Nitrogen-doped carbon-coated Ti–Fe–O nanocomposites with enhanced reversible capacity and rate capability for high-performance lithium-ion batteries

Abstract

Rationally designed composite materials could give full play to the performance superiority of each component. In this work, we designed and fabricated Ti−Fe−O nanocomposites coated with nitrogen-doped carbon to act as anode materials for lithium-ion batteries, in which the components of Fe 3 O 4 and FeTiO 3 provide high capacity, a small fraction of TiO 2 improves the cycling stability, and the nitrogen-doped carbon coating not only enhances electronic conductivity but also alleviates the agglomeration and accommodates the volume change during cycling. The electrochemical performance associates greatly with the Ti/Fe molar ratio in the products, and the composite with a ratio of 1:2 exhibits the best cycling performance (reversible capacities of 426.4 mAh g −1 at 100 mA g −1 and 321.7 mAh g −1 after cycling 500 times at 500 mA g −1 ) as well as outstanding rate capabilities (374.1, 347.5, 315.9 and 260.3 mAh g −1 at 200, 400, 800, and 1600 mA g −1 , respectively). The combined merits of various components endow the nanocomposite with enhanced cycling and rate performance with respect to the carbon-coated TiO 2 and Fe 3 O 4 /FeTiO 3 counterparts prepared under the analogous conditions.

Ilmenite Nanotubes for High Stability and High Rate Sodium-Ion Battery Anodes

“…The ilmenite has a high reserve exceeding 680 million tons in the world and a low price (the peak price was 250–350 USD/metric ton and in 2004–2008 only 80–107 USD/metric ton) . Besides, ilmenite FeTiO 3 belongs to the ABO 3 -type structure with both Fe and Ti ions of approximately equal sizes, and such bimetal oxides that contain two metal elements have great potential to possess excellent performance of ion storage properties, catalytic activity, or gas sensors. − Considering these available values, herein, we put forward a compelling case for application of ilmenite FeTiO 3 in todays energy storage devices, such as SIBs. However, there is seldom research work on ilmenite FeTiO 3 applied as an anode material for SIBs, which may be due to the poor electrochemical performance of bulk FeTiO 3 and the nonflexible structure control of such complex ilmenite oxides.…”

Novel Construction of Heterostructured FeTiO3/Fe2.75Ti0.25O4 Mesoporous Nanodisks with Both High Capacity and Stable Cycling Life for Lithium-Ion Storage

“…Furthermore, the Fe–Ti–O:1 electrode could exhibit a capacity of 478 mA h g –1 at a high rate of 1 A g –1 after 600 cycles, with 94.3% capacity retention. The cycling stability of the designed mesoporous FeTiO 3 /Fe 2.75 Ti 0.25 O 4 composite is also better than that of other MTiO 3 -based composites (Figure b), such as TiO 2 –Fe 2 O 3 @C, FeTiO 3 /Fe/C, TiO 2 –Fe 3 O 4 –FeTiO 3 , NiTiO 3 @G, and CoTiO 3 @G. ,,,− Our Fe–Ti–O:1 electrode exhibits relatively high capacity retention with long cycle life at high current density.…”

Realizing High-Performance Lithium Storage by Fabricating FeTiO3 Nanoparticle-Impregnated Multichannel Carbon Nanofibers with Promoted Reaction Kinetics

“…Therefore, compared with other MTiO 3 (M = Mn, Fe, Ni) anode materials reported in the literature, this NF-FTO self-supporting electrode exhibits favorable electrochemical properties, such as high reversible capacity, extraordinary rate performance, and long-cycle stability (Figure S13 and Table S1). ,,,− …”

“…Recently, transition metal titanates, such as ilmenite FeTiO 3 , have drawn considerable attention because of their high theoretical capacity compared to that of common titanium-based anodes (TiO 2 , Li 4 Ti 5 O 12 ) resulting from the reduction reaction of Fe and a smaller volume change than transition metal oxides (Fe 3 O 4 , NiO). − In addition, the mineral ilmenite is abundant in the earth’s crust and has characteristics of low toxicity and environmental friendliness. − Unfortunately, the drawbacks of low electronic conductivity and non-negligible volume change as a conversion-type anode limit its electrochemical performances in LIBs. To address these issues, Liu et al fabricated FeTiO 3 /C hybrid nanotubes by a sol–gel route, showing an enhanced rate performance of 251 mAh g –1 at 6 A g –1 , but the cycling ability at high current density was not good (163.8 mAh g –1 after 1000 cycles at 5 A g –1 ) .…”