Synthesis and behavior of Al-stabilized α-Ni(OH)2

来源期刊:中国有色金属学报(英文版)2009年第1期

论文作者:王虹 唐致远 刘元刚 李昌盛

文章页码:170 - 175

Key words:urea thermal decomposition; Al-stabilized α-Ni(OH)2; electrochemical performance

Abstract: Nano-fibrous Al-stabilized α-Ni(OH)2 was synthesized by the urea thermal decomposition method. The grain morphology, crystal structure, thermal stability, chemical composition and electrochemical performance of the Al-stabilized α-Ni(OH)2 were investigated. It is found that the urea thermal decomposition is an appropriate way to precipitate the Al-stabilized α-Ni(OH)2 with excellent performance. The fiber cluster TEM pattern shows that the synthesized α-Ni(OH)2 powder is composed of agglomerates of much smaller primary particles. The stabilized α-Ni(OH)2 powder with a 7.67 A c-axis distance and low thermal stabilities is obtained. The FTIR spectrum shows that the materials contain absorbed water molecules, and intercalated CO32- and SO42- anions. The experimental α-Ni(OH)2 electrode exhibits excellent electrochemical redox reversibility, high special capacity, good rate discharging performance and perfect cyclic stability. Moreover, the synthesized α-Ni(OH)2 electrode also shows high discharge capacity and cyclic stability at high temperature. The electrode specific capacity remains 290 mA·h/g at 60 ℃, which is only 15 mA·h/g lower than its ambient value, and the capacity loss is 0.9 mA·h/g per charge-discharge cycle.

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