Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 22, Pages 11424-11434Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta03555f
Keywords
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Funding
- Deakin Advanced Characterisation Facility
- Australian Research Council (ARC) [FL160100089, LP170100784, 323000-0355]
- Russian Science Foundation [16-13-00110]
- Deakin International Postgraduate Scholarship
- Australian Research Council [LP170100784] Funding Source: Australian Research Council
- Russian Science Foundation [19-13-11015] Funding Source: Russian Science Foundation
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Potassium-ion batteries are attracting considerable attention as a viable type of high voltage battery. Among available anode materials, composites containing Sb(2)S(3)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 1 M KPF(6)in ethylene carbonate-diethyl carbonate and 1 M KPF(6)in 1,2-dimethoxyethane electrolytes. Depotassiation capacities in excess of 650 mA h g(-1)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 Sb(2)S(3)phase 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 Sb(2)S(3)active component of potassium-ion battery electrodes.
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