Abstract
SnO2 suffers from the severe pulverization problem when used as an anode material for lithium ion batteries (LIBs). To overcome its drawbacks, hybridizing nanosized SnO2 with carbon-based materials is very impactful, and we herein successfully synthesize ultrasmall SnO2 nanodots (average size of around 5 nm) within the channels of the commercial ordered mesoporous carbon (CMK-3), in which the tin precursor is prefilled under a vacuum and then is easily converted into SnO2 by annealing at 350 °C in air. The as-prepared SnO2@CMK-3 composite demonstrates good lithium storage properties, displaying a discharge capacity of 898.8 mA h/g at the 150th cycle at 500 mA/g, apparently higher than that for the bare SnO2 and CMK-3 electrodes. The superior electrochemical performance of SnO2@CMK-3 can be due to the high conductivity and vast pore volume of the CMK-3 carbon matrices, which efficiently alleviate the volume change induced pulverization and enhance the electrode conductivity. Besides, the uniform distribution of the ultrasmall SnO2 nanodots within CMK-3 maximally enlarges the lithium storage sites and minimizes the effect of the volume variation.
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