A facile and cost-effective urea-assisted autocombustion strategy has been designed for the fabrication of Co 3 O 4 /CoFe 2 O 4 nanocomposite and pure CoFe 2 O 4 anode materials followed by annealing at 700 and 900 °C for 6 h, respectively. To confirm the exact structure, Rietiveld analysis was performed on the Synchrotron XRD pattern of both the CoFe 2 O 4 samples annealed at 700 and 900 °C. The results clearly depicts the formation of two phases (Co 3 O 4 :CoFe 2 O 4 ) with the ratio of [76.3(5):23.6(3)%] in the sample annealed at 700 °C sample, while single phase CoFe 2 O 4 formation was observed for the sample annealed at 900 °C. It has also been found that the designed nanocomposite sample is composed of small nanoparticles (50−100 nm), while the size of pure CoFe 2 O 4 particles is in the range from 600 nm to 1 μm. When applied as an anode material, the obtained Co 3 O 4 /CoFe 2 O 4 nanocomposite electrode exhibits high reversible capacity as well as excellent cycling stability and better rate capability in comparison to a pure CoFe 2 O 4 electrode. The enhanced electrochemical performance of the nanocomposite can be attributed to the intimate interconnection between Co 3 O 4 and CoFe 2 O 4 , along with the nanosize range of particles and high surface area, which not only favor fast kinetic properties facilitating electron transportation and Li + ion insertion/deinsertion but also relieve the stress caused by volume changes during the numerous charge/discharge cycles and suppress the degradation of the material.
Hierarchical meso-/macroporous anatase TiO2 was synthesized by the hydrolysis of a titanium metal-organic framework precursor followed by calcination in air. This unique porous feature enables the superior rate capability and excellent cycling stability of anatase TiO2 as an anode for rechargeable lithium-ion batteries.
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