The effect of nitrogen on the cycling performance in thin-film Si_1−x

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• 作者：Donggi Ahn ; Chunjoong Kim ; Joon-Gon Lee ; Byungwoo Park
• 关键词：Si– ; N alloy ; Anode ; Thin film ; Li-ion battery
• 刊名：Journal of Solid State Chemistry
• 出版年：2008
• 出版时间：September 2008
• 年：2008
• 卷：181
• 期：9
• 页码：2139-2142
• 全文大小：707 K

文摘

The effects of nitrogen on the electrochemical properties of silicon–nitrogen (Si_1−xN_x) thin films were examined in terms of their initial capacities and cycling properties. In particular, Si_0.76N_0.24 thin films showed negligible initial capacity but an abrupt capacity increase to 2300 mA h/g after 650 cycles. The capacity of pure Si thin films was deteriorated to 20 % of the initial level after 200 cycles between 0.02 and 1.2 V at 0.5 C (1 C=4200 mA/g), whereas the Si_0.76N_0.24 thin films exhibited excellent cycle-life performance after 650 cycles. In addition, the Si_0.76N_0.24 thin films at 50 °C showed an abrupt capacity increase at an earlier stage of only 30 cycles. The abnormal electrochemical behaviors in the Si_0.76N_0.24 thin films were demonstrated to be correlated with the formation of Li₃N and Si₃N₄.