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Sb/C composite anode for sodium-ionbatteries
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry. (Ångström Advanced Battery Centre, ÅABC)
2017 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this thesis, a Sb/C composite electrode for sodium-ion batteries isprepared by a simple high energy ball milling and calenderingmethod. The prepared Sb/C composite electrode was assembled in ahalf-cell and symmetrical cell setups in order to perform avariety of electrochemical measurements.The composite electrode showed a reversible specific capacity of595 mAh/g, at a discharge/charge current rate of 15 mA/g. Theelectrode also showed a relatively good performance (compared toprevious studies) of 95% capacity retention after more than 100cycles, at a higher discharge/charge current rate of 60 mA/g. Theelectrode furthermore showed excellent self-dischargecharacteristics, in pause tests implemented over 200 hours (overeight days), which underlined the electrode materials good shelflife properties. A series of Sb/C symmetrical cells assembledthrough-out the project, furthermore, highlighted the stability ofthe solid electrolyte interface (SEI) layer formed on the Sb/Ccomposite electrode during cycling. Scanning electron microscopy(SEM) and Energy-dispersive X-ray spectroscopy (EDS) were used tocharacterize the surface morphology and composition of the Sb/Celectrode, respectively.A non-milled and milled (12 hours) graphite electrodes were alsoprepared for reference and comparison. The milled graphite matrixelectrode provided a reversible capacity of 95 mAhg-1 and acoulombic efficiency (CE) of 99% in over 250 cycles, at a currentrate of 30 mA/g. Milled and non-milled graphite were characterizedwith SEM and Raman spectroscopy, to help have a fundamentalunderstanding of the particle size and material phase,respectively.

Place, publisher, year, edition, pages
2017. , p. 60
Series
UPTEC K, ISSN 1650-8297 ; 17015
Keywords [en]
Structural chemistry, Future battery, Battery, Sodium-ion battery, Anode, Antimony, Graphite, Alloy systems, Ball mill, Coat, Composite, Symmetrical-cell, Half-cell, Cycling, Capacity, Solid electrolyte interface
National Category
Energy Engineering Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-325794OAI: oai:DiVA.org:uu-325794DiVA, id: diva2:1116786
Educational program
Master Programme in Chemical Engineering
Presentation
2017-06-01, Ångströms 4004, Lägerhyddsvägen 1, Uppsala, 15:15 (English)
Supervisors
Examiners
Available from: 2017-06-28 Created: 2017-06-27 Last updated: 2017-06-28Bibliographically approved

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