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Keywords:

  • anodes;
  • batteries;
  • yolk–shell architecture;
  • energy conversion;
  • Fe3O4
Thumbnail image of graphical abstract

Good egg: A unique yolk–shell Fe3O4@C composite with high loading ratio of 90 wt % has been prepared (see figure). As an anode material for lithium-ion batteries, this composite exhibits a high capacity of 680 mAh g−1 even at a large current density of 5 A g−1, and makes it a promising anode material for next-generation lithium-ion batteries.