A vacuum deposited Si film having a Li extraction capacity over 2000 mAh/g with a long cycle life

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• 作者：Takamura ; Tsutomu ; Ohara ; Shigeki ; Uehara ; Makiko ; Suzuki ; Junji ; Sekine ; Kyoichi
• 关键词：Li-ion batteries ; Ultrahigh capacity anode ; Si film ; Vacuum deposition ; Surface roughening of substrate
• 刊名：Journal of Power Sources
• 出版年：2004
• 出版时间：April 15, 2004
• 年：2004
• 卷：129
• 期：1
• 页码：96-100
• 全文大小：176 K

文摘

We have found that a Si film vacuum deposited on a Ni foil has a Li insertion capacity over 2000mAh/g with cycleability over 1000cycles, but a great issue was its difficulty to obtain a sufficiently thicker film capable of high current charge/discharge. In the present paper the examination of the high current charge/discharge performance of thicker Si film in relation to the film formation condition. The electrochemical evaluation was performed with cyclic voltammetry (CV) and constant current charge/discharge test with various loading currents in PC containing 1M LiClO₄.