(天津大學化工學院, 天津 300072)
摘 要: 將沉淀轉(zhuǎn)化法和無水乙醇法相結(jié)合， 制備出綠色球形Ni(OH)2粉末。 利用掃描電鏡、X射線衍射儀及充電電池測試裝置， 對Ni(OH)2粉末的表面形貌、 相結(jié)構(gòu)和充放電性能進行了表征。 掃描電鏡形貌分析表明Ni(OH)2晶粒存在一定程度的微團聚， 顆粒尺寸介于3～6 μm之間， 小于生產(chǎn)用氫氧化鎳的8～12 μm； X射線衍射結(jié)果表明Ni(OH)2的衍射峰強度降低、 半高寬(FWHM)增大， 晶型結(jié)構(gòu)為β型； 將該Ni(OH)2顆粒按3％（質(zhì)量分數(shù)）與生產(chǎn)用氫氧化鎳混合摻雜， 所制備的混合顆粒Ni(OH)2正極的充電電位降低、 放電電位升高， Ni(OH)2的平均比容量提高約20 mA·h/g。
關(guān)鍵字: β型氫氧化鎳； 顆粒尺寸； 充放電電位
（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
