Alcántara, Ricardo ; Ortiz, Gregorio F. ; Lavela, Pedro ; Tirado, José L. ; Jaegermann, Wolfram ; Thißen, Andreas (2005)
Rotor blade grinding and re-annealing of LiCoO2: SEM, XPS, EIS and electrochemical study.
In: Journal of Electroanalytical Chemistry, 584 (2)
doi: 10.1016/j.jelechem.2005.07.011
Article, Bibliographie
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.
| Item Type: | Article |
|---|---|
| Erschienen: | 2005 |
| Creators: | Alcántara, Ricardo ; Ortiz, Gregorio F. ; Lavela, Pedro ; Tirado, José L. ; Jaegermann, Wolfram ; Thißen, Andreas |
| Type of entry: | Bibliographie |
| Title: | Rotor blade grinding and re-annealing of LiCoO2: SEM, XPS, EIS and electrochemical study |
| Language: | English |
| Date: | October 2005 |
| Journal or Publication Title: | Journal of Electroanalytical Chemistry |
| Volume of the journal: | 584 |
| Issue Number: | 2 |
| DOI: | 10.1016/j.jelechem.2005.07.011 |
| 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. |
| Uncontrolled Keywords: | Battery; XPS; Ac impedance; Galvanostatic Article Outline |
| Additional Information: | SFB 595 A3 |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Surface Science Zentrale Einrichtungen DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis > Subproject A3: Boundary layers and thin films of ionic conductors: Electronic structure, electrochemical potentials, defect formation and degradation mechanisms DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres DFG-Collaborative Research Centres (incl. Transregio) |
| Date Deposited: | 04 Aug 2011 09:22 |
| Last Modified: | 21 Mar 2015 15:22 |
| PPN: | |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Send an inquiry |
Options (only for editors)
 |
Show editorial Details |
Drucken
Impressum