical reactivity in an Sb2S3-containing potassium-ion battery anode: Observation of an increased capacity

V. Lakshmi, Alexey A. Mikhaylov, Alexander G. Medvedev, Chao Zhang, Thrinathreddy Ramireddy, Md Mokhlesur Rahman, Pavel Cizek, Dmitri Golberg, Ying Chen, Ovadia Lev, Petr V. Prikhodchenko*, Alexey M. Glushenkov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Potassium-ion batteries are attracting considerable attention as a viable type of high voltage battery. Among available anode materials, composites containing Sb2S3are some of the most interesting high capacity candidates. A nanostructured Sb2S3-reduced graphene oxide composite anode material is evaluated in this study and compared with a structurally similar SnS2-reduced graphene oxide material reported previously by this team. The behaviour of the Sb2S3-based electrodes is assessed in both 1 M KPF6in ethylene carbonate-diethyl carbonate and 1 M KPF6in 1,2-dimethoxyethane electrolytes. Depotassiation capacities in excess of 650 mA h g−1are recorded for the composite electrodes, superior not only to SnS2-based electrodes but also to all previously reported Sb2S3-containing electrode materials for potassium-ion batteries. In order to establish insights into the reaction mechanism of the Sb2S3phase with potassium, post-cycling X-ray diffraction andin situtransmission electron microscopy are utilised. The recorded data suggest the presence of antimony alloys and potassium polysulphides as reaction products and intermediates; a possible conversion-alloying reaction mechanism is discussed. The results indicate that a capacity higher than previously believed is achievable in the Sb2S3active component of potassium-ion battery electrodes.

Original languageAmerican English
Pages (from-to)11424-11434
Number of pages11
JournalJournal of Materials Chemistry A
Volume8
Issue number22
DOIs
StatePublished - 14 Jun 2020

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry 2020.

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