温度及搅拌速度对纳米氢氧化镍性能的影响  

Effect of Temperature and Stirring Speed on Performance of Nano-Ni(OH)_2

作　　者：李强[1] 朱燕娟[1] 张仲举[1] 黄亮国[1] 包杰[1] 

机构地区：[1]广东工业大学物理与光电工程学院,广州510006

出　　处：《人工晶体学报》2010年第3期751-756,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(No.10774030);广州市科技计划资助项目(No.2008J1-C161)

摘　　要：采用化学沉淀法制备出片状和棒状混合的纳米β-Ni(OH)2。将纳米粉体以8%比例掺入到球镍中制成复合电极,研究了反应温度和搅拌速度对纳米粉体结构、形貌及其复合电极电化学性能的影响。结果表明:反应温度升高,纳米颗粒粒径增大;搅拌速度提高,粒径减小;复合电极的放电比容量随反应温度和搅拌速度提高先增大后减小,当反应温度为50℃、搅拌速度为500r/min时,相应的复合电极放电比容量最大,达到了263.3mAh/g,比纯球镍电极放电比容量(239.4mAh/g)提高了约10%。研究还显示,复合电极的放电比容量与其粉体的压实密度有直接关系,其放电比容量和放电平台均高于纯球镍电极。The nano-sized β-Ni（OH）2 powder with nano-flakes and nanorod were prepared by chemical precipitation method.The nano-sized powder was added into micron-scale spheroshape Ni（OH）2 at a ratio of 8% to get a composite electrode.Effects of reaction temperature and stirring speed on the morphology and structure of the powder and the electrochemical performance of composite electrode were investigated.The results indicate that the nano-particles size increased as the reaction temperature increasing and the particles size reduced as the stirring speed increasing.The discharged specific capability of the composite electrode increased at first,then decreased as the reaction temperature and stirring speed increasing.The maximum value （263.3 mAh/g） was obtained when reaction temperature was 50 ℃ and stirring speed was 500 r/min.It was about 10% higher than that of the pure spheroshape Ni（OH）2（239.4 mAh/g）.The study also show that there was direct corresponding relationships between the discharge specific capacity of composite electrode and the pressing density of composite powders.The discharge specific capacity and discharge voltage were higher than that of the pure spheroshape Ni（OH）2.

关 键 词：纳米氢氧化镍 反应温度 搅拌速度 化学沉淀法 电化学性能 

分 类 号：Q646[生物学—生物物理学] TQ174[化学工程—陶瓷工业]