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Towards Stable Li-metal electrodefor rechargeable batteries
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry. (Ångström Advanced Battery Centre)
2016 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Different types of alumina containing coatings were made on lithiumand copper in the purpose to mechanically hinder the growth ofdendrites. Lithium, coated with polymer-alumina composites wereplaced in symmetric cells for in situ studies by a light microscope.The coatings did not block the dendrites, but they did change thegrowth rate and morphology of them, probably throw both chemicalinteractions and changes in ion transportation. Also the stability ofcapacity were tested for the same coatings, the result showed abigger capacity drop for cells containing coated lithium versus cellswithout coatings.Attempted alumina coatings were also made by a solgel technique, bydirect reaction with the compound trimethylaluminium and with analumina containing acetonitrile solution.The theses also includes a study of the stability of lithium inadiponitrile. A higher amount of LiTFSI salt in adiponitrile could bythis study be reported to inhibit the dissolution of lithium that wasseen for lower salt concentrations. The dissolution appeared when thesolution was used as an electrolyte in a symmetric lithium cell. Somedifferences could be seen when the lithium surface were studied byXPS after interaction with high, low and zero concentration LiTFSI.Both the XPS studies and the absences of lithium dissolutionindicates that a more or less stable SEI had been formed.

Place, publisher, year, edition, pages
2016. , 46 p.
Series
UPTEC K, ISSN 1650-8297 ; 16023
Keyword [en]
Lithium metal, Battery, Dendrites, light microscopy, Adiponitrile, Al2O3
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:uu:diva-306694OAI: oai:DiVA.org:uu-306694DiVA: diva2:1044082
Subject / course
Material
Educational program
Master Programme in Chemical Engineering
Supervisors
Examiners
Available from: 2016-11-03 Created: 2016-11-02 Last updated: 2016-11-03Bibliographically approved

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