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Citation: ZHANG Hong-Fang, FU Ping-Ping, SONG Ying-Jie, DU Chen-Shu, YANG Hua-Bin, ZHOU Zuo-Xiang, WU Meng-Tao, HUANG Lai-He. Preparation and Properties of Sandwich-type Si/Fe/Si Film Anode for Lithium-ion Battery[J]. Acta Physico-Chimica Sinica, ;2007, 23(07): 1065-1070. doi: 10.3866/PKU.WHXB20070719 shu

Preparation and Properties of Sandwich-type Si/Fe/Si Film Anode for Lithium-ion Battery

1.
Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, P. R. China; Tianjin B&MScience and Technology Joint-Stock Co., Ltd., Tianjin 300384, P. R. China

Received Date: 28 December 2006
Available Online: 8 May 2007

A sandwich-type Si/Fe/Si film was deposited on Cu foil by magnetron sputtering. High-resolution transmission electron microscope (HRTEM) and selected area electron diffraction (SAED) results indicated that the sputtered film had an amorphous structure. The cross-sectional scanning electron microscope (SEM) images and the energy dispersive X-ray spectrometry (EDXS) spectra showed that the thickness of the filmwas 3.2 μm, and its volume expansion ratio was up to 265% after the prolonged electrochemical lithiation and delithiation cycles. In the potential range 1.5-0.005 V (vs Li+/Li) at the current density of 0.1 mA·cm-2, the film anode exhibited a high initial lithiation capacity around 1.85 mAh·cm-2, and reached the highest reversible delithiation capacity of 0.84 mAh·cm-2 after 70 cycles. After 200 cycles, it still retained a reversible capacity of 0.55 mAh·cm-2, which was 66%of the highest reversible capacity. The introduction of Fe to Si not only improved the conductivity of the film, which partially reduced the voltage hysteresis, but also effectively suppressed the volume expansion, which led to a prolonged cycle life.
- Lithium-ion battery; Anode material; Magnetron sputtering; Sandwich-type structure; Si/Fe/Si film
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