Lithium intercalation/de-intercalation behavior of a composite Sn/C thin film fabricated by magnetron sputtering
来源期刊：Rare Metals2008年第5期
论文作者：ZHAO Lingzhi a, b, c, HU Shejun a, c, d, LI Weishan a, c, LI Liming b, and HOU Xianhua a, c a Department of Chemistry, South China Normal University, Guangzhou , China b Faculty of Material and Energy, Guangdong University of Technology, Guangzhou , China c Key Lab of Technology on Electrochemical Energy Storage and Power Generation in Guangdong Universities, Guangzhou , China d Department of Mathematics and Physics, Wuyi University, Jiangmen , China
文章页码：507 - 512
摘 要：A tin film of 320 nm in thickness on Cu foil and its composite film with graphite of ～50 nm in thickness on it were fabricated by magnetron sputtering. The surface morphology, composition, surface distributions of alloy elements, and lithium intercalation/de-intercalation behaviors of the fabricated films were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, electron probe microanalyzer （EPMA）, X-ray photoelectron spectroscopy （XPS）, inductively coupled plasma atomic emission spectrometry （ICP）, cyclic voltammetry （CV）, and galvanostatic charge/discharge （GC） measurements. It is found that the lithium intercalation/de-intercalation behavior of the Sn film can be significantly improved by its composite with graphite. With cycling, the discharge capacity of the Sn film without composite changes from 570 mAh/g of the 2nd cycle to 270 mAh/g of the 20th cycle, and its efficiency for the discharge and charge is between 90% and 95%. Nevertheless, the discharge capacity of the composite Sn/C film changes from 575 mAh/g of the 2nd cycle to 515 mAh/g of the 20th cycle, and its efficiency for the discharge and charge is between 95% and 100%. The performance improvement of tin by its composite with graphite is ascribed to the retardation of the bulk tin cracking from volume change during lithium intercalation and de-intercalation, which leads to the pulverization of tin.
ZHAO Lingzhi a, b, c, HU Shejun a, c, d, LI Weishan a, c, LI Liming b, and HOU Xianhua a, c a Department of Chemistry, South China Normal University, Guangzhou 510006, China b Faculty of Material and Energy, Guangdong University of Technology, Guangzhou 510006, China c Key Lab of Technology on Electrochemical Energy Storage and Power Generation in Guangdong Universities, Guangzhou 510006, China d Department of Mathematics and Physics, Wuyi University, Jiangmen 529020, China
摘 要：A tin film of 320 nm in thickness on Cu foil and its composite film with graphite of ～50 nm in thickness on it were fabricated by magnetron sputtering. The surface morphology, composition, surface distributions of alloy elements, and lithium intercalation/de-intercalation behaviors of the fabricated films were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, electron probe microanalyzer （EPMA）, X-ray photoelectron spectroscopy （XPS）, inductively coupled plasma atomic emission spectrometry （ICP）, cyclic voltammetry （CV）, and galvanostatic charge/discharge （GC） measurements. It is found that the lithium intercalation/de-intercalation behavior of the Sn film can be significantly improved by its composite with graphite. With cycling, the discharge capacity of the Sn film without composite changes from 570 mAh/g of the 2nd cycle to 270 mAh/g of the 20th cycle, and its efficiency for the discharge and charge is between 90% and 95%. Nevertheless, the discharge capacity of the composite Sn/C film changes from 575 mAh/g of the 2nd cycle to 515 mAh/g of the 20th cycle, and its efficiency for the discharge and charge is between 95% and 100%. The performance improvement of tin by its composite with graphite is ascribed to the retardation of the bulk tin cracking from volume change during lithium intercalation and de-intercalation, which leads to the pulverization of tin.
关键词：
