Effect of Al Substitution on the Microstructure and Lithium Storage Performance of Nickel Hydroxide,
writer：Yanwei Li*, Guanlin Pan, Wenqiang Xu, Jinhuan Yao*, Lingzhi Zhang.
keywords：氫氧化鎳；鋰離子電池
source：期刊
specific source：Journal of Power Sources, 2016, 307: 114–121.
Issue time：2018年
Al-substituted Ni(OH)2 samples with Al3t/Ni2t mole ratio of 0%, 10% and 20% have been prepared by a
very facile chemical co-precipitation method. The microstructure of the prepared samples are analyzed
by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermo-gravimetric analysis
(TGA), and Field emission scanning electron microscopy (FESEM). The results reveal that the pure
Ni(OH)2 sample is b-Ni(OH)2 with nanosheets hierarchical structure; the sample with 10% Al is mixed
phase a/b-Ni(OH)2 with hybrid nanosheets/nanoparticles hierarchical structure; the sample with 20% Al
is a-Ni(OH)2 with irregular nanoparticles hierarchical structure. The lithium storage performances of the
prepared samples are characterized by cyclic voltammograms (CV), electrochemical impedance spectroscopy
(EIS), and chargeedischarge tests. The results demonstrate that Al substitution could improve
the lithium storage performances of nickel hydroxide. In particular, the mixed phase a/b-Ni(OH)2 with
10% Al exhibited the highest electrochemical activity, the best rate performance, and superior cycling
stability. For example, after 30 charge/discharge cycles under a current density of 200 mA g1, the mixed
phase a/b-Ni(OH)2 with 10% Al can still deliver a specific discharge capacity of 964 mAh g1, much higher
than of for the a-Ni(OH)2 with 20% Al (681 mAh g1) and the pure Ni(OH)2 (419 mAh g1).