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With a theoretical capacity of 847 mAh g−1, Sn has emerged as promising anode material for sodium‐ion batteries (SIBs). However, enormous volume expansion and agglomeration of nano Sn lead to low Coulombic efficiency and poor cycling stability. Herein, an intermetallic FeSn2 layer is designed via thermal reduction of polymer‐Fe2O3 coated hollow SnO2 spheres to construct a yolk‐shell structured Sn/FeSn...
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