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The influence of lithium salt on the interfacial reactions controlling the thermal stability of graphite anodes
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för materialkemi.
2002 Ingår i: Electrochimica Acta, ISSN 0013-4686, Vol. 47, nr 12, s. 1847-2024Artikel i tidskrift (Refereegranskat) Published
Ort, förlag, år, upplaga, sidor
2002. Vol. 47, nr 12, s. 1847-2024
Identifikatorer
URN: urn:nbn:se:uu:diva-90738OAI: oai:DiVA.org:uu-90738DiVA, id: diva2:163197
Tillgänglig från: 2003-09-04 Skapad: 2003-09-04Bibliografiskt granskad
Ingår i avhandling
1. Towards Safer Lithium-Ion Batteries
Öppna denna publikation i ny flik eller fönster >>Towards Safer Lithium-Ion Batteries
2003 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2003. s. 52
Serie
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 876
Nyckelord
Inorganic chemistry, lithium-ion batteries, photoelectron spectroscopy, surface film, thermal stability, electrolyte additive, graphite, lithium iron phosphate, Oorganisk kemi
Nationell ämneskategori
Oorganisk kemi
Forskningsämne
oorganisk kemi
Identifikatorer
urn:nbn:se:uu:diva-3542 (URN)91-554-5709-6 (ISBN)
Disputation
2003-09-26, Häggsalen, Ångström Laboratory, Uppsala, 10:15
Opponent
Handledare
Tillgänglig från: 2003-09-04 Skapad: 2003-09-04Bibliografiskt granskad

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