β-NiOOH的臭氧氧化法合成、表征及电化学性能

利用臭氧在常温下氧化球形β-Ni(OH)2,制得β-NiOOH。通过X射线衍射、光电子能谱分析、扫描电镜等对样品结构进行表征。采用循环伏安及恒流放电实验研究所制β-NiOOH样品的电化学性能。结果表明:样品主要成分是平均粒径为13μm的球形β-NiOOH颗粒,不含γ-NiOOH。在样品以0.5C的放电倍率放电至0.5 V时,其放电比容量为200.4 mA·h/g,并具有较平坦的放电曲线。采用本方法所制样品的电极可逆性优于采用其他方法制备的β-NiOOH的可逆性,且未额外引入杂质元素,是一种制备纯净NiOOH的方法。

Synthesis,characterization and electrochemical properties of β-NiOOH by ozonation process

β-NiOOH was synthesized by using ozone to oxidaze spherical β-Ni(OH)2 at room temperature.The X-ray power diffraction(XRD),X-ray photo electronic spectrum(XPS) and scanning electron microscope(SEM) were used to characterize the structure of the sample.The electrochemical performance of the β-NiOOH samples was studied by cyclic voltammetry and constant-current discharge test.The results show that the sample is spherical β-NiOOH with diameter of 13 μm and does not contain γ-NiOOH.The largest discharge capacity of β-NiOOH samples is 200.4 mA·h/g when the samples are discharged to 0.5 V at a rate of 0.5C,and have a flatter discharge curves.Moreover,the β-NiOOH sample synthesized with this method has a better reversibility than those synthesized by other methods and contains no extra impurities.So,it is a better way of preparing pure NiOOH.