Electrochemical behaviors of porous SnO₂-Sn/C composites derived from pyrolysis of SnO₂/poly(vinylidene fluoride)

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• 作者：Xiaolei Sun ; Xinghui Wang ; Li Qiao ; Duokai Hu ; Na Feng ; Xiuwan Li ; Yingqi Liu ; Deyan He ; ^{hedy@lzu.edu.cn}
• 关键词：Pyrolysis ; Tin oxide ; Porous carbon ; Anode ; Lithium ion batteries
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：1 April, 2012
• 卷：66
• 期：Complete
• 页码：204-209
• 文件大小：1050 K

摘要

Porous SnO₂-Sn/C composites have been synthesized via directly pyrolysis of mixtures of SnO₂ powder and poly(vinylidene fluoride) without any surfactant addition and other treatment. The composites are composed of SnO₂ and Sn nanoparticles which are well encapsulated in porous carbon matrix as characterized by transmission electron microscopy, X-ray powder diffraction and micro-Raman spectrometer. The obtained materials were used as anode for lithium ion batteries, a discharge capacity of 1171 mAh g^鈭? and a charge capacity of 611 mAh g^鈭? were shown in the first cycle at a current density of 100 mA g^鈭?, and good cycling performance achieved even at current density as high as 800 mA g^鈭?. The good electrochemical behaviors could be attributed to the formation of Sn nanoparticles which can increase the reversible capacity and the porous carbon matrix which is of excellent buffering effect and high electronic conductivity.