Capacity fading of LiMn2O4electrode: Influence of calcination temperature
| Autor: | Ho Gi Kim, KS Park, HT Chung, JT Son |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Materials science
Scanning electron microscope Mechanical Engineering Spinel Inorganic chemistry engineering.material Cathode law.invention chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials law Electrode engineering General Materials Science Calcination Titration Lithium oxide Powder diffraction |
| Zdroj: | Journal of Materials Science. 39:3635-3639 |
| ISSN: | 0022-2461 |
| Popis: | Spinel-type Li-Mn oxides of formula LiMn2−x O4 were prepared by the Pechini method in the range of 600–850°C for 4 h. These spinels were investigated by X-ray powder diffraction, SEM (scanning electron microscope), ICP, chemical titration and galvanostatic cycling at 0.2C rates. The effect of calcination temperature is evaluated. With increasing calcination temperature, Mn valence-state of the powder decreased while size of powder increased. The cycle life of the powder decreases with increasing calcination temperature. The results indicated that the Mn valence-state and powder size of cathode powder should be important variables to improve cycle life. The effect of cell polarization effect on the cycle life is also discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|