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无机材料学报

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Al含量对α-Ni(OH)2结构及其电化学性能的影响

肖慧明1; 王建明2   

  1. 1. 浙江科技学院, 杭州 310012; 2. 浙江大学化学系 杭州 310027
  • 收稿日期:2003-04-24 修回日期:2003-06-05 出版日期:2004-05-20 网络出版日期:2004-05-20

Influence of Al Content on the Structure and Electrochemical Performance of Al-substituted α-Ni(OH)2

XIAO Hui-Ming1; WANG Jian-Ming2   

  1. 1. Zhejiang University of Science and Technology; Hangzhou 310012; China; 2. Chemistry Department; Zhejiang University; Hangzhou 310027; China
  • Received:2003-04-24 Revised:2003-06-05 Published:2004-05-20 Online:2004-05-20

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摘要： 采用有机溶剂体系中的化学共沉淀法,制备了纳米尺度的、具有高电化学活性的Al取代α-Ni(OH)2,并用XRD和FTIR光谱表征了它们的结构;通过考察样品在强碱性介质中的结构稳定性,探讨了Al含量对α-Ni(OH)2结构及电化学性能的影响。结果表明:当Al含量为7.5％、13.2％和17.2％时,样品的晶粒度分别为5.4、6.9和11.0nm。Al含量为7.5％的样品为α-Ni(OH)2和β-Ni(OH)2的混合结构,而Al含量为13.2％和17.2％的样品则为纯α-Ni(OH)2的单相结构。随着Al含量的增加,样品的结晶度增大,因而其稳定性增加,放电中点电位升高,电化学容量增大.

关键词: Al取代α-Ni（OH）2, 结构表征, 结晶度, 电化学性能

Abstract: Nano-sized Al-substituted α-Ni(OH)2 with high electrochemical performance was synthesized
through a chemical co-precipitation method in organic solvent and characterized by means of X-ray diffraction and infrared spectroscopy.
Sample’s structure stability in concentrated alkaline solution was investigated and the relationship between structure and electrochemical performance was studied. The experimental results show that the mean
crystal sizes of samples containing 7.5%,13.2%and 17.2%(molar ratio)Al are 5.4, 6.9 and 11.0 nm respectively. The structure of the sample with 7.5% Al is of
the mixture of α-Ni(OH)2 and β-Ni(OH)2, whereas the structurers of the samples respectively with 13.2% and 17.2% Al are of pure α-Ni(OH)2.
Structure stability increases with Al content increasing due to gradually increased crystallinity and so do its discharge mediate potential and
specific electrochemical capacity.

Key words: Al-substituted α-Ni（OH）2, structure characterization, crystallinity, electrochemicalperformance

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