Pine‐Leaf‐Shaped α‐Fe₂O₃ Micro/Nanostructures with a Preferred Orientation along the (110) Plane for Efficient Reversible Lithium Storage

Abstract

Pine‐leaf‐like α‐Fe2O3 micro/nanostructures with (110)‐facet orientations are prepared by a hydrothermal process using Mg2+ as an inducer and are investigated as conversion‐type anode materials for lithium‐ion batteries (LIBs). The unique micro/nanostructured building blocks significantly shorten the diffusion distance for lithium ions and improve the kinetics of the lithium ion extraction/insertion process, and the unique hierarchical morphology provide buffer space for the volume change of the electrode during the charge–discharge processes. Thus, favorable performances for lithium storage are demonstrated for the micro/nanostructured α‐Fe2O3 electrodes. In addition, the facet orientation of the particles is also found to have a substantial impact on the electrode performance, and the growth of the micro/nanoparticles in a preferred orientation along the (110) plane facilitated the anisotropic diffusion of lithium ions along channels in the [1true1‾ 00] direction. From the dual benefits of the stable hierarchical micro/nanostructure and the preferred growth of the particles along the (110) plane, excellent electrochemical performance with a reversible capacity of up to 915 and 565 mA h g−1 at rates of 100 and 5000 mA g−1, respectively, and a capacity retention of 690 mA h g−1 at 1000 mA g−1 after 200 cycles is demonstrated for the α‐Fe2O3 micro/nanostructure prepared under optimized conditions.

Polyaniline Coated Core-Shell Typed Stimuli-Responsive Microspheres and Their Electrorheology

“…Ferric oxide (Fe 2 O 3 ) has been studied extensively in many applications, such as photocatalysis [ 87 , 88 ], wastewater treatment [ 89 ], biomedical [ 90 ], microwave absorption [ 91 ], sensors [ 92 ], and lithium-ion battery anodes [ 93 ]. A variety of Fe 2 O 3 structures, such as cube-shaped [ 94 ], rod-shaped [ 95 ], pine-leaf-shaped [ 96 ], and flower-like [ 97 ], have been fabricated successfully by different steps. Flower-like Fe 2 O 3 has attracted considerable attention because of its special structure.…”

Facile Fabrication of Fe2O3 Nanoparticles Anchored on Carbon Nanotubes as High‐Performance Anode for Lithium‐Ion Batteries

“…Amongst these transition metal oxides, Fe 2 O 3 is considered as an attractive candidate due to its high theoretical capacity (1007 mAh g −1 ), low cost and environmental benignity . However, the lithium storage mechanism of Fe 2 O 3 is an electrochemical conversion process, which leads to drastic volume variation, pulverization of the electrode, and thus poor cycling stability . In addition, the low electronic conductivity of Fe 2 O 3 induces additional performance degradation, especially at high current densities .…”

Revealing the Excellent Low-Temperature Activity of the Fe1–xCexOδ-S Catalyst for NH3-SCR: Improvement of the Lattice Oxygen Mobility

“…However, compared with Fe 2 O 3 -S, the peak strength corresponding to each crystal plane in the Fe 0.91 Ce 0.09 O δ -S catalyst was significantly reduced, indicating that Ce increased the disorder of the α-Fe 2 O 3 crystal and reduced the crystallinity. At the same time, it can be seen from Figure S7 that the intensity of the (1 1 0) peak in the Fe 0.91 Ce 0.09 O δ -S catalyst was stronger than that of the main peak (1 0 4), indicating that Ce induced the oriented growth of α-Fe 2 O 3 and resulted in the dominant exposure of the (1 1 0) crystal plane. − With an increase of the Ce content, the disorder degree of the α-Fe 2 O 3 phase in Fe 0.79 Ce 0.21 O δ -S further increased, and the CeO 2 phase began to appear. The α-Fe 2 O 3 phase in the Fe 1– x Ce x O δ -S ( x = 0.21, 0.33, and 0.50) catalysts disappeared completely, indicating that α-Fe 2 O 3 changed to the amorphous state and iron–cerium composite oxide was formed.…”