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Morphology of electrodeposited Na on Al electrodes
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
2019 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The demand for alternative secondary batteries to lithium-ion batteries (LIBs) grows. Sodium-ion batteries (SIBs) have been studied for many years and could replace LIBsfor some application. Metallic anodes for both LIBs and SIBs are interesting due totheir high energy densities. Several aspects such as reactivity, stability and depositionmorphology must be properly addressed before metallic Na could be considered apossible anode material. This study aims to evaluate deposition of Na on Alelectrodes using fundamental electrochemical theories. Na deposition was studiedusing pouch cells and sodium triflate (NaOTf) in dimethyl glycol ether (diglyme) aselectrolyte. Galvanostatic deposition using different current densities, electrolyteconcentrations and potential pulses prior to galvanostatic deposition were tested. Theelectrochemical methods used in this study were galvanostatic deposition andchronoamperometry. The morphology of deposited Na was analyzed with ex-situscanning electron microscopy (SEM). A decrease of the size of deposited Na islandswas observed for both increasing current density and decreasing electrolyteconcentration. Fluctuations and poor stability in the deposition potential wereobtained when decreasing the electrolyte concentration under 0.5 M and also whenincreasing the current density over 1 mA cm-2. The most homogeneous depositionwas obtained with a 1030 ms potential pulse amplitude (-3 V vs. Na+/Na) prior togalvanostatic deposition (1 mA cm-2, 0.5 mAh cm-2) using 0.1 M NaOTf in diglyme aselectrolyte. Reproducibility was a major issue in this study and further investigation ofseveral parameters is needed.

Place, publisher, year, edition, pages
2019. , p. 31
Series
UPTEC K, ISSN 1650-8297 ; 19030
Keywords [en]
Electrodeposition, Morphology, Sodium-ion batteries
National Category
Engineering and Technology Other Chemical Engineering Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-390801OAI: oai:DiVA.org:uu-390801DiVA, id: diva2:1342721
Subject / course
Chemistry
Educational program
Master Programme in Chemical Engineering
Presentation
2019-07-03, Å4003, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Supervisors
Examiners
Available from: 2019-08-14 Created: 2019-08-14 Last updated: 2019-08-14Bibliographically approved

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Engineering and TechnologyOther Chemical EngineeringInorganic Chemistry

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CiteExportLink to record
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Citation style
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