Preparation and Electrochemical Properties of Pomegranate-Shaped Fe2O3/C Anodes for Li-ion Batteries

Abstract

Due to the severe volume expansion and poor cycle stability, transition metal oxide anode is still not meeting the commercial utilization. We herein demonstrate the synthetic method of core-shell pomegranate-shaped Fe2O3/C nano-composite via one-step hydrothermal process for the first time. The electrochemical performances were measured as anode material for Li-ion batteries. It exhibits excellent cycling performance, which sustains 705 mAh g−1 reversible capacities after 100 cycles at 100 mA g−1. The anodes also showed good rate stability with discharge capacities of 480 mAh g−1 when cycling at a rate of 2000 mA g−1. The excellent Li storage properties can be attributed to the unique core-shell pomegranate structure, which can not only ensure good electrical conductivity for active Fe2O3, but also accommodate huge volume change during cycles as well as facilitate the fast diffusion of Li ion.

High Performance Photorechargeable Li‐Ion Batteries Based on Nanoporous Fe2O3 Photocathodes

“…The cyclic voltammetry (CV) measurements were recorded for a voltage range of 0.01-3.0 V (vs Li/Li + ) at 1 mV s −1 scan rate to examine the redox activities of Fe 2 O 3 NRs during lithiation and delithiation. The CV plot has shown similar oxidation and reduction current peaks which match well with the previous reports where the unannealed Fe 2 O 3 is used as an anode [53,54] (Figure 3a). The CV scan has shown a cathodic peak at 0.73 V which corresponds to the reduction of Fe 3+ to Fe 0 and a broad anodic peak at 1.75 V which is referred as the oxidation of Fe 0 to Fe 3+ .…”

Temperature-Driven Synthesis of 1D Fe2O3@3D Graphene Composite Applies as Anode of Lithium-Ion Batteries

“…A near 100% Coulombic efficiency and much higher reversible capacity than Fe 2 O 3 -150 during cycling indicate that the utilization of 3DG can establish an efficient conductive network and mitigate the impact caused by the volume fluctuations of Fe 2 O 3 during the lithiation/delithiation process, which improves cycling stability. The cycling performance of Fe 2 O 3 @3DG-150 is better than many previous similar works, summarized in Table 1 [11,14,34,[43][44][45][46][47][48][49]. However, the Fe 2 O 3 @3DG-120 and Fe 2 O 3 @3DG-180 demonstrate lower specific capacity of 789 and 414 mAh g −1 after 100 cycles at 0.1 A g −1 , while maintaining capacity retention rates of 75.0% and 52.3%, respectively.…”

“…Among TMOs, Fe 2 O 3 has a high theoretical capacity (1007 mAh g −1 ) and a safe lithiation potential (about 1 V vs. Li/Li + ), making it a potential substitute for high-performance anode material [7][8][9]. However, its large volume expansion and low electron transport rate leads to quick capacity loss and inferior rate performance in long-term operation [10][11][12]. Recently, it was discovered that electrochemical properties of Fe-based oxide anode can be enhanced when hybridized with graphene.…”

Carbon-Coated Three-Dimensional MXene/Iron Selenide Ball with Core–Shell Structure for High-Performance Potassium-Ion Batteries

“…The CV data of FeSe x /MB showed similar tendencies to those of FeSe x C/MB, but the peaks were more apparent than in the case of FeSe x @C/MB, owing to the formation of larger FeSe x crystals in the absence of carbon. On the other hand, CV-shaped FeSe 2 –Fe 2 O 3 microspheres exhibited slightly different trends from those of FeSe x @C/MB and FeSe x @C, featuring a peak at 0.66 V, which corresponded to the conversion reaction of Fe 2 O 3 [ 56 , 57 ]. In addition, the area of the CV curve for the FeSe 2 –Fe 2 O 3 microspheres was smaller than those for FeSe x @C/MB and FeSe x /MB, implying a lower specific capacity of the FeSe 2 –Fe 2 O 3 microspheres.…”