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

Abstract

Potassium-ion batteries are attracting considerable attention as a viable type of high voltage batteries. Among available anode materials, composites containing Sb2S3 are 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 1M KPF6 in ethylene carbonate – diethyl carbonate and 1M KPF6 in 1,2-dimethoxyethane electrolytes. Depotassation capacities in excess of 650 mAh/g are 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 Sb2S3 phase with potassium, post-cycling x-ray diffraction and in-situ transmission 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 considerably higher than previously believed is achievable in the Sb2S3 active component of potassium-ion battery electrodes.

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Supplementary files

Article information


Submitted
31 Mar 2020
Accepted
21 May 2020
First published
22 May 2020

J. Mater. Chem. A, 2020, Accepted Manuscript
Article type
Paper

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

P. Cizek, V. Lakshmi, A. A. Mikhaylov, A. G. Medvedev, C. Zhang, T. RAMIREDDY, M. M. Rahman, D. GOLBERG, Y. Chen, O. Lev, P. V. Prikhodchenko and A. M. Glushenkov, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/D0TA03555F

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