In situ synthesis of Fe3O4-reinforced carbon fiber composites as anodes in lithium-ion batteries
2019
Akia, Mandana | Salinas, Nataly | Luna, Salomon | Medina, Elizabeth | Valdez, Alejandra | López, Jorge | Ayala, Jonathan | Alcoutlabi, Mataz | Lozano, Karen
α-Fe₂O₃ hollow nanofibers with wall thicknesses of 45 ± 16 nm were fabricated via centrifugal spinning of a solution containing Fe(NO₃)₃·9H₂O and polyvinylpyrrolidone. These fibers were subjected to mechanical milling and mixed in ethanol. Polyacrylonitrile (PAN) fiber mats were also fabricated by centrifugal spinning from dimethylformamide-based solutions. The as-prepared PAN fibrous mats were dipped in the iron-oxide suspension. The coated PAN membranes were then subjected to a heat treatment which yielded carbon fibers coated with Fe₃O₄ nanoparticles. Both pure carbon fibers (carbonized PAN fibers) and Fe₃O₄/C composite fibers were used as anode materials in Li-ion batteries. The Fe₃O₄/C composite anode exhibited high specific capacity and good cycle stability when compared to that of the carbon-fiber electrode. An initial discharge capacity (Li insertion) of 882 mAh g⁻¹ was obtained for the Fe₃O₄/C composite fibers with promising cycle performance and rate capability. These composite fibers show promising applications as electrode materials in high-performance rechargeable lithium-ion batteries.
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