Electrodeposited Si film with excellent stability and high rate performance for lithium-ion battery anodes

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• 作者：Guangyu Zhao^a ; ^b ; Yufeng Meng^a ; ^b ; Naiqing Zhang^a ; ^b ; Kening Sun^b ; ^{keningsun@yahoo.com.cn}
• 关键词：Electrodeposition ; Energy storage and conversion ; Thin films
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：1 June, 2012
• 卷：76
• 期：Complete
• 页码：55-58
• 文件大小：717 K

摘要

Si film was prepared by electrodepositing on Ni substrate. SEM images and EDS analysis illustrated that the Si film was obtained successfully. The Si film anodes displayed a high reversible specific capacity (over 2800 mAhg^鈭?#xA0;1), an excellent stability (little fading after 80 cycles at a current of 0.36 Ag^鈭?#xA0;1, corresponding to 0.1 C), high rate performances (850 mAhg^鈭?#xA0;1 at a current of 18 Ag^鈭?#xA0;1, corresponding to 5 C) and high electrochemical stability (The capacity was still more than 2600 mAhg^鈭?#xA0;1, when the current density returned to 0.36 Ag^鈭?#xA0;1 after cycling at the high current densities). Electrochemical impedance spectroscopy tests showed that the Li⁺ diffusion coefficient of the Si film was much higher than the pristine Si nanoparticles, which resulted in the high rate performances of the Si film.