High Temperature Electrochemical Performance of Al-substituted α-Ni(OH)2

doi:10.3724/SP.J.1077.2008.00291

Abstract

Abstract: The purpose of this study was to explore the synthesis of finer Al-substituted Ni(OH)₂ particles by means of homogeneous precipitation method and to investigate its’ micro-morphology, crystal structure, chemical composition and electrochemical performance at high temperature. The results show that a stabilized α-phase is obtained for the experimental substance and the particles are spherical agglomerates of fibrous nanometer scale crystallites. The approximate chemical composition of the product can be described as Ni_0.70Al_0.18(OH)_1.6(CO₃)_0.1(SO₄)_0.07·(H₂O)_0.6. In the experimental MH-Ni batteries, Al-substituted Ni(OH)₂ anode displays high charging efficiency and good cyclic stability with comparatively high oxygen evolution potential at 60℃. Compared with the behavior at 25℃, its discharging capacity at 60℃ is decreased by 15mAh/g. Moreover, after electrochemically cycled at 60℃ for 95 times, the structure of Al-substituted Ni(OH)₂ remains mainly α phase, showing good structural stability.

Key words: Al-substituted Ni(OH)₂, crystal Structure, high temperature electrochemical performance

CLC Number:

O646

LIU Yuan-Gang,TANG Zhi-Yuan,XU Qiang,LI Chang-Sheng. High Temperature Electrochemical Performance of Al-substituted α-Ni(OH)₂[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00291.

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High Temperature Electrochemical Performance of Al-substituted α-Ni(OH)₂

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