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The Fe7S8 nanoparticles were successfully attached on the carbon networks by a simple freeze drying process followed by the subsequent calcination, forming the Fe7S8@C composite. As anode materials for lithium ion batteries, its reversible capacity can maintain at 667 mAh g−1 at a high current density of 2 A g−1 after 200 cycles. Besides, its sodium storage performance was also investigated, and a...
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