The Effect of Annealing Temperature on the Synthesis of Nickel Ferrite Films as High-Capacity Anode Materials for Lithium Ion Batteries

Abstract

Anode materials providing a high specific capacity with a high cycling performance are one of the key parameters for lithium ion batteries’ (LIBs) applications. Herein, a high-capacity NiFe2O4(NFO) film anode is prepared by E-beam evaporation, and the effect of the heat treatment is studied on the microstructure and electrochemical properties of LIBs. The NiFe2O4 film annealed at 800 °C (NFO-800) showed a highly crystallized structure and different surface morphologies when compared to the electrode annealed at a lower temperature (NFO-600, NFO-700). In the electrochemical measurements, the high specific capacity (1804 mA g−1) and capacity retention ratio (95%) after 100 cycles were also achieved by the NFO-800 electrode. The main reason for the good electrochemical performance of the NFO-800 electrode is a high structure integrity, which could improve the cycle stability with a high discharge capacity. The NiFe2O4 electrode with an annealing process could be further proposed as an alternative ferrite material.

Tunable Dielectric Properties of Nickel Ferrite Derived via Crystallographic Site Preferential Cation Substitution

“…Nickel ferrite (NiFe 2 O 4 ; NFO) is one of the metal-oxide-based soft magnetic materials owing to its high magnetization at low magnetic fields and low coercive force. , The physical, chemical, and electromagnetic properties of NFO and NFO-based composites are attractive for utilization in numerous scientific and technological applications. − Due to the intrinsic nature of NFO, it has been employed as a suitable active material in a wide range of applications, which include electronic memory, biomedical sensors and actuators, telecommunication, electromagnetic interference (EMI) shielding, catalysis, energy storage, and high-frequency electromagnetic devices. − The recent attention to the intrinsic and doped NFO materials is primarily due to the possibility of the design and development of their nanoscale architectures for utilization in electromagnetics, electrochemical energy storage and conversion technologies, and biomedical applications. − Additionally, using intrinsic or doped NFO in multilayered structures or in conjunction with polymers has been proposed to design highly efficient EMI shielding materials . For instance, the EMI absorber materials designed by means of a multilayer assembly of poly­(vinylidene fluoride)-containing Zn-doped NFO have shown to increase the EMI shielding effectiveness dramatically .…”

“…Therefore, understanding the electrical, magnetic, and dielectric properties of intrinsic and doped NFO nanomaterials warrants further investigations. Furthermore, compared to bulk materials, transition-metal-based engineered nanostructured materials are expected to provide excellent opportunities to tailor and/or manipulate the quantum effects and thereby derive novel electrical, optical, and magnetic properties. − …”