3D RGO frameworks wrapped hollow spherical SnO₂-Fe₂O₃ mesoporous nano-shells: fabrication, characterization and lithium storage properties

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• 作者：Bo Zhao^a ; ^b ; Yi-Tao Xu^a ; Sheng-Yun Huang^a ; Kai Zhang^c ; Matthew M.F. Yuen^c ; Jian-Bin Xu^d ; Xian-Zhu Fu^a ; ^{xz.fu@siat.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Rong Sun^a ; ^{rong.sun@siat.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Ching-Ping Wong^d ; ^e
• 关键词：three dimensional ; RGO frameworks ; mesoporous ; hollow spheres ; lithium storage properties
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：1 June 2016
• 年：2016
• 卷：202
• 期：Complete
• 页码：186-196
• 全文大小：5327 K

文摘

Three-dimensional (3D) reduced graphene oxide (RGO) frameworks confined hollow spherical SnO₂-Fe₂O₃@RGO nano-shells (3D h-SnO₂-Fe₂O₃@RGO) are successfully obtained by hydrothermal reduction of h-SnO₂-Fe₂O₃@GO in graphene oxide (GO) suspension. As anode materials for lithium-ion batteries (LIBs), the novel 3D h-SnO₂-Fe₂O₃@RGO architectures demonstrate great improvement in cycling performance (∼830 mAh g⁻¹ after 100 cycles at 200 mA g⁻¹) and rate capability (∼550 mAh g⁻¹ at 1000 mA g⁻¹for 10 cycles) over that of hollow SnO₂ spheres (h-SnO₂), h-SnO₂-Fe₂O₃, and 3D RGO frameworks wrapped hollow spherical SnO₂@RGO nano-shells (3D h-SnO₂@RGO). The 3D porous frameworks and coating graphene nano-shells serve as efficient electron and ion conductive networks as well as buffer for the large volume variation of hollow SnO₂-Fe₂O₃ during cycling. Moreover, the hollow spherical metal oxide mesoporous nano-shells could enlarge the surface area, retard the volume change, prevent aggregation of nanosized active materials and graphene nanosheets.