Novel highly conductive ferroferric oxide/porous carbon nanofiber composites prepared by electrospinning as anode materials for high performance Li-ion batteries

Abstract

In this paper, ferroferric oxide (Fe 3 O 4 ) nanoparticles/porous carbon nanofibers 10 (Fe 3 O 4 /PCNFs) composites were successfully fabricated by elctrospinning and subsequent 11 calcinations. The composites were characterized by X-ray diffraction, thermogravimetric 12 analysis, scanning electron microscopy and transmission electron microscopy to analyze the 13 structure, composition and morphology. The electrochemical performance was evaluated by 14 coin-type cells versus metallic lithium. The results indicated that Fe 3 O 4 /PCNFs composites 15 exhibited high reversible capacity and good capacity retention. The discharge capacity 16 maintained 717.2 mA h g -1 at 0.5 A g -1 after 100 cycles. The excellent performances of 17 Fe 3 O 4 /PCNFs composites are attributed to good crystallinity and uniformly dispersive Fe 3 O 4 18 nanoparticles, and porous carbon shell with high conductivity. The carbon coating buffered 19 the tremendous volumetric changes between Fe 3 O 4 nanoparticles and Fe atoms in the 20 charge/discharge processes and kept the structure integrity of Fe 3 O 4 nanoparticles. Porous 21 carbon nanofibers prepared by unique calcination process improved the conductivity of 22 composites and provided free space for migration of lithium ions. The preparation of strategy 23 is expected to be applied to the preparation of other transition metal oxides materials as 24

Metal–Organic Gel‐Derived FexOy/Nitrogen‐Doped Carbon Films for Enhanced Lithium Storage

“…As revealed by XPS analyses, the intensive peaks at ≈285, 399, 531, and 710–725 eV undoubtedly correspond to the C 1s, N 1s, O 1s, and Fe 2p, respectively, indicating the existence of above elements (Figure b) . In high‐resolution spectrum, the two wide‐range main peaks of Fe 2p could be fitted well with Fe 2 O 3 and Fe 3 O 4 (Figure c) . The sub‐spectra of Fe 2p exhibit peaks at 710.4 and 723.6 eV, which are attributed to Fe 2p3/2 and Fe 2p1/2 of Fe 2+ .…”

Highly uniform Fe3O4 nanoparticle–rGO composites as anode materials for high performance lithium-ion batteries

“…The peak at about 0.19 V corresponds to the extraction of lithium ions from graphitized carbon, and the anodic peak at about 1.22 V corresponds to the irreversible reaction with the electrolyte. 24 The electrochemical resistances for cells with Fe 3 O 4 , Fe 3 O 4 / rGO-180 and Fe 3 O 4 /rGO were monitored aer one chargedischarge cycle at 0.5 A g À1 , as shown in Fig. 5d.…”

“…However, common iron oxides oen undergo large volume changes (193% for Fe 2 O 3 , calculated from the densities of Fe 2 O 3 , Fe and Li 2 O) based on their electrochemical reactions in the charging-discharging process, 12,13 which can cause crushing of the crystal and aggregation of particles and lead to almost constantly falling capacity decay during the initial few cycles. Fortunately, the electrochemical performance can be effectively improved by combining iron oxides with conducting materials 14 such as reduced graphene oxide (rGO), [15][16][17][18] carbon, [19][20][21][22] carbon nanobers (CNFs), 23,24 carbon nanotubes, 25,26 and conductive polymers. 27,28 Coating carbon materials or conductive polymers can x the locations of iron oxides in the composite electrode, buffer the volume expansion and shrinkage, and retain the integrity of the crystal structures.…”

A Review of Recent Advancements in Electrospun Anode Materials to Improve Rechargeable Lithium Battery Performance

“…Electrospinning and subsequent thermal treatment of a metal oxide and carbon precursor is the simplest technique to prepare the transition metal oxide/carbon composite anode material. Many phases of the transition metal oxides, such as Fe 3 O 4 [ 107 , 108 , 133 , 134 , 135 ], Fe 2 O 3 [ 111 , 126 ], Co 3 O 4 [ 109 , 118 , 129 ], and CoO [ 136 ], were composited with carbon nanofibers. Figure 10 a shows the Co 3 O 4 porous carbon nanofiber synthesis process and the resulting product [ 109 ].…”