标题：Binderless, bendable graphene/FexSn1-xO2 anode for lithium-ion batteries without the necessity of a current collector
作者：Zhang, Xueqian ;Huang, Xiaoxiao ;Liu, Dongdong ;Hoang, Tuan K.A. ;Geng, Xin ;Chen, Pu ;Zhang, Xiaodong ;Wen, Guangwu
作者机构：[Zhang, Xueqian ;Huang, Xiaoxiao ;Liu, Dongdong ;Geng, Xin ;Zhang, Xiaodong ] School of Materials Science and Engineering, Harbin Institute of Technol 更多
来源：International Journal of Hydrogen Energy
摘要：SnO2 is an appealing anode material for lithium ion batteries. Advantages of SnO2 includes relatively low charge-discharge plateau and highly abundance in nature. However, the volume change (300%) is significant and critically impeding its cycle life. In this manuscript, we address these problems by exploiting an in-situ redox process to prepare graphene encapsulated SnO2 nanoparticles using soluble Sn2+ as the Sn precursor, which is oxidized to SnO2 by using graphene oxide. This method affords graphene @ SnO2 via oxygen bridging through of SnO2 nanoparticles. Furthermore, this method incorporates Fe atom into the SnO2 structure in-situ to create FexSn1-xO2 structure, which exhibits higher Li storage capacity. Our synthetic approach delivers graphene encapsulated FexSn1-xO2 structure, which is located on flexible carbonaceous fibers, and the whole system can be applied as lithium-ion batteries anode without any need of a current collector or binder polymer. This novel Sn based electrode could deliver a high capacity (calculate total electrode mass) of 454.3 mAh g−1 after 200 cycles at 100 mA g−1 (65.1% retention). Unlike most contemporary technologies, increasing the thickness of our Sn based electrode simply increases the capacity proportionally. The areal capacity is 1348.3 μAh cm−2, and it is simply doubled to 2856.1 μAh cm−2 while we double the thickness of electrode.
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