Facile Mechanochemical Synthesis of Nano SnO2/Graphene Composite from Coarse Metallic Sn and Graphite Oxide: An Outstanding Anode Material for Lithium‐Ion Batteries |
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| Authors: | Fei Ye Bote Zhao Prof. Ran Ran Prof. Zongping Shao |
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| Affiliation: | 1. State Key Laboratory of Materials‐Oriented Chemical Engineering, Nanjing University of Technology, Nanjing 210009 (China), Fax: (+86)?25‐8317‐2256;2. College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009 (China);3. College of Energy, Nanjing University of Technology, Nanjing 210009 (China) |
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| Abstract: | A facile method for the large‐scale synthesis of SnO2 nanocrystal/graphene composites by using coarse metallic Sn particles and cheap graphite oxide (GO) as raw materials is demonstrated. This method uses simple ball milling to realize a mechanochemical reaction between Sn particles and GO. After the reaction, the initial coarse Sn particles with sizes of 3–30 μm are converted to SnO2 nanocrystals (approximately 4 nm) while GO is reduced to graphene. Composite with different grinding times (1 h 20 min, 2 h 20 min or 8 h 20 min, abbreviated to 1, 2 or 8 h below) and raw material ratios (Sn:GO, 1:2, 1:1, 2:1, w/w) are investigated by X‐ray diffraction, X‐ray photoelectron spectroscopy, field‐emission scanning electron microscopy and transmission electron microscopy. The as‐prepared SnO2/graphene composite with a grinding time of 8 h and raw material ratio of 1:1 forms micrometer‐sized architected chips composed of composite sheets, and demonstrates a high tap density of 1.53 g cm?3. By using such composites as anode material for LIBs, a high specific capacity of 891 mA h g?1 is achieved even after 50 cycles at 100 mA g?1. |
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| Keywords: | graphene lithium‐ion batteries nanostructures oxides tin |
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