Abstract
The development of E-textiles requires portable devices for energy storage that do not compromise the comfort and functionality of the textile. In this work, a flexible carbon electrode, obtained by impregnation of magnetite nanoparticles (Fe3O4-NPs) on electrospinning carbon nanofibers (CNFs), was developed as a negative electrode for lithium batteries. The active anodic material was characterized by Raman spectroscopy, thermogravimetric analyses (TGA), transmission electron microscopy (TEM) and electrochemical techniques. TEM images showed that Fe3O4-NPs particles, 32 nm in size, are well adsorbed on ~400 nm CNFs. The electrochemical tests indicate that the presence of Fe3O4-NPs improves the electrochemical performance of the CNFs, achieving an initial high discharge capacity of 1146 mAh g−1, superior to that exhibited for pure CNFs (480 mAh g−1). Also, higher coulombic efficiency (90%) was exhibited by the composite active material. However, a slight reduction of capacity retention at high C-rates was observed in the composite due to the lower electronic conductivity of Fe3O4-NPs.
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