Hydrothermal Modification and Characterization of Ni(OH)2 with High Discharge Capability

The influence of hydrothermal treatment on the crystallinity and discharge capability of Al-substituted α-Ni(OH) 2 was discussed in this paper. α-Ni(OH) 2 with 15% Al substitution prepared at room temperature was converted to a mixture of β-Ni(OH) 2 and α-Ni(OH) 2 after treatment in alkaline solution at 140 °C for 1.0 h, leading to increase of the tap density and the discharge capacity owing to improvement of the crystallinity, increase of the interlayer distance, and occurrence of more proton vacancies.