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Surface chemistry of carbon-treated LiFePO4 particles for Li-ion battery cathodes studied by PES
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry.
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2003 In: Electrochemical and solid state letters, ISSN 1099-0062, Vol. 6, no 9, A202-A206 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2003. Vol. 6, no 9, A202-A206 p.
URN: urn:nbn:se:uu:diva-96221OAI: oai:DiVA.org:uu-96221DiVA: diva2:170721
Available from: 2007-09-07 Created: 2007-09-07Bibliographically approved
In thesis
1. Stability Phenomena in Novel Electrode Materials for Lithium-ion Batteries
Open this publication in new window or tab >>Stability Phenomena in Novel Electrode Materials for Lithium-ion Batteries
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Li-ion batteries are not only a technology for the future, they are indeed already the technology of choice for today’s mobile phones, laptops and cordless power tools. Their ability to provide high energy densities inexpensively and in a way which conforms to modern environmental standards is constantly opening up new markets for these batteries. To be able to maintain this trend, it is imperative that all issues which relate safety to performance be studied in the greatest detail. The surface chemistry of the electrode-electrolyte interfaces is intrinsically crucial to Li-ion battery performance and safety. Unfortunately, the reactions occurring at these interfaces are still poorly understood. The aim of this thesis is therefore to increase our understanding of the surface chemistries and stability phenomena at the electrode-electrolyte interfaces for three novel Li-ion battery electrode materials.

Photoelectron spectroscopy has been used to study the surface chemistry of the anode material AlSb and the cathode materials LiFePO4 and Li2FeSiO4. The cathode materials were both carbon-coated to improve inter-particle contact. The surface chemistry of these electrodes has been investigated in relation to their electrochemical performance and X-ray diffraction obtained structural results. Surface film formation and degradation reactions are also discussed.

For AlSb, it has been shown that most of the surface layer deposition occurs between 0.50 and 0.01 V vs. Li°/Li+ and that cycling performance improves when the lower cut-off potential of 0.50 V is used instead of 0.01 V. For both LiFePO4 and Li2FeSiO4, the surface layer has been found to be very thin and does not provide complete surface coverage. Li2CO3 was also found on the surface of Li2FeSiO4 on exposure to air; this was found to disappear from the surface in a PC-based electrolyte. These results combine to give the promise of good long-term cycling with increased performance and safety for all three electrode materials studied.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2007. 49 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 343
Inorganic chemistry, Li-ion battery, electrode material, intermetallic, AlSb, lithium iron phosphate, lithium iron silicate, photoelectron spectroscopy, Oorganisk kemi
urn:nbn:se:uu:diva-8214 (URN)978-91-554-6969-6 (ISBN)
Public defence
2007-09-28, 4101, The Ångström Laboratory, Lägerhyddsvägen 1, Uppsala, 10:15
Available from: 2007-09-07 Created: 2007-09-07 Last updated: 2011-06-23Bibliographically approved

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