(天津大学化工学院, 天津 300072)
摘 要: 将沉淀转化法和无水乙醇法相结合， 制备出绿色球形Ni(OH)2粉末。 利用扫描电镜、X射线衍射仪及充电电池测试装置， 对Ni(OH)2粉末的表面形貌、 相结构和充放电性能进行了表征。 扫描电镜形貌分析表明Ni(OH)2晶粒存在一定程度的微团聚， 颗粒尺寸介于3～6 μm之间， 小于生产用氢氧化镍的8～12 μm； X射线衍射结果表明Ni(OH)2的衍射峰强度降低、 半高宽(FWHM)增大， 晶型结构为β型； 将该Ni(OH)2颗粒按3％（质量分数）与生产用氢氧化镍混合掺杂， 所制备的混合颗粒Ni(OH)2正极的充电电位降低、 放电电位升高， Ni(OH)2的平均比容量提高约20 mA·h/g。
关键字: β型氢氧化镍； 颗粒尺寸； 充放电电位
（School of Chemical Engineering and Technology, Tianjin University,
Tianjin 300072, China）
Abstract: By combining precipitation conversion method and anhydrous ethanol method, a kind of green spherical Ni(OH)2 powder was prepared. With the help of Cambridge S360 scanning electronic microscope, Philips APD-10 X-ray diffraction apparatus and BS-9380 secondary battery performance and life test device, the surface morphology, phase structure and charge-discharge performance of experimental Ni(OH)2 powders were characterized. The results show that the particle size of experimental Ni(OH)2 is 3-6 μm, smaller than that of the employed production-line Ni(OH)2 (8-12 μm). SEM analysis exhibits that some crystal grains of experimental Ni(OH)2 powders agglomerate to grow up to larger ones. XRD spectrum indicates that its crystal structure is β type with lower diffraction intensity and higher full width of half maximum intensity (FWHM). When experimental Ni(OH)2 was intermingled with employed production-line nickel hydroxide at a mass ratio of 3%, the mixed positive electrode displays a lower charge potential and higher discharge potential as well as an increase of 20mA·h/g in gravimetric capacity.
Key words: β-Ni(OH)2; particle size; charge and discharge potential
