Abstract:

Using Ni(NO₃)₂·6H₂O and FeCl₃·6H₂O mixed hydrothermal method, we synthesized nanometer NiFe₂O₄ powders, and characterized the samples by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Meanwhile, in order to evaluate the stability of product, we tested the samples for charge and discharge cycle. The experimental results show that the nanometer NiFe₂O₄ power is spherical quasi\|crystal structure, high degree of crystallinity, crystalline intact and uniform particle size distribution; the 1st,30th,50th,70th specific capacity of the charge and discharge are （997,1 019）,(726,750.2),(560.9,578.4),(514.8,528.2)(mA·h)/g, which show that NiFe₂O₄ has good electrochemical stability.

Key words: NiFe₂O₄, hydrothermal method, microelectronic system, electrochemical stability