Phase Distribution and Electrochemical Properties of Al-Substituted Nickel Hydroxides
L. J. Yang
X. P. Gao
Q. D. Wu
H. Y. Zhu
G. L. Pan
10.1021/jp0655468.s001
https://acs.figshare.com/articles/journal_contribution/Phase_Distribution_and_Electrochemical_Properties_of_Al_Substituted_Nickel_Hydroxides/3016117
Substituting small contents of aluminum for nickel in nickel hydroxides by a chemical coprecipitation and a
subsequent hydrothermal process can yield stable positive electrode materials. Detailed studies on the structural
evolution were conducted by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission
electron microscopy (TEM). The electrochemical properties of Al-substituted nickel hydroxides in alkaline
solution were examined by charge−discharge experiments and cyclic voltammetric (CV) measurements.
Hydrothermal treatments improved the crystallinity of Al-substituted nickel hydroxides, which exhibited much
better electrode performance than the untreated samples. The sample with 10% (in mol) Al substitution having
a mixture structure with α- and β-phases after hydrothermal treatments showed the maximum discharge capacity
of 333 mAh/g, corresponding to 1.46 exchanged electrons per Ni atom in α-phase nickel hydroxides. The
phase distribution in the mixture has a great influence on the particle morphology, discharge capacity, potential
plateau, and redox potentials of nickel hydroxide electrodes.
2007-03-29 00:00:00
nickel hydroxide electrodes
XRD
TEM
SEM
CV
transmission electron microscopy
discharge capacity
phase