High cycling stability of anodes for lithium-ion batteries based on Fe3O4 nanoparticles and poly(acrylic acid) binder

Synthesis and Characterization of Vanillin‐Templated Fe2O3 Nanoparticles as a Sustainable Anode Material for Li‐Ion Batteries

“…The resistance related to SEI undergoes a minor but continuous increase. This confirms the well‐known evolution of a partly reversible passivation layer when electrodes embedding dispersed nanoparticles of metals, here formed during conversion, undergo prolonged cycling . On the other side, the charge‐transfer resistance exhibits a relative stabilization after 100 cycles.…”

“…The very good rate performance shown in Figure can be related to a synergistic interplay of the regular and porous morphology of the vanillin‐templated nanoparticles with the stabilizing effect of the poly(acrylic acid) binder. In fact the latter, thanks to the possibility of strong electrostatic interactions between metal nanoparticles and carboxylic groups, is commonly beneficial for mechanical and morphological stabilization of anodes prone to volume changes, such as Si or other iron oxides, as previously reported ,. In order to further investigate the very good high‐rate performances, FeVan nanoparticles were also subjected to prolonged cycling at high currents (1000 mA g −1 and 2000 mA g −1 ).…”

Effect of Continuous Capacity Rising Performed by FeS/Fe3C/C Composite Electrodes for Lithium‐Ion Batteries

“…R CT of the FeS/Fe 3 C/C electrode slightly decreases in lithiation conditions upon cycling, and the R CT value remains almost stable in delithiation conditions. The rapid charge‐transfer kinetics of FeS/Fe 3 C/C may benefit from a partial nanoparticle reaggregation, which mostly occurs during the initial cycles (Figure c) whereas the morphology appears stabilized upon further cycling . In contrast, R CT of the FeS electrode sharply increases until the 100th cycle, corresponding to the terrible capacity decay (Figure d); in subsequent cycles, R CT of the FeS electrode continuously declines but is still higher than that of the FeS/Fe 3 C/C electrode in lithiation conditions.…”

“…The rapid charge-transfer kinetics of FeS/Fe 3 C/C may benefit from ap artial nanoparticle reaggregation, which mostly occurs during the initial cycles ( Figure 8c)w hereas the morphology appears stabilized upon furtherc ycling. [47] In contrast, R CT of the FeS electrode sharply increases until the 100th cycle, corresponding to the terrible capacity decay (Figure 4d); in subsequent cycles, R CT of the FeS electrode continuously declines but is still highert han that of the FeS/Fe 3 C/C electrode in lithiation conditions. In summary,t he interconnected carbon ball morphology can improveL i + /electron mobility and form a better protective SEI layer,t hus promoting the redox reaction.…”

Growth Condition Dependent Magnetic Properties of CoFe₂O₄ Nanoparticles and Their Highly T₂ Weighted Contrast in MRI

“…Magnetic nanoparticles (such as Fe 3 O 4 , CoFe 2 O 4 , NiFe 2 O 4 and γ-Fe 2 O 3 ) have been investigated widely in recent years owing to their unique properties and a great potential application in magnetic resonance imaging (MRI) [1][2][3][4], hyperthermia [5,6], drug delivery [7,8], catalyst [9,10] and Li ion battery [11,12] etc.. Specially, they were extensively studied as a contrast agent in MRI.…”