High stability graphene oxide aerogel supported ultrafine Fe3O4 particles with superior performance as a Li-ion battery anode

MOF-Derived Long Spindle-like Carbon-Coated Ternary Transition-Metal-Oxide Composite for Lithium Storage

“…The peaks at 285.79 and 288.98 eV are attributed to C–O and O–C=O. 10 , 21 The peak at 530.10 eV of the O 1s spectrum corresponds to (FeCoNi)–O. The binding energies at 531.92 and 533.82 eV are the bonds between carbon- and oxygen-containing groups on the surface of metal oxides, which are C–O, and −O–C=O ( Figure 4 c).…”

“…However, the reconstruction provides new active sites and surfaces, indicating that the surface reactions occur even with higher kinetics, leading to continuous capacity increment in the subsequent cycle. 17 , 21 , 23 After 330 cycles, the reversible specific capacity and CE of (FeCoNi) 3 O 4 @C-700 are ∼653.4 mAh g –1 and 100%, respectively. Under the same conditions, the after-cycling reversible specific capacities of (FeCoNi) 3 O 4 @C-600 and (FeCoNi) 3 O 4 @C-800 are 527.8 and 120.6 mAh g –1 , respectively.…”

Heterogeneous Atoms Substituted Rock Salt Phase Mn1‐xFexO Solid Solution with Rich Defects for Advanced Lithium‐Ion Batteries

“…[ 17 ] The XPS spectra of Fe 2p (Figure 3e) further show that not only the peaks of Fe 2+ ions appear at ≈710.7 and 723.8 eV, but also the peaks of Fe 3+ ions appear at ≈713.9 and 727.2 eV. [ 18 ] The characteristic peaks appearing at ≈718.7 and 732.3 eV are satellite peaks of Fe 2+ ions. [ 18a ] The density of states calculations was also used to give an insight into Fe elements and Vo on the electronic structure of MnO.…”

“…[ 18 ] The characteristic peaks appearing at ≈718.7 and 732.3 eV are satellite peaks of Fe 2+ ions. [ 18a ] The density of states calculations was also used to give an insight into Fe elements and Vo on the electronic structure of MnO. Compared with MnO (Figure 3f), a significant impurity level appears near 0.88 eV in Fe‐MnO model (Figure 3g), which can act as a hopper for the carrier to reduce the activation energy barrier and improve the conductivity of the material.…”

Electrochemical Performance and Mechanism of Surface‐Fluorinated Fe3O4 as Stable Anode for Lithium‐Ion Batteries

“…[ 8 ] Among them, Fe 3 O 4 has attracted considerable attention because of its outstanding specific capacity of ≈926 mAh g −1 , safe lithium intercalation potential, low cost, and environmental friendliness. [ 9 ] However, due to the inherently low electronic/ionic conductivity and drastic changes in volume during cycling, leading to irreversible capacity fading, poor cycling stability, and even safety issues, which hinders further the commercial applications of Fe 3 O 4 electrode. [ 10 ] To address these limitations, several promising strategies have been proposed, such as combining carbon materials to improve electronic conductivity and buffer volume expansion, reducing the size of materials or constructing hollow structures to increase the mass transfer rate and alleviate stress caused by volume expansion, and doping heteroatoms to enhance structural stability.…”