Abstract
A two-step approach using co-precipitation and thermal reduction treatment strategy is adopted to synthesize Sn/FeSn2/[email protected] carbon yolk-shell nanocubes with multi-phase nanocores for highly stable anode materials in lithium-ion battery. In the novel yolk-shell nanostructure, the multi-phase nanocores consist of Sn, FeSn2 and FeO nanoparticles while the shell is made of amorphous nitrogen-doped carbon. With the synergy of multi-phase nanocores, the confining effect of the carbon shell and the in-depth nanocrystallization of Sn/FeSn2/FeO nanocores in the yolk-shell nanostructures, Sn/FeSn2/[email protected] nanocomposites exhibit high capacity of 601 mAh g−1 at 0.1 Ag−1 after the 300th cycle and capacity of 484 mAh g−1 at 0.5 Ag−1 after the 600th cycle. Our work suggests that high-performance battery materials can be produced by rational structure engineering of multi-phase nanocomposites.
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