Reduction of irreversibility in the first charge of tin oxide thin film negative electrodes

Sputter deposited 300 nm-thick tin oxide thin films into which metallic lithium (600 nm) was reacted were studied to develop a new negative electrode for thin film rechargeable lithium batteries. The crystal structure and chemical composition of the lithium reacted tin oxide films were characterised...

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Veröffentlicht in:Journal of the Electrochemical Society 2001, Vol.148 (3), p.A220-A223
Hauptverfasser: NAM, S. C, YOON, Y. S, CHO, W. I, CHO, B. W, CHUN, H. S, YUN, K. S
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Sprache:eng
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Zusammenfassung:Sputter deposited 300 nm-thick tin oxide thin films into which metallic lithium (600 nm) was reacted were studied to develop a new negative electrode for thin film rechargeable lithium batteries. The crystal structure and chemical composition of the lithium reacted tin oxide films were characterised by XRD and Auger electron spectroscopy, respectively. The charge/discharge performances of these films exhibited capacities > 400 mAh/g for > 75 cycles. There was no irreversible plateau near 0.8 V vs Li/Li+ due to reduction of SnO2 to Sn and Li2O during the first charge half-cycle. XRD and scanning transmission electron microscopy results suggest that the lithium-reacted tin oxide thin film consists of metallic tin, lithium oxide, and reduced tin oxide, and the reacted thin films show reduced microcracks created by density fluctuations. 11 refs.
ISSN:0013-4651
1945-7111
DOI:10.1149/1.1346603