球形Ni(OH)2的微结构和热分解特性与电化学性能的关系

来源期刊:中南大学学报(自然科学版)2005年第4期

论文作者:彭美勋 沈湘黔 王零森

文章页码:539 - 544

关键词:Ni(OH)2;微结构;热分解;电化学性能

Key words:Ni(OH)2; microstructures; thermal decomposition; electrochemical performance

摘    要:应用统计方法,利用电子显微镜、X射线衍射仪、热重/量热分析和恒电流充放电测试手段研究了球形Ni(OH)2的形貌、结构和热分解性与电化学性能的关系。研究结果表明:随着球形Ni(OH)2表面微晶从结晶良好的粗粒片状到结晶不好的细粒状变化,其以放电容量表示的电化学性能总体上降低。样品的放电比容量与(001)面XRD的半高宽及(100)面的半高宽明显负相关,而与(001)面间距d001及(101)面的半高宽的正相关性不强,与其热分解失水量负相关,与其热分解温度正相关;球形Ni(OH)2的放电容量随其结晶性与单晶粒度的增大而提高。附件: Z2005-04-02

Abstract: Scanning electron microscopy, X-ray diffraction, thermogravimetric analysis/differential scanning calorimetry and galvanostatic charge and discharge technologies were used to study microstructures and thermal decomposition characteristics of spherical Ni(OH)2and their effects on the electrochemical performance using statistical method. The results show that as the surface morphology of spherical Ni(OH)2 changes from large layer-like to small grain-like, the electrochemical performance characterized with discharge capacity generally decreases. There are trivial positive relativity of the discharge capacity tod001(distance of planes (001)) and FWHM101(XRD full width of half maximum of plane (001)), and obvious positive relativity of the discharge capacity to FWHM100and FWHM001. There is an obvious negative relativity of the discharge capacity to water content and a positive relativity to decomposition temperature for spherical Ni(OH)2. The discharge capacity generally increases with the increase of crystallization extent and the crystal size

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