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| Autor: | Jung-Kun Chang, 張榮坤 |
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| Rok vydání: | 2000 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 88 Microstructure evolution at different stage of charge-discharge process of the SnO2 thin film electrode of the secondary lithium battery was studied in this work. In particular, the identity and amount of various phases were monitored as the lithium were inserted or exacted from the electrode. The SnO2 thin film, though a negative-electrode material, served as the positive electrode in the charge-discharge process .The counter electrode was a pure lithium foil. As obtained from the X-ray diffraction examination, β-Sn phase increased gradually as the discharging process proceeded, reacting a maximum at the ending point of discharging(0.05V). Theβ-Sn phase then decreased gradually as the charging process proceed and finally disappeared at the end of charging(2.5V). TEM observation indicates that SnO2 was present at the initial stage of discharging (up to ~0.91V),and at replaced at the end of discharging byβ-Sn which showed some agglomeration. Cracks on the thin film were observed by SEM offer discharging. They were formed due to the expansive caused by the formation of low-density phases. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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