Carbon-coated Fe2O3 hollow sea urchin nanostructures as high-performance anode materials for lithium-ion battery

Abstract

Fe 2 O 3 has become a promising anode material in lithium-ion batteries (LIBs) in light of its low cost, high theoretical capacity (1007 mA h g −1) and abundant reserves on the earth. Nevertheless, the practical application of Fe 2 O 3 as the anode material in LIBs is greatly hindered by several severe issues, such as drastic capacity falloff, short cyclic life and huge volume change during the charge/discharge process. To tackle these limitations, carbon-coated Fe 2 O 3 (Fe 2 O 3 @MOFC) composites with a hollow sea urchin nanostructure were prepared by an effective and controllable morphology-inherited strategy. Metal-organic framework (MOF)-coated FeOOH (FeOOH@-MIL-100(Fe)) was applied as the precursor and self-sacrificial template. During annealing, the outer MOF layer protected the structure of inner Fe 2 O 3 from collapsing and converted to a carbon coating layer in situ. When applied as anode materials in LIBs, Fe 2 O 3 @MOFC composites showed an initial discharge capacity of 1366.9 mA h g −1 and a capacity preservation of 1551.3 mA h g −1 after 200 cycles at a current density of 0.1 A g −1. When increasing the current density to 1 A g −1 , a reversible and high capacity of 1208.6 mA h g −1 was obtained. The enhanced electrochemical performance was attributed to the MOF-derived carbon coating layers and the unique hollow sea urchin nanostructures. They mitigated the effects of volume expansion, increased the lithium-ion mobility of electrode, and stabilized the as-formed solid electrolyte interphase films.

Core–Shell Structured C@SiO2 Hollow Spheres Decorated with Nickel Nanoparticles as Anode Materials for Lithium‐Ion Batteries

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Especially, LIBs have been employed as the storage units to build power stations, by means of storing electrochemical energy converted from the intermittently green and sustainable energy (e.g., solar and wind energy). [8][9][10][11][12][13][14][15] Up to now, LIBs are dominating the energy systems because of their high energy densities, light weight, and good durability. However, the commercial anode material, graphite, exhibits a theoretical specific capacity of 372 mAh g −1 , hindering the large-scale applications of next-generation LIBs that combine high energy and high power.

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Recent advances in Fe-based metal–organic framework derivatives for battery applications

“…Feng et al functionalized FeOOH nanoparticles with mercaptoacetic acid (MAA) and reacted them with FeCl 3 ·6H 2 O ethanol solution as well as benzene-1,3,5-tricarboxylic acid (H 3 BTC) ethanol solution to obtain FeOOH@MIL-100(Fe). 77 Subsequently, FeOOH@MIL-100(Fe) was used as a self-sacrificing template to be annealed at 600 °C in an argon atmosphere to obtain carbon-coated Fe 2 O 3 @MOFC with hollow sea urchin nanostructures. As the outer MOF plays a protective role in the pyrolysis process, the inner Fe 2 O 3 remains intact.…”

Enhancing the reversible capacity and cycle stability of lithium-ion batteries with Li-compensation material Li6CoO4

“…As a conventional anode material, graphite is used in commercial lithium-ion batteries. However, the theoretical specific capacity of graphite is low (372 mA h g −1 ), which cannot meet the increasing demand for high energy density [6][7][8]. Meanwhile, silicon anode possesses a theoretical capacity of 4200 mA h g −1 , which is ten times larger than that of graphite [9][10][11].…”