Graphitic Carbon-Doped Mesoporous Fe₂O₃ Nanoparticles for Long-Life Li-Ion Anodes

Abstract

Biomass carbon-coated and pseudocapacitance-assisted α-Fe2O3 has recently gained more attention for enhanced lithium storage performance. Herein, we used a waste poplar branch as a biotemplate and a carbon source to prepare graphitic-C-doped mesoporous α-Fe2O3 (α-Fe2O3/C) through a simple immersion–carbonization–calcination method. The influence of carbon content on both the microstructures and electrochemical properties was also studied. The product calcined in air at 400 °C (Fe2O3/C400) presents a hierarchically tubular structure with cross-linkage of 18% graphitic-C and α-Fe2O3 nanoparticles with an average size of ∼28 nm. Meanwhile, the Fe2O3/C400 nanomaterial exhibits a large surface area of 114 m2 g–1 and mesopore size distribution centered at 2 nm. As lithium-ion battery anode material, such a unique hierarchical structure presents a certain pseudocapacitance behavior, thus improving its lithium storage performance. Electrochemical measurements show that the Fe2O3/C400 nanomaterial exhibits higher specific capacity and better rate performance. Especially, it can retain a capacity of 885 mA h g–1 at 1 A g–1 after cycling 1400 times, indicating good capacity retention and long-cycling stability. The good electrochemical performance mainly originates from the synergism of the unique microstructure of the Fe2O3/C400 nanomaterial, suitable doping of graphitic-C, and certain pseudocapacitance behavior. Thus, the low-cost bifunctional biotemplate strategy can provide a useful experience for the massive synthesis of pseudocapacitance-assisted high-performance anodes.

Insights in Utilizing NiCo2O4/Co3O4 Nanowires as Anode Material in Lithium‐Ion Batteries

“…It is worth mentioning that both the electrodes have first serious capacity decay until nearly 75 cycles and thereafter the capacity started increasing. It is believed that the obtained behavior is due to the formation of SEI film on the electrode surfaces, which restricts the Li + ions extraction from the electrode to the electrolyte along with the mechanical deterioration owing to the volume changes [37] . Notably, the Coulombic efficiency of both the electrodes of pure NiCo 2 O 4 and NiCo 2 O 4 /Co 3 O 4 also shows a slight decrease in the same range of cycle numbers, certifying the capacity decay in the electrode materials.…”

“…It is believed that the obtained behavior is due to the formation of SEI film on the electrode surfaces, which restricts the Li + ions extraction from the electrode to the electrolyte along with the mechanical deterioration owing to the volume changes. [37] Notably, the Coulombic efficiency of both the electrodes of pure NiCo 2 O 4 and NiCo 2 O 4 /Co 3 O 4 also shows a slight decrease in the same range of cycle numbers, certifying the capacity decay in the electrode materials. Thereafter, the charge capacity of both electrodes gradually started increasing in the further cycles, which can be ascribed to the activation process in the electrode materials as the SEI is also more effective in passivating the active materials.…”

“…[3][4][5][6] Recently, transition metal oxides, using metals such as Fe, Mn, Ni, Co, Cr, etc., have been actively proposed as a replacement for the graphite anode due to the various advantages for example their high theoretical specific capacity (> 500 mAh g À 1 ), excellent electrochemical properties, diverse morphological characteristics, and reversible redox reaction, high abundance, low cost, and environmental friendliness. [7][8][9][10][11][12][13] Furthermore, the research interest in this field continued with ternary transition metal oxides due to their distinctive chemical component, abundant active sites, synergistic combination of various metals, and high redox activity. [14][15][16] In addition, a partial replacement of binary oxides by suitable transition metal ions opens the class of ternary oxides.…”

A single-crystalline Co3O4 nanoparticle-assembled three-dimensional chain as an ultra-stable magnesium-ion battery cathode at different temperatures

“…Under the conditions of high temperature, several nanomaterials are active, enabling a relatively high capacity; nevertheless, electrolyte degradation would lead to severe capacity decay. 25,26 The rate-performances at 45 °C and −5 °C are presented in Fig. 4c and d.…”

Properties of silicon-based lithium batteries with different electrode nanostructures

“…graphitic-C-doped mesoporousα-Fe 2 O 3 ,whcih demonstrates a large surface area of 114 m2 g-1, with higher capacity and long cycle life. [2] Nanomaterials have unique structures and properties, and their application to lithium ion batteries can significantly improve their performance. For example, Zhu and his group synthesis a hierarchically structured three-dimension graphene nanostructure consist of perpendicularly arranged porous graphene nanosheets and PHG interconnected nanocages through a CVD method.…”