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Rate capability of natural graphite as anode material in Li-ion batteries
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
2003 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 124, no 1, 191-196 p.Article in journal (Refereed) Published
Abstract [en]

Jet-milled natural Swedish graphite has been evaluated as an anode material for Li-ion battery applications, with a focus on rate capability of the material. The material was found to have a superior rate capability compared to other carbon materials with similar particle sizes. It could also intercalate and deintercalate lithium reversibly in an electrolyte based on propylene carbonate:ethylene carbonate (1:1). Jet-milling was found to increase the amount of rhombohedral phase (3R) in the material from 15 to 40%. However, after repeated electrochemical intercalation and deintercalation of lithium, the amount of 3R phase decreases to ~5%. Neither rate capability nor PC-tolerance can therefore be correlated to the amount of 3R phase.

Place, publisher, year, edition, pages
2003. Vol. 124, no 1, 191-196 p.
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-90741DOI: 10.1016/S0378-7753(03)00603-7OAI: oai:DiVA.org:uu-90741DiVA: diva2:163200
Available from: 2003-09-04 Created: 2003-09-04 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Towards Safer Lithium-Ion Batteries
Open this publication in new window or tab >>Towards Safer Lithium-Ion Batteries
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Surface film formation at the electrode/electrolyte interface in lithium-ion batteries has a crucial impact on battery performance and safety. This thesis describes the characterisation and treatment of electrode interfaces in lithium-ion batteries. The focus is on interface modification to improve battery safety, in particular to enhance the onset temperature for thermally activated reactions, which also can have a negative influence on battery performance.

Photoelectron Spectroscopy (PES) and Differential Scanning Calorimetry (DSC) are used to investigate the surface chemistry of electrodes in relation to their electrochemical performance. Surface film formation and decomposition reactions are discussed.

The upper temperature limit for lithium-ion battery operation is restricted by exothermic reactions at the graphite anode; the onset temperature is shown to be governed by the composition of the surface film on the anode. Several electrolyte salts, additives and an anion receptor have been exploited to modify the surface film composition. The most promising thermal behaviour is found for graphite anodes cycled with the anion receptor, tris(pentafluorophenyl)borane, which reduces salt reactions and increases the onset temperature from ~80 °C to ~150 °C.

The electrochemical performance and surface chemistry of Swedish natural graphite, carbon-treated LiFePO4 and anodes from high-power lithium-ion batteries are also investigated. Jet-milled Swedish natural graphite exhibits a high capacity and rate capability, together with a decreased susceptibility to solvent co-intercalation. Carbon-treated LiFePO4 shows promising results: no solvent reaction products are detected. The amount of salt compounds increases, with power fade occurring for anodes from high-power lithium-ion batteries; the solvent reduction products comprise mainly Li-carboxylate type compounds.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2003. 52 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 876
Keyword
Inorganic chemistry, lithium-ion batteries, photoelectron spectroscopy, surface film, thermal stability, electrolyte additive, graphite, lithium iron phosphate, Oorganisk kemi
National Category
Inorganic Chemistry
Research subject
Inorganic Chemistry
Identifiers
urn:nbn:se:uu:diva-3542 (URN)91-554-5709-6 (ISBN)
Public defence
2003-09-26, Häggsalen, Ångström Laboratory, Uppsala, 10:15
Opponent
Supervisors
Available from: 2003-09-04 Created: 2003-09-04Bibliographically approved

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Edström, Kristina

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