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Rotor blade grinding and re-annealing of LiCoO2: SEM, XPS, EIS and electrochemical study

Alcántara, Ricardo ; Ortiz, Gregorio F. ; Lavela, Pedro ; Tirado, José L. ; Jaegermann, Wolfram ; Thißen, Andreas :
Rotor blade grinding and re-annealing of LiCoO2: SEM, XPS, EIS and electrochemical study.
[Online-Edition: http://dx.doi.org/10.1016/j.jelechem.2005.07.011]
In: Journal of Electroanalytical Chemistry, 584 (2) pp. 147-156. ISSN 15726657
[Artikel], (2005)
Note:

SFB 595 A3

Offizielle URL: http://dx.doi.org/10.1016/j.jelechem.2005.07.011

Kurzbeschreibung (Abstract)

The layered particles of lithium cobalt oxide (LiCoO2) have been modified using rotor blade grinding, re-annealing, and a combination of both treatments. SEM, XPS and EIS were used to study the effects of these treatments on the LiCoO2 particles, and changes in electrochemical behaviour in the 4-V region vs. Li+/Li were explored. After short grinding times (20 min), primary layered particles formed larger aggregates and poor electrochemical behaviour was observed. After 60 min grinding, LiCoO2 showed a net improvement in reversible specific capacity and capacity retention, which is due to the formation of ultrafine layered particles. Further grinding up to 180 min lead to surface carbonation, increased impedances and poor electrochemical performance. Re-annealing improved the electrochemical behaviour of both ground and unground LiCoO2. The best electrochemical behaviour was observed after grinding for 60 min and then re-annealing at 850 °C, which is linked with a low charge transfer resistance. XPS measurements revealed that the particles surface remained unchanged after heating to 500 °C, while heating to 850 °C eliminated surface carbonates, and prolonged grinding yielded extended surface carbonation.

Typ des Eintrags: Artikel
Erschienen: 2005
Autor(en): Alcántara, Ricardo ; Ortiz, Gregorio F. ; Lavela, Pedro ; Tirado, José L. ; Jaegermann, Wolfram ; Thißen, Andreas
Titel: Rotor blade grinding and re-annealing of LiCoO2: SEM, XPS, EIS and electrochemical study
Sprache: Englisch
Kurzbeschreibung (Abstract):

The layered particles of lithium cobalt oxide (LiCoO2) have been modified using rotor blade grinding, re-annealing, and a combination of both treatments. SEM, XPS and EIS were used to study the effects of these treatments on the LiCoO2 particles, and changes in electrochemical behaviour in the 4-V region vs. Li+/Li were explored. After short grinding times (20 min), primary layered particles formed larger aggregates and poor electrochemical behaviour was observed. After 60 min grinding, LiCoO2 showed a net improvement in reversible specific capacity and capacity retention, which is due to the formation of ultrafine layered particles. Further grinding up to 180 min lead to surface carbonation, increased impedances and poor electrochemical performance. Re-annealing improved the electrochemical behaviour of both ground and unground LiCoO2. The best electrochemical behaviour was observed after grinding for 60 min and then re-annealing at 850 °C, which is linked with a low charge transfer resistance. XPS measurements revealed that the particles surface remained unchanged after heating to 500 °C, while heating to 850 °C eliminated surface carbonates, and prolonged grinding yielded extended surface carbonation.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of Electroanalytical Chemistry
Band: 584
(Heft-)Nummer: 2
Freie Schlagworte: Battery; XPS; Ac impedance; Galvanostatic Article Outline
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Oberflächenforschung / Surface Science
Zentrale Einrichtungen
Zentrale Einrichtungen > Sonderforschungsbereich 595
Zentrale Einrichtungen > Sonderforschungsbereich 595 > A - Synthese
Zentrale Einrichtungen > Sonderforschungsbereich 595 > A - Synthese > A3
Hinterlegungsdatum: 04 Aug 2011 09:22
Offizielle URL: http://dx.doi.org/10.1016/j.jelechem.2005.07.011
Zusätzliche Informationen:

SFB 595 A3

ID-Nummer: 10.1016/j.jelechem.2005.07.011
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