Facile synthesis of ultrafine SnO₂ nanoparticles on graphene nanosheets via thermal decomposition of tin-octoate as anode for lithium ion batteries

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• 作者：Jinkai Wang ; Sanmu Xie ; Daxian Cao ; Xuan Lu…
• 关键词：Lithium ion batteries ; In situ synthesis ; Graphene nanosheets ; SnO2 nanoparticles ; Superior electrochemical properties ; Two ; dimensional materials ; Energy storage
• 刊名：Journal of Nanoparticle Research
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：18
• 期：9
• 全文大小：1,548 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Nanotechnology
  Inorganic Chemistry
  Characterization and Evaluation Materials
  Physical Chemistry
  Applied Optics, Optoelectronics and Optical Devices
  
• 出版者：Springer Netherlands
• ISSN：1572-896X
• 卷排序：18

文摘

We demonstrate a facile synthesis of ultrafine SnO₂ nanoparticles within graphene nanosheets (GNSs) via thermal decomposition of tin-octoate, in which tin-octoate is firstly blended with GNSs followed by annealing in air at a low temperature (350 °C) and a short time (1 h). As anode for lithium ion batteries, the SnO₂/GNSs displays superior cycle and rate performance, delivering reversible capacities of 803 and 682 mA h/g at current densities of 200 and 500 mA/g after 120 cycles, respectively, much higher than that of pure SnO₂ and GNSs counterparts (143 and 310 mA h/g at 500 mA/g after 120 cycles, respectively). The enhanced electrochemical performance is attributed to the ultrafine SnO₂ nanoparticle size and introduction of GNSs. GNSs prevent the aggregation of the ultrafine SnO₂ nanoparticles, which alleviate the stress and also provide more electrochemically active sites for lithium insertion and extraction. Moreover, GNSs with large specific surface area (~363 m2/g) act as a good electrical conductor which greatly improves the electrode conductivity and also an excellent buffer matrix to tolerate the severe volume changes originated from the Li-Sn alloying-dealloying. This work provides a straight-forward synthetic approach for the design of novel composite anode materials with superior electrochemical performance.