Abstract
A novel spherical Sn/SnO2/porous carbon composite anode material was successfully synthesized from activated mesocarbon microbeads (AMCMBs) and SnCl4·5H2O as starting materials by a simple hydrothermal method followed by heat treatment. SnO2 dispersed on AMCMB was partially reduced into metallic Sn favorable for high capacity. The structure, morphology, and electrochemical properties have been studied by x-ray diffraction, scanning electron microscopy, and electrochemical performance test. The results show the porous AMCMB as a supporting matrix surface supports the huge volume expansion and keeps the structural stability of Sn/SnO2 during the insertion/extraction process of lithium ion. The Sn/SnO2/AMCMB sample annealed at 600 °C takes full advantages of the superiorities of porous carbon, SnO2, and metallic Sn and exhibits an excellent cycling performance and rate capability. The specific capacity is 451 mAh g−1 at a current density of 100 mA g−1 after 50 cycles. The Sn/SnO2/AMCMB composite has a large potential application as a high-performance anode material for the lithium-ion batteries.
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