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Li4Ti5O12 as an anode material for Li ion batteries in situ XRD and XPS studies
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
2013 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis examines parts of the kinetics and performance in Li-battery cells using lithium titanate anodes and lithium manganese oxide cathodes. Lithium titanate (Li4Ti5O12) is a candidate for battery applications in automotive vehicles due to its long lifetime and its suggested zero-strain ability. The zero-strain ability, meaning no volume changes in the material during cycling, would allow for the high charge/discharge rates required in electric vehicles. Two approaches of analysis have been performed. In situ XRD-analysis was used to verify the zero-strain ability of lithium titanate and XPS studies were used to analyze the surface chemistry of lithium titanate after cycling. It is known that lithium titanate/lithium manganeseoxide battery cells suffer from abnormal gas evolution and power degradation, and it is therefore of interest to find ways to prevent this. To be able to find methods of preventing the performance degradation deeper understanding of the kinetics are needed, since the mechanism behind this is not fully understood. The results in this thesis strengthen the understanding of lithium titanate as a zero-strain material. Furthermore, it is seen that the performance degradation possibly can be avoided or postponed by ALD deposition of aluminium oxide on the surface of the lithium manganese oxide electrode.

Place, publisher, year, edition, pages
2013. , 40 p.
Series
UPTEC K, ISSN 1650-8297 ; 13001
Keyword [en]
Li4Ti5O12 Titanate
National Category
Other Chemical Engineering
Identifiers
URN: urn:nbn:se:uu:diva-196056OAI: oai:DiVA.org:uu-196056DiVA: diva2:609075
Subject / course
Chemistry
Educational program
Master Programme in Chemical Engineering
Presentation
2013-01-17, Å 2002, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Uppsok
Technology
Supervisors
Examiners
Available from: 2013-03-18 Created: 2013-03-04 Last updated: 2013-03-18Bibliographically approved

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CiteExportLink to record
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